Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPS53138301 Description or title of the invention Generation method of 4-channel stereophonic sound signal The two-channel stereophonic sound recording / reproduction method has been put to practical use, in which two-channel stereophonic sound reproduction is performed using two reproduction sound sources (speakers) arranged at predetermined intervals. EndPage: 20 years after 20 years already! Also, it has been a long time since the so-called CD-4 system 4 channel stereophonic sound recording and reproduction system developed by the applicant company and other 4 channel stereophonic sound reproduction systems were put into practical use Is well known as σ), but a standard for the arrangement of four speakers has not yet been established with regard to three-dimensional sound reproduction of four channels, and the program source for which program creators are making is the object of production The fact is that program sources are being produced on the assumption that speakers are placed in such a way that their intended 4channel reproduction effect can be best exhibited in relation to the type and content of the program. Each of FIGS. 1 (a) to 1 (el) is representative of an arrangement of four loudspeaker arrangements to 84 conventionally attempted in various 4-channel stereophonic sound reproduction systems. It is explanatory drawing which illustrated sidetones of things, Comprising: The code ¦ symbol M in each figure shows a listener. 1 (a) and 4 ('b) show the arrangement of the speakers arranged in front of the listener M in four speakers S.about.84 (generally abbreviated as 4-.smallcircle. 1 (e) and 4 (d) show that two speakers S are arranged in front of the listener M and the side of the listener y or the side of the listener y It is a speaker arrangement (generally abbreviated as 2, 2 FT) of the form where two speakers 63I 84 are arranged in front of the side (Fig. 1 111 (Fig. 1111 shows two each in front and back of listener M) The speaker arrangement (generally abbreviated as 2-2SD) of the type in which the speakers Blr 82 * 83 s 84 are arranged 09-05-2019 1 is shown. By the way, conventionally, in various 4-channel stereophonic sound systems, a signal 'f: used for 2 channel stereophonic sound reproduction is given to a 2-channel stereophonic sound reproduction device to thereby perform 2-channel stereophonic sound reproduction. Also, consideration is often given to the signal form so that it can be used at the time of 2-channel stereophonic sound reproduction without any loss of information content contained in 4-channel stereophonic signals. A signal in the form of the sum of two sets of two predetermined twochannel signals in the four-channel stereophonic sound signal is provided by the two-channel stereophonic sound reproducing apparatus. An example thereof is to be used for two-channel stereophonic sound reproduction. Even if twochannel stereophonic sound reproduction is performed by the two-channel stereophonic sound reproduction device without causing any loss of information content in the four-channel stereophonic sound signal as described above, the two-channel stereograms The mode of localization of the sound image obtained by sound reproduction is completely different from that intended by the producer of the program source for 4-channel stereophonic sound reproduction in preparation for the program source, and it has been said conventionally The four channel stereophonic sound-compatible with the two-channel stereophonic sound reproduction that has just come to such an expression, focusing only on the point that there is no loss in the signal content. However, with regard to the aspect of the localization of the sound image etc., there is no compatibility except in special cases. The following is a specific example of this point. That is, for example, FIG. 1 (FIG. 1) shows an example of the arrangement of four speakers used for producing a 4-channel channel stereo sound by the producer of the 4-channel channel stereo sound reproduction program source. d) With the 2-2FT speaker arrangement as illustrated in mind, the listener M in the 4-channel stereophonic sound reproduction moves from the left side to the front left side and the front right side to the right side In the case where a 4-channel stereophonic sound signal is configured to receive a sound image and this 4-channel stereophonic sound signal is provided to a 2-channel stereophonic sound reproduction apparatus, the 4-channel stereophonic sound signal is A signal in the form of the sum of the left side channel signal and the left front channel signal 'is supplied to the left front speaker in the two-channel stereophonic sound reproducing apparatus. A signal in the form of the sum of the right front channel signal and the right side channel signal in the 4-channel stereophonic sound signal is supplied to the right front speaker in the 2-channel stereophonic sound reproducing apparatus to reproduce the 2-channel stereophonic sound. EndPage: The movement of the sound image perceived by the listener who is reproducing the program source for four-channel stereophonic sound reproduction described above by means of EndPage: 32 channel stereophonic sound is stopped for a while at the position of the left front speaker. The sound image was moving at position 1 on the right front of the speaker and stopped there for a while. This is completely different from the sound image movement mode as described above intended by the creator of the program source. 09-05-2019 2 As described above, the four-channel stereophonic signal that is conventionally considered to be compatible with two-channel stereophonic sound reproduction lacks the compatibility regarding sound image localization, and this point is a four-channel stereophonic program source. In addition to being a major cause of difficulties in the production of program sources for the creators of this project, there is also one problem in the implementation of 4-channel stereophonic sound broadcasting that is being planned recently. It is being discussed. The present invention is a sound image localization in a method based on the recognition mechanism of sound image localization of human beings, that is, basically the condition when the listener is listening to the sound from the real sound source according to the concept of pinaural. Solves the above-mentioned problems by generating a 4-channel stereo acoustic signal that can be given to the both ears of a listener who is performing 2-channel stereo sound reproduction by a 2channel stereo sound reproduction device using a 2-channel stereo sound reproduction device. Hereinafter, the contents will be specifically described with reference to the attached drawings. First, a recipient who has a normal hearing hears the direction of a sound source (real sound source) that is present at a specific position (direction) in space, the difference in the signal level of the sound signal (both-ears signal) given to both ears Sound pressure difference) or phase difference (time difference), which is given to the left and right ears of the listener by sound waves emitted from a plurality of reproduction sound sources (speakers) The signal level difference and the phase difference (time difference) in the acoustic signal are the signals in the acoustic signal respectively given to the left and right ears of the listener by the sound wave emitted from the real sound source present at a specific position in space. In the case where the level difference and the phase difference (time difference) are exactly the same, the listener who is listening to the sound waves emitted from the plurality of reproduction sound sources is present at a specific position in the above-mentioned space. It emits from the real sound source to The sound level is localized at any spatial position other than the reproduced sound source actually emitting the sound wave, if the signal level difference and the time difference in the binaural signal are appropriately set since it can be perceived as being With regard to the localization of a sound image, it is possible to use a signal having no localization information as an original signal, and from the original signal, a plurality of signals 1ki having different signal levels and phases, according to K When driving a plurality of speakers arranged in a space, a binaural signal given to the listener is the same as a binaural signal to be obtained as an output signal using a pinaural signal generator when a sound source is assumed to be present. Image localization method (Japanese Patent Application Laid-Open No. 50-43002) in which a plurality of the above-mentioned plurality of signals are made so as to obtain a stable signal Japanese Patent Application Sho .DELTA.l-20098), the signal conversion Soryou (Japanese Patent Application No. Sho 51-21313), many other proposals have been made. Then, these sound image localization devices use signals having no localization information (for example, so-called monaural signals, certain h are individual channel signals in multi-channel 09-05-2019 3 stereophonic sound signals, etc.) as input signals for busy, and When the outgoing signal from it is respectively supplied to a plurality of speakers arranged in a predetermined arrangement manner in space, the sound waves emitted from the plurality of speakers are generated in the listener's both ears The listener feels the localization of the sound image as in the case where the sound source corresponding to the input signal is actually present at a specific position (or direction) in the space intended to localize the sound image by the acoustic signal. Sound signal localization configured as being capable of outputting the above-mentioned output signal having signal content that can be As long as it has the function as described above, any configuration may be used depending on the configuration. However, Japanese Patent Application No. 15120098 proposed by the applicant company as this sound image localization apparatus, It is advantageous to use a device to which a technique such as Japanese Patent Application No. 51EndPage: 42 or 3L3 is applied, since the sound image localization apparatus can be configured with a simple configuration. FIG. 2 is a block diagram of an example of the configuration of the sound signal localization apparatus S-O proposed in Japanese Patent Application No. 51-20098 related to the application of the applicant company, and in FIG. It is an input terminal of the signal which does not have information (a monaural signal or individual channel signal of multi channel stereophonic sound signal), and the signal which does not have localization information in the input terminal 1 to the block as an input signal When added. If the sound source day corresponding to the input signal is present at a specific position in the space intended to localize the sound image, then a pinaural signal generator (for example, the position of the left ear and the right ear of the artificial head) Using the structure of individually attached microphones), it is possible to obtain as output signals Ls and Rs from the pinaural signal Le similar to the pinaural signal to be obtained as the output signal, Rsft output terminal 2 lightning 3 The first signal conversion device configured as described above, SX, (a second signal to which the pinaural signal Ls, 'BJa output from the first signal conversion device described above is applied to the input terminal 4.5 The second signal conversion device EIX2 is a conversion device, and the output terminals Lep and Rsp output from the output terminals 6 and 7 are empty so as to form a reproduction sound field. When supplied to a plurality of speakers 8.9 (the case where two speakers are used in FIG. 2 'is illustrated in FIG. 2) disposed in the interior, the listener M may hear through the space from the speakers. Sound signal (Binaural signal) XAgRe given to both ears of the audio signal is in the form of a signal such that crosstalk to be generated in the reproduction sound field has been canceled in advance so as to become the above-mentioned pinaural signal Signal conversion characteristics. Next, the above-described signal conversion characteristics to be included in the first signal conversion device α □ and the second signal conversion device α2 described above will be described. FIG. 3 shows the transfer characteristic Ehx between the sound source B and the listener M when the sound source S is present in the direction of the left front θ degree of the listener M, assuming that the angle M is the front of the listener M. 8f and the listener M's binaural signals Lel and Re ', and the listener M's binaural signal Shi Re' in the case of FIG. , Sn, it 09-05-2019 4 is expressed as the following α) equation. (] = S · [,] ... (1) Re 'The output signal fLs of the first signal conversion device 5XXL. Assuming that Rs, this output signal u, Rs is identical to the listener M [provided with binaural signals Le 'and Re' based on the actual sound source S as shown in FIG. 3 described above, ie, (Ib) In the case of (-), the following equation (2) is established, and the signal conversion characteristic of the first signal conversion circuit SX, which can produce such an output signal, is 1, while the second Output signal 1 bp of the signal conversion device α 2 of In order for the binaural signal Le, Re to be supplied to the listener MK to be supplied to the speaker 8.9 when Rsp is the same as the output signal 'Ls, R8 from the first signal conversion device SX □ described above, It is necessary that the output signals Lap and Rsp in a state in which crosstalk to be generated in the reproduction sound field configured using the speakers 8 and 9 is canceled in advance are individually provided to the speakers 8.9iC. Now, the output signal Ti3p from the second signal converter. The transmission characteristics between the left ear and the right ear of the listener M in the playback sound field formed by the speakers 8 and 9 supplied with Rsp and the speakers 9 and 8 are respectively the left of the listener M through the speaker 8 With the ear 1 ... a through the speaker 9 with the right ear 1 of the listener M ... through the speaker 8 with the right ear 1 of the listener M ... b through the speaker 9 with the left ear 1 of the listener M Assuming that the transmission characteristic A of the reproduction sound field described above is expressed as A = (a) (3) above (3), both of the transmission characteristics are given to the listener M. The ear signals Le and Re and the output signal Tpp of the second signal conversion device BX2 supplied to the speakers 8 and 9. There is the following relationship with Rsp. (R,) = A (尊) ··· (4) However, binaural signals Le and Re 4 f equal to the output signals LEI and Rs to the first signal conversion device, and the listener M in the reproduction sound field In order to give both ears, the output signal J1, ep, Rsp from the second signal EndPage: 5 converter needs to be made as shown by the following equation (5). cLsp) == T, Al (ゝ) (5) 5pRfl (where T is a delay) Thus, the above sound image localization apparatus intends an input signal not including localization information, Noinal signal r representing a sound image localized in an arbitrary direction. A plurality of binaural signals 1e and Re having the same signal form as the four signal signals Ls and Rs produced by the first signal conversion device f3X1 for equal conversion and the first signal conversion device SX1 described above are plural This signal is given to the speaker by modifying the signal line Ls, RfIf so as to cancel the crosstalk occurring in the reproduction sound field in advance so as to be given to the listener in the reproduction sound field formed by using the speakers Since the second signal conversion device SX2 for producing the signals Lsp and Rsp is connected in cascade, each signal conversion device can be easily configured by a simple filter, a delay circuit, a calo calculator, etc. Conversion can be performed at once through the entire frequency band that is the target of signal conversion, so if the output signal to the fidelity signal conversion device is given to headphones and listened with a simple configuration, PINO When you are Lal reproducing b Migihitsuji advantage is the also obtained. And, as already stated, it is the first signal conversion device, and in the example shown in the figure, the physical properties Sn, Sf 09-05-2019 5 between the real sound source S and the listener M's ears are referred to (see FIG. 3). . The transfer characteristic 8 n represents the transfer characteristic between the sound source S and the ear closer to the sound source S in the listener M, and the transfer characteristic S f is far from the sound source S and the sound source S in the listener M Of the circuit 10 having the same characteristics 8n'l as the transfer characteristic an) and the characteristics of the ratio of the transfer characteristics 8n and Sf, that is, the difference physical property between the two ears in It is constituted by the n circuit 11 provided. The circuit 10 described above is configured by a filter as a circuit whose frequency response characteristic changes in accordance with θ to be set, and the circuit 1m described above also has frequency response characteristics and frequency versus time difference characteristics in accordance with θ to be set As a circuit which changes in, it is comprised by combination of a filter and a delay circuit. The input signal not having localization information supplied to the input terminal l passes through the circuit 10 having a 5 n Ivf property in the first signal conversion device 85, and the output terminal 2 heno (one ear signal of the The output of the circuit lO described above is output as the left ear signal L8 in the illustrated example, and the output of the circuit lO described above passes through the circuit 11 having 4 characteristics n to the output terminal 3 / the inoural signal And the other ear signal (shown as a right ear signal in the illustrated case). The above two signals Rs output to the output terminal 23 of the above-described first signal conversion device 8X are, for the existing sound source S, a pinaural signal obtained when using a pinaural signal generator and It is the same, and if the headphone is connected to the terminal 2.3 and it listens, stereo reproduction by a pinaural signal can be performed. The output signals' m, Rs from the first signal conversion device described above are applied to the input terminal number 5 of the second signal conversion device EIX2. M2 signal converter 8x2Il'i, as already described, its output terminals 6. When the output signals Lep and Rsp from '7 are respectively supplied to the individual speakers to form a reproduced sound field, the binaural signals Le and Re to be supplied to the listener M in the reproduced sound are the second mentioned above. An output signal L8p of a signal form in which crosstalk generated in the reproduction sound field is eliminated in advance so that input signals r and Rθ of the signal conversion device SX2 have the same signal form as the input signal r and Rθ. A signal conversion device capable of converting to Np, that is, has characteristics as indicated by T-A in the above-mentioned equation (5). The following equation is obtained by rewriting equation (5) showing the relationship between the input and output signals of the second signal conversion unit & SX2. EndPage: 6 The second signal conversion device SX2 shown in the example shown in the figure is constructed by specifically circuitizing the equations (5a) and (5b) described above, and 12a and 12b are buffers. The amplifiers 13a and 14a and 131) and 141) are circuits configured to havecharacteristics by respective ones or by a filter and a delay circuit, 15a and 15b are inverters, 6 at 16 b Ia adders, 17 a and 1 l. '7tln each one by filter and delay circuit. Using the signal Is, Rs applied to the input terminals 4, 5, the output signal Lsp of the required signal form. It is converted to Rsp. The second signal conversion device 8x2 is not limited to the configuration as 09-05-2019 6 shown in the example shown in the drawing, and, for example, even if all the ones as shown in Japanese Patent Application No. 50-'75209 are used. Good. The sound image localization apparatus of the second illustration shown above has the output terminal 6. of the second signal conversion device Sx2. If an output signal of 2-channel system is obtained from F, and the output signal is given to a speaker arranged so that a 2-channel stereo sound field can be released, both channels of listener M can be obtained by 2-channel system. It can give a signal. FIG. 4 is a fourchannel stereophonic sound signal of the present invention, and in this FIG. 4, 2ON 23 is each channel signal LF, RF in the original four-channel stereophonic sound signal. The input terminals of the IIB 9 RB, and the housings 24 to 27 are the output terminals of the modified 4-channel signal 騙, R−1 □, R main, and are originals individually input to the abovedescribed input terminal buttons 昂Each channel signal of the four-channel stereophonic sound signal, such as RF, IJB, and RB, is individually provided with sound image localization circuits 8IO □, S02. S Engineering 03. It is individually applied to each input terminal 1'1'1021103I "04 in S04. Each sound image localization circuit 8 described above may be configured according to the construction principle described with reference to FIG. 2 described above, for example. The input terminals 1 ° □ to 104 and the output terminals 6 ° 1 to 6 ° 7 ° □ 0 to 04 in each of the sound image localization circuits 8 in 0 □ to S 4 in FIG. The suffixes 01 to 04 are added to input terminals and output terminals corresponding to the input terminal l and the output terminal 6.7 at 0, and they are symbols represented so that the correspondence relationship becomes clear. The signal gift 19% 1 individually output from the output terminal 6 ° P 2 O 3 in the above sound image localization circuit S O O 11 town 02 is added by the adders ADD, P and output to the output terminal U in the modified 4-channel stereo acoustic signal The signal 栴 + Rw, which is output as the 禄 channel signal − and is individually output from the sound image localization circuit EEIIO 95 I 02 K output terminal 701 + 702, is added by the adder ADD rf and is added to the output terminal 26. It is output as an Rp channel signal RFh in a stereophonic sound signal. In addition, the signals LB1 individually output from the output terminals 6 ° 3 and 6 4 in the sound image localization circuit 8 and the steps 3 and 4 04, respectively. Bll is added by the adder ADD1 or the like, and output to the output terminal 26 as a rice channel signal に お け る in the modified four-channel stereophonic sound signal, and the signal localization circuit S. 03. RBr individually output from the output terminal +7 CB ′ 704 in S 04 is added to the adder node by 1 and output to the output terminal 27 as the RB channel signal I lb in the modified 4channel stereo acoustic signal . Thus, transmission of a known 4-channel signal to each channel signal of the modified 4-channel stereo acoustic signal individually output from the output terminals 24 to 27 to the 4-channel stereo acoustic signal transformer The signal is transmitted or recorded / reproduced through a system or a recording / reproducing system, and used as a signal for 4-channel stereophonic sound reproduction or used as a signal for 2-channel stereophonic sound reproduction. 09-05-2019 7 In FIG. 4, modified four-channel stereophonic signals individually output from the output terminals 24 to 21y of the four-channel stereophonic signal transforming device FX are divided into two sets of sum signals -1 in the mad v-lux circuit MX. And the difference EndPage: 7 signals Ldl−. And the sum of the above two sets! The difference signals have signal configurations as shown in the following equations (6) to (9), respectively. -One employment eleven ... (6)% = "pa" R 扼 ... (-1) Multiple = 嘔-騙 ... (8) "a = Rya-R ca ..., (9) Two sets of sum / difference signals shown in the above equations (6) to (9), ie, two sets of sum signals -9 and two sets of difference signals -9etc. Although transmission, recording and reproduction are performed by the system, R selfrecording reproduction system, an embodiment of the transmission, recording and reproduction may be appropriately selected and used among known means. For example, when the above four sum and difference signals are intended to be recorded and reproduced by the disk record, the four sum and difference signals may be recorded while being compressed according to the socalled CD 鴫 method developed by the applicant company. Well, when transmitting by broadcast waves, for example, it may be broadcasted according to a so-called 4-channel stereophonic sound system known as the so-called Darren system. Note that the generated 4-channel stereophonic sound signal is transmitted, In the case of recording and reproduction, the sum of signal configurations as shown in the above-mentioned equations (6) to (9). It is not required to be converted into a signal, that is to say, when a 4-channel stereophonic sound signal is reproduced by a 2-channel stereophonic sound reproduction device, the signal supplied to the 2-channel stereophonic sound reproduction device is It may be in the form of two sets of sum signals, for example, each channel signal -t "BatRFa'R" in a modified four-channel stereophonic signal adjacent track on a magnetic tape or other recording medium Even if it has been made to record two sets of sum signals in the form of (IjFa "%) # (" z "'Bl) at the time of reproduction, it is sufficient. In FIG. 4, a partial US shown in the right side of the figure shows that the two sum signals -1Ra by the modified four-channel stereophonic signal obtained by the No. channel stereophonic sound signal generation method of the present invention are two-channel stereophonic playback device. When given as one input signal, what localization of sound image can be given to a listener M who is at a predetermined place with respect to two speakers 8.9 and faces a predetermined direction? The sum signal 、, and the range of localization of the sound image that can be given to the listener M by the sum signal 飄 will be described below. In FIG. 4, a sum signal having a signal configuration like the equation (6) given to the input terminal 18 in the two-channel stereophonic sound reproducing apparatus is amplified by the amplifier Masuda and then supplied to the speaker 8. The sum signal 有 す る having a signal configuration as shown in the equation (7) given to the input terminal 19 is supplied to the speaker 9 after being amplified by the amplifier 29. The 4-channel stereo [9-channel equalchannel signal layer and the RF channel signal RFa output from the output terminal 4.25 in the 4-channel stereo-acoustic signal transformer FX are the original 4 channels supplied to the input terminal 20. Equal channel signal layer of stereophonic sound signal and RF channel signal R, etc., sound image localization circuit EI 工 0 □. 13I02. The position of the sound image 09-05-2019 8 formed by the above-described signal%-% being supplied to the speakers 8 and 9 is the abovementioned sound-. According to the setting method of the signal conversion characteristic of the image localization circuit B-O-B-B-O 02, a range of about 180'ji at the one-side near the one side of the listener M to the one-side near the other side of the listener M It can be made at any intended position within. In addition, one channel signal 楡 of the modified four-channel stereo acoustic signal and the RB channel signal RBa output from the output terminal 26.2'7 in the fourchannel stereo acoustic signal transformer Fx are supplied to the input terminal 22.23.顯 channel signal of the original 4-channel stereophonic sound signal and city channel signal RB are modified by circuits such as sound signal localization circuits S-C03 and S-C04, and adders ˜ b, Ar5rv and b, The position of the sound image formed by supplying the above-mentioned signal − ′ ′ lh to the speaker 8.9 depends on the setting method of the signal conversion physical property of the sound image localization circuit 5IO 3 ° 6 04 mentioned above, the listener M It is possible to have an intended EndPage: 8 within the approximate range of about X8 in the category of about 1 from just beside one side of the side to the just beside side of the other side of the listener M. Therefore, in the case where the program source based on the original fourchannel three-dimensional audio signal is produced on the assumption of 4-0 format or 2-2FT format as an arrangement of four speakers at the time of reproduction, By setting the signal conversion characteristics of each sound image localization circuit in the 4-channel stereophonic sound signal transformation apparatus FX, localization of the sound image as intended by the creator of the program source as obtained by using four speakers is% 22 channel sound It can also be perceived by the listener who uses the playback device, and a program source based on the original four-channel stereophonic sound signal is produced on the assumption that the arrangement of four speakers at the time of playback is the 2 + 28D format. Even if the fourchannel three-dimensional acoustic signal deformation device FX Aspect of sound image localization by a program source produced assuming four loudspeakers of 2-2SD format by setting of signal conversion characteristics of the image localization circuit Sound image by four loudspeakers of 2-2FT format Sound localization as if the four signals were localized at each apex angle of the area of the quadrangular shape arbitrarily set forward of the listener, as in the localization mode of As a mode, the listener can be made to sense. Thus, the 4-channel stereophonic sound signal obtained by the 4-channel stereophonic sound signal generation method of the present invention is a signal in the form of the sum of two predetermined two successive channel signals in it. With respect to the two speakers in the twochannel stereophonic sound reproducing apparatus when supplied as a two-channel signal to the standing sound reproducer, to the listener pointing in a predetermined direction at a predetermined position in the original four-channel stereophonic signal The sound images corresponding to the respective channel signals can be heard as being localized at different positions, and according to the non-invention method, all the problems described above are well resolved. It should be noted that each channel signal of the four-channel stereophonic sound signal generated by the method of the present invention is required in space by an arrangement 09-05-2019 9 mode adapted to four-channel stereophonic sound reproduction by the original channel stereophonic sound signal. When four-channel stereophonic sound reproduction is performed by supplying to four speakers arranged in the above, the localization of the sound signal corresponding to each channel signal is slightly shifted from the position of each speaker. The state of three-dimensional sound reproduction is not significantly deteriorated, and the conventional four-channel three-dimensional sound reproduction apparatus can perform fourchannel three-dimensional sound reproduction without any difficulty. FIG. 5 shows that the sound image corresponding to the signal of channel + Rp in the original 4-channel stereophonic sound signal is localized at the positions of the two speakers 8 and 9 in the 2-channel stereophonic sound reproducing apparatus. This is an example of a case where sound images corresponding to the signals of the other two channel rice and RB in the original four-channel stereophonic sound signal are localized outside the two speakers 8.9, respectively. FIG. 6 shows that in the positions of the two speakers 8 and 9 in the two-channel stereophonic sound reproducing apparatus, one channel in the four-channel stereophonic sound signal and signals corresponding to the stationary channel are localized, respectively. The other two channels in the four-channel stereophonic sound signal etc. = signal and the corresponding signal are between the two speakers 8, 90 respectively In a position which is an example of a case that is adapted to be localized, respectively. As described above, in the case where sound images corresponding to specific channel signals are localized to the positions of the two VCs 3 and 8 at the time of 2channel stereophonic sound reproduction, the above-described in the 4-channel stereophonic sound signal transformation circuit FX is performed. Each sound image localization circuit to be provided corresponding to each specific individual channel signal is significantly simplified in its configuration, and no adder is required, as shown in FIGS. 5 and 6. If it is 9, it is not good. That is, in FIG. , The sound localization circuit S O □ given to the input terminal l. A very simple configuration, in which the connection between the output terminal 6 ° and the output terminal 6 is made by a conductive EndPage: 9 line (the output terminal 7 ° is not connected to the circuit and is in a non-signal state) The sound image localization circuit S 02 02 02 where the RF channel signal R 2 is given to the input terminal 1 2 2 is also its input terminal l. (2) and the output terminal 7 ° 2 are connected by a conductor only (output terminal MA. Circuits are not connected to □ and no signal is provided), and the adders ADD,..., ADD, f are omitted. Similarly, the sound image localization circuit S in FIG. As for the S 04, they have an extremely simple configuration in which the input terminal 1 3 and the output terminal 603 are connected by a conducting wire (in the case of the sound image localization circuit 8 9 03), and the input terminal l . It has a very simple construction (in the case of the sound image localization circuit 8 or 04) in which only the connection between the terminal 4 and the output terminal +704 can be made by a conductor (in the case of the sound image localization circuit 8), and the adders M5D1ADD, ADD, わ are omitted. Further, in the above-described four-channel three-dimensional sound signal deforming device Fx of the sixth illustration, the equal channel in the original fourchannel three-dimensional sound signal is realized by the circuit such as the sound image 09-05-2019 10 localization circuit S.sub.011S. Signal conversion is performed so that sound images respectively corresponding to the signal portion and the channel signal RF are localized at different positions between the two speakers 8 and 9 in the two-channel stereophonic sound reproducing apparatus. However, as described above, as a sound localization circuit for localizing a sound image between two speakers, a simple configuration in which only in-phase crosstalk is simply provided is sufficiently practical. In the example shown in FIG. 7, the rice o ′ ′ B channel signal in the original 4-channel stereo acoustic signal is moved to a position slightly outside the position of the two speakers 8 and 9 in the 2-channel stereo sound reproducing apparatus. In the case where the corresponding sound image is localized respectively, and the sound image corresponding to the signal of the IIF of the original 4-channel stereo acoustic signal and the RF channel is localized at different positions between the two speakers 8t9. Indicates In general, when a sound image is produced by processing a virtual image outside the position of one speaker, the more the difference between the position of the sound image and the position of the speaker, the more the difference signal component. When the listener moves his head in the hall, topological discomfort increases. Therefore, in order to reduce such unpleasantness, each different sound image is localized at a position slightly outside the position of the two speakers, and each position of the two speakers is In the case where the sound images are localized, the distances between the positions at which the four sound images are localized become unequal, so the sound images intended to move at a constant speed are also unequal speeds. There is a problem that it is expressed as a moving sound image. However, as in the example shown in FIG. 7, when the four signals corresponding to each channel signal in the original four-channel stereophonic sound signal are localized, it is apparent that the above-mentioned problems do not occur. In such a point, it is meaningful to use the aspect of sound image localization shown in FIG. In addition, as a sound image localization circuit for localizing the sound image to the position slightly outward of the speaker, a simple configuration having a simple reverse phase crosstalk can be used. The sound image localization circuit used in the practice of the present invention is, for example, one in which the distance at the position 1 at which the sound image is localized is also variable as shown in, for example, Japanese Patent Application No. 51-27313. It may be. In the description above, the movement of the sound image in two-channel stereophonic sound reproduction by the twochannel stereophonic sound reproduction device is perceived as listener pressure as-→) → → → RB, RB-+ RF → job →- In the case described above, if the movement of the message is to the listener, the order is → 顯 → RB-+ RF, RF-+ RB-+ T. → You may set the constant of the sound image localization circuit so that it will be in such a state, if you want it to feel like 坏. As is apparent from the details described above, the four-channel stereophonic signal generation method of the present invention is in the form of a signal of the sum of two sets of predetermined two successive channel signals in a four-channel stereophonic signal. A listener who faces a predetermined direction at a predetermined position as a four-channel stereophonic signal EndPage: 10 to be used listens to the sound waves emitted from the two reproduction 09-05-2019 11 sound sources. A sound image localization circuit is provided for each channel signal in the original four-channel stereophonic signal so that the sound image corresponding to each channel signal in the original four-channel stereophonic signal can be heard as localized at different positions. Because it is the one that has been subjected to signal modification and elimination, the 4-channel stereophonic sound signal according to 1 non-invention system is 2 channels. If the signal supplied to the two-channel stereophonic sound reproduction device is in the form of a% 2 set of sum signals when being reproduced by the three-dimensional stereophonic sound reproduction device, each channel signal in the original four-channel stereophonic sound signal With respect to a listener who is facing a predetermined direction at a predetermined position with respect to two speakers in a two-channel stereophonic sound reproducing apparatus, the corresponding sound signals are respectively near one side of one side of the listener to near another side of one side 1 Can be localized at any of the intended positions within the range of about 18 leaves, and thus all the problems already described are well solved by the present invention scheme. In addition, even if each channel signal of the four-channel stereophonic sound signal generated by the method of the present invention is supplied to four speakers arranged as required in the space to perform four-channel stereophonic sound reproduction, it is impossible. It is possible to perform no four-channel stereophonic sound reproduction, and it is possible to significantly facilitate the creation of programming in the four-channel stereophonic sound system by adopting the present invention system. 1 Figure 1 also (Figure 説明 鴫 (は is an explanatory view of the arrangement of the re-main sound source (speaker) in the four-channel stereophonic sound main system, Figure 2 is a block diagram of an example of the sound image localization circuit FIG. 3 is an explanatory view of a transfer characteristic between an existing sound source and a listener, and FIG. 4 to FIG. 7 are block diagrams of the system of the present invention, respectively. S-O, B-O 01-8 IO 4 ... Sound image localization circuit, F x -4 channel 3D sound signal transformation circuit% α □ · · I signal conversion device, SX 2 · · Second signal conversion device, ADD, f, jl ,. D to bt, b, · Adder, B, 9. S □ ˜ S4 ・ ・ Speaker, M · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 11 09-05-2019 12
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