JPS51134102

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DESCRIPTION JPS51134102
1 、 Name of invention
Stereo sound reproduction device
3. Detailed Description of the Invention The present invention relates to a stereophonic sound
reproducing apparatus based on EndPage: 1-n which closely approximates an acoustic state
obtained by emitting sound from a speaker device to a natural space. である。 When listening to
stereo sound, it is desirable to emit a stereo signal from the speaker device to a natural space to
create an acoustic state, but in general homes, stereo sound reproduction by the speaker device
can not often be satisfactory due to the surrounding environmental conditions. Thus, the stereo
sound by the speaker device. If sound reproduction can not be satisfactory, stereo sound
reproduction with a headphone can be considered. However, as is well known, when playing back
and listening with a headphone, it is felt that the sound image to be reproduced is positioned in
the listener's head. This is called the lateralization effect. Since this lateralization effect makes the
listener noticeably uncomfortable, even during stereo sound reproduction by the headphone, the
sound image is spread forward of the listener as in stereo sound reproduction using the speaker
device. You need to Therefore, there have been proposed a number of ways to reduce the abovementioned lateralization effect so as to be able to listen closely to the speaker device. For
example, means for obtaining directionality detection signal related to head movement with
respect to any reference direction, means for controlling time difference and level of each
channel signal applied to the headphone by the directionality detection signal, and the control A
method has been proposed which comprises combining each of the different channel original
signals with each of the respective channel signals and adding them to the left and right of the
headphone. By using such a spatereo sound reproduction attachment, it is possible to reproduce
stereo sound under conditions similar to those of the speaker device. The present invention is
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directed to a purely electronic improvement of the delay circuit in a stereophonic sound
reproduction apparatus as described above. A further object of the present invention is to use a
pure electronic delay device, in which the delay time can be varied continuously, in a
stereophonic sound reproducing device as described above.
Stereo sound reproduction device
The present invention will be described in detail below with reference to the drawings. First,
before describing the configuration of each part of the present invention, the operation principle
of the purely electronic delay device used in the present invention will be described with
reference to the drawings shown in FIG. For example, as shown in FIG. 1 [A], the capacitor Co-C is
connected to the switches S and -S. されている。 Since the signal source is connected to the
capacitor C8 and sugared, the potential at both ends fluctuates according to the potential of the
signal source. Switch S interlocking now. , S3, s are turned on by the clock signal f1, and the
switch S2. When S4 and S6 are turned off, the charge of the capacitor C6 is transferred to the
capacitor C1, the charge of the capacitor C2 to the capacitor C3, and the bridge of the Hunden
+04 to the capacitor C3. Next, when the switches S, S8 and S are turned off and the switches S2,
S4 and S6 are turned on by the clock signal f2, the charge stored in the capacitor C8 is
transferred to the capacitor C2, C3 to C4, and C5 to C6. . Therefore, the charge initially in the
capacitor C8 can be sequentially transferred by alternately turning on and off the switch
alternately, and finally, most of it can be taken out from the output end. The switch is on for the
time when the charge of capacitor C6 is transferred to the output end. The longer the delay, the
longer the number of capacitors. However,-), a considerable number of capacitors are required to
obtain sufficient delay. The block diagram shown in FIG. 1 [B) shows the configuration of the
above-mentioned pure electronic delay device, which is a clock generating the clock signals J '+, /
2, the pulse oscillator 1, and FIG. The delay circuit 2 described above and the clock signal / ,,! If a
signal is input to the input end, for example, the delay time Δj-% '(where 185 is the number of
capacitors, ft is The signal that is delayed by the clock frequency) can be taken out from
EndPage: 2 end. The present invention uses a pure electronic delay circuit as described above in
particular in a stereo sound reproducing apparatus, and will be described in detail based on the
embodiment of the stereo sound reproducing apparatus according to the present invention
shown in FIG. The embodiment shown in FIG. 2 is a block diagram showing an example when the
present invention is applied to a two-channel stereo sound reproducing apparatus. まず1. The
means 4 for detecting the rotational movement of the head of the thief in the left or right
direction with respect to any reference direction and obtaining two control signals related to the
rotational direction is, for example, a magnetic needle by the horizontal component of
geomagnetism. , And take out the angle of change as a change in the amount of electricity.
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For this purpose, for example, a magnetic needle is provided at the center of a circular sliding
resistance fed at both ends, thereby sliding the resistor so that the rotational angle is
proportional to the amount of output electricity and the rotational angle is detected. May be In
addition, as shown in FIG. 3, in order to detect a change in which the head of the listener rotates
in the horizontal direction, a detector 4b such as a variable resistor attached to the support
means 4a and a detection ring 4C attached to the listener For example, it connects the head with
the head and the part of the band in contact with the head, detects the horizontal rotational
movement of the head in the left or right direction, and controls the two control signals related to
that horizontal rotational direction; As a reference, a control signal related to horizontal-tohorizontal movement of the head to the left and a control signal related to horizontal-rotation to
the right of the head relative to the median plane are obtained. Two clocks, pulse oscillators α,
b) f 'the clock frequency of the reference. If so, its frequency f. The frequency of each of the two
control signals is varied by a frequency of .DELTA.f. The two delay circuits 2α and 2b are
supplied with clock signals from the clock and pulse oscillators 1α and 1b as described in the
explanation of FIGS. 1A and 1B, respectively (f11? 2) It is possible to give delay to the binola and
lu signal put in the input end L% R by i, m. Furthermore, the clock frequency generated by the
clock and pulse Jl [units 1α and 1b is the reference clock frequency f. It changes in the opposite
direction centering on Also in this case the reference clock frequency f. The absolute values of
the change centering on are equal. Therefore, for example, assuming that the delay time of delay
circuit 2α becomes long, the delay time of delay circuit 2α becomes t + Δt (1), and the delay
time of one delay circuit 2b is , T-Δt ··············· (2) The delay time on the delay circuit 2b side with
respect to the delay circuit 2α side is (delay time on the delay circuit 2h side) − (delay time on
the four delay circuit 2α side) 1 (121) = (1) ((-.DELTA.t)-(t + .DELTA.t) =-2.DELTA.t, and the
output of the delay circuit 2b is advanced by 2.DELTA.t with respect to the output of the delay
circuit 2a. It will be. In other words, the output of the delay circuit 2α is delayed by 2Δt from
the output of the delay circuit 2b. Thus, the clock, pulse oscillators lα and 1b to each other
reference clock frequency f. The delay time of the delay circuits 2α and 2b can be changed
differentially and continuously by changing in the opposite phase centering on the phase shift.
Also, by causing the delay operations of the two delay circuits 2α and 2h to work differentially
as described above, the delay time is zero (ie, when the delay times of the two delay circuits 2α
and 2h are equalized) Even if the two signals to be transmitted are actually delayed, it is possible
to finely change the delay times near and near the point where the listener feels that the delay
time is zero. Therefore, by providing the above-described purely electronic and differentially
delaying N delay circuit of the present invention in a stereophonic sound reproducing apparatus
that reproduces a stereophonic sound signal of at least 2 'channel using a headphone. The effect
on the surrounding environment EndPage: 3 is a feature that enables stereo sound reproduction
by the speaker apparatus and listening of reproduction sound under return conditions without
being affected.
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4. Brief Description of the Drawings FIG. 1 [Ai and CB] are diagrams and block diagrams for
explaining the operation principle of a delay device consisting of a pure electronic circuit used in
the present invention. FIG. 2 is a block diagram showing an embodiment of a stereophonic sound
reproducing apparatus according to the present invention. FIG. 3 is a side view showing an
embodiment of means for detecting horizontal rotational movement of the head to the left or
right with respect to any reference direction and obtaining two control signals related to the
rotational male voice. -C6 · · · · · · · · · · · · · · C C · · · · · · · · · switch, J '+, j' t · · · clock signal, 1, 1 α, 1
b · · · clock, pulse oscillation M, 2, 2 α, 2 b · · · delay M: 3 ··· p-pass filter, 4 · · · Means for
obtaining two control signals, 5 · · · Headphones, L · R · · · Pinaural signal input end. F 3 Fig. 6,
Inventors other than the above Name Hiroshi Aoyama EndPage: 4
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