JP2006050338

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DESCRIPTION JP2006050338
An object of the present invention is to simplify the structure, reduce the manufacturing cost and
the number of processes, and provide excellent effects. An analog / digital signal converter (1), a
CPU (2), a digital signal processor (3), a ROM (5), a digital / analog signal converter (4), and a
filter / buffer (6) And a power amplifier (7), a speaker (8) and an audio box (9). [Selected figure]
Figure 1.
Digital audio frequency quality improvement device
[0001]
The present invention relates to a digital audio frequency quality improving apparatus, and more
particularly to a digital audio frequency quality improving apparatus that processes flat
frequency response curves so as to be able to be output using an operation method.
[0002]
In the prior art, in order to improve the unsuitability of the frequency response curve of the
speaker body, and also to prevent the occurrence of the inconvenience of the secondary
frequency response curve due to the voice box, in general Performs an adjustment to the
response curve of the speaker and audio box frequency by joining the compensation circuit into
its circuit.
The configuration of the conventional compensation circuit is as follows.
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[0003]
First, the conventional compensation circuit uses a plurality of passive elements, for example, low
pass filters including high inductance, capacitors, and resistors, high pass filters, and band pass. ·
Resolving the poor problem of frequency response by a method such as attenuation or increase
by connecting in series or connecting in parallel by using filters of plural types such as filters,
etc. It is. However, in the case of the above method, the problem of the frequency response can
be solved, but since it is an array combination of a plurality of inductances, capacitors, resistors,
etc., in some cases, more frequency points in the frequency curve. However, when the correction
is required, the difficulty is relatively improved, and the number of required elements is also
relatively increased. Therefore, when the volume is increased, the cost is also improved, and such
a scheme can usually only perform some corrections and it is impossible to perform full
corrections.
[0004]
Second, the amplifier is used to solve the problem of relatively increasing the volume of the
entire electric circuit in order to improve the volume of the element in which the conventional
compensation electric circuit is used. Thus, a method of replacing the filter is proposed, and in
the above-mentioned amplifiers, high-pass amplifier, low-pass amplifier, band-pass amplifier, etc.
as main amplifiers are utilized by utilizing the characteristics of the amplifiers. By operating, the
magnification is enlarged, and the operation of "+,-" is appropriately performed, and a plurality of
sets are connected in series or in parallel to obtain a required frequency curve. Even so, although
the volume of the elements required for the electric circuit between the amplifiers is smaller than
in the case of using the filter, the number of the elements to be used increases and the frequency
point to be adjusted increases. This increases the number of levels, which in addition to
increasing volume and cost, also makes distortion easy, and the design difficulty is relatively
improved.
[0005]
Also, when creating a compensating electrical circuit with a filter or amplifier, they have one
similar drawback, ie after the speaker body has been altered, its frequency response curve must
also change, so that the speaker and the audio If changes are made to the box, it is necessary to
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set up all the electrical circuits again. If the speaker or voice box can not make the change, its
frequency response curve becomes untuneable, which is also a serious design issue.
[0006]
Therefore, the above-mentioned conventional products still have many problems, and need not
be a good design but be extremely improved.
[0007]
The inventor of the present invention has made efforts to implement improvement and creation
in light of the problems of the respective items generated in the above-described conventional
compensation electric circuit, and carried out research and development with multiple years of
hard work. As a result, the digital audio frequency quality improving apparatus of the present
invention has finally been presented.
[0008]
The present invention makes the computer have a superior frequency response curve by storing
and storing the curve information after appropriately performing simulation adjustment on the
frequency response curve of the speaker and voice box acquired at any time in the computer.
Providing a digital audio frequency quality improving device is the main problem to be solved.
[0009]
In addition, the present invention changes the design at any time if a read only memory (ROM)
simply storing the frequency response curve of the speaker and the voice box is inserted into the
electric circuit board during the manufacturing process. It is an object of the present invention to
provide a digital audio frequency quality improving device capable of achieving the purpose.
[0010]
In addition, the present invention converts the DSP operation result into a serial signal through
the CPU, and then sends it to the digital / analog signal converter to convert it into an analog
signal, thereby causing the burden on the DSP to execute complicated operation. The third
problem to be solved is to provide a digital voice frequency quality-improving device capable of
reducing and maintaining the purpose of voice quality.
[0011]
In addition, the present invention sets the maximum output level of the digital / analog signal
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converter first, and prevents generation of cutting distortion when an excessive signal is input to
the power amplifier. In the fourth solution, it is intended to provide a digital audio frequency
quality-improving device that can create a compression circuit and improve cutting distortion by
using a plurality of elements and a composite electric circuit. To be
[0012]
The digital audio frequency quality improving device which can achieve the above purpose
includes an analog / digital signal converter, a CPU, a digital signal processor (DSP), a ROM, a
digital / analog signal converter, a filter / buffer, a power amplifier, A speaker and an audio box,
in which the ROM can store frequency response curves of the speaker and the audio box, and the
analog / digital signal converter receives the audio frequency signal, and The voice signal is
converted to a digital signal and then sent to the CPU, the signal received by the CPU is
converted to a parallel signal, then the signal is sent to the DSP, and the frequency curve and
operation stored in the ROM are calculated. And then feed the operation result back to the CPU
to convert it into a serial signal. Then, by sending it to a digital / analog signal converter and
converting it to an analog signal, it passes through a filter and a buffer, performs filtering, is
expanded by a power amplifier, and is output to a speaker and an audio box, Enables flat
frequency response curve output.
[0013]
The technical content of the present invention, its object, and its effectiveness will be described
in detail by citing an excellent embodiment of the present invention and by referring to the
attached drawings.
[0014]
As shown in FIG. 1, the digital audio frequency quality improving apparatus according to the
present invention mainly comprises a digital / analog signal converter 1, which receives an audio
frequency analog signal 10 from stereo, and then an audio frequency. The analog signal 10 is
converted to a digital serial signal 11 and then sent to the CPU 2.
[0015]
The CPU 2 becomes the control center, which receives the digital serial signal 11 from the analog
/ digital signal converter 1 and arranges the digital serial signal 11 into the parallel signal 21 and
then the signal 21 as a digital signal Transmit to processor 3 (DSP), execute operation, and feed
back parameter signal after completion of operation to CPU 2 and convert it to digital serial
signal 22 and transmit to digital / analog signal converter 4 .
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[0016]
Also, the ROM (for example, EEPROM) 5 is connected to the digital signal processor 4 and used
for storing and storing originally owned frequency response curve parameters of the speaker 8
and the audio box 9.
[0017]
Further, the digital signal processor 3 (DSP) receives the signals from the CPU 2 and the ROM 5
and performs operation based on the received signals, using the frequency response curve of the
speaker as the operation parameter. For example, A signal represents the frequency response
curve of speaker 8 and voice box 9, and B signal is the minus number of A signal, such as A
signal parameter value + B signal parameter value = C signal parameter value. Also, the C signal
has a flat frequency response curve, so that the digital signal processor 3 previously stores in the
ROM 5 at the time of operation in order to output the C signal having the flat curve to the
speaker 8 and the voice box 9. The signal of the A signal, and take the parameters of the B signal
of the minus number of that A signal. And transmit the negative number B signal parameter to
the CPU 2 and convert it to the digital serial signal 22 and also transmit it to the digital / analog
signal converter 4, and according to such a transmission and reception system, the digital signal
The burden of processor 3 performing complicated operations can be reduced, the reduction in
transmission / reception speed can be avoided, and the effect that the voice quality of the last
voice is relatively reduced can be effectively prevented. Have.
[0018]
When the digital / analog signal converter 4 receives the minus B signal from the CPU 2, it
converts the received signal into an analog signal 41 and sends it to the filter / buffer 6 for
filtering After buffering, it is transmitted to the power amplifier 7 to expand its power, and
finally, the expanded negative number B signal is transmitted to the speaker 8 and the audio box
9, and the speaker 8 and the audio box 9 The C signal can be obtained by adding the parameter
of the minus B signal to the A signal parameter of the frequency response curve, and the C signal
becomes equal to 0 , so the flat frequency of the speaker 8 and the voice box 9 It can be
processed to output a response curve.
In addition, the CPU 2 can set the output maximum level of the digital / analog signal converter 4
according to the operation result of the digital signal processor 3, and therefore generates
cutting distortion when an excessive signal is input to the power amplifier 7. Can be prevented.
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[0019]
In addition, stereo audio frequency signal information acquired by the analog / digital signal
converter 4 through the CPU 2 is processed by the digital signal processor 3 between the left and
right sound channels of the low pass filter and the high pass filter. Are added to each other and
then divided by 2, and using a low pass filter to perform calculations with the above-mentioned
signals and other speaker parameters, and then through the other digital / analog signal
converter 4 You can get the good curve output of the other sound channels (Heavy low voice,
Heavy low voice).
[0020]
Also, if the original frequency response curve parameters of the speaker 8 and the voice box 9
are stored in the ROM 5 or other related elements, and the frequency response curve of the
speaker 8 and the voice box 9 changes, the changing frequency Since the response curve
parameters can optionally be stored and stored in the ROM 5 or other related elements, the
disadvantages of the conventional compensation circuitry can be ameliorated.
[0021]
The present invention further has the following advantages when compared with the digital
audio frequency quality improving device provided by the present invention and other prior art
techniques: (1) The present invention provides a speaker and an audio box acquired from time to
time. The frequency response curve can be simulated in advance by the computer, and then the
curve information can be stored and stored to obtain the best frequency response curve.
(2) According to the present invention, the design can be changed as needed by inserting the
ROM storing the speaker and the voice box frequency response curve into the electric circuit
board during the manufacturing process.
(3) The present invention converts the operation result of the DSP into a serial signal through the
CPU, sends it to a digital / analog signal converter, converts it into an analog signal, and the DSP
needs the complex operation. Can significantly reduce the burden on the user, and the purpose of
maintaining voice quality can be achieved.
(4) Since the present invention sets the maximum output level of the digital / analog signal
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converter earlier, it can prevent the generation of cutting distortion when an excessive signal is
input to the power amplifier. It is not necessary to make a compression circuit using a plurality of
elements and a complicated circuit as in the conventional method and eliminate the cutting
distortion.
[0022]
What has been described above is merely illustrative of certain possible embodiments of the
present invention and is not intended to narrowly limit the claimed scope of the present
invention, but rather to the technical spirit of the present invention. It goes without saying that
all modifications, alterations, partial diversions and the like having all the other homologous
effects implemented on the basis of the present invention should be delivered within the claimed
scope of the present invention.
[0023]
As described above, the present invention already has novelty, inventive step and industrial
applicability, since the technical idea can enhance the effects of the above-mentioned plural items
over the conventional one while having a new creation. As it falls under the requirements of a
patent, we will file an application in accordance with the law, but upon inspection we hope that it
will be released early.
[0024]
FIG. 1 is a block diagram of a digital audio frequency quality enhancing apparatus according to
the present invention.
Explanation of sign
[0025]
1 analog to digital signal converter 2 CPU 3 digital signal processor 4 digital to analog signal
converter 5 ROM 6 filter / buffer 7 power amplifier 8 speaker 9 audio box 10 audio frequency
analog signal 11 digital serial signal 21 parallel signal 22 digital serial Signal 41 Analog signal
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