KR20020035665A - Enhancer circuit of sound - Google Patents

Abstract

PURPOSE: A sound signal emphasis circuit is provided to compensate the phase of a middle-tone band and to emphasize and process sound signals of a low-tone band and a high-tone band. CONSTITUTION: A sound signal emphasis circuit consists of a sound input part(100), a right buffering part(200), a left buffering part(200'), a sound signal emphasizing and processing part(400), a sound adjustment part(500), a left output part(600'), a right output part(600), and a power supply part(700). A sound signal outputted from an external audio system is divided into a right sound signal and a left sound signal and inputted to the sound input part(100). The right buffering part(200) buffers the inputted right sound signal. The left buffering part(200') buffers the inputted left sound signal. The sound signal emphasizing and processing part(400) is composed of a differential part(410), an integral part(420), and a differential amplification part(430). The differential part(410) differentiates the buffered signals. The integral part(420) integrates the buffered signals. The differential amplification part(430) adds the differentiated and integrated signal components to the input signals and amplifies the differences between the added signal and the original signals. The sound adjustment part(500) adjusts the signals generated from the sound signal emphasizing and processing part(400) within a preset range. The left output part(600') outputs the adjusted left sound signal. The right output part(600) outputs the adjusted right sound signal. The power supply part(700) is comprised of a power input part(710), an oscillation part(730), a zener stabilization part(720), a transformer(740), a rectification part(750), a static voltage part(760), and an output part(770). The power input part(710) receives voltage from an external source or a battery. The oscillation part(730) makes the inputted voltage generate an electrically continuous vibration. The zener stabilization part(720) supplies a stabilized voltage by maintaining the static voltage of the inputted voltage. The transformer(740) transforms the inputted voltage to a suitable voltage. The rectification part(750) rectifies the received voltage by removing a riffle component. The static voltage part(760) makes the rectified voltage into static voltage. The output part(770) supplies the static voltage to the circuit.

Description

Acoustic signal enhancement circuit {ENHANCER CIRCUIT OF SOUND}

The present invention relates to an acoustic signal enhancement circuit, and more particularly, to a circuit for processing an acoustic signal while maintaining the phase of a midrange portion.

Conventional devices for compensating original sound use the concept of equalizer (EQUALIZER), which splits the frequency band for each frequency, boots it, and sends it back to the speaker and amplifier.

In addition, the equalizer is not simple because it corrects the range by taking advantage of the mechanical characteristics of the many stages that the sound must pass through to receive and output the original sound.

In the conventional sound signal processing process as shown in FIG. 1, the analog and digital signals are mechanically controlled to prevent sound modulation.

As an example of the sound signal emphasis processing method, as described in Korean Laid-Open Patent Publication No. 1999-008471 (name of the invention: Acoustic signal waveform emphasis processing apparatus and method), it is to numerically prevent a negative modulation phenomenon. .

As disclosed in the previously disclosed invention, the acoustic signal waveform emphasis processing unit integrates the input signal using the one or more even-order integrators, and the input sound signal using the one or the plurality of even-order differentials. In particular, the input sound signal is added by adding the even-order differential signal, the even-order integral signal, and the even-order differential signal, which are in phase or in phase with the input sound signal, to be added to the input sound signal. It is possible to improve the sound quality by acquiring the frequency-gain (GAIN) characteristics without breaking the phase relationship between the mid-range and the low- and high-frequency frequencies close to the mid-range.

Figure 3a shows an example of the frequency-gain characteristics in the conventional acoustic signal emphasis circuit.

As shown, the frequency-gain characteristic of the acoustic signal emphasis processing unit is flat in the midrange.

In the low range, the lower the frequency, the greater the gain. In the high range, the higher the frequency, the larger the gain.

In addition, it is also possible to employ analog or digital methods for the specific methods of integration, derivative, addition, etc. in the sound signal emphasis processing unit.

That is, the arbitrary sound signal of any time interval does not lose its practical generality, and the frequency and phase components of the series obtained by applying the integral of the even order to the Fourier series and the derivative of the even order are determined with respect to the signal components of the original signal. Becomes frostbite or reversed.

Since it is already known which term in the Fourier series is in phase or inverse phase, the desired frequency-gain is obtained by adding a frequency component obtained by multiplying a suitable coefficient group to a signal obtained by acting the derivative of the even difference in the required band from this. It is possible to obtain characteristics.

FIG. 3B illustrates the frequency-phase characteristic of the sound signal enhancement processor when the frequency-gain characteristic shown in FIG. 3A is realized.

As shown, it can be seen that the phase distortion of the output signal relative to the original signal is zero degrees in the effective frequency range.

4 shows a specific circuit configuration when a conventional acoustic signal emphasis processing unit combines a passive element and an active element.

As shown in the figure, the low range emphasis circuit section 10, the high range emphasis circuit section 20, the low range adjustment circuit section 30, the high range adjustment circuit section 40 and the adder section 50.

In the above, the low range emphasis circuit section 10 includes N counters (11), 11-2, ..., 11- (N-1), 11-N, respectively connected to the outputs of the N-integral circuits (11). A first inverting amplifier circuit comprising 12-1, 12-2, ..., 12- (N-1), 12-N), operational amplifier 13 and resistor 14 to add the output of the counter And a second inverting amplifier circuit comprising a resistor 15, an operational amplifier 16, and a resistor 17 to add the output of the first inverting amplifier circuit and the output of the counter.

However, the equalizer technology does not have the same physical properties of the devices, such as the resistors that control the respective bands, so the connection parts do not match perfectly when reassembled.

Accordingly, there is a problem in that distortion of sound is distorted due to a lack of smooth sound correction in each sound range.

An example thereof is shown in FIGS. 2A and 2B.

Figure 2a is a measurement waveform of the conventional high tone tone, Figure 2b is a measurement waveform of the conventional low tone tone, the lower side is the input waveform and the upper side is the output waveform.

As shown, it can be seen that the input and output waveforms are quite staggered by comparing the positions of the lateral time widths of arbitrary points 9 to 16.

This shows that the bass and treble disregard and emphasize the phase relationship between the mids.

An object of the present invention is to emphasize a sound signal of a high tone and a low tone band while compensating for a phase of a mid range.

The present invention for achieving the above object, the sound input unit for receiving the sound signal from the outside separated into a left and right sound signal, and

A right buffering unit buffering the input right sound signal and a LEFT buffering unit buffering the input left sound signal;

A differential part that receives the buffered signal and differentiates it into a plurality of differentiators, an integral part that receives the buffered signal and integrates it into a plurality of integrators, and adds the differential and integrated signal components to an input signal and adds the signal An acoustic signal emphasis processor comprising a differential amplifier for comparing the signal with the original signal and amplifying the difference value;

A sound controller for adjusting a signal generated by the sound signal emphasis processor within a predetermined range;

A LEFT output unit and a RIGHT output unit for outputting the adjusted sound signal as a left sound signal and a right sound signal;

In order to supply power to the circuit, a power input unit for receiving a voltage output from an external power source, an oscillation unit for generating an electrically continuous vibration to the input voltage, and supplying a stabilized voltage by maintaining a constant voltage of the input voltage. A Zener announcing unit, a transformer for transforming the input voltage into a proper voltage, a rectifying unit for removing and rectifying the ripple component of the transformed voltage, a constant voltage unit for making the rectified voltage as a constant voltage of a power supply, respectively; Characterized in that the power supply consisting of an output unit for supplying the constant voltage to the circuit.

The present invention further includes adding signals output from the integrating unit and signals output from the integrating unit to the input sound signal in phase or antiphase with the input sound signal of the sound input unit. It is done.

The present invention is also characterized in that the sound signal emphasis processing unit includes a variable resistor for adjusting the intensity of the sound signal.

1 briefly illustrates a conventional sound signal processing process.

2A and 2B illustrate input and output waveforms when the process of FIG. 1 is performed.

3A and 3B illustrate frequency-gain characteristics and frequency-phase characteristics of a conventional acoustic signal emphasis processor.

4 is an exemplary view illustrating a specific circuit of a conventional sound signal emphasis processing unit.

5 is a block diagram showing an acoustic signal enhancement circuit according to the present invention.

6 illustrates the configuration of the sound control unit in FIG. 5 in more detail.

7 is an exemplary view illustrating a configuration of an acoustic signal emphasis processing unit according to the present invention.

8A and 8B are output waveform diagrams of the high range and low range appearing when the present invention is implemented.

<Description of the symbols for the main parts of the drawings>

100: sound input unit 200,200 ': buffering unit

300: power switching unit 400: sound signal emphasis processing unit

410: differential portion 420: integral portion

430: differential amplifier 500: sound control unit

600,600 ': Sound output part 700: Power supply part

710: power input unit 720: Zeneran government

730: oscillation unit 740: transformer

750: rectifier 760: constant voltage

770: output unit

Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

5 is a block diagram showing the configuration of the present invention as an example.

As shown, the sound input unit 100 receives the sound signal from the sound equipment, such as external audio, karaoke equipment and electronic musical instruments separated into a left and right sound signal, and

A right buffering unit 200 for buffering the input right sound signal and a LEFT buffering unit 200 'for buffering the input left sound signal;

A differential unit 410 that receives the buffered signal and differentiates it into a plurality of differentiators, an integrator unit 420 that receives the buffered signal and integrates it into a plurality of integrators, and the derivative and integrated signal components are input signals And an acoustic signal emphasis processing unit 400 including a differential amplifier 430 for adding and then amplifying the difference value by comparing the added signal with the original signal,

A sound control unit 500 for adjusting a signal generated by the sound signal emphasis processor 400 within a predetermined range;

LEFT output unit 600 'and RIGHT output unit 600 for outputting the adjusted sound signal to the left sound signal and the right sound signal,

In order to supply power to the circuit, a power input unit 710 receiving a voltage output from an external power source or a battery, an oscillation unit 730 for generating an electric continuous vibration to the input voltage, and a constant voltage of the input voltage. A Zener stabilizer 720 for maintaining and supplying a stabilized voltage, a transformer 740 for converting an input voltage to an appropriate voltage, a rectifier 750 for removing and rectifying the ripple component of the transformed voltage; The power supply unit 700 is composed of a constant voltage unit 760 for making the rectified voltage to the constant voltage of the required power, and an output unit 770 for supplying the constant voltage to the circuit.

Reference numeral 300 denotes a power switching unit.

The sound signal emphasis processor 400 integrates an input signal using a plurality of integrators and differentiates the input sound signal using a plurality of differentiators.

Then, by adding the integral signal and its derivative signal to the input sound signal in phase or inverse phase with the input sound signal, the phase relationship between the frequency components of the input sound signal, in particular, the midrange and the low range and the high range close to the midrange Get the characteristics without breaking them.

That is, the arbitrary sound signal of any time interval does not lose its practical generality, and the frequency and phase components of the series obtained by applying the integral of the even order to the Fourier series and the derivative of the even order are determined with respect to the signal components of the original signal. Becomes frostbite or reversed.

Since it is already known which term in the Fourier series is in phase or inverse phase, the desired frequency-gain is obtained by adding a frequency component obtained by multiplying a suitable coefficient group to a signal obtained by acting the derivative of the even difference in the required band from this. Get the character.

It is common to use a rectifier diode for the rectifier 750 of the power supply unit 700, and a constant voltage IC is generally used for the constant voltage unit 760.

Figure 6 shows an embodiment of the configuration of the sound control unit 500 in FIG.

As shown, the LEFT HIGH of the left sound signal, the RIGHT HIGH of the right sound signal, the LEFT LOW of the left sound signal, and the low range control of the right sound signal RIGHT LOW, one end is connected to the left and right sound signal control unit (LEFT VOLUME, RIGHT VOLUME), and the high-frequency control unit of the left sound signal (LEFT HIGH) and the right sound signal It consists of a fixed resistor and a variable resistor whose one end is connected to (RIGHT HIGH) and the low sound level control part of the left sound signal (LEFT LOW) and the right sound signal low level control part (RIGHT LOW).

In general, each control unit uses a variable resistor to adjust the variable resistance value so that the user can arbitrarily adjust the size of each sound signal within a predetermined range.

As shown in Fig. 6, the variable portion of the variable resistor connected to the sound signal control unit LEFT VOLUME is connected to the high frequency control unit LEFT HIGH and the low range control unit LEFT LOW, thereby exposing the user to the outside of the circuit. Adjust the variable resistor to adjust the size of the sound signal on the left.

Similarly, the variable portion of the variable resistor connected to the sound signal control unit RIGHT VOLUME is connected to the high-range control unit RIGHT HIGH and the low-range control unit RIGHT LOW so that the user adjusts the variable resistor exposed outside the circuit. The size of the sound signal on the left side can be adjusted.

In addition, it is preferable that one end of each variable resistor is configured to be grounded.

7 illustrates an example of a configuration of an acoustic signal emphasis processor 400 according to the present invention.

As shown, the waveform emphasis circuit 800 which performs waveforms relating to the high and low ranges with respect to the original signal applied between the input terminal and the ground terminal, and the original signal and waveform emphasis circuit applied between the input terminal and the ground terminal. And an addition circuit 900 for adding the waveform emphasis signal subjected to waveform emphasis at 800.

At this time, the variable resistor VRg, which can adjust the degree of emphasis, is connected between the resistor Rg and the ground.

The addition circuit 900 includes resistors VRg, Ri, Rf, and Rg, a capacitor Cg, and an operational amplifier OP1.

In this case, since the value of the resistor is set equal (Ri = Rf), the gain of the operational amplifier OP1 operates as an inverting amplifier having a value of 1.

That is, the output of the operational amplifier OP1 has the same magnitude as that of the input and the phase is reversed.

In addition, the resistance (Rg) has little effect on the input and output gain of the circuit.

In addition, since the resistance value is Rg &lt; Ri, the degree of emphasis of the high and low ranges in the addition circuit 900 can be neglected, and the influence of the resistance Ri can be ignored, and is determined in the relationship between the resistance Rg and the resistance Rf. do.

The capacitor Cg is a capacitor required in an actual operation circuit, and serves to reduce the DC offset of the operational amplifier OP1 and to remove unnecessary signal components in the low frequency region.

In FIG. 7, when the variable resistor VRg is adjusted, the relationship between the resistors VRg + Rg and the resistor Rf changes, whereby the emphasis level of the low and high ranges due to the original signal can be adjusted.

The waveform emphasis circuit 800 includes an integrating circuit (low pass filter circuit) composed of a plurality of resistors and capacitors, and a differential circuit (high pass filter circuit) composed of a plurality of resistors and capacitors.

In the waveform emphasis circuit 800, the absolute value of the impedance in the low range of the capacitor constituting the differential circuit is set to a value negligible compared with the absolute value of the impedance of the resistor and the capacitor constituting the integrated circuit.

In addition, in the waveform emphasis circuit 800, the absolute value of the impedance in the high range of the capacitor constituting the integrating circuit is set to a value that is negligible compared with the absolute value of the impedance of the resistor and the capacitor constituting the differential circuit.

Fig. 8A shows the output waveform of the high range when the present invention is implemented, and Fig. 8B shows the output waveform of the low range.

As shown, each lower waveform represents an input waveform and the upper waveform represents an output waveform, and points 1,2,3, ... 7,8 represent input and output waveforms in the high and low frequencies at any time. Indicates that the phase is checked.

First, as shown in Fig. 8A, when comparing the waveform at the time of high-frequency input and the waveform at the time of output, the points 1,2,3,4 showing the phases at which the signal at the input is checked every arbitrary time and the signal at the time of output are shown. Comparing the phases of phases 1, 2, 3, and 4 with phases checked at random times, it can be seen that they are in phase.

Similarly, at low frequencies, points 5, 6, 7, and 8 show the phases of the input signal checked at random times, and points 5, 6, 7, 8 show the phases of the signal at the time output checked at random times. Comparing the position and phase in time, we can see that it is in phase.

Compared with Figs. 2A and 2B showing the prior art, it can be seen that the present invention emphasizes the bass portion and the treble portion without destroying the phase relationship between the middle portion.

As described above, the present invention prevents the modulation of sound with negative numerical control by using a method of re-integrating the sound range with respect to the derivative, zero point, and the volume by establishing zero point. There is no sound distortion even if you increase it.

In addition, according to the present invention, both analog and digital circuits, which are existing principles of sound reproduction, can be implemented on one chip, thereby reproducing sound as close to the original sound as possible.

Claims (3)

A sound input unit for separating and inputting sound signals from the outside into left and right sound signals; A right buffering unit buffering the input right sound signal and a LEFT buffering unit buffering the input left sound signal; A differential part that receives the buffered signal and differentiates it into a plurality of differentiators, an integral part that receives the buffered signal and integrates it into a plurality of integrators, and adds the differential and integrated signal components to an input signal and adds the signal An acoustic signal emphasis processor comprising a differential amplifier for comparing the signal with the original signal and amplifying the difference value; A sound controller for adjusting a signal generated by the sound signal emphasis processor within a predetermined range; A LEFT output unit and a RIGHT output unit for outputting the adjusted sound signal as a left sound signal and a right sound signal; In order to supply power to the circuit, a power input unit for receiving a voltage output from an external power source, an oscillation unit for generating an electrically continuous vibration to the input voltage, and supplying a stabilized voltage by maintaining a constant voltage of the input voltage. A Zener announcing unit, a transformer for transforming the input voltage into a proper voltage, a rectifying unit for removing and rectifying the ripple component of the transformed voltage, a constant voltage unit for making the rectified voltage as a constant voltage of a power supply, respectively; A sound signal emphasis circuit comprising a power supply consisting of an output unit for supplying the constant voltage to the circuit. 2. The method of claim 1, wherein the sound signal emphasis processor adds the signal output from the integrator and the signal output from the derivative to the input sound signal in phase or antiphase with the input sound signal of the sound input unit. An acoustic signal emphasis circuit. The sound signal emphasis circuit according to claim 2, wherein the sound signal emphasis processing section includes a variable resistor for adjusting the strength of the sound signal.