CN116582791A - Device for improving sound playback effect and sound system using same - Google Patents

Abstract

The invention discloses a device for improving sound playing effect and an audio system using the same, wherein the device includes an isolation circuit, an even harmonic detection circuit, a DC blocking circuit and an even harmonic superposition circuit, and the isolation circuit is used for The original sound signal is generated into a new sound signal whose phase is the same or opposite to that of the original sound signal, whose amplitude is 0.001‑10000 times that of the original sound signal, and which is electrically isolated from the original sound signal; the even harmonic detection circuit is used to utilize The principle of unidirectional conductivity of semiconductor devices generates a signal that is output as the absolute value of the new sound signal; the DC blocking circuit is used to remove the DC component in the signal of the absolute value of the new sound signal; the even harmonic superposition circuit is used to convert The signal of the absolute value of the new sound signal with the DC component removed is processed, and the processed signal is superimposed with the original signal.

Description

Device for improving sound playback effect and sound system using same

technical field

The invention belongs to the technical field of electroacoustics, and in particular relates to a device for improving the sound playing effect and an audio system using the device.

Background technique

Harmonic distortion in audio refers to the nonlinear distortion generated during the amplification or processing of audio signals, which introduces frequency components that do not exist in the original signal. Harmonic distortion can be divided into even-order harmonic distortion and odd-order harmonic distortion, and there are certain differences in their influence on the sense of hearing. Even harmonics refer to the frequency components produced by distortion that are even multiples of the fundamental frequency of the original signal. For example, if the fundamental frequency is f, the even harmonics include 2f, 4f, 6f, etc.

Whether even harmonic distortion in speakers is more pleasing to listen to depends on personal listening preference and sound characteristics. Some might argue that moderate even harmonic distortion makes the sound sound warmer, more natural, and thus more pleasing. Mainly because there is a simple multiple relationship between the even harmonics and the fundamental frequency, making them easier to integrate in music. Whether even harmonic distortion in speakers is more pleasing to hear depends on personal listening preference and sound characteristics. However, in practical applications, ordinary audio systems do not extract even harmonics for playback.

Contents of the invention

In view of the above problems, the technical problem to be solved by the present invention is to provide a device for improving the sound playback effect, so as to solve the problem in the prior art that the sound playback effect cannot be adjusted according to personal preferences.

Meanwhile, the present invention provides an audio system for adjusting the sound effect output of the audio system by using the above device for improving sound playback effect.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

The first aspect of the present invention provides a device for improving the sound playback effect, including an isolation circuit, an even harmonic detection circuit, a DC blocking circuit and an even harmonic superposition circuit,

The isolation circuit is used to generate a new sound signal from the original sound signal with the same phase as or opposite to the original sound signal, an amplitude of 0.001-10000 times the original sound signal, and electrical isolation from the original sound signal;

The even-order harmonic detection circuit is used to generate a signal output as the absolute value of the new sound signal by utilizing the principle of unidirectional conductivity of a semiconductor device;

The DC blocking circuit is used to remove the DC component in the signal of the absolute value of the new sound signal;

The even harmonic superimposition circuit is used to process the signal of the absolute value of the new sound signal from which the DC component has been removed, and to superimpose the processed signal with the original signal.

In a possible implementation manner, the isolation circuit includes a transformer.

In a possible implementation manner, the even-order harmonic detection circuit includes four diodes, the cathode of the first diode and the anode of the second diode are connected together and connected to the first output terminal of the isolation circuit, and the third and second diodes are connected together. The cathode of the pole tube and the anode of the fourth diode are connected together and connected to another output terminal of the isolation circuit, and the anodes of the first diode and the third diode are connected together and connected to the input terminal of the DC isolation circuit , the cathodes of the second diode and the fourth diode are connected together and connected to the reference terminal.

In a possible implementation, the even harmonic detection circuit includes four diodes, the cathode of the first diode is connected to the anode of the second diode, the cathode of the third diode is connected to the anode of the fourth diode The anodes of the tubes are connected together, the anodes of the first diode and the third diode are connected together, and the cathodes of the second diode and the fourth diode are connected together.

In a possible implementation manner, the even-order harmonic detection circuit includes two diodes, the cathode of the first diode and the cathode of the second diode are connected together and connected to the input terminal of the DC blocking circuit, and the first and second diodes The anode of the pole tube is connected to an output end of the isolation circuit, the anode of the second diode is connected to another output end of the isolation circuit, and the center tap of the isolation circuit is connected to a reference end.

In a possible implementation, the even-order harmonic detection circuit includes two diodes, the anodes of the first diode and the second diode are connected together and connected to the input end of the DC blocking circuit, and the first and second diodes are connected together and connected to the input terminal of the DC blocking circuit. The cathode of the pole tube is connected to an output end of the isolation circuit, the cathode of the second diode is connected to another output end of the isolation circuit, and the center tap of the isolation circuit is connected to a reference end.

In a possible implementation manner, the DC blocking circuit includes a DC blocking capacitor.

In a possible implementation manner, the value range of the DC blocking capacitor is 10pF-100F.

In a possible implementation manner, the even-order harmonic superposition circuit includes two resistors, the third resistor is connected to the output terminal of the DC blocking capacitor, and the other end of the third resistor is connected to one end of the fourth resistor and then connected to one end of the load , the other end of the fourth resistor is connected to the other end of the load.

In a possible implementation manner, the value range of the third resistor is 0-100MΩ, and the value range of the fourth resistor is 0-+∞Ω.

The second aspect of the present invention provides an audio system, which is characterized in that it includes the device for improving the sound playback effect and the load as described above, and the non-ideal Transmission line connection.

Adopting the present invention has the following beneficial effects: the even harmonic components in the sound signal can be effectively increased, thereby improving the auditory effect of music.

Description of drawings

Fig. 1 is a schematic structural diagram of a device for improving sound playback effects according to an embodiment of the present invention;

Fig. 2 is a schematic circuit diagram of each module in a specific application example;

Fig. 3 is the circuit schematic diagram of each module in another specific application example;

Fig. 4 is the circuit schematic diagram of each module in another specific application example;

Fig. 5 is the circuit schematic diagram of each module in another specific application example;

Fig. 6 is a schematic structural diagram of an audio system according to an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Referring to Fig. 1, it is a schematic structural diagram of a device for improving the sound playback effect according to an embodiment of the present invention, including an isolation circuit 1031, an even harmonic detection circuit 1032, a DC blocking circuit 1033 and an even harmonic superposition circuit 1034, the isolation circuit 1031 is used to generate a new sound signal from the original sound signal with the same phase as the original sound signal or opposite, the amplitude is 0.001-10000 times of the original sound signal, and electrically isolated from the original sound signal; even harmonic The wave detection circuit 1032 is used to utilize the unidirectional conductivity principle of a semiconductor device to generate a signal output as the absolute value of the new sound signal; the DC blocking circuit 1033 is used to remove the DC component in the signal of the absolute value of the new sound signal; The even harmonic superimposition circuit 1034 is used to process the signal of the absolute value of the new sound signal from which the DC component has been removed, and superimpose the processed signal with the original signal.

Referring to FIG. 2 , it shows a schematic circuit diagram of each module in the device for improving sound playback effect according to an embodiment of the present invention. VG1 is the input of the audio signal. R1 is an equivalent resistance of the non-ideal transmission line from the audio signal input end of the original system to the load end. It is drawn to demonstrate the working principle of the circuit and is not included in this device. Since the input part of the device is closer to the source end of the non-ideal transmission line, the output part of the device is closer to the end of the non-ideal transmission line. Due to the existence of distributed parameters such as distributed resistance on the non-ideal transmission line, R1 is equivalent to the resistance of the non-ideal transmission line connected to the non-ideal transmission line from the input end of the device to the output end of the device.

Continuing to refer to FIG. 2, the isolation circuit includes a transformer TR1. TR1 is the core component of the audio isolation circuit. It uses a transformer to generate a new sound signal whose phase is the same or opposite to that of the original sound signal and which is electrically isolated from the original signal. The amplitude of the new sound signal is 0.001-10000 times that of the original sound signal. It is worth pointing out that the TR1 transformer is the core component of the isolation circuit. As long as the isolation circuit contains a transformer, and the transformer is used to generate a new sound signal whose phase is the same or opposite to that of the original sound signal, and which is electrically isolated from the original signal. A sound signal, and the amplitude of the new sound signal is 0.001-10000 times of the original sound signal. It conforms to the description of this isolation circuit, is a reasonable deformation based on the above principles, and falls within the protection scope of this patent.

Continuing to refer to FIG. 2, the even-order harmonic detection circuit includes four diodes D1-D4, the cathode of the first diode D1 and the anode of the second diode D2 are connected together and connected to the isolation circuit (ie, the transformer TR1) One output end is connected, the cathode of the third diode D3 and the anode of the fourth diode D4 are connected together and connected with another output end of the isolation circuit (i.e. transformer TR1), the first diode D1 and the third The anodes of the diode D3 are connected together and connected to the reference terminal, and the cathodes of the second diode D2 and the fourth diode D4 are connected together as an output terminal and connected to the input terminal of the DC blocking circuit. The even-order harmonic detection circuit composed of D1-D4 uses the principle of unidirectional conductivity of semiconductor devices to generate a signal that is output as the absolute value of a new sound signal. In practical applications, the even-order harmonic detection circuit only needs to include D1-D4 and connect the cathode of the first diode D1 to the anode of the second diode D2, the cathode of the third diode D3 to the fourth diode Even harmonic detection of the connection relation of the anode connection of the tube D4, the anode connection of the first diode D1 and the third diode D3, and the connection relationship of the cathode of the second diode D2 and the fourth diode D4 The circuit conforms to the description of the even-order harmonic detection circuit, is a reasonable deformation based on the above principles, and falls within the scope of protection of this patent.

Continuing to refer to FIG. 2, the DC blocking circuit includes a DC blocking capacitor C1, which is used to remove the DC component in the signal of the absolute value of the above-mentioned new sound signal by using the principle of capacitor blocking DC and AC. As long as the circuit contains a DC blocking capacitor such as C1, the value of this capacitor ranges from 10pF to 100F, and it appears after the above-mentioned even-order harmonic detection circuit, it conforms to the description of this DC blocking circuit and belongs to the category based on Reasonable deformations of the above principles fall within the protection scope of this patent.

Continue to refer to Figure 2, the even-order harmonic superposition circuit includes two resistors R3 and R4, one end of the third resistor R3 is connected to the output end of the DC blocking capacitor, the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and then connected to the load One end of the fourth resistor R4 is connected to the other end of the load. R3 and R4 together constitute an even harmonic superimposition circuit, which performs amplitude attenuation adjustment on the signal of the absolute value of the new sound signal with the DC component removed, and superimposes the processed signal with the original signal. Finally, at the signal output, a sound signal with enhanced even harmonic components is obtained. The functions realized by R3 and R4 are voltage division and impedance matching. The value range of R3 is 0-100MΩ, and the value range of R4 is 0-+∞Ω. R3 and R4 can also be replaced by devices such as potentiometers to achieve the same function. Each resistor in R3 and R4 can also be composed of multiple resistors. As long as the circuit conforms to the above features and connection methods, and is connected after the DC blocking circuit, it complies with the description of the even-order harmonic superposition circuit and falls within the scope of protection of this patent.

Referring to FIG. 3 , in an embodiment, the even harmonic detection circuit also includes four diodes D1 - D4 , but the connection method is slightly different from that in FIG. 2 . The cathode of the first diode D1 and the anode of the second diode D2 are connected together and connected to an output terminal of the isolation circuit, and the cathode of the third diode D3 is connected together with the anode of the fourth diode D4 And be connected with another output end of the isolation circuit, the anode of the first diode D1 and the third diode D3 are connected as the output end to connect the input end of the DC isolation circuit, the second diode D2 and the fourth diode The negative poles of D4 are connected together and to the reference terminal. The even-order harmonic detection circuit composed of D1-D4 uses the principle of unidirectional conductivity of semiconductor devices to generate a signal that is output as the absolute value of a new sound signal. In practical applications, the even harmonic detection circuit only needs to include such even harmonic detection circuits as D1-D4, and the negative pole of the first diode D1 is connected to the positive pole of the second diode D2, and the third and second diodes The cathode of the diode D3 is connected to the anode of the fourth diode D4, the anode of the first diode D1 is connected to the third diode D3, the cathode of the second diode D2 is connected to the fourth diode D4, Those that meet such a connection relationship are in line with the description of this even-order harmonic detection circuit, which is a reasonable deformation based on the above principles, and falls within the scope of protection of this patent.

Referring to Fig. 4, in one embodiment, the even-order harmonic detection circuit includes two diodes D1-D2, and the cathode of the first diode D1 and the cathode of the second diode D2 are connected together as the output terminal for DC blocking At the input end of the capacitor, the anode of the first diode D1 is connected to an output end of the isolation circuit, the anode of the second diode D2 is connected to another output end of the isolation circuit, and the center tap of the isolation circuit is connected to the reference end. The even-order harmonic detection circuit composed of D1-D2 uses the principle of unidirectional conductivity of semiconductor devices to generate a signal that is output as the absolute value of a new sound signal.

Referring to Fig. 5, in one embodiment, the even-order harmonic detection circuit includes two diodes D1-D2, and the anode of the first diode D1 is connected to the anode of the second diode D2 as the output terminal connected to the DC blocking capacitor At the input end, the cathode of the first diode D1 is connected to an output end of the isolation circuit, the cathode of the second diode D2 is connected to another output end of the isolation circuit, and the center tap of the isolation circuit is connected to the reference end. The even-order harmonic detection circuit composed of D1-D2 uses the principle of unidirectional conductivity of semiconductor devices to generate a signal that is output as the absolute value of a new sound signal.

In a specific application example, the working process of the device for improving the sound playback effect set above is as follows:

The isolation circuit uses a transformer to generate a new sound signal whose phase is the same as or opposite to that of the original sound signal and which is electrically isolated from the original signal. The new sound signal is obtained at the output of the transformer isolation circuit.

Assuming that the voltage effective value of a fundamental wave or harmonic of the new sound signal is U, the expression of the instantaneous value of the new sound signal is:

In formula (1), it is assumed that the new sound signal is a sine wave with a fundamental wave of frequency f, and the reference point of the time axis is placed at the initial position of the waveform. u ₁ is the instantaneous value of the voltage of the new sound signal; U is the effective value of the voltage of the new sound signal; ω is the angular frequency, the value is 2πf; t is the time.

The even-order harmonic detection circuit utilizes the principle of unidirectional conductivity of semiconductor devices, and the signal of the absolute value of the new sound signal generated is:

In formula (2), u ₂ is the instantaneous expression of the absolute value signal of the new sound signal. In its expansion formula, the coefficients in front are the approximate values after the above absolute value calculation is expanded according to the frequency.

The DC blocking circuit removes the DC component in the signal of the absolute value of the above-mentioned new sound signal to obtain the following signal containing even harmonic components:

u ₃ ＝-0.6Ucos2ωt-0.12Ucos4ωt-0.05Ucos6ωt-...(3)

In the formula (3), u ₃ is the instantaneous expression of the signal with the DC component removed after passing through the DC blocking circuit.

The even harmonic superposition circuit processes the absolute value of the new sound signal with the DC component removed, for example, performs simple attenuation adjustment in amplitude, and superimposes the processed signal with the original signal.

On the basis of the device for improving the sound playback effect set above, referring to FIG. 6 , it shows an audio system according to an embodiment of the present invention, including the above device 103 for improving the sound playback effect and a load 102. The non-ideal transmission line 101 is connected between the device for improving the sound playing effect and the load. Since 101 is a non-ideal transmission line, it has certain equivalent resistance, equivalent inductance and distributed capacitance. The signal input part and the signal output part of the device for improving the sound playback effect are respectively located at different positions of the non-ideal transmission line, and the input part of the device for improving the sound playback effect is closer to the source end of the non-ideal transmission line, and is used to improve The output portion of the device that plays the sound effect is closer to the end of the non-ideal transmission line. Due to the existence of distributed parameters such as distributed resistance on the non-ideal transmission line, the even-order harmonics generated by the even-order harmonic superposition circuit can be mixed with the original signal, and the mixed signal is sent to the load circuit. The load circuit can be a speaker, It can also be a speaker or a frequency divider, or an amplifier or other audio equipment. After being processed by the device for improving the sound playing effect, the even harmonic component of the signal on the load is increased compared with the original sound signal, which plays a role in improving the auditory effect of the music.

It should be understood that the exemplary embodiments described herein are illustrative and not restrictive. Although one or more embodiments of the present invention have been described in conjunction with the drawings, it will be appreciated by those of ordinary skill in the art that various changes may be made without departing from the spirit and scope of the invention as defined by the appended claims. Changes in form and detail.

Claims (11)

1. A device for improving sound playing effect is characterized by comprising an isolation circuit, an even harmonic detection circuit, a DC blocking circuit and an even harmonic superposition circuit,

the isolation circuit is used for generating a new sound signal which has the same or opposite phase with the original sound signal, has the amplitude of 0.001-10000 times of the original sound signal and is electrically isolated from the original sound signal;

the even harmonic detection circuit is used for generating a signal which is output as the absolute value of a new sound signal by utilizing the unidirectional conductivity principle of the semiconductor device;

the DC blocking circuit is used for removing DC components in the signal of the absolute value of the new sound signal;

the even harmonic superposition circuit is used for processing the signal of the absolute value of the new sound signal with the DC component removed and superposing the processed signal and the original signal.

2. The apparatus for improving sound playback effect of claim 1, wherein the isolation circuit comprises a transformer.

3. The apparatus for improving a sound reproduction effect according to claim 1, wherein the even harmonic detection circuit includes four diodes, the cathode of the first diode and the anode of the second diode are connected together and connected to an output terminal of the isolation circuit, the cathode of the third diode and the anode of the fourth diode are connected together and connected to a further output terminal of the isolation circuit, the anodes of the first diode and the third diode are connected together and connected to an input terminal of the dc blocking circuit, and the cathode of the second diode and the anode of the fourth diode are connected together and connected to a reference terminal.

4. The apparatus for improving a sound playing effect according to claim 1, wherein the even harmonic detection circuit comprises four diodes, the cathode of the first diode and the anode of the second diode are connected together, the cathode of the third diode and the anode of the fourth diode are connected together, the anode of the first diode and the anode of the third diode are connected together, and the cathode of the second diode and the anode of the fourth diode are connected together.

5. The apparatus for improving a sound reproduction effect according to claim 1, wherein the even harmonic detection circuit includes two diodes, the cathode of the first diode and the cathode of the second diode are connected together and are connected to the input terminal of the dc blocking circuit, the anode of the first diode is connected to one output terminal of the isolation circuit, the anode of the second diode is connected to the other output terminal of the isolation circuit, and the center tap of the isolation circuit is connected to the reference terminal.

6. The apparatus for improving a sound reproduction effect according to claim 1, wherein the even harmonic detection circuit includes two diodes, the anode of the first diode and the anode of the second diode being connected together and to the input of the dc blocking circuit, the cathode of the first diode being connected to one output of the isolation circuit, the cathode of the second diode being connected to the other output of the isolation circuit, the center tap of the isolation circuit being connected to the reference terminal.

7. The apparatus for improving sound playback effect of claim 1, wherein the dc blocking circuit comprises a dc blocking capacitor.

8. The apparatus for improving a sound reproduction effect of claim 7, wherein the blocking capacitor has a capacity ranging from 10pF to 100F.

9. The apparatus for improving a sound playing effect according to claim 1, wherein the even harmonic superposition circuit comprises two resistors, a third resistor is connected to an output terminal of the blocking capacitor, the other end of the third resistor is connected to one end of the fourth resistor and then connected to one end of the load, and the other end of the fourth resistor is connected to the other end of the load.

10. The apparatus for improving a sound playing effect according to claim 9, wherein, the value of the third resistor ranges from 0 to 100MΩ, the value of the fourth resistor the range is 0- +++ Ω.

11. A sound system comprising a device for improving sound playback as claimed in any one of claims 1 to 10 and a load, the device for improving sound playback and the load being connected by a non-ideal transmission line.