TWI809728B - Noise reduction volume control system and method - Google Patents

Abstract

The present invention provides a noise reduction volume control system, which comprises a volume control device, a discontinuous noise shaping volume adjustment device, and a voice output device. The volume control device outputs a volume control signal according to user’s operation. The discontinuous noise shaping volume adjustment device comprises a noise shaping module, a mapping module, and a volume adjustment module. The noise shaping module transfers the volume control signal to a stair-step signal. The mapping module outputs a plurality of volume gaining signal according to the stair-step signal. The volume adjustment module adjusts an original voice signal according to the gaining signal and output a gain volume signal. The voice output device receives the gain volume signal and thereby outputs a voice.

Description

Noise suppression volume control system and method

The present invention relates to a noise suppression volume control system and method, in particular to a noise suppression volume control system and method that can effectively reduce discontinuous noise sounds during volume adjustment.

Audio (Audio electronics) broadly refers to a device that uses electronic circuit design to convert between audio and electronic signals, but in general colloquial terms, audio usually refers to the general term for all devices used to play or record sound signals.

With the development of technology, people have higher and higher requirements for entertainment quality. For example, people will seek clearer sound quality, so there are many improvements in audio, and there is even a need for comfort during the volume adjustment process.

Under the traditional volume adjustment system, the volume adjustment will be adjusted according to the gain according to the adjustment rate. For a specific example, if the volume is to be adjusted from 0dB to 5dB, the corresponding gain index must be gradually adjusted from 0 to 20, so the traditional soft volume adjustment method of the above particles is idx 0, 5, 10, 15, and finally stops at 20; but in the traditional volume adjustment method, the user's ear will appear according to the rate (for example, the rate is 0.2ms/6dB). Discontinuous noise, this method will cause discomfort to the user's ears due to the discontinuous signal during the volume adjustment process.

The main purpose of the present invention is to provide a noise suppression volume control system comprising a volume control device, a discontinuous noise shaping volume adjustment device, and a sound output device. The volume control device outputs a volume control signal according to user operation, and the volume control signal is a target-input gain ratio signal. The discontinuous noise shaping volume adjustment device is arranged at the output end of the volume control device and receives the volume control signal. Wherein the discontinuous noise shaping volume adjustment device includes a noise shaping module, a mapping module set at the output of the noise shaping module, and a volume adjusting module set at the output of the mapping module, the The noise shaping module converts the received volume control signal and outputs it as a ladder wave signal, wherein the relationship between the output and input of the noise shaping module is as follows: ; ; in, For this target - enter the value of the gain proportional signal at order n, is the value of the staircase wave signal at nth order, for and The intermediate transfer function, It is a function of a multi-level quantizer; the mapping module outputs a plurality of volume adjustment signals according to the ladder wave signal, and the volume adjustment module adjusts the gain value of the original audio source signal according to the volume adjustment signals and outputs a gain volume signal. The sound output device receives the gain volume signal and converts the gain volume signal into audio output.

Another object of the present invention is to provide a noise suppression volume control method, including: the user operates the volume control device to make the volume control device output a volume control signal to a discontinuous noise shaping volume adjustment device; the discontinuous noise The noise shaping module of the shaping volume adjustment device converts the received volume control signal into a ladder wave signal and sends it to a mapping module, wherein the output and input of the noise shaping module are as follows Relational formula: ; ;in, For this target - enter the value of the gain proportional signal at order n, is the value of the staircase wave signal at nth order, for and The intermediate transfer function, It is a function of a multi-level quantizer; the mapping module sequentially maps and outputs a plurality of volume adjustment signals to a volume adjustment module according to the received step wave signal; the volume adjustment module adjusts the gain of an original audio source signal value and output a gain volume signal to a sound output device.

Compared with the prior art, the present invention can make the transient effect of adjusting the volume less obvious, and can make the user more comfortable when adjusting the volume.

The detailed description and technical contents of the present invention are described as follows with respect to the accompanying drawings.

One of the preferred embodiments of the present invention will be described below, please refer to "Fig. 1" to "Fig. 3", which are the block diagram (1), block diagram (2) and noise suppression volume control system of the present invention. The block diagram of the integer module is shown in the figure:

The combination of devices, modules or units described in the noise suppression volume control system 100 of the present invention and the corresponding functions thereof can be performed by a single chip or a combination of multiple chips, and the number of these chip configurations is not included in this document. The scope of the invention is intended to be limited. In addition, the chip can be, but not limited to, a processor (Processor), a central processing unit (Central Processing Unit, CPU), a microprocessor (Microprocessor), a digital signal processor (Digital Signal Processor, DSP), special application Integrated circuits (Application Specific Integrated Circuits, ASIC), programmable logic devices (Programmable Logic Device, PLD) and other similar devices that can process, convert or special-purpose information or signals, or combinations of these devices, are described in this No limitation is intended in the invention.

The noise suppression volume control system 100 of the present invention mainly includes a volume control device 10 , a discontinuous noise shaping volume adjustment device 20 , and a sound output device 30 .

The volume control device 10 outputs a volume control signal according to the user's operation. In the present invention, the volume control device 10 can be (but not limited to) a digital signal processor (digital signal processor, DSP), function signal generator (function generator), Arbitrary waveform generators (Arbitrary waveform generators, AWG), signal generators (Signal generator) and other devices that can generate signals are not limited in the present invention. Specifically, the volume control signal may be, for example, a target-input gain ratio signal.

The discontinuous noise shaping volume adjustment device 20 is set at the output end of the volume control device 10 to receive the volume control signal and the original audio signal OV provided by the microphone or the storage device. In this embodiment, please refer to "Fig. 2", the aforementioned noise shaping type volume adjustment device 20 includes a noise shaping module 22, a mapping module 24 set at the output of the noise shaping module 22, and a setting The volume adjustment module 26 output by the mapping module 24 .

The noise shaping module 22 converts the received volume control signal into a ladder wave signal. Specifically, the noise shaping module 22 converts and outputs the received volume control signal into a rising step wave signal when the received volume control signal is a rising segment signal, and when the received volume control signal is a falling segment signal When it is converted and output as a descending ladder wave signal. Please refer to "Fig. 3", the noise shaping module 22 includes a first adder A1, a second adder A2, a first delayer D1, a second delayer D2, a third delayer D3, and a first multiplier M1 , a second multiplier M2, and a multi-scale quantizer NQ. The input end of this first adder A1 is connected to the output of the volume control device 10, the output of the first multiplier M1, the output of the second multiplier M2, and the output of the third delayer D3; the output of the second adder A2 The input end is connected to the output of the first adder A1 and the output of the multi-scale quantizer NQ, wherein an inverter is further included between the input end of the second adder A2 and the output of the first adder A1 (not shown) to form a subtraction loop; the input of the first delayer D1 is connected to the output of the second adder A2, and the input of the first multiplier M1 is connected to the output of the first delayer D1 to form A first-order delay feedback loop; the input end of the second delayer D2 is connected to the output of the first delayer D1, and the input of the second multiplier M2 is connected to the output of the second delayer D2 to form a second-order delay loop , wherein the output of the second multiplier M2 and the first adder A1 further include an inverter (not shown) to form a subtraction loop; the input end of the third delayer D3 is connected to the second delayer D2 to form a third-order delay loop; the input of the multi-level quantizer NQ is connected to the output of the first adder A1, so as to convert the output of the first adder A1 (for example, w[n]) into a quantized value, In the continuous state, a rising or falling step wave signal is finally generated.

The first adder A1 and the second adder A2 can be but not limited to adder (Adder), half adder (Half Adder), full adder (Full adder), ripple carry adder, advanced carry Implementations of adders, or other digital circuits, logic gates, or combinations thereof for performing addition operations are not limited in the present invention.

The first delayer D1, the second delayer D2, and the third delayer D3 can be but not limited to integrators (Integrators), counters (Counters) and other circuits that can be used for signal delay or integration purposes or combinations thereof , is not limited in the present invention.

The first multiplier M1 and the second multiplier M2 may be but not limited to operational amplifiers (op amp), or circuits composed of a plurality of adders, or other similar devices, which are not included in the present invention limit.

Please refer to FIG. 1 again, the sound output device 30 receives the gain volume signal and converts the gain volume signal into audio output. The sound output device 30 can be (but not limited to) a device that can convert current frequency into sound, such as a speaker, an electrodynamic speaker, a piezoelectric speaker, an electrode speaker, a plasma speaker, etc., and is not limited in the present invention. .

The above is a description of a specific embodiment of the hardware architecture of the present invention. The working program of the present invention will be further described below. Please refer to "Fig. 4", which is the description of the noise suppression volume control method of the present invention. Schematic diagram of the process:

First, the user operates the volume control device 10 to make the volume control device 10 output a volume control signal to the discontinuous noise shaping volume adjustment device 20 (step S201 ). Specifically, the volume control signal may be, for example but not limited to, a target-input gain ratio signal.

In this embodiment, the volume control signal may be an ascending signal or a descending signal. In one embodiment, the ascending signal may be an ascending range from 0 (minimum) to 1 (maximum), so In one embodiment, the falling segment signal may be a falling interval between 1 (maximum) and 0 (minimum). In other embodiments, the peak values and waveforms of the rising signal and the falling signal can be adjusted according to actual content, which is not limited in the present invention.

Next, the noise shaping module 22 of the discontinuous noise shaping volume adjustment device 20 converts and outputs the received volume control signal to a rising step wave signal when the received volume control signal is a rising segment signal, and when the received volume control signal When the volume control signal is a descending segment signal, it is converted and output as a descending ladder wave signal to the mapping module 24 (step S202 ).

Please also refer to "Fig. 3", in this embodiment, the relationship between the output and input of the noise shaping module 22 is as follows: ; (Formula 1) ; (Formula 2) ; (Formula 3) Among them, For this target - enter the value of the gain proportional signal at order n, is the value of the staircase wave signal at nth order, for and the intermediate transfer function (also the output of the first adder A1), is the output of the second adder A2. Will formula two After substituting Equation 3, the following relationship can be obtained: ; (Formula 4)

Among them, the The function is as follows: ; (Formula 5) Wherein, M is the preset scale value of the multi-scale quantizer NQ, and floor() is a floor function.

Next, the mapping module 24 sequentially maps and outputs a plurality of volume adjustment signals to the volume adjustment module 26 according to the received ascending staircase signal or descending staircase signal (step S203 ).

In this embodiment, the mapping module 24 maps and outputs the volume adjustment signal according to the following relational expression: ; ;

in, for the first step input to the step wave signal of the mapping module 24, for the first The volume adjustment signal output by the stage mapping, Z is a positive integer, It is the preset volume gain unit (dB).

Next, the volume adjustment module 26 adjusts the gain value of the original audio source signal OV and outputs the gain volume signal to the audio output device 30 (step S204 ).

The volume adjustment module 26 outputs the gain volume signal according to the following relational expression: ;

in, For the mapping module 24 stage input to the volume adjustment signal of the volume adjustment module 26, for the first The original audio source signal OV input to the volume adjustment module 26 in stages, For the volume adjustment module 26 on the The gain volume signal output by the stage.

Finally, the audio output device 30 receives the gain volume signal and converts the gain volume signal into an audio output for the user to hear (step S205 ).

To sum up, compared with the conventional technology, the present invention can make the transient effect of adjusting the volume less obvious, and can make the user more comfortable when adjusting the volume.

The present invention has been described in detail above, but the above is only one of the preferred embodiments of the present invention, and should not limit the scope of the present invention with this, that is, all equivalents made according to the patent scope of the present invention Changes and modifications should still fall within the scope of the patent coverage of the present invention.

100: Noise suppression volume control system 10: Volume control device 20: Discontinuous noise shaping volume adjustment device 22: Noise integer module 24: Mapping Module 26:Volume adjustment module 30: Sound output device OV: original audio signal A1: first adder A2: Second adder D1: the first delay D2: second delay D3: The third delay M1: the first multiplier M2: second multiplier NQ: multi-scale quantizer S201~S205: steps

FIG. 1 is a schematic block diagram (1) of the noise suppression volume control system of the present invention.

FIG. 2 is a schematic block diagram (2) of the noise suppression volume control system of the present invention.

FIG. 3 is a schematic block diagram of the noise shaping module of the present invention.

FIG. 4 is a schematic flowchart of the noise suppression volume control method of the present invention.

100: Noise suppression volume control system

10: Volume control device

20: Discontinuous noise shaping volume adjustment device

22: Noise integer module

24: Mapping Module

26:Volume adjustment module

30: Sound output device

OV: original audio signal

Claims (2)

A noise suppression volume control system, comprising: a volume control device, which outputs a volume control signal according to user operations, and the volume control signal is a target-input gain ratio signal; a discontinuous noise shaping volume adjustment device, which is set on The output terminal of the volume control device receives the volume control signal, wherein the discontinuous noise shaping volume adjustment device includes a noise shaping module, a mapping module set at the output of the noise shaping module, and a The volume adjustment module installed at the output of the mapping module, the noise shaping module converts the received volume control signal and outputs it as a ladder wave signal, wherein the output and input of the noise shaping module are connected by The following relationship: y[n]=Nbits_Quantizer(w[n]);

w[n]=x[n]+(y[n-3]-w[n-3])-3×(y[n-2]-w[n-2])+3×(y[n -1]-w[n-1]); Among them, x[n] is the value of the target-input gain proportional signal at n times, y[n] is the value of the step wave signal at n steps, w [n] is the transfer function between x[n] and y[n], Nbits_Quantizer( ) is the function of the multi-level quantizer, M is the preset value of the multi-level quantizer, floor( ) is a floor function ; The mapping module outputs a plurality of volume adjustment signals according to the ladder wave signal, and the volume adjustment module adjusts the gain value of the original audio source signal according to the volume adjustment signal and outputs a gain volume signal; wherein the mapping module is based on the following relationship Output the volume adjustment signal by mapping: if y[n]

2 ^{( Z -1)} ,d[n]=[-(2 ^{( Z -1)} -y[n])]×α; if y[n]>2 ^{( Z -1)} ,d[n]=[ 2 ^{( Z -1)} +(y[n]-2 ^Z )]×α; where, y[n] is the step wave signal input to the mapping module in n stages, and d[n] is the nth stage mapping For the output volume adjustment signal, Z is a positive integer, and α is a preset volume gain unit; wherein, the volume adjustment module outputs the gain volume signal according to the following relational formula:

Wherein, d[n] is the volume adjustment signal input to the volume adjustment module at the nth stage of the mapping module, m[n] is the original audio source signal input to the volume adjustment module at the nth stage, v[ n] is the gain volume signal output by the volume adjustment module in the nth stage; and a sound output device, which receives the gain volume signal and converts the gain volume signal into an audio output. A noise suppression volume control method, comprising: a user operates a volume control device to make the volume control device output a volume control signal to a discontinuous noise shaping volume adjustment device; the noise of the discontinuous noise shaping volume adjustment device The shaping module converts the received volume control signal into a ladder wave signal and sends it to a mapping module, wherein the output and input of the noise shaping module are in the following relationship: y[n]= Nbits_Quantizer(w[n]);

w[n]=x[n]+(y[n-3]-w[n-3])-3×(y[n-2]-w[n-2])+3×(y[n -1]-w[n-1]); Among them, x[n] is the value of the target-input gain proportional signal at n-order, y[n] is the value of the step wave signal at n-order, w[ n] is the transfer function between x[n] and y[n], Nbits_Quantizer( ) is the function of the multi-level quantizer, M is the preset scale value of the multi-level quantizer, and floor( ) is a floor function; The mapping module sequentially maps and outputs a plurality of volume adjustment signals to a volume adjustment module according to the received step wave signal; wherein, the mapping module maps and outputs the volume adjustment signals according to the following relational formula: if y [n]

2 ^{( Z -1)} ,d[n]=[-(2 ^{( Z -1)} -y[n])]×α; if y[n]>2 ^{( Z -1)} ,d[n]=[ 2 ^{( Z -1)} +(y[n]-2 ^Z )]×α; where, y[n] is the step wave signal input to the mapping module at the nth stage, and d[n] is the nth stage The volume adjustment signal output by mapping, Z is a positive integer, and α is a preset volume gain unit; wherein, the volume adjustment module outputs the gain volume signal according to the following relational formula:

Among them, d[n] is the volume adjustment signal input to the volume adjustment module in the nth stage of the mapping module, m[n] is the original audio source signal input to the volume adjustment module in the nth stage, v[ n] is the gain volume signal output by the volume adjustment module in the nth stage; and the volume adjustment module adjusts the gain value of an original audio source signal and outputs a gain volume signal to a sound output device.

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