TW202334941A - 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, and in particular, to a noise suppression volume control system and method that can effectively reduce discontinuous noise sounds during volume adjustment.

Audio electronics, in a broad sense, refers to a device that uses electronic circuit design to convert audio and electronic signals into each other. However, in general speaking, audio usually refers to the general term for all equipment used to play or record sound signals.

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

Under the traditional volume adjustment system, the volume adjustment will be adjusted according to the gain at 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 5dB. 20, so the traditional soft volume adjustment method for the above particles is idx 0, 5, 10, 15, and finally stops at 20; but the traditional volume adjustment method will cause the user's ears to appear based on the rate (for example, the rate is 0.2ms/6dB) Discontinuous noise will cause discomfort to the user's ears due to signal discontinuity during the volume adjustment process.

The main purpose of the present invention is to provide a noise suppression volume control system including 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 proportional signal. The discontinuous noise shaping volume adjusting device is disposed at the output end of the volume control device and receives the volume control signal. The discontinuous noise shaping and volume adjusting device includes a noise shaping module, a mapping module arranged at the output of the noise shaping module, and a volume adjustment module arranged at the output of the mapping module. The noise shaping module converts the received volume control signal and outputs it into a staircase wave signal, where the relationship between the output and input of the noise shaping module is as follows: ; ; in, This is the target - the value of the input gain proportional signal at nth order, is the value of the staircase wave signal at nth order, for and The intermediate transfer function, is a function of a multi-level quantizer; the mapping module outputs a plurality of volume adjustment signals based on the staircase wave signal, and the volume adjustment module adjusts the gain value of the original audio source signal based on the volume adjustment signal 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, which includes: the user operates the volume control device to cause the volume control device to 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 step wave signal and sends it to a mapping module, where the relationship between the output and input of the noise shaping module is as follows: Relationship: ; ;in, This is the target - the value of the input gain proportional signal at nth order, is the value of the staircase wave signal at nth order, for and The intermediate transfer function, 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 based on 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 conventional technology, the present invention can make the transient impact of adjusting the volume less obvious, and can make the user more comfortable when adjusting the volume.

The detailed description and technical content of the present invention are described below with reference to the drawings.

The following is a description of one of the preferred embodiments of the present invention. Please refer to "Figure 1" to "Figure 3", which are block schematic diagrams (1), block schematic diagram (2), and noise suppression volume control system of the present invention. The block diagram of the integer module is as shown in the figure:

The combination of devices, modules or units and their corresponding functions described in the noise suppression volume control system 100 of the present invention can be jointly executed by a single chip or a combination of multiple chips. The number of these chip configurations is not limited to this invention. the intended scope of the invention. In addition, the chip can be, but is not limited to, a processor (Processor), a Central Processing Unit (CPU), a microprocessor (Microprocessor), a Digital Signal Processor (DSP), a special application Application Specific Integrated Circuits (ASIC), Programmable Logic Device (PLD) and other similar devices or combinations of these devices that can process information or signals, convert them for special purposes, are used here. No limitations are imposed on 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 user operation. In the present invention, the volume control device 10 can (but is not limited to) be a digital signal processor (DSP) or a function signal generator (function signal generator). 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 a target-to-input gain ratio signal, for example.

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

The noise shaping module 22 converts and outputs the received volume control signal into a staircase 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 stage signal, and when the received volume control signal is a falling stage signal. When it is converted and output into a descending staircase wave signal. Please refer to "Figure 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. , the second multiplier M2, and the multi-level quantizer NQ. The input terminal of the 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 terminal is connected to the output of the first adder A1 and the output of the multi-level quantizer NQ, wherein an inverter is further included between the input terminal of the second adder A2 and the output of the first adder A1 (not shown) to form a subtraction loop; the input end 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 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 The output of the multi-level quantizer NQ forms a third-order delay loop; the input end of the multi-level quantizer NQ is connected to the output of the first adder A1, thereby converting the output of the first adder A1 (such as w[n]) into a quantized value, In a continuous state, a rising or falling step wave signal is eventually generated.

The first adder A1 and the second adder A2 may be, but are not limited to, an adder, a half adder, a full adder, a ripple carry adder, and a carry-ahead. Adder implementation, 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 may be, but are not limited to, integrators, counters, and other circuits that can be used for signal delay or integration, or a combination thereof. , is not limited in the present invention.

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

Please refer back to "Fig. 1", 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 is not limited to) a speaker, an electric speaker, a piezoelectric speaker, an electrode speaker, a plasma speaker, and other devices that can convert current frequency into sound, which are not limited in the present invention. .

The above describes a specific embodiment of the hardware architecture of the present invention. The working procedure of the present invention will be further described below. Please also refer to "Figure 4", which shows the noise suppression volume control method of the present invention. Process diagram:

First, the user operates the volume control device 10 and causes the volume control device 10 to 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 is not limited to a target-input gain ratio signal.

In this embodiment, the volume control signal may be a rising segment signal or a falling segment signal. In one embodiment, the rising segment signal may be a rising segment 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 value and waveform of the rising segment signal and the falling segment signal can be adjusted according to actual content and are not limited in the present invention.

Continuing, the noise shaping module 22 of the discontinuous noise shaping volume adjustment device 20 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. When the volume control signal is a falling segment signal, it is converted into a falling step wave signal and output to the mapping module 24 (step S202).

Please refer to "Figure 3" together. 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, This is the target - the value of the input gain proportional signal at nth order, 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. General formula two After substituting into equation 3, the following relationship can be obtained: ; (Formula 4)

Among them, the The function is as follows: ; (Formula 5) Among them, M is the preset level value of the multi-level 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 wave signal or descending staircase wave signal (step S203).

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

in, for the first The step wave signal input to the mapping module 24 in stages, for the first The volume adjustment signal output by 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 sound output device 30 (step S204).

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

in, For this mapping module 24th The volume adjustment signal is input to the volume adjustment module 26 in stages, for the first The original audio source signal OV that is input to the volume adjustment module 26 at a stage, For the volume adjustment module 26 on page The gain volume signal output by the stage.

Finally, the sound output device 30 receives the gain volume signal and converts the gain volume signal into audio output so that the user can hear it (step S205).

To sum up, compared with the conventional technology, the present invention can make the transient impact 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. However, what is described above is only one of the preferred embodiments of the present invention. It should not be used to limit the scope of the present invention, that is, any application based on the patent scope of the present invention shall be equal. Changes and modifications should still fall within the scope of the patent of the present invention.

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

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

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

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

Figure 4 is a schematic flow chart 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 shaping module

24: Mapping module

26: Volume adjustment module

30: Sound output device

OV: original audio signal

Claims (8)

A noise suppression volume control system includes: a volume control device that outputs a volume control signal according to user operation, and the volume control signal is a target-input gain proportional signal; a discontinuous noise integer volume adjustment device that is arranged on The output end of the volume control device receives the volume control signal, wherein the discontinuous noise shaping volume adjusting device includes a noise shaping module, a mapping module provided at the output of the noise shaping module, and a A volume adjustment module is provided at the output of the mapping module. The noise shaping module converts the received volume control signal and outputs it into a staircase wave signal. The relationship between the output and input of the noise shaping module is The following relationship: ; ; in, This is the target - the value of the input gain proportional signal at nth order, is the value of the staircase wave signal at nth order, for and The intermediate transfer function, is a function of a multi-level quantizer; the mapping module outputs a plurality of volume adjustment signals based on the staircase wave signal, and the volume adjustment module adjusts the gain value of the original audio source signal based on the volume adjustment signal and outputs a gain volume signal; and a The sound output device receives the gain volume signal and converts the gain volume signal into audio output. The noise suppression volume control system as described in claim 1, wherein the The function is as follows: ; Among them, M is the preset level value of the multi-level quantizer, and floor() is a floor function. The noise suppression volume control system as described in claim 1, wherein the mapping module maps and outputs the volume adjustment signal according to the following relationship: ; ; in, for The step wave signal input to the mapping module in stages, for the first The volume adjustment signal output by the stage mapping, Z is a positive integer, It is the preset volume gain unit. The noise suppression volume control system as described in claim 1, wherein the volume adjustment module outputs the gain volume signal according to the following relationship: ; in, For this mapping module The volume adjustment signal is input to the volume adjustment module in stages, for the first The original audio source signal that is input to the volume adjustment module at a stage, For this volume adjustment module, please refer to the The gain volume signal output by the stage. A noise suppression volume control method, including: the user operates a volume control device to cause the volume control device to 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 staircase wave signal and sends it to a mapping module, where the relationship between the output and input of the noise shaping module is as follows: ; ; in, This is the target - the value of the input gain proportional signal at nth order, is the value of the staircase wave signal at nth order, for and The intermediate transfer function, 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 based on 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. The noise suppression volume control method as described in claim 5, wherein the The function is as follows: ; Among them, M is the preset level value of the multi-level quantizer, and floor() is a floor function. The noise suppression volume control method as described in claim 5, wherein the mapping module maps and outputs the volume adjustment signal according to the following relationship: ; ; in, for the first The step wave signal input to the mapping module in stages, for the first The volume adjustment signal output by the stage mapping, Z is a positive integer, It is the preset volume gain unit. The noise suppression volume control method as described in claim 5, wherein the volume adjustment module outputs the gain volume signal according to the following relationship: ; in, For this mapping module The volume adjustment signal is input to the volume adjustment module in stages, for the first The original audio source signal that is input to the volume adjustment module at a stage, For this volume adjustment module, please refer to the The gain volume signal output by the stage.

Images