CN209151233U - A kind of voice noise elimination and noise reduction co-design circuit - Google Patents
A kind of voice noise elimination and noise reduction co-design circuit Download PDFInfo
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- CN209151233U CN209151233U CN201821858461.2U CN201821858461U CN209151233U CN 209151233 U CN209151233 U CN 209151233U CN 201821858461 U CN201821858461 U CN 201821858461U CN 209151233 U CN209151233 U CN 209151233U
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Abstract
The utility model discloses a kind of voice noise eliminations and noise reduction co-design circuit, it is characterized in that, the analog voice signal of demodulation input is received including AGC module, after carrying out AGC processing, analog-to-digital conversion is carried out by ADC converter, analog voice signal is become into audio digital signals, digital signal is input in FPGA module by DSP module by I2S, noise reduction process is carried out to audio digital signals using FPGA module, and the voice signal after noise reduction process is passed back in DSP module by digital audio interface I2S, after the DSP module receives the voice signal of passback, voice signal is divided into two-way, wherein voice signal utilizes the speech identifying function of the chip to realize noise elimination function all the way, and noise elimination indication signal is exported by GPIO1 interface, another way voice signal is logical Wave digital lowpass filter is crossed, the out-of-band high-frequency noise of voice is filtered, filtered signal prevents distorsion caused by accidentally receiving big signal by a DRC component.
Description
Technical field
The utility model relates to a kind of machine noise elimination and noise reduction joint circuits, and in particular to a kind of voice noise elimination is combined with noise reduction
Design circuit.
Background technique
With the development of aviation industry, China is gradually strided forward from aviation big country to aviation power, meanwhile, ground-air communication equipment
Also the stronger market demand has been welcome, and voice communication is exactly one of most important means of communication of ground-air communication equipment.It is existing
Ground-air communication equipment receiving path as shown in Figure 1, demodulation voice is sent into noise reduction module after ADC is sampled, send all the way by noise reduction output
It is exported after DAC, enters noise elimination module all the way.Noise elimination module detects the voice after noise reduction, controls unlatching and the pass of output module
It closes.The circuit components quantity is more, and design is complicated, is unfavorable for minimizing.
Utility model content
It is more that technical problem to be solved in the utility model is that the present invention can solve traditional circuit component number, and design is multiple
It is miscellaneous and the problem of be unfavorable for miniaturization, and it is an object of the present invention to provide a kind of voice noise elimination and noise reduction co-design circuit, solve above-mentioned
Problem.
The utility model is achieved through the following technical solutions:
A kind of voice noise elimination and noise reduction co-design circuit, which is characterized in that receive demodulation input including AGC module
Analog voice signal after carrying out AGC processing, carries out analog-to-digital conversion by ADC converter, analog voice signal is become digital language
Digital signal is input in FPGA module by sound signal, DSP module by I2S, using FPGA module to audio digital signals into
Row noise reduction process, and the voice signal after noise reduction process is passed back in DSP module by digital audio interface I2S, the DSP
After module receives the voice signal of passback, voice signal is divided into two-way, wherein voice signal utilizes the language of the chip all the way
Sound identification function realizes noise elimination function, and exports noise elimination indication signal by GPIO1 interface, and another way voice signal passes through number
Low-pass filter, filters the out-of-band high-frequency noise of voice, and filtered signal prevents from accidentally connecing by a DRC component
Distorsion caused by big signal is received, treated, and signal is amplified by a digital amplifier, is then passed through DAC and is counted
Mould conversion process, and export analog voice signal.
In current aviation industry, the voice process technology of the air-ground communication apparatus in China is more perfect, but
It is not integrated, noise reduction module and the separation of noise elimination module are larger, and need effectively to connect.So leading to existing electricity
Road device component is more, and design is also very complicated, is unfavorable for minimizing.And the simple miniaturized circuit of structure, in aviation industry
With extensive, many small aircrafts require to be minimized, and are installed convenient for these modules.Present specification is by noise elimination
It is combined with noise reduction module, and uses the processing that an individually designed chip carries out voice module, can be dropped
It makes an uproar and the two different operations of noise elimination.
Further, in the analog voice signal exported after DAC carries out analog-to-digital conversion process, pass through RC filter circuit
And it is exported again after the adjusting gain of digital volume adjusting knob.
Further, the voice signal after FPGA module noise reduction is compared with primary speech signal, and signal-to-noise ratio can promote 3~
10dB。
Further, the gain of the digital amplifier is 17dB.
Further, the wave digital lowpass filter arrives 3400Hz frequency 0, and opposite 1000Hz variation is no more than+-
0.1dB, when frequency is in 4000Hz frequencies above, decaying is more than or equal to 30dB.
The utility model compared with prior art, has the following advantages and benefits:
1, a kind of voice noise elimination of the utility model and noise reduction co-design circuit carry out noise reduction process to voice and are not limited to
Using FPGA, voice de-noising processing can be used any programmable processor and be handled, can be simultaneously in same processor
Noise elimination and noise reduction process are carried out, complicated circuit is rearranged, is conducive to carry out integrated circuit, be convenient for circuit module
It is minimized.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the utility model embodiment, constitutes the one of the application
Part does not constitute the restriction to the utility model embodiment.In the accompanying drawings:
Fig. 1 is that existing ground-air communication equipment demodulates voice output access figure.
Fig. 2 is that the utility model voice noise elimination and noise reduction co-design circuit realize block diagram.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below with reference to embodiment and attached drawing,
The utility model is described in further detail, and the exemplary embodiment and its explanation of the utility model are only used for explaining this
Utility model is not intended to limit the scope of the present invention.
Embodiment
As shown in Fig. 1~2, a kind of voice noise elimination of the utility model and noise reduction co-design circuit, which is characterized in that including
AGC module receives the analog voice signal of demodulation input, after carrying out AGC processing, carries out analog-to-digital conversion by ADC converter,
Analog voice signal is become into audio digital signals, digital signal is input in FPGA module by DSP module by I2S, is utilized
FPGA module carries out noise reduction process to audio digital signals, and the voice signal after noise reduction process is passed through digital audio interface
I2S passes back in DSP module, and after the DSP module receives the voice signal of passback, voice signal is divided into two-way, wherein
Voice signal realizes noise elimination function using the speech identifying function of the chip all the way, and exports noise elimination instruction by GPIO1 interface
Signal, another way voice signal filter the out-of-band high-frequency noise of voice by wave digital lowpass filter, filtered signal,
Distorsion caused by accidentally receiving big signal is prevented by a DRC component, treated, and signal passes through a number amplification
Device amplifies, and is then passed through DAC and carries out digital-to-analogue conversion processing, and exports analog voice signal.
In current aviation industry, the voice process technology of the air-ground communication apparatus in China is more perfect, but
It is not integrated, noise reduction module and the separation of noise elimination module are larger, and need effectively to connect.So leading to existing electricity
Road device component is more, and design is also very complicated, is unfavorable for minimizing.And the simple miniaturized circuit of structure, in aviation industry
With extensive, many small aircrafts require to be minimized, and are installed convenient for these modules.Present specification is by noise elimination
It is combined with noise reduction module, and uses the processing that an individually designed chip carries out voice module, can be dropped
It makes an uproar and the two different operations of noise elimination.
As shown in Figure 1, choosing whether firstly, voice data is directly carried out noise reduction after ADC analog-to-digital conversion
It needs to carry out noise elimination, if desired carries out noise elimination, then do not have to export after converting by DAC, if not needing to carry out noise elimination, by voice
Data are exporting after again passing by DAC module conversion, and mode at user option in this way is limited, and are merely able to after progress noise reduction
It can be with noise elimination.Existing ground-air communication equipment receiving path is sent into noise reduction module after ADC is sampled as shown in Figure 1, demodulating voice,
Noise reduction output exports after sending DAC all the way, enters noise elimination module all the way.Noise elimination module detects the voice after noise reduction, control output mould
The open and close of block, the circuit components quantity is more, and design is complicated, is unfavorable for minimizing.
As shown in Fig. 2, firstly, after TLV320AIC3268 chip carries out AGC processing to the analog voice signal of input, AGC
After processing, by the ADC converter of the integrated chip, analog to digital conversion is carried out, analog voice signal is become into audio digital signals,
And FPGA is output to by digital audio interface I2S_DOUT_L.Then, audio digital signals are carried out at noise reduction using FPGA
It manages, the voice signal after noise reduction process transfers back to TLV320AIC3268 chip interior by digital audio interface I2S_DIN_L
In miniDSP, voice signal is divided into two-way in miniDSP, wherein voice signal utilizes the speech recognition of the chip all the way
Function realizes noise elimination function, and exports noise elimination indication signal by GPIO1 interface, and another way voice signal is filtered by digital lowpass
Wave device, filtering the out-of-band high-frequency noise of voice, (low pass filter design index: 0 arrives 3400Hz frequency, and opposite 1000Hz becomes
Change and is no more than+- 0.1dB；4000Hz frequencies above, decaying are more than or equal to 30dB), filtered signal passes through a DRC component
It prevents distorsion caused by accidentally receiving big signal, plays the role of protecting loudspeaker that (DRC target gate is 79.5mV, is more than
Compression ratio after thresholding is 4:1), treated, and signal is amplified by a digital amplifier (gain 17dB), then
DAC by chip interior carries out digital-to-analogue conversion processing, and exports analog voice signal.Finally, the analog voice of output is believed
It is exported after number adjusting gain by RC filter circuit and digital volume adjusting knob.Voice and original after FPGA noise reduction
Beginning voice is compared, and signal-to-noise ratio can promote 3~10dB.
In the analog voice signal exported after DAC carries out analog-to-digital conversion process, pass through RC filter circuit and number
Volume adjustment knob is exported again after adjusting gain.
For voice signal after FPGA module noise reduction compared with primary speech signal, signal-to-noise ratio can promote 3~10dB.
The gain of the digital amplifier is 17dB.Gain is that 17dB is preferred parameter, can after being amplified by the gain
Convenient processing voice data, makes voice data relatively sharp,
The wave digital lowpass filter arrives 3400Hz frequency 0, and opposite 1000Hz variation is no more than+- 0.1dB, works as frequency
In 4000Hz frequencies above, decaying is more than or equal to 30dB.
Key point of the invention and protection point are the miniaturization noise elimination drops combined using TLV320AIC3268 with FPGA
It makes an uproar co-design.But it carries out noise reduction process to voice to be not limited to using FPGA, voice de-noising processing can be used any programmable
Processor and chip with this kind of function are realized.Noise elimination and noise reduction co-design circuit are also not limited to TLV320AIC3268
Chip is connected with FPGA, and any design for being able to achieve miniaturization all should be in scope of patent protection, and the interface of they and FPGA
It is also not limited to I2S, any interface for being able to achieve data transmission all should be in the protection scope of patent.
Above-described specific embodiment, to the purpose of this utility model, technical scheme and beneficial effects carried out into
One step is described in detail, it should be understood that being not used to limit the foregoing is merely specific embodiment of the present utility model
Determine the protection scope of the utility model, within the spirit and principle of the utility model, any modification for being made equally is replaced
It changes, improve, should be included within the scope of protection of this utility model.
Claims (5)
1. a kind of voice noise elimination and noise reduction co-design circuit, which is characterized in that receive the mould of demodulation input including AGC module
Quasi- voice signal after carrying out AGC processing, carries out analog-to-digital conversion by ADC converter, analog voice signal is become digital speech
Digital signal is input in FPGA module by signal, DSP module by I2S, is carried out using FPGA module to audio digital signals
Noise reduction process, and the voice signal after noise reduction process is passed back in DSP module by digital audio interface I2S, the DSP mould
After block receives the voice signal of passback, voice signal is divided into two-way, wherein voice signal utilizes the voice of the chip all the way
Identification function realizes noise elimination function, and exports noise elimination indication signal by GPIO1 interface, and another way voice signal is low by number
Bandpass filter, filters the out-of-band high-frequency noise of voice, and filtered signal prevents from accidentally receiving by a DRC component
To distorsion caused by big signal, treated, and signal is amplified by a digital amplifier, is then passed through DAC and is carried out digital-to-analogue
Conversion process, and export analog voice signal.
2. a kind of voice noise elimination according to claim 1 and noise reduction co-design circuit, which is characterized in that passing through DAC
The analog voice signal exported after analog-to-digital conversion process is carried out, is adjusted and is increased by RC filter circuit and digital volume adjusting knob
It is exported again after benefit.
3. a kind of voice noise elimination according to claim 1 and noise reduction co-design circuit, which is characterized in that FPGA module drop
For voice signal after making an uproar compared with primary speech signal, signal-to-noise ratio can promote 3~10dB.
4. a kind of voice noise elimination according to claim 1 and noise reduction co-design circuit, which is characterized in that the number is put
The gain of big device is 17dB.
5. a kind of voice noise elimination according to claim 1 and noise reduction co-design circuit, which is characterized in that the number is low
Bandpass filter arrives 3400Hz frequency 0, and opposite 1000Hz variation is no more than+- 0.1dB, when frequency is in 4000Hz frequencies above, declines
Subtract and is more than or equal to 30dB.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953572A (en) * | 2021-01-22 | 2021-06-11 | 成都天奥信息科技有限公司 | Low-delay small-jitter radio station squelch method |
| CN113131965A (en) * | 2021-04-16 | 2021-07-16 | 成都天奥信息科技有限公司 | Civil aviation very high frequency ground-air communication radio station remote control device and voice discrimination method |
-
2018
- 2018-11-12 CN CN201821858461.2U patent/CN209151233U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953572A (en) * | 2021-01-22 | 2021-06-11 | 成都天奥信息科技有限公司 | Low-delay small-jitter radio station squelch method |
| CN112953572B (en) * | 2021-01-22 | 2022-08-02 | 成都天奥信息科技有限公司 | Low-delay small-jitter radio station squelch method |
| CN113131965A (en) * | 2021-04-16 | 2021-07-16 | 成都天奥信息科技有限公司 | Civil aviation very high frequency ground-air communication radio station remote control device and voice discrimination method |
| CN113131965B (en) * | 2021-04-16 | 2023-11-07 | 成都天奥信息科技有限公司 | Civil aviation very high frequency ground-air communication radio station remote control device and voice discrimination method |
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