CN106887234A - A kind of speech signal pre-processing system - Google Patents
A kind of speech signal pre-processing system Download PDFInfo
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- CN106887234A CN106887234A CN201510935721.6A CN201510935721A CN106887234A CN 106887234 A CN106887234 A CN 106887234A CN 201510935721 A CN201510935721 A CN 201510935721A CN 106887234 A CN106887234 A CN 106887234A
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- 238000007781 pre-processing Methods 0.000 title claims abstract description 15
- 230000009466 transformation Effects 0.000 claims description 3
- 230000005236 sound signal Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/26—Pre-filtering or post-filtering
- G10L19/265—Pre-filtering, e.g. high frequency emphasis prior to encoding
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
- G10L21/0324—Details of processing therefor
- G10L21/0332—Details of processing therefor involving modification of waveforms
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/0316—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude
- G10L21/0364—Speech enhancement, e.g. noise reduction or echo cancellation by changing the amplitude for improving intelligibility
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- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Quality & Reliability (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention belongs to field of electric control, and in particular to a kind of speech signal pre-processing system, including the microphone of unidirectional connection, phonetic entry processing module, converter and the D/A converter, voice output processing module, the loudspeaker that unidirectionally connect successively successively；Phonetic entry processing module in the present invention can prevent the distortion of voice signal, while the audio signal of below 50HZ and more than 2000HZ can be filtered out；And voice output processing module can increase driving force, and only amplify in the range of 50HZ ~ 2000HZ and have tuner frequently, while preventing causes of sound distortion.
Description
Technical field
The invention belongs to field of electric control, and in particular to a kind of speech signal pre-processing system.
Background technology
, it is necessary to the analog signal that microphone is collected is data signal by AD conversion in digital communication, while be also required to data signal to be converted to analog signal by DA and being conveyed to loudspeaker and sending sound.
Usually used scheme is that microphone input signal is gathered after discharge circuit amplifies by AD, and voice signal is converted into data signal, and so directly conversion can cause audio distortions, while useless low frequency signal and high-frequency signal can not be filtered；And after data signal is converted to voice signal, rear drive the speaker is directly amplified to DA output signals, so directly going drive the speaker to send sound can cause driving force poor, and sound is small, while gain can not be adjusted.
The content of the invention
The purpose of the present invention is the disadvantages mentioned above for overcoming prior art, there is provided a kind of speech signal pre-processing system.
To achieve these goals, the technical solution adopted in the present invention is：A kind of speech signal pre-processing system, including the microphone of unidirectional connection, phonetic entry processing module, converter and the D/A converter, voice output processing module, the loudspeaker that unidirectionally connect successively successively,
The input of isolating transformer T1 in the microphone connection phonetic entry processing module；The output end of the isolating transformer T1 connects one end of resistance R2 by capacitance C1, the reverse input end of the other end concatenation operation amplifier U1B of resistance R2, resistance R1 is the negative feedback resistor of operational amplifier U1B, the output end and reverse input end of concatenation operation amplifier U1B；The output end of the isolating transformer T1 also connects one end of resistance R5, the positive input of the other end concatenation operation amplifier U1B of resistance R5 by capacitance C4, while the positive input of operational amplifier U1B passes through resistance R6 and electric capacity C5 earths；The output end of the isolating transformer T1 is parallel with resistance R8；The output end of the operational amplifier U1B is connected to one end of resistance R3 by capacitance C2；The reverse input end of the other end concatenation operation amplifier U2B of the resistance R3；The positive input of the operational amplifier U2B is grounded by resistance R7；The slide rheostat RP1 for operational amplifier U2B negative feedback resistor, the output end and reverse input end of this resistance concatenation operation amplifier U2B, feedback resistance is adjustable；The output end of the operational amplifier U2B is connected to one end of resistance R4 by electric capacity C3；The other end connection converter of the resistance R4；
The voice signal of the D/A converter output is connected to one end of resistance R10 by the capacitance C6 in voice output processing module；The inverting input of the other end concatenation operation amplifier U3B of the resistance R10；The positive input of the operational amplifier U3B is grounded by resistance R17；The slide rheostat RP2 negative feedback resistors that forms operational amplifier U3B in parallel with electric capacity C7, feeds back adjustable；The output end of the operational amplifier U3B is connected to one end of resistance R9 by electric capacity C9；The positive input of the other end difference concatenation operation amplifier U4B of the resistance R9 and one end of resistance R12；The other end ground connection of the resistance R12；The output end of the operational amplifier U4B is connected to the input of isolating transformer T2 by resistance R11；The reverse input end and output end of the operational amplifier U4B are directly connected to form voltage follower, and the output end of operational amplifier U4B passes through the reverse input end of resistance R13 concatenation operation amplifiers U5B；The positive input of the operational amplifier U5B is grounded by resistance R16；The resistance R14 negative feedback resistors that forms operational amplifier U5B in parallel with electric capacity C8；The output end of operational amplifier U5B is connected by resistance R15 with another input of isolating transformer T2；The output end connection loudspeaker of the isolating transformer T2.
A kind of above-mentioned speech signal pre-processing system, the transformation ratio of the isolating transformer T1 and T2 is 1:1.
A kind of above-mentioned speech signal pre-processing system, the secondary middle lead-out wire of output end of the isolating transformer T1 and the secondary middle lead-out wire of input of isolating transformer T2 are grounded.
Beneficial effects of the present invention：Phonetic entry processing module in the present invention can prevent the distortion of voice signal, while the audio signal of below 50HZ and more than 2000HZ can be filtered out；And voice output processing module can increase driving force, and only amplify in the range of 50HZ ~ 2000HZ and have tuner frequently, while preventing causes of sound distortion.
Brief description of the drawings
The present invention is specifically described below by accompanying drawing and in conjunction with the embodiments, advantages of the present invention and implementation will be more obvious, and wherein content is only used for explanation of the present invention shown in accompanying drawing, without constituting to the limitation gone up in all senses of the invention.
Fig. 1 is a kind of structured flowchart of speech signal pre-processing system of the invention；
Fig. 2 is a kind of circuit connection diagram of the phonetic entry processing module of speech signal pre-processing system of the invention.
Fig. 3 is a kind of circuit connection diagram of the voice output processing module of speech signal pre-processing system of the invention.
Specific embodiment
Embodiments of the invention are elaborated below：The present embodiment is implemented under premised on technical solution of the present invention, gives detailed implementation method and specific operating process.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some variations and modifications, these belong to the scope of the present invention.
A kind of speech signal pre-processing system, as shown in figure 1, including the microphone of unidirectional connection successively, phonetic entry processing module, converter and the D/A converter, voice output processing module, the loudspeaker that unidirectionally connect successively,
As shown in Fig. 2 the microphone connects the input of isolating transformer T1 in phonetic entry processing module；The output end of the isolating transformer T1 connects one end of resistance R2 by capacitance C1, the reverse input end of the other end concatenation operation amplifier U1B of resistance R2, resistance R1 is the negative feedback resistor of operational amplifier U1B, the output end and reverse input end of concatenation operation amplifier U1B；The output end of the isolating transformer T1 also connects one end of resistance R5, the positive input of the other end concatenation operation amplifier U1B of resistance R5 by capacitance C4, while the positive input of operational amplifier U1B passes through resistance R6 and electric capacity C5 earths；The output end of the isolating transformer T1 is parallel with resistance R8；The output end of the operational amplifier U1B is connected to one end of resistance R3 by capacitance C2；The reverse input end of the other end concatenation operation amplifier U2B of the resistance R3；The positive input of the operational amplifier U2B is grounded by resistance R7；The slide rheostat RP1 for operational amplifier U2B negative feedback resistor, the output end and reverse input end of this resistance concatenation operation amplifier U2B, feedback resistance is adjustable；The output end of the operational amplifier U2B is connected to one end of resistance R4 by electric capacity C3；The other end connection converter of the resistance R4；
As shown in figure 3, the voice signal of the D/A converter output is connected to one end of resistance R10 by the capacitance C6 in voice output processing module；The inverting input of the other end concatenation operation amplifier U3B of the resistance R10；The positive input of the operational amplifier U3B is grounded by resistance R17；The slide rheostat RP2 negative feedback resistors that forms operational amplifier U3B in parallel with electric capacity C7, feeds back adjustable；The output end of the operational amplifier U3B is connected to one end of resistance R9 by electric capacity C9；The positive input of the other end difference concatenation operation amplifier U4B of the resistance R9 and one end of resistance R12；The other end ground connection of the resistance R12；The output end of the operational amplifier U4B is connected to the input of isolating transformer T2 by resistance R11；The reverse input end and output end of the operational amplifier U4B are directly connected to form voltage follower, and the output end of operational amplifier U4B passes through the reverse input end of resistance R13 concatenation operation amplifiers U5B；The positive input of the operational amplifier U5B is grounded by resistance R16；The resistance R14 negative feedback resistors that forms operational amplifier U5B in parallel with electric capacity C8；The output end of operational amplifier U5B is connected by resistance R15 with another input of isolating transformer T2；The output end connection loudspeaker of the isolating transformer T2.
Further, the transformation ratio of the isolating transformer T1 and T2 is 1:1.
Further, the secondary middle lead-out wire of input of the secondary middle lead-out wire of the output end of the isolating transformer T1 and isolating transformer T2 is grounded.
Further, wherein resistance R1 is 2K Ω, and resistance R2 is 2K Ω, and resistance R3 is 2K Ω, resistance R4 is 100 Ω, and resistance R5 is 2K Ω, and resistance R6 is 2K Ω, and resistance R7 is 2K Ω, resistance R8 is 600 Ω, and resistance R9 is 2K Ω, and resistance R10 is 2K Ω, resistance R11 is 33 Ω, and resistance R12 is 100K Ω, and resistance R13 is 100K Ω, resistance R14 is 100K Ω, and resistance R15 is 33 Ω, and resistance R16 is 2K Ω, resistance R17 is 2K Ω, and slide rheostat RP1 is 20K Ω, and slide rheostat RP1 is 20K Ω.
Further, electric capacity C1 is 10 μ F, and electric capacity C2 is 10 μ F, and electric capacity C3 is 10 μ F, and electric capacity C4 is 10 μ F, and electric capacity C5 is 47nF, and electric capacity C6 is 10 μ F, and electric capacity C7 is 100pF, and electric capacity C8 is 100pF, and electric capacity C9 is 10 μ F.
The above is preferred exemplary applications of the invention, not limitation of the present invention, and every simple modification made according to technical key point, structure change change are belonged within protection scope of the present invention.
Claims (3)
1. a kind of speech signal pre-processing system, including the microphone of unidirectional connection, phonetic entry processing module, converter and the D/A converter, voice output processing module, the loudspeaker that unidirectionally connect successively successively, it is characterised in that：
The input of isolating transformer T1 in the microphone connection phonetic entry processing module；The output end of the isolating transformer T1 connects one end of resistance R2 by capacitance C1, the reverse input end of the other end concatenation operation amplifier U1B of resistance R2, resistance R1 is the negative feedback resistor of operational amplifier U1B, the output end and reverse input end of concatenation operation amplifier U1B；The output end of the isolating transformer T1 also connects one end of resistance R5, the positive input of the other end concatenation operation amplifier U1B of resistance R5 by capacitance C4, while the positive input of operational amplifier U1B passes through resistance R6 and electric capacity C5 earths；The output end of the isolating transformer T1 is parallel with resistance R8；The output end of the operational amplifier U1B is connected to one end of resistance R3 by capacitance C2；The reverse input end of the other end concatenation operation amplifier U2B of the resistance R3；The positive input of the operational amplifier U2B is grounded by resistance R7；The slide rheostat RP1 for operational amplifier U2B negative feedback resistor, the output end and reverse input end of this resistance concatenation operation amplifier U2B, feedback resistance is adjustable；The output end of the operational amplifier U2B is connected to one end of resistance R4 by electric capacity C3；The other end connection converter of the resistance R4；
The voice signal of the D/A converter output is connected to one end of resistance R10 by the capacitance C6 in voice output processing module；The inverting input of the other end concatenation operation amplifier U3B of the resistance R10；The positive input of the operational amplifier U3B is grounded by resistance R17；The slide rheostat RP2 negative feedback resistors that forms operational amplifier U3B in parallel with electric capacity C7, feeds back adjustable；The output end of the operational amplifier U3B is connected to one end of resistance R9 by electric capacity C9；The positive input of the other end difference concatenation operation amplifier U4B of the resistance R9 and one end of resistance R12；The other end ground connection of the resistance R12；The output end of the operational amplifier U4B is connected to the input of isolating transformer T2 by resistance R11；The reverse input end and output end of the operational amplifier U4B are directly connected to form voltage follower, and the output end of operational amplifier U4B passes through the reverse input end of resistance R13 concatenation operation amplifiers U5B；The positive input of the operational amplifier U5B is grounded by resistance R16；The resistance R14 negative feedback resistors that forms operational amplifier U5B in parallel with electric capacity C8；The output end of operational amplifier U5B is connected by resistance R15 with another input of isolating transformer T2；The output end connection loudspeaker of the isolating transformer T2.
2. a kind of speech signal pre-processing system according to claim 1, it is characterised in that：The transformation ratio of the isolating transformer T1 and T2 is 1:1.
3. a kind of speech signal pre-processing system according to claim 1, it is characterised in that：The secondary middle lead-out wire of the input of lead-out wire and isolating transformer T2 is grounded in the middle of the output end of the isolating transformer T1 is secondary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510935721.6A CN106887234A (en) | 2015-12-15 | 2015-12-15 | A kind of speech signal pre-processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510935721.6A CN106887234A (en) | 2015-12-15 | 2015-12-15 | A kind of speech signal pre-processing system |
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| CN106887234A true CN106887234A (en) | 2017-06-23 |
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| CN201510935721.6A Pending CN106887234A (en) | 2015-12-15 | 2015-12-15 | A kind of speech signal pre-processing system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06216772A (en) * | 1993-01-14 | 1994-08-05 | Hitachi Ltd | A/d converter and completely differential operational amplifier circuit |
| JPH11154304A (en) * | 1997-11-20 | 1999-06-08 | Sony Corp | Magnetic reproducing device |
| CN102386987A (en) * | 2011-10-24 | 2012-03-21 | 哈尔滨工程大学 | Underwater wireless voice electromagnetic communication simulating system |
| JP2014143537A (en) * | 2013-01-23 | 2014-08-07 | Yamaha Corp | Load current detection circuit |
| CN204408450U (en) * | 2015-03-04 | 2015-06-17 | 西安科技大学 | Emergency communication main frame speed signal processing circuit |
| CN205354649U (en) * | 2015-12-15 | 2016-06-29 | 西安富成防务科技有限公司 | Speech signal pretreatment systems |
-
2015
- 2015-12-15 CN CN201510935721.6A patent/CN106887234A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06216772A (en) * | 1993-01-14 | 1994-08-05 | Hitachi Ltd | A/d converter and completely differential operational amplifier circuit |
| JPH11154304A (en) * | 1997-11-20 | 1999-06-08 | Sony Corp | Magnetic reproducing device |
| CN102386987A (en) * | 2011-10-24 | 2012-03-21 | 哈尔滨工程大学 | Underwater wireless voice electromagnetic communication simulating system |
| JP2014143537A (en) * | 2013-01-23 | 2014-08-07 | Yamaha Corp | Load current detection circuit |
| CN204408450U (en) * | 2015-03-04 | 2015-06-17 | 西安科技大学 | Emergency communication main frame speed signal processing circuit |
| CN205354649U (en) * | 2015-12-15 | 2016-06-29 | 西安富成防务科技有限公司 | Speech signal pretreatment systems |
Non-Patent Citations (2)
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| 杜伟明等: "一种新型集成传输系统", 《电子工程师》 * |
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Application publication date: 20170623 |
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