CN1731508A - A reverberation generating circuit - Google Patents
A reverberation generating circuit Download PDFInfo
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- CN1731508A CN1731508A CN 200510090896 CN200510090896A CN1731508A CN 1731508 A CN1731508 A CN 1731508A CN 200510090896 CN200510090896 CN 200510090896 CN 200510090896 A CN200510090896 A CN 200510090896A CN 1731508 A CN1731508 A CN 1731508A
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- 230000006837 decompression Effects 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 9
- 230000003111 delayed effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 241001269238 Data Species 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000035807 sensation Effects 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 230000006854 communication Effects 0.000 description 1
- 238000013144 data compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000005039 memory span Effects 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
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Abstract
The invention discloses a reverberation generating circuit, which comprises: a superimposed synthetic circuit and a plurality of feedback circuit, wherein each feedback circuit is formed by a delay circuit and a wane circuit; the output end of the superimposed synthetic circuit is connected with the input end of the delay circuit of the first feedback circuit; the output end of the feedback circuit is connected with the input end of the second feedback circuit; the output end of the wane circuit of the feedback circuit is connected with the input end of the superimposed synthetic circuit which is connected with a plurality of feedback circuits to form a reverberation generating circuit with multi-stage processing course.
Description
Technical field
The present invention relates to the synthetic field of sound, particularly be used to produce the reverberation generating circuit of reflection reverberation effect in the speech synthesizing device.
Background technology
Reverb (reverberation) audio is a kind of reflection reverberation sound effect, it is the effect of simulated sound after following process: be reflected through a cross section after sound sends out, decay taken place in the sound that reflects, and this sound that decay taken place is again with current sound mix together the time then.Such audio sounds the people more stereoscopic sensation, gives the sensation of a kind of spaciousness of people.
Realizing the scheme of Reverb audio in the prior art, mainly is the principle that adopts the time-delay stack, and the sound that at first allows is into delivered to a delay circuit, and the acoustic playback that mixes newly to come in that superposes is then gone out, and just can realize the Reverb audio so like this.As shown in Figure 1, the voice signal of the output terminal output of stack combiner circuit is sent to a delay circuit, by being transferred to attenuator circuit after the delay process, in the voice signal stack summation that superposes combiner circuit and newly come in, output terminal just can obtain having had the voice signal of Reverb effect like this through the voice signal after the attenuator circuit processing.U.S. Patent number is US4, the description that 955,057 patent is detailed similar device; Chinese patent application number is that 200310016979.0 application improves the method for above-mentioned time-delay stack.
But what adopt in the such scheme all is single channel time-delay, the time-delay aliasing that this method realizes for once, and actual audio mixing is the stack of a plurality of paths reflection in the space, so those schemes often can not reach good effect.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of reverberation generating circuit, and it can realize the multistage time-delay to sound, to reach the effect of imitating actual audio mixing better.
Another purpose of the present invention is to provide a kind of reverberation generating circuit, and memory span causes circuit area big greatly in the prior art to such an extent as to solve, the problem that hardware cost is high.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of reverberation generating circuit comprises: a stack combiner circuit, and a plurality of backfeed loop; Wherein, each backfeed loop forms by a delay circuit and an attenuator circuit series connection;
The output terminal of described stack combiner circuit links to each other with the input end of delay circuit in first backfeed loop, the output terminal of attenuator circuit links to each other with the input end of described stack combiner circuit in first backfeed loop, is fed back the combiner circuit that superposes by the voice signal of described stack combiner circuit output terminal output after described delay circuit and attenuator circuit are handled and superposes;
The output terminal of delay circuit links to each other with the input end of delay circuit in second backfeed loop in first backfeed loop simultaneously, the output terminal of attenuator circuit links to each other with the input end of described stack combiner circuit in described second backfeed loop, the voice signal that delay circuit carries out delay process in first backfeed loop can be delayed time and attenuation processing once more by second backfeed loop, and feeds back to the stack combiner circuit and superpose;
Equally, the output terminal of delay circuit links to each other with the input end of delay circuit in the 3rd backfeed loop in second backfeed loop, and the output terminal of attenuator circuit links to each other with the input end of described stack combiner circuit in described the 3rd backfeed loop;
And the like, described stack combiner circuit and a plurality of backfeed loop form the reverberation generating circuit with multistage processing procedure.
Further, described each delay circuit can adopt identical module to finish;
Further, described attenuator circuit also can be reused;
Further, increase a compressor circuit and a decompression circuit respectively at the input end and the output terminal of described each delay circuit, the voice signal that carries out delay process to delay circuit carries out compression and decompression;
Further, described compressor circuit and decompression circuit are ADPCM compressor circuit and ADPCM decompression circuit;
Further, described compressor circuit and decompression circuit also can be reused.
As seen from the above technical solution, the present invention forms the reverberation generating circuit with multistage processing capacity by adopting a plurality of delay circuits, reaches better audio mixing effect.
In addition, adopt compressor circuit and decompression circuit, the voice data that feasible needs are stored in the delay circuit reduces greatly, so, not only reduce the capacity of required storer in the design and then also reduced the area of circuit, reduce hardware cost, simultaneously, also can effectively adapt to the sound increase of time expand.
Simultaneously, when using the ADPCM compression, according to the situation of overall computation complexity and clock frequency, can parallel computation between a plurality of modules, perhaps to share, implementation is flexible.
Description of drawings
Fig. 1 is the structure diagram of reverberation generating circuit in the prior art;
Fig. 2 is the structure diagram of reverberation generating circuit embodiment one of the present invention;
Fig. 3 is the structure diagram of reverberation generating circuit embodiment two of the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
As shown in Figure 2, an embodiment for reverberation generating circuit of the present invention comprises: a stack combiner circuit 10 receives the voice signal IN that transmits, the voice signal OUT after output is synthetic; Present embodiment also comprises 3 backfeed loops, and wherein, each backfeed loop forms by a delay circuit and an attenuator circuit series connection;
The output terminal of described stack combiner circuit 10 links to each other with the input end of delay circuit 21 in first backfeed loop, delay circuit 21 receives the voice signal OUT1 (OUT) after synthesizing of described stack combiner circuit 10 outputs, after voice signal has carried out the time-delay of the schedule time through described delay circuit 21, attenuator circuit 22 again from delay circuit 21 output datas to first backfeed loop, decay in the described attenuator circuit 22 simulated sound communication processes is handled voice signal, and voice signal IN1 after treatment reenters stack combiner circuit 10 and synthesizes;
The output terminal of delay circuit 21 links to each other with the input end of delay circuit 31 in second backfeed loop in first backfeed loop simultaneously, the output terminal of attenuator circuit 32 links to each other with the input end of described stack combiner circuit 10 in described second backfeed loop, the voice signal OUT2 that delay circuit 21 carried out delay process in first backfeed loop can be delayed time and attenuation processing once more by second backfeed loop, and the voice signal IN2 after the feedback processing superposes synthetic for stack combiner circuit 10;
Equally, the output terminal of delay circuit 31 links to each other with the input end of delay circuit 41 in the 3rd backfeed loop in second backfeed loop, and the output terminal of attenuator circuit 42 links to each other with the input end of described stack combiner circuit 10 in described the 3rd backfeed loop; The voice signal OUT3 that delay circuit 31 carried out delay process in second backfeed loop can be delayed time and attenuation processing once more by the 3rd backfeed loop, and the voice signal IN3 after the feedback processing superposes synthetic for stack combiner circuit 10; So, it is synthetic that the data after handling through three backfeed loops and original sound signal superpose in stack combiner circuit 10, just can hear the voice signal that has the Reverb effect at the output terminal of the combiner circuit 10 that superposes like this.
Obviously, reverberation generating circuit with multistage processing procedure and function such as shown in the present.As required, the quantity of backfeed loop can be set, and wherein each delay circuit can adopt identical module to finish, the attenuator circuit of described different backfeed loops also can be reused or be shared, and does not need to be provided with a plurality of.
As shown in Figure 3, be another embodiment of reverberation generating circuit of the present invention.In this embodiment, in Fig. 2 on the basis of embodiment one, the input end of each delay circuit and output terminal have increased a compressor circuit and a decompression circuit respectively in three backfeed loops, carry out compression and decompression with the voice signal that need carry out delay process to delay circuit; As figure, described compressor circuit 23 input ends connect the output terminal of stack combiner circuit 10, and the output terminal of compressor circuit 23 connects the input end of delay circuit 21; The input end of described decompression circuit 24 connects the output terminal of delay circuit 21, and the output terminal of decompression circuit 24 connects the input end of attenuator circuit 22.In like manner, in addition the connected mode of the two pairs of compressor circuits and decompression circuit (33,34,43,44) no longer large fierce dog state.
In the present embodiment, we with the ADPCM compression for example, ADPCM (Adaptive DifferentialPulse Code Modulation), be called adaptive difference pulse code, it is a kind of lossy compression method, it has lost partial information, but owing to the insensitivity of people's ear to sound, suitable lossy compression method is little to the influence of audiovisual result of broadcast; The quantized value of ADPCM record is not the amplitude of each sampled point, but this amplitude and previous sampled point amplitude is poor.
PCM to 16bitd compresses like this, and the quantization of each sampled point does not just need 16bit, can reduce the capacity of signal thus.Certainly, reverberation generating circuit of the present invention adopts other sound compression method and the device also can fine realization.
After the input end of stack combiner circuit 10 receives the voice signal of a PCM (pulse code modulation (PCM)) form, through its output terminal output, this voice signal is in entering first backfeed loop before the delay circuit 21, compress through described ADPCM compressor circuit 23 earlier, ADPCM compressor circuit 23 is 16 PCM data compression the data of position still less at first, as 4, then the data after the compression are sent in the delay circuit 21 and stored, we will realize the time-delay of 1 second kind in this supposition, and our the sampled voice frequency of output is 48k/s, this delay circuit just needs the voice data after 48k of storage compressed so, be the 24k byte, the storage unit that needs is 24k just also, same voice signal, if before not compressing, store, then need be up to the storage space of 96k byte data; After data have been carried out the time-delay of the schedule time through delay circuit 21, export packed datas to ADPCM decompression circuit 24 from delay circuit 21 again, ADPCM decompression circuit 24 can decompress packed data and be reduced to the data of approximate original sound, these errors are within the imperceptible scope of people's ear, data after decompressing have been exactly real sound PCM data, and its carries out entering stack combiner circuit 10 after the attenuation processing through attenuator circuit 22 and superposes synthetic; The processing procedure of two other backfeed loop in like manner can obtain.
Further, above-mentioned compressor circuit and decompression circuit also can be reused or be shared, and do not need to be provided with a plurality of.
Device of the present invention can be used in many sound synthetic systems; should be understood that; the above only is a preferred implementation of the present invention; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention; can also make some improvement and variation, these improvement and variation also should be considered as protection scope of the present invention.
Claims (6)
1, a kind of reverberation generating circuit comprises: a stack combiner circuit, and a plurality of backfeed loop; Wherein, each backfeed loop forms by a delay circuit and an attenuator circuit series connection;
The output terminal of described stack combiner circuit links to each other with the input end of delay circuit in first backfeed loop, the output terminal of attenuator circuit links to each other with the input end of described stack combiner circuit in first backfeed loop, is fed back the combiner circuit that superposes by the voice signal of described stack combiner circuit output terminal output after described delay circuit and attenuator circuit are handled and superposes;
The output terminal of delay circuit links to each other with the input end of delay circuit in second backfeed loop in first backfeed loop simultaneously, the output terminal of attenuator circuit links to each other with the input end of described stack combiner circuit in described second backfeed loop, the voice signal that delay circuit carries out delay process in first backfeed loop can be delayed time and attenuation processing once more by second backfeed loop, and feeds back to the stack combiner circuit and superpose;
Equally, the output terminal of delay circuit links to each other with the input end of delay circuit in the 3rd backfeed loop in second backfeed loop, and the output terminal of attenuator circuit links to each other with the input end of described stack combiner circuit in described the 3rd backfeed loop;
And the like, described stack combiner circuit and a plurality of backfeed loop form the reverberation generating circuit with multistage processing procedure.
2, device according to claim 1, it is characterized in that, input end and output terminal at described each delay circuit increase a compressor circuit and a decompression circuit respectively, and the voice signal that carries out delay process to delay circuit carries out compression and decompression.
3, device according to claim 1 and 2 is characterized in that, described compressor circuit and decompression circuit are ADPCM compressor circuit and ADPCM decompression circuit.
4, device according to claim 1 and 2 is characterized in that, described attenuator circuit can be reused.
5, device according to claim 1 and 2 is characterized in that, described each delay circuit can adopt identical module to finish.
6, device according to claim 1 and 2 is characterized in that, described compressor circuit and decompression circuit can be reused.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100908968A CN100375149C (en) | 2005-08-19 | 2005-08-19 | A reverberation generating circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100908968A CN100375149C (en) | 2005-08-19 | 2005-08-19 | A reverberation generating circuit |
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| CN1731508A true CN1731508A (en) | 2006-02-08 |
| CN100375149C CN100375149C (en) | 2008-03-12 |
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| CNB2005100908968A Expired - Fee Related CN100375149C (en) | 2005-08-19 | 2005-08-19 | A reverberation generating circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101123088B (en) * | 2007-09-03 | 2010-06-02 | 北京中星微电子有限公司 | A chorus special effect processing method and system |
| CN102436805A (en) * | 2010-09-29 | 2012-05-02 | 炬力集成电路设计有限公司 | Reverberant unit and reverberating method |
| CN102638757A (en) * | 2006-02-14 | 2012-08-15 | 意法半导体亚太私人有限公司 | Digital audio signal processing method and system for generating and controlling digital reverberations for audio signals |
| CN104952455B (en) * | 2015-06-19 | 2019-03-15 | 珠海市杰理科技股份有限公司 | The method and apparatus for realizing reverberation |
| CN110189740A (en) * | 2019-06-24 | 2019-08-30 | 上海矽诺微电子有限公司 | Reverberation circuit and its control method, chip and device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100342425C (en) * | 2003-12-05 | 2007-10-10 | 北京中星微电子有限公司 | A reverberation generating circuit |
| CN1589066A (en) * | 2004-09-03 | 2005-03-02 | 威盛电子股份有限公司 | Method and relative device for producing echo effect |
-
2005
- 2005-08-19 CN CNB2005100908968A patent/CN100375149C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102638757A (en) * | 2006-02-14 | 2012-08-15 | 意法半导体亚太私人有限公司 | Digital audio signal processing method and system for generating and controlling digital reverberations for audio signals |
| CN101123088B (en) * | 2007-09-03 | 2010-06-02 | 北京中星微电子有限公司 | A chorus special effect processing method and system |
| CN102436805A (en) * | 2010-09-29 | 2012-05-02 | 炬力集成电路设计有限公司 | Reverberant unit and reverberating method |
| CN102436805B (en) * | 2010-09-29 | 2013-03-27 | 炬力集成电路设计有限公司 | Reverberant unit and reverberating method |
| CN104952455B (en) * | 2015-06-19 | 2019-03-15 | 珠海市杰理科技股份有限公司 | The method and apparatus for realizing reverberation |
| CN110189740A (en) * | 2019-06-24 | 2019-08-30 | 上海矽诺微电子有限公司 | Reverberation circuit and its control method, chip and device |
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| Publication number | Publication date |
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| CN100375149C (en) | 2008-03-12 |
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Granted publication date: 20080312 Termination date: 20120819 |