CN101179278B - Acoustics system and voice signal coding method thereof - Google Patents

Abstract

The invention provides an audio system and a sound information coding method. The sound information coding system comprises a sound information input terminal, an input buffer unit, a coding unit, an output buffer unit and a sound information output terminal. The coding unit further includes auxiliary arithmetic units and main arithmetic units. The system shares coding sound information computation of the main arithmetic units by means of the auxiliary arithmetic units and calculates the sound signals by adjusting wave filter exhaust, fast Fourier transform, reform-type digital cosine transformation and reform-type digital sine transformation, thereby reducing complexity of the algorithm, improving efficiency of processing sound signals, reducing the whole clock pulse rate and saving power consumption.

Description

The method of sound system and voice signal coding thereof

Technical field

The present invention relates to a kind of acoustics, be meant the method for a kind of sound system and voice signal coding thereof especially.

Background technology

Traditional acoustics be with tape as recording-media, yet the volume of tape big, be difficult for the easy distortion of tonequality of preservation, recording and playback, and can't arbitrary access.

The access medium as the access sound signal in order to solve the shortcoming of above-mentioned traditional acoustics, to have developed on the market at present, for example memory card, dish, discs etc. with oneself with Digital Media.Utilize digital storage medium to come the access sound signal, on the calculation process sound signal and on the access sound signal, all adopt digitized mode, the sound signal even recording that can reach undistorted (not compressing) and the distortionless playback that are provided for the access digital tone source, or the recording of few distortion (need) and the playback of few distortion through overcompression.In addition, come the acoustics of access sound signal can have long record length with digital storage medium, and on recording speed, if adopt digital tone source as the recording source, as long as digital tone source can high power speed be play, acoustics just can reach the recording of high power speed.

Yet, the acoustics that development comes the access sound signal with digital storage medium, its mode that realizes the sound signal compression is an important key.Generally speaking, present acoustics is all with utter a word calculation process in the compression of sound signal of single digital signal microprocessor (digital signal micro-processor).When acoustics is handled (real time) sound signal compression in real time, if sound signal input rate height to the limit of the deal with data amount that surpasses the digital signal microprocessor, causes the phenomenon of data throughput quantity not sufficient easily.

Summary of the invention

The method that the purpose of this invention is to provide a kind of sound system and voice signal coding thereof, this system shares the operand of main arithmetic element encode sound signal with the auxiliary operation unit, and change the computing sound signal with modulation filter row, fast fourier transform, the conversion of Improvement type digital cosine and Improvement type digital sine, action with further work coding, thus, can reduce the complexity of algorithm, the efficient that promotes the processing sound signal, the whole clock pulse speed of reduction, and the consumption of saving electric power.

In sound system provided by the present invention, the voice signal coding system comprises sound signal input, input buffer cell, coding unit, output buffer cell and sound signal output.Coding unit further comprises auxiliary operation unit and main arithmetic element.

When sound signal inputs to coded system by the sound signal input, and when being digital signal, the data sequence that coded system can first buffer voice signal, and then be sent in the coding unit.Then, the auxiliary operation unit can receive sound signal, and utilize cosine-modulated filter row with operation law, fast fourier transform, the conversion of Improvement type digital cosine etc., share the computing sound signal, and the state and the sound signal after the computing of calculating process is sent to main arithmetic element.Main arithmetic element then can then be done further coding action with the sound signal of auxiliary operation unit output, and according to the state of auxiliary operation unitary operation sound signal, provide controlling signal to the auxiliary operation unit, make the auxiliary operation unit do further computing action according to this controlling signal again.At last, the output buffer cell can cushion the sound signal of coding unit output, and is sent to the sound signal output.

For reaching above-mentioned purpose, the invention provides a kind of acoustics, in order to a sound signal is recorded, is play and change the processing of shelves, it comprises: a coding/decoding unit, in order to encode or to decipher this sound signal, wherein utilize a cosine-modulated filter row, a fast fourier transform, Improvement type digital cosine conversion and an Improvement type digital sine to change and quicken this sound signal of calculation process, wherein this fast fourier transform is in order to realize this cosine-modulated filter row; One digital analog converter is in order to conversion this sound signal after this coding/decoding cell decode; One digital storage medium, in order to storing this sound signal after encoded that this coding/decoding unit provided, or in order to this sound signal to be provided; And a broadcast unit, in order to amplify and to play this sound signal through this digital analog converter conversion.

For reaching above-mentioned purpose, the present invention also provides a kind of method of voice signal coding, and it comprises: import sound signal to a voice signal coding system; Utilize a cosine-modulated filter row, a fast fourier transform, Improvement type digital cosine conversion and Improvement type digital sine conversion that this sound signal is divided into a plurality of sub-bands, wherein this fast fourier transform is in order to realize this cosine-modulated filter row; State according to sound signal being divided into these sub-bands produces a controlling signal, and produces follow-up sub-band according to this controlling signal; And these sub-bands of encoding.

By above-mentioned technical characterictic, advantage provided by the present invention is, utilizes the auxiliary operation unit to share the operand of main arithmetic element in the voice signal coding system.

Another advantage provided by the present invention is, utilizes modulation filter row, fast fourier transform, the conversion of Improvement type digital cosine and Improvement type digital sine to change sound signal is divided into a plurality of sub-bands, with the action of further work coding.

An advantage more provided by the present invention is, utilizes fast fourier transform to realize the modulation filter row.

An advantage more provided by the present invention is, utilizes conversion of Improvement type digital cosine and Improvement type digital sine to change to assist fast fourier transform to realize the modulation filter row.

An advantage more provided by the present invention is, utilizes sharing of main arithmetic element operand, can promote efficient, the whole clock pulse speed of reduction of handling sound signal, and the consumption of saving electric power.

Description of drawings

Fig. 1 is the block schematic diagram of the sound system of content of the present invention;

Fig. 2 is the block schematic diagram of the voice signal coding system of the coding/decoding unit of content of the present invention;

Fig. 3 is the coding flow chart of the sound signal of content of the present invention;

Fig. 4 is the flow chart with cosine-modulated filter row realization voice signal coding of content of the present invention;

Fig. 5 realizes the flow chart of cosine-modulated filter row for content of the present invention with fast fourier transform.

Symbol description among the figure

Coding/decoding unit 10

Sound signal input 110

Input buffer cell 120

Coding unit 130

Auxiliary operation unit 131

Main arithmetic element 133

Output buffer cell 140

Sound signal output 150

Analog-digital converter 20

Digital analog converter 30

Digital storage medium 40

Broadcast unit 50

Embodiment

Please refer to shown in Figure 1ly, in order to the system architecture of acoustics provided by the present invention to be described, wherein Fig. 1 is the block schematic diagram of the acoustics of content of the present invention.Acoustics 1 of the present invention comprises a coding/decoding unit (encoding/decoding unit) 10, one analog-digital converter (analogy-to-digital converter, ADC) 20, one digital analog converter 30 (digital-to-analogy converter, DAC), a digital storage medium 40 and a broadcast unit 50.

The sound signal X that supposes to input to acoustics 1 is a digital signal, acoustics 1 can utilize coding/decoding unit 10 directly sound signal X to be encoded, be stored to digital storage medium 40 at last, or after converting analog signal to via digital analog converter 30 again, amplify and output by broadcast unit 50.The sound signal X that supposes to input to acoustics 1 is an analog signal, then acoustics 1 can utilize analog-digital converter 20 to convert sound signal X to digital signal earlier, be resent to coding/decoding unit 10 and do the coding action, at last, sound signal X behind the coding is stored to digital storage medium 40, or after converting analog signal to via digital analog converter 30 again, amplify and output by broadcast unit 50.

When desire is play the sound signal X that is stored in the digital storage medium 40, acoustics 1 can directly be come out sound signal X by acquisition in the digital storage medium 40, after 10 decodings of coding/decoding unit, convert the sound signal X of digital form to analog signal via digital analog converter 30 again, by broadcast unit 50 sound signal X is amplified again at last and play back.

Therefore, from the above, this digital storage medium 40 can be a discs etc., but the present invention is not limited to this, allly can reach the Storage Media with stored in digital format with sound signal X, is all scope of the present invention.

The present invention one of further proposes in the above-mentioned coding/decoding unit 10 coded system and illustrates, coding scheme with the processing of auxiliary operation unit auxiliary figure signal, as shown in Figure 2, be the block schematic diagram of the voice signal coding system of the coding/decoding unit of content of the present invention.The voice signal coding system comprises a sound signal input 110, an input buffer cell (input buffer) 120, one coding unit 130, an output buffer cell (output buffer) 140 and one sound signal output 150.Coding unit 130 further comprises an auxiliary operation unit (auxiliaryoperating unit) 131 and one main arithmetic element (major operating unit) 133.

Sound signal input 110 is connected in the auxiliary operation unit 131 in the coding unit 130 by input buffer cell 120.133 of main arithmetic elements in the coding unit 130 are connected in sound signal output 150 by output buffer cell 140.Computing is mainly done in order to auxiliary main arithmetic element 133 in auxiliary operation unit 131, shares the operand (computon) of main arithmetic element 133 calculation process sound signal X.And main arithmetic element 133 is mainly used to encode sound signal X, and provides controlling signal to do further computing to auxiliary operation unit 131 according to the state of auxiliary operation unit 131 computing sound signal X.

Please refer to shown in Figure 3ly, be the coding flow chart of the sound signal of content of the present invention.When sound signal X inputs to coded system in the coding/decoding unit 10 by sound signal input 110, and when being digital signal, as step S310, the data sequence of the first buffer voice signal X of coded system meeting, as step S320, and then be sent in the coding unit 130.

Auxiliary operation unit 131 in the coding unit 130 can receive sound signal X, and utilization has cosine-modulated filter row (cosine modulated filter bank), fast fourier transform (the fast fourier transform of operation law, FFT), Improvement type digital cosine conversion (modified digital cosine transform, MDCT) etc., share computing sound signal X, and the state of calculating process and the sound signal X after the computing be sent to main arithmetic element 133, as step S330.

133 of main arithmetic elements can be then with the further coding action of the sound signal X work of auxiliary operation unit 131 outputs, and according to the state of auxiliary operation unit 131 computing sound signal X, provide controlling signal to auxiliary operation unit 131, make auxiliary operation unit 131 do further computing action according to this controlling signal again, as step S340.At last, the sound signal X that output buffer cell 140 can 130 outputs of buffering coding units as step S350, and is sent to sound signal output 150 and exports, as step S360.

Therefore, from the above, this main arithmetic element 133 can be Digital System Processor (digital signal processing, DSP) etc., and the virtual bench that auxiliary operation unit 131 can utilize programming to form, but the present invention is not limited to this, and all mechanism that can reach processing computing sound signal X is all scope of the present invention.

In order further to set forth coding method of the present invention, the present invention proposes a kind of action that utilizes the cosine-modulated filter row to realize sound signal X compression in the sound signal X coding, as shown in Figure 4, realize the flow chart of voice signal coding for content of the present invention with the cosine-modulated filter row.

When sound signal X inputs to coding unit 130 among Fig. 3, because sound signal X has a plurality of output points, therefore at first the output point of sound signal X is divided into a plurality of data vectors, be respectively X[1] to X[N], as step S410.

Then, data vector X[1 with these sound signals X] to X[N] utilize Improvement type cosine conversion (MDCT) and Improvement type sine to change (modified digital sine transform respectively, MDST) analyze, to produce cosine transfer function Y1 and sinusoidal transfer function Y2, as step S420.

When coding unit 130 is finished data vector X[1 with these sound signals X] to X[N] convert cosine transfer function Y1 and sinusoidal transfer function Y2 to after, utilize first table of comparisons to make cosine transfer function Y1 produce the effect of vector multiplication again, to produce cosine multiplication function W1, and utilize second table of comparisons to make sinusoidal transfer function Y2 produce the effect of vector multiplication, to produce sinusoidal multiplication function W2, as step S430.Wherein, first table of comparisons is the table of comparisons of a SIN function, second table of comparisons is the table of comparisons of a cosine function, and cosine multiplication function W1 is multiplying each other of the cosine transfer function Y1 and first table of comparisons, can be considered a matrix function, sinusoidal multiplication function W2 is multiplying each other of the sinusoidal transfer function Y2 and second table of comparisons then, also can be considered a matrix function.

At last, cosine is doubled function W1 and sinusoidal multiplication function W2 addition produce modulation function Z again, as step S440, carry out the coding action further to export main arithmetic element 133 to, as step S450.Because cosine multiplication function W1 and sinusoidal multiplication function W2 are all matrix function, so modulation function Z also be matrix function, and for the double integration of function W2 of cosine multiplication function W1 and sine, can be divided into a plurality of frequency band vector Z [1] to Z[N].

In order further to set forth among the present invention, the step of cosine transfer function Y1 and sinusoidal transfer function Y2 is resolved into data signals X in the sinusoidal conversion of conversion of Improvement type cosine and Improvement type, the present invention proposes a kind of action that utilizes fast fourier transform to realize the cosine-modulated filter row, as shown in Figure 5, it realizes the flow chart of cosine-modulated filter row for content of the present invention with fast fourier transform.

At first, will input to the output point rearrangement of the data signals X in the coding unit 130 of Fig. 2, also be about to the data vector X[1 of data signals X] to X[N] in the output point rearrangement, as step S510.The output point ordering of data signals X is as follows:

$f\left(k\right)\≡\left\{\begin{array}{cc}-f(k+\frac{3}{4}N)& 0\≤k\≤\frac{N}{4}-1\\ f(k-\frac{1}{4}N)& \frac{N}{4}\≤k\≤N-1\end{array}\right.$

And

$F\left(i\right)=\underset{k=0}{\overset{N-1}{\mathrm{\Σ}}}\tilde{f}\left(k\right)\·\sin \left[\frac{\mathrm{\π}}{2N}(2i+1)(2k+1)\right],$ $i=0,...,\frac{N}{2}-1,$

Wherein, k the output point of k representative data signal X, N the data vector of N representative data signal X, i the data vector of I representative data signal X, and F (i) is the fourier transform formula of f (k).

Utilize change of variable to make F (2i+1)=F (N-2i-2), and the output point of merging data signal X, to produce complex function f1 and f2, as step S520.

$f1=(\tilde{f}\left(2k\right)-\tilde{f}(N-2k-1))+j\·(\tilde{f}(\frac{N}{2}+2k)-\tilde{f}(\frac{N}{2}-2k-1)),$ $0\≤k\≤\frac{N}{4}-1,$

$f2=(\tilde{f}\left(2k\right)+\tilde{f}(N-2k-1))+j\·(\tilde{f}(\frac{N}{2}+2k)+\tilde{f}(\frac{N}{2}-2k-1)),$ $0\≤k\≤\frac{N}{4}-1,$

Wherein, f1 is the complex function of even function, and f2 is the complex function of odd function.

Rotation

And get the conjugate complex number of complex function f1, f2, form conjugate function f1 ^*And f2 ^*, as step S530.

${\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="H061E3945420061114E000011.png,H061E3945420061114E000041.png"\; state="\{\{state\}\}">f</figure-callout>}1}^{*}\left(k\right)=\mathrm{<figure-callout\; id="1"\; label="f"\; filenames="H061E3945420061114E000011.png,H061E3945420061114E000041.png"\; state="\{\{state\}\}">f</figure-callout>}1\&CenterDot;e^{\frac{2\mathrm{\&pi;j}}{N}(k+\frac{1}{8})}$

${f2}^{*}\left(k\right)=f2\&CenterDot;e^{\frac{2\mathrm{\&pi;j}}{N}(k+\frac{1}{8})}$

Utilize fast fourier transform to do computing, produce transfer function F1, F2, as step S540.

F _i＝(FFT(f ^*)) ^*

Get conjugate complex number and rotation again

Produce reduction transfer function F1 ^*, F2 ^*, as step S550.

$F^{*}\left(i\right)=F\left(i\right)\&CenterDot;e^{\frac{2\mathrm{\&pi;j}}{N}(i+\frac{1}{8})}$

Ordering result of calculation produces cosine transfer function Y1 and sinusoidal transfer function Y2, as step S560.

$Y1\left\{\begin{array}{c}F\left(2i\right)=\mathrm{Re}\left(\tilde{F}\left(i\right)\right)\\ F(2i+1)=\mathrm{Im}\left(\tilde{F}(\frac{N}{4}-i-1)\right)\end{array}\right.,m=0~\frac{N}{4}-1,$

$Y2\left\{\begin{array}{c}F\left(2i\right)=\mathrm{Im}\left(\tilde{F}\left(i\right)\right)\\ F(2i+1)=\mathrm{Re}\left(\tilde{F}(\frac{N}{4}-i-1)\right)\end{array}\right.,m=0~\frac{N}{4}-1,$

From the above, by utilizing fast fourier transform to realize the cosine-modulated filter row, number of sub-bands increase as sound signal X, and when causing operand significantly to increase, the voice signal coding system of content of the present invention can reduce the complexity of the algorithm that computing sound signal X is applied to, in addition, because the sharing of operand, can promote efficient, the whole clock pulse speed of reduction of handling sound signal, and the consumption of saving electric power.

Shown in accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.The above only is a preferable possible embodiments of the present invention, and is non-so promptly limit to claim of the present invention, so the equivalent structure that uses specification of the present invention and icon content to do such as changes, all in like manner is contained in the scope of the present invention, closes and gives Chen Ming.

Claims (14)

1. an acoustics in order to a sound signal is recorded, play and change the processing of shelves, is characterized in that, comprises:

One coding/decoding unit, in order to encode or to decipher this sound signal, wherein utilize a cosine-modulated filter row, a fast fourier transform, Improvement type digital cosine conversion and an Improvement type digital sine to change and quicken this sound signal of calculation process, wherein this fast fourier transform is in order to realize this cosine-modulated filter row;

One digital analog converter is in order to conversion this sound signal after this coding/decoding cell decode;

One digital storage medium, in order to storing this sound signal after encoded that this coding/decoding unit provided, or in order to this sound signal to be provided; And

One broadcast unit is in order to this sound signal that amplifies and broadcast is changed through this digital analog converter.

2. acoustics as claimed in claim 1 is characterized in that, this sound signal is a digital signal.

3. acoustics as claimed in claim 1 is characterized in that, further comprises an analog-digital converter, in order to change an analog signal to produce this sound signal.

4. acoustics as claimed in claim 1 is characterized in that, this coding/decoding unit comprises:

Preliminary computing in order to receiving this sound signal, and is done with this sound signal, to produce a state signal in one auxiliary operation unit; And

One main arithmetic element in order to providing a controlling signal to this auxiliary operation unit according to this state signal, and is done the coding action with this sound signal after preliminary computing;

Wherein, this auxiliary operation unit is just done further computing action according to this controlling signal with this sound signal after receiving this controlling signal.

5. acoustics as claimed in claim 4 is characterized in that, this coding/decoding unit also further comprises:

One input buffer cell in order to cushion this sound signal, is further done computing and coding action; And

One output buffer cell is in order to cushion this sound signal that this main arithmetic element provides, further to make output action.

6. acoustics as claimed in claim 1 is characterized in that, this digital storage medium is a discs, a built-in memory storage or an external memory storage.

7. acoustics as claimed in claim 4, it is characterized in that, this auxiliary operation unit is after receiving this sound signal, promptly utilize this cosine-modulated filter row, this fast fourier transform, this Improvement type digital cosine conversion and the conversion of this Improvement type digital sine, this sound signal is divided into a plurality of sub-bands, producing this state signal, and produce follow-up state signal according to this controlling signal; And this main arithmetic element reception transmits and next this state signal and this sound signal after preliminary computing from this auxiliary operation unit, and according to this state signal, produces this controlling signal and be back to this auxiliary operation unit, and these sub-bands of encoding.

8. acoustics as claimed in claim 7, it is characterized in that, this auxiliary operation unit is divided into those sub-bands with this sound signal, utilize this Improvement type digital cosine conversion and the conversion of this Improvement type digital sine, analyze this sound signal, to produce a cosine transfer function and a sinusoidal transfer function and according to one first table of comparisons and one second table of comparisons, calculate this cosine transfer function and this sine transfer function respectively, to produce cosine multiplication function and a sinusoidal multiplication function is integrated this cosine multiplication function and this sine multiplication function again, so that this sound signal is divided into these sub-bands.

9. acoustics as claimed in claim 8, it is characterized in that, this auxiliary operation unit produces this cosine transfer function and this sine transfer function, by reconfiguring a plurality of output points of this sound signal, and utilize this Improvement type digital cosine conversion and this Improvement type digital sine to change, merge these output points, to produce a plurality of complex function; This auxiliary operation unit is respectively at after rotating these complex function then, get the conjugate complex number of these complex function, forming a plurality of conjugate functions, and utilize this fast fourier transform, come these conjugate functions of computing, to produce the corresponding transfer function of these conjugate functions; After then the conjugate complex number of these transfer functions is got in this auxiliary operation unit, rotate the conjugate complex number of these transfer functions, to produce a plurality of reduction transfer functions; This auxiliary operation unit sort again these the reduction transfer functions, to produce this cosine transfer function and this sine transfer function.

10. acoustics as claimed in claim 8 is characterized in that, this first table of comparisons is a SIN function table of comparisons, and this second table of comparisons is a cosine function table of comparisons.

11. the method for a voice signal coding is characterized in that, comprises:

Import sound signal to a voice signal coding system;

Utilize a cosine-modulated filter row, a fast fourier transform, Improvement type digital cosine conversion and Improvement type digital sine conversion that this sound signal is divided into a plurality of sub-bands, wherein this fast fourier transform is in order to realize this cosine-modulated filter row;

State according to sound signal being divided into these sub-bands produces a controlling signal, and produces follow-up sub-band according to this controlling signal; And

These sub-bands of encoding.

12. the method for voice signal coding as claimed in claim 11 is characterized in that, this sound signal is divided into the step of these sub-bands, comprises:

Utilize this Improvement type digital cosine conversion and the conversion of this Improvement type digital sine, analyze this sound signal, to produce a cosine transfer function and a sinusoidal transfer function;

According to one first table of comparisons and one second table of comparisons, calculate this cosine transfer function and this sine transfer function respectively, to produce a cosine multiplication function and a sinusoidal multiplication function;

Integrate this cosine multiplication function and this sine multiplication function, to produce these sub-bands.

13. the method for voice signal coding as claimed in claim 12 is characterized in that, produces the step of this cosine transfer function and this sine transfer function, comprises:

Reconfigure a plurality of output points of this sound signal;

Utilize this Improvement type digital cosine conversion and the conversion of this Improvement type digital sine, merge these output points, to produce a plurality of complex function;

After these complex function of rotation, get conjugate complex number, to form a plurality of conjugate functions;

Utilize this fast fourier transform, come these conjugate functions of computing, to produce the corresponding transfer function of these conjugate functions;

After getting the conjugate complex number of these transfer functions, rotate these conjugate complex numbers, to produce a plurality of reduction transfer functions; And

Sort these the reduction transfer functions, to produce this cosine transfer function and this sine transfer function.

14. the method for voice signal coding as claimed in claim 12 is characterized in that, this first table of comparisons is a SIN function table of comparisons, and this second table of comparisons is a cosine function table of comparisons.

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