CN1215875A - Device and method for rising and lowering tone of digital sound signals - Google Patents
Device and method for rising and lowering tone of digital sound signals Download PDFInfo
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Abstract
A tone regulation device for digital audio signals is used to receive digital audio signals and convert their frequency, and is composed of an input unit for receiving digital audio signals, a tone processing unit for sampling a particular period of digital audio signals to raise or lower its tone and obtain a frequency-varying audio frame, and an audio signal linking unit for linking the frequency-varying audio frame with frequency-varied audio signals to obtain new frequency-varied audio signals. Said audio signal linking unit is composed of potential level comparators for search area and link area, bit cell processor and linking unit.
Description
The present invention relates to a kind of tone lifting (pitch shift) device and method of digital audio and video signals, and particularly relate to a kind of in the tone jacking gear of not accordatura frame split plot design (unlimited audio framedivision method), in order to be connected the method for point between fast searching (fast searching) two sound frames.
In the tone lifting of digital audio and video signals was handled, the simplest way was exactly that the frequency of playback is accelerated (tone rising) or slack-off (tone reduction), as with disc record faster rotational speed or the reason that slows down.But this way but can change the reproduction time length of original audio signal.Therefore, how to possess the reproduction time length of original audio signal, and reach the effect of tone lifting simultaneously, just become the tone lifting handle in first of want problem.
Once proposed a kind of not accordatura frame split plot design during Mr. Chen Siping is at its Master's thesis " mpeg decode, pitch adjustment and time message processing algorithm research (On Audio Processing For MPEG Decoding; Pitch-shifting and Sub-band Coding) of coding frequently ", it is roughly as follows that it implements situation:
One, at first by the sound frame (audioframe) that takes out a sample number N in the original audio signal;
Two, the sample in the above-mentioned sound frame being carried out the tone lifting handles;
Three, (m＞1 is flat to suppose sound frame playback length behind the lifting frequency to become mN; M＜1 is a sharp), then determine next sound frame to be mN N sample that sample point begins in original sound frame;
Four, each sample in the new sound frame being carried out the tone lifting described in the step 2 handles;
Five, find out the best point (optimum connecting point) that is connected to be connected above-mentioned two sound frames;
Six, the sample number of supposing to be connected back sound frame is 2mN-X, the sample number of X for casting out because of linking, and then next sound frame is 2mN-X N sample that sample point begins in original audio signal again; And
Seven, heavily cover step 4 to step 6, finish up to tone lifting processing.
In the tone lifting of this not accordatura frame split plot design is handled, the linking point of step 5 is searched and bridging mode is that the latter end data (promptly what is called search is distinguished (search region) hereinafter) of utilizing previous sound frame is carried out numerical value contrast (with the foundation of average absolute value difference (mean absolutelyerror) MAE as the best linking point of judgement) with the leading portion data (the promptly so-called hereinafter district (cross region) that is connected) of next sound frame, use obtaining the most similar bridging mode, it is as follows with reference to equation:
Wherein, C is for being connected district's sample, and sample number is M; S is for searching district's sample, and sample number is N and N＞M: it then is the sample that can make MAE have minimum value that the best is connected point, promptly is connected district's sample and the most similar position of sample, search district.
Then carry out as for being connected action according to following formula:
Wherein, i is the best position that is connected point: the sample of P for being connected then is the sample of a time sound frame after the P.
Please refer to Fig. 1, synoptic diagram is handled in this digital audio and video signals tone lifting under the flat situation for not accordatura frame split plot design.
In this legend, suppose that original audio signal S0 is one group of digital audio and video signals that is made of a plurality of continuous number signals.At first, select one of time span L1 group sound frame D1 since then among the original audio signal S0, as indicating the sample between 0 to L1-1 among the figure.Then, this sound frame D1 is carried out the tone flat handles (as changing its broadcasting speed), then the time of playback elongated be L2, use the frequency reducing sound signal D1 ' that obtains one group of time span L2.
And then, locate with a last sound frame D1 starting point among the original audio signal S0 (promptly indicate 0 time) back distance L 2 time spans (be frequency reducing after sound frame time span) again, backward access time one of length L 1 group sound frame D2, as indicating the sample between the L1 to L1+L2-1 among the figure.And in kind sound frame D2 is carried out the tone flat and handle, nationality is to obtain the frequency reducing sound frame D2 ' of one group of time span L2.
Then, carry out the linking action of frequency reducing sound signal D1 ' and D2 '.At first, choose the part sample of frequency reducing sound signal D1 ' back segment and the part sample of original audio signal S0 and its back segment adjacency and distinguish Sa, and the part sample of frequency reducing sound frame D2 ' leading portion is for being connected district Ca for searching.Then, contrast is connected district Ca and searches each sample among the district Sa, and obtains frequency reducing sound frame D1 ' according to above-mentioned mathematical expression and be connected some K1 with the best of between D2 ', uses the action of finishing linking and obtains a frequency reducing sound signal S0 '.
Then, heavily be covered with and state step and finish up to whole down conversion process.
The tone lifting processing synoptic diagram of digital audio and video signals under the sharp situation of then representing not accordatura frame method as for Fig. 2.
In legend, suppose that original audio signal S1 is one group of digital audio and video signals that is made of a plurality of continuous number signals.At first, in original audio signal S1, select one of time span L3 group sound frame D3, as indicating the sample between 0 to L3-1 among the figure.Then, this sound frame D3 is carried out the tone sharp handle (as accelerating its broadcasting speed), then the time of playback shortens to L4, uses the raising frequency sound signal D3 ' that obtains one group of time span L4.
And then, locate with a last sound frame D3 starting point among the original audio signal S1 (promptly indicate 0 time) back distance L 4 length (be raising frequency after sound frame time span) again, backward access time one of length L 3 group sound frame D4, as indicating the sample between the L3 to L3+L4-1 among the figure.And in kind sound frame D4 is carried out the tone sharp and handle, use the raising frequency sound frame D4 ' that obtains one group of sample number L4.
Then, carry out the linking action of raising frequency sound signal D3 ' and raising frequency sound frame D4 '.
At first, choose the part sample of raising frequency sound signal D3 ' back segment and the part sample of original audio signal S1 and its back segment adjacency and distinguish Sb, and the part sample of raising frequency sound frame D4 ' leading portion is for being connected district Cb for searching.Then, contrast is connected district Cb and searches each sample among the district Sb, and obtains raising frequency sound signal D3 ' according to above-mentioned mathematical expression and be connected some K2 with the best of between D4 ' of raising frequency sound frame, uses the action of finishing linking and obtains a raising frequency sound signal S1 '.
And, heavily be covered with and state step and finish dealing with up to raising frequency.
But, the tone lifting of this not accordatura frame split plot design is handled under N=160, M=80, playback are 16 kilo hertzs situation frequently, per 10 milliseconds must be carried out 80=12720 plus and minus calculation of (80+79) * (being to carry out 1272000 times plus and minus calculation p.s. at least), and such computing cost is too big really.Therefore, not accordatura frame split plot design is applied in the consumer products, just must find a kind of simple and easy effective linking point searching method, and this method be wanted and can be finished with simple hardware circuit.
In view of this, fundamental purpose of the present invention is providing a kind of tone jacking gear and method of digital audio and video signals exactly, and it utilizes the bit computing to simplify the search that is connected point between two sound frames, therefore can reduce the computing cost in a large number and reach with simple and easy hardware circuit to finish.
For reaching the present invention's above-mentioned and other purpose, the present invention is the tone elevating method that proposes a kind of digital audio and video signals, in order to receiving a digital audio and video signals, and its frequency is changed, and uses obtaining a frequency conversion sound signal.Its step comprises: at first, the sample of choosing length-specific R in the digital audio and video signals is that the first original sound frame carries out frequency inverted, and after the frequency conversion, time span becomes L ' by original L, use obtain time span L ' the first sound frame as the frequency conversion sound signal.Then, to begin to choose R sample be that the second original sound frame carries out frequency inverted L ' time place in this original digital audio signal certainly, uses the second frequency conversion sound frame that obtains a new time span L '.Then, be connected this second frequency conversion sound frame and this frequency conversion sound signal, use the frequency conversion sound signal that obtains upgrading the back.And, heavily cover preceding two steps of step, use the tone lifting of finishing this digital audio and video signals.
Wherein, the step of aforementioned linking comprises: at first, the sample that self frequency-changing's signal back segment is chosen length N is for searching the district, and will search that each sample and reference potential compare in the district, use obtaining a search position unit data (bit sequence), represent the amplitude situation of each sample in this search district.Then, (N＞M) usually, and will be connected each sample of district and reference potential relatively uses obtaining one and be connected position unit data, the amplitude situation of each sample during the expression linking is distinguished to the sample of choosing length M from the second frequency conversion sound frame leading portion as being connected the district.At last, relatively be connected the district and search the bit data in the child search district of all length M in the district, use the dissimilar degree (non-similarity) that obtains correspondence with the bit manner of comparison; And, will be connected the middle linking in child search district (sub-search region) of district and correspondence, use the frequency conversion sound signal that obtains upgrading the back.
In addition, the bit that is connected the district among the present invention and searches the child search district of each length M in the district relatively can be finished by the xor logic circuit, and the dissimilar degree of its correspondence then is 1 a number among the xor logic circuit output result.
In addition, the present invention also provides a kind of tone jacking gear of digital audio and video signals, in order to receiving a digital audio and video signals, and its frequency is changed.It mainly comprises an input media, a tone treating apparatus and a sound signal connecting device.Input media is to be used for receiving digital audio and video signals.The tone treating apparatus is to be used for choosing the sample of length-specific in the digital audio and video signals to carry out tone lifting processing and to obtain a frequency conversion sound frame.The sound signal connecting device then is that frequency conversion sound frame is connected with the frequency conversion sound signal, uses to obtain new frequency conversion sound signal.Again, the sound signal connecting device can comprise: one searches district's current potential comparison means, is that the sample of N serves as to search district's sample to compare with segment length after the frequency conversion sound signal, uses obtaining a bit data of searching district's sample; One is connected district's current potential comparison means, is that the sample of M serves as to be connected district's sample to compare with segment length before the frequency conversion sound frame, uses obtaining a bit data that is connected district's sample; One bit treating apparatus, the bit data of the child search district sample that the sample of all length M is formed in the bit data of contrast linking district sample and the search district sample is used the dissimilar degree that obtains correspondence; And a connecting device, the child search district sample of choosing minimum dissimilar degree is to carry out and being connected of frequency conversion sound frame and frequency conversion sound signal.
State with other purposes, feature and advantage and can become apparent on the present invention for allowing, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below, among the figure:
Fig. 1 handles synoptic diagram for the tone lifting of digital audio and video signals under the flat situation of not accordatura frame split plot design;
Fig. 2 handles synoptic diagram for the tone lifting of digital audio and video signals under the sharp situation of not accordatura frame split plot design;
Fig. 3 A and Fig. 3 B are respectively the synoptic diagram of searching district's sample in the tone jacking gear of digital audio and video signals of the present invention and the method and being connected district's sample;
Fig. 4 is the circuit block diagram of the tone jacking gear of digital audio and video signals of the present invention and the synoptic diagram of disposal route thereof:
Fig. 5 is the processing synoptic diagram of the tone elevating method medium pitch lifting of digital audio and video signals of the present invention.
From the above, because handling, the tone lifting of not accordatura frame split plot design seeing that having in the method is to utilize average absolute value difference (being above-mentioned mathematical expression) as the foundation that is connected the some search, therefore, sizable computing cost and hardware cost must be spent and the search that is connected point can be reached.
In addition, in the tone of digital audio and video signals was handled, because the time span very little (usually between 20 to 30 milliseconds) of a sound frame, the data in the sound frame had statistics and goes up constant characteristic (stationary).And, because each sample is formed in the two adjacent tone frames waveform shape, amplitude, size are all very similar, and the difference of tone information is often from the amplitude up and down of the waveform of each sample composition, therefore, being connected an amplitude up and down of the waveform of the sample composition that just can only distinguish and be connected the district at search compares and obtains.
And the present invention just provides a kind of tone jacking gear and method of digital audio and video signals in the mode of bit comparison according to this specific character, it is only just searched, and lower swing compares on district and the linking district, is connected computing, the hardware cost that some search is spent between the sound frame so can reduce in a large number.
Please refer to Fig. 5, this is the processing synoptic diagram of the tone elevating method medium pitch lifting of digital audio and video signals of the present invention, in order to receiving a digital audio and video signals, and its frequency is changed, and uses obtaining a frequency conversion sound signal.
At first, the sample of choosing length-specific in this digital audio and video signals is that the first original sound frame carries out frequency inverted, use obtain a time length L 6 the first sound frame as this frequency conversion sound signal.
In legend, suppose that original audio signal S2 is by one group of digital audio and video signals that is made of a plurality of continuous number signals, as shown in Fig. 1 and Fig. 2.At first, in original audio signal S2, select the sound frame of time span L5 (promptly indicating the sample between 0～L5-1 among the figure) as the first original sound frame D5.Then, the first original sound frame D5 is carried out the tone lifting handle (as accelerating or slowing down its broadcasting speed), then the time of playback shortens or increases becomes L6, use obtain one group of time span L6 the first sound frame D5 ' as desired frequency conversion sound signal S2 '.
Then, choose in this digital audio and video signals sample (promptly indicating the sample between L6～L5+L6-1 among the figure) from the L5 time span of this first original sound frame time L6 place (the time length of the first sound frame after being frequency conversion) beginning and be the second original sound frame D6 and carry out the tone lifting and handle, use the second frequency conversion sound frame D6 ' that obtains one group of time span L6.
Then, carry out the linking of frequency conversion sound signal D5 ' and frequency conversion sound frame D6 '.
Being different from existing is to utilize the mode of bit comparison to lower the complexity of existing numerical value contrast among the present invention.
Please refer to Fig. 3 A and Fig. 3 B, it is used for representing the synoptic diagram of searching the district and being connected district's sample in the tone elevating method of digital audio and video signals of the present invention respectively.Wherein, searching district Sc can be N the sample of choosing from the digital sound frame S2 of frequency conversion sound signal D5 ' back segment and adjacency.Being connected district Cc then can be from M selected sample of second frequency conversion sound frame D6 ' leading portion.
And, in this step, search district Sc and why comprise that part is reasonably to be connected point in order to seek one in abutting connection with digital audio and video signals.And by the linking of several frequency conversion sound frames, as the linking of D5 ' and D6 ', make frequency conversion after whole playing time more approach former digital audio and video signals S2.
Again, please refer to Fig. 4, this tone for the tone elevating method of digital audio and video signals of the present invention is handled synoptic diagram.Wherein, in order to save computing and hardware cost, at first, to search district Sc and be connected the interior sample of district Cc and carry out current potential relatively through one group of current potential comparison means 20,30, use the sample output " 1 " that makes greater than reference potential Vref (as 0V), sample less than reference potential is then exported " 0 ", respectively representative search district Sc and be connected district Cc sample the situation of amplitude up and down and respectively as searching the position data Sd of unit and being connected the data Cd of position unit.
Then, relatively be connected district Cc and search the bit data that respectively has the child search district Ssub that is connected district Cc length among the district Sc with the bit manner of comparison.And calculate representative in the result of this xor logic circuit and be connected the different bit number of bit data that district Cc and each son are searched district Ssub, use as being connected district Cc and each son is searched the dissimilar degree of district Ssub correspondence.In the present embodiment, the way of contrast that is connected district sample Cc and each son search district sample Ssub can be finished with an XOR arithmetic unit, promptly calculate and represent 1 bit number (being the different number of bit data) among the XOR computing gained result, in order to dissimilar degree as its correspondence.
At last, to be connected district Cc is connected with the child search district that son is searched corresponding minimum dissimilar degree among the district Ssub and (for example calculates in the result of this xor logic circuit 1 number with a counting assembly and distinguish corresponding dissimilar degree as each son search, and with each dissimilar degree of digital comparator comparison, use the child search district that obtains minimum dissimilar degree correspondence and the sample K of correspondence thereof), use obtaining new frequency conversion sound signal S2 '; And, heavily be covered with and state step to finish whole tone lifting processing.
In the method, because digital audio and video signals is subdivided into about 20～30 milliseconds sound frame of length, and being connected district Cc and son, to search the contrast of district Ssub be to finish with a current potential comparison means, so the cost of circuit can lower, and can be useful in the general tone treating apparatus.
In addition, the present invention also provides the accessory of a digital audio and video signals, and it one of forms digital audio and video signals in regular turn in order to receive by a plurality of samples, and to a frequency conversion sound signal of converting.This device mainly comprises: an input media, a tone treating apparatus and a sound signal connecting device.Input media is to be used for receiving digital audio and video signals.The tone treating apparatus is to carry out the tone lifting in order to the sample of choosing a length-specific in the digital audio and video signals to handle, and uses obtaining a frequency conversion sound frame.The sound signal connecting device then is connected frequency conversion sound frame in the frequency conversion sound signal, uses to obtain new frequency conversion sound signal.
Wherein, the sound signal connecting device comprises: one searches district's current potential comparison means 20, is connected district's current potential comparison means 30, a bit processing unit 40 and a connecting device 50.
Search among the digital audio and video signals S2 that district's current potential comparison means 20 is self frequency-changing's sound signal S2 ' back segment and adjacency thereof and choose length-specific, carry out current potential relatively as N sample as searching the district, use obtaining a search position data Sd of unit, search the amplitude of each sample in the district Sc corresponding to this.As: the sample of in the digital audio and video signals S2 of sound frame D5 ' back segment and adjacency, choosing length N as searching the district, and with a current potential comparison means 20 with it and a reference potential, compare as 0V, use the bit data that obtains a sound frame D5 '.
Be connected district's current potential comparison means 30 and then carry out current potential relatively as being connected the district, use obtaining one and be connected the data Cd of position unit, be connected the amplitude situation of each sample in the district Cc corresponding to this from the sample that second frequency conversion sound signal D6 ' leading portion is chosen length M.As: compare a reference potential with a current potential comparison means 30,, use the bit data that obtains a sound frame D6 ' as the sample of 0V and sound frame D6 ' leading portion length M.
Bit treating apparatus 40 is the bit datas that are used for contrasting the child search district Ssub that the sample of each length M among this linking district Cc and this search district Sc forms, and uses the dissimilar degree that obtains a correspondence.As, utilize an xor logic circuit to contrast the similarities and differences of each bit in the bit data of sound frame D5 ' and D6 ' in regular turn, and calculate the number (reaching) of bit among this result " 1 " or " 0 " as utilizing counter, use dissimilar degree as correspondence.
Connecting device 50 is then found out the child search district of minimum dissimilar degree correspondence and the sample k of correspondence thereof, and this frequency conversion sound frame D6 ' is connected in this frequency conversion sound signal D5 ', uses to obtain this new frequency conversion sound signal S2 '.As, with comparer all dissimilar degree relatively, and therefrom obtain a child search district sample with minimum dissimilar degree, then, be the linkings point of sound frame D5 ' and D6 ' with the starting point (as sample point K) of this height search district sample, use linking two frequency conversion sound frames.
In sum, the tone treating apparatus of digital audio and video signals of the present invention and method can be used simple circuit and just finish in the tone lifting processing of not accordatura frame split plot design, linking between each sound frame, the cost of its minimizing computing and hardware can apply in the general tone disposal system at the most.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this operator, without departing from the spirit and scope of the invention; change and modification when making, so the present invention's protection domain is as the criterion when looking appended claims person of defining.
Claims (12)
1. the tone elevating method of a digital audio and video signals in order to receiving a digital audio and video signals, and is changed its frequency, uses obtaining a frequency conversion sound signal, it is characterized in that this method comprises the following steps:
(a) sample of choosing length-specific R in this digital audio and video signals is that the first original sound frame carries out frequency inverted, and this first original sound frame time span after frequency conversion becomes L ' by L, use obtain a time length L ' the first sound frame as this frequency conversion sound signal;
(b) sample with the length-specific R of L ' time place beginning in this original digital audio signal is that the second original sound frame carries out frequency inverted, use obtain a time length L ' the second frequency conversion sound frame;
(c) be connected this second frequency conversion sound frame and this frequency conversion sound signal, use the frequency conversion sound signal that obtains upgrading the back; And
(d) heavily cover step (b), (c), use the tone lifting of finishing this digital audio and video signals;
Wherein, step (c) comprising:
In the digital audio and video signals of this frequency variation signal back segment and adjacency thereof, choose the sample of length N and search the district as one, and should search each sample and reference potential comparison in the district, use obtaining a search position unit data, represent the amplitude situation of each sample in this search district;
The sample of choosing length M from this second frequency conversion sound frame leading portion is connected the district as one, and should be connected each sample of district and compare with this reference potential, uses obtaining the first data in a linking position, represents the amplitude situation of each sample in this linking district;
Relatively be somebody's turn to do the bit data that is connected the child search district of all length M in district and this search district with the bit manner of comparison, use obtaining the dissimilar degree that this linking district reaches the interval correspondence of this a little search; And
The child search district that should be connected corresponding minimum dissimilar degree in district and this a little search district is connected, and uses the frequency conversion sound signal that obtains upgrading the back.
2. tone elevating method as claimed in claim 1, wherein, the formation step that this search district and this be a little searches the dissimilar degree of interval correspondence comprises:
Relatively be somebody's turn to do the bit data that is connected the child search district of each length M in district and this search district with the bit manner of comparison, use obtaining a dissimilar degree bit data; And
Calculate and represent the different bit number of bit in this dissmilarity degree bit data, use dissimilar degree as this linking district and this child search district correspondence.
3. tone elevating method as claimed in claim 1, wherein, this length N of searching district's sample is connected the length M of district's sample greater than this.
4. tone elevating method as claimed in claim 3, wherein, this search district sample is made up of a N sample of section after in this frequency conversion sound signal.
5. tone elevating method as claimed in claim 1, wherein, it is to finish with an XOR step that this bit contrasts in this search district sample and this linking district sample all steps with child searches buffering sound frame of the continuous sample composition of length M.
6. tone elevating method as claimed in claim 5, wherein, this dissmilarity degree is by bit among the result of this XOR step " 1 " number represent.
7. the tone jacking gear of a digital audio and video signals in order to receiving a digital audio and video signals, and is changed its frequency, uses obtaining a frequency conversion sound signal, it is characterized in that this tone jacking gear comprises:
One input media is in order to receive this digital audio and video signals;
One tone treating apparatus carries out the tone lifting in order to the sample of choosing a length-specific in this digital audio and video signals and handles, and nationality is to obtain a frequency conversion sound frame; And
One sound signal connecting device is connected this frequency conversion sound frame in this frequency conversion sound signal, uses the frequency conversion sound signal after obtaining upgrading:
Wherein, this sound signal connecting device comprises:
The current potential comparison means is distinguished in one search, and the sample of choosing length N certainly in the digital audio and video signals of this frequency conversion sound signal back segment and adjacency thereof compares for the search district carries out current potential, uses obtaining a search position unit data, represents the amplitude situation of each sample in this search district;
One is connected district's current potential comparison means, and this frequency conversion sound frame leading portion sample of choosing length M carries out current potential relatively for being connected the district certainly, uses obtaining one and be connected position unit data, represents the amplitude situation of each sample in this linking district;
One bit treating apparatus contrasts the bit data of the child search district sample that the sample of each length M in this linking district and this search district forms, and uses the dissimilar degree that obtains this linking district and this child search district correspondence; And
One connecting device should be connected the child search district linking of corresponding minimum dissimilar degree in district and this a little search district, used the frequency conversion sound signal after obtaining upgrading.
8. tone jacking gear as claimed in claim 7, wherein, this linking district current potential comparison means is to carry out current potential relatively with a reference potential.
9. tone jacking gear as claimed in claim 7, wherein, this search district current potential comparison means is to carry out current potential relatively with a reference potential.
10. tone jacking gear as claimed in claim 8 or 9, wherein, this reference potential is 0V.
11. tone jacking gear as claimed in claim 7, wherein, this bit treating apparatus is the logical circuit of an execution XOR computing.
12. tone jacking gear as claimed in claim 7, wherein, this dissmilarity degree is by bit among the result of this XOR step " 1 " number represent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97119196 CN1091917C (en) | 1997-10-28 | 1997-10-28 | Device and method for rising and lowering tone of digital sound signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97119196 CN1091917C (en) | 1997-10-28 | 1997-10-28 | Device and method for rising and lowering tone of digital sound signals |
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| Publication Number | Publication Date |
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| CN1215875A true CN1215875A (en) | 1999-05-05 |
| CN1091917C CN1091917C (en) | 2002-10-02 |
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| CN 97119196 Expired - Fee Related CN1091917C (en) | 1997-10-28 | 1997-10-28 | Device and method for rising and lowering tone of digital sound signals |
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| Country | Link |
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| CN (1) | CN1091917C (en) |
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| CN1091917C (en) | 2002-10-02 |
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