CN1331340C

CN1331340C - Sound code cut-over method and device and sound communication terminal

Info

Publication number: CN1331340C
Application number: CNB011407468A
Authority: CN
Inventors: 山浦正; 田崎裕久
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2001-01-18
Filing date: 2001-08-17
Publication date: 2007-08-08
Anticipated expiration: 2021-08-17
Also published as: TW515191B; JP2002215193A; CN1366412A

Abstract

Because the encoding and decoding of the high efficiency voice encoding method are performed by using information in the frame and the bygone encoding and bygone decoding results of the frame, an output voice becomes discontinuous when a voice sign is received at a terminal and switched in the middle of sign series to be decoded, and the continuous interrupts of bygone encoding. In a voice sign switching method which receives a voice sign A in which a voice inputted by a speaker A is encoded and a voice sign B in which at voice inputted by a speaker B is encoded, and selects and outputs either the voice signs A and B for every frame for a prescribed time, the selection control of an output frame is performed on the basis of a bygone selection result.

Description

Sound sign indicating number changing method

Technical field

The voice communication terminal that the present invention relates to sound sign indicating number changing method and sound sign indicating number switching device shifter and use sound sign indicating number changing method, can be used in a plurality of terminal rooms share two circuits and can by other two terminal rooms of terminal monitoring conversation sound communication system and realize the sound transmitting system etc. of the conference call of many intersites, particularly relate to digital audio communication system and the digital audio transmitting system of using high efficiency sound encoding system and be used for wherein sound sign indicating number changing method.

Background technology

In service communication etc., utilize other relevant members can monitor the sound communication system of two business contact conversations between the caller.Existing sound communication system as such has: overlapping two sound on analoging sound signal send this overlapping signal by a side circuit.For example, use such method: when between caller A and caller B, conversing, terminal A place in caller A side overlaps the voice signal of the caller B that receives on the voice signal of caller A, and overlapping voice signal is sent to the terminal B of caller B side and other terminal.

Figure 22 represents all formations of existing sound communication system.

In the drawings, the 1st, the terminal A that caller A uses, the 2nd, the terminal B that caller B uses, the 3rd, employed terminal C when other relevant members monitor.

In terminal A, be provided with: the modulation signal B that comes self terminal B is carried out demodulation and becomes the sound import A of the analog demodulator device 4 of output sound A, overlapping caller A pronunciation and above-mentioned output sound A and the analog-modulated device 6 that generates the sound overlapping device 5 of overlapping sound, overlapping sound is modulated.

In terminal B, be provided with: the analog-modulated device 7 that the sound import B of caller B pronunciation is modulated, the analog demodulator device 8 that the modulation signal A that comes self terminal A is carried out demodulation.

And, in terminal C, be provided with the analog demodulator device 9 that the modulation signal A that comes self terminal A is carried out demodulation.

And, the 10th, transmission comes the circuit A of the modulation signal A of self terminal A, and the 11st, transmission comes the circuit B of the modulation signal B of self terminal B.

With reference to the accompanying drawings the action of this existing sound communication system is described below.

To the sound of terminal A as sound import A input caller A pronunciation.And, by circuit B from terminal B input modulating signal B described later.4 couples of above-mentioned modulation signal B of analog demodulator device carry out demodulation, export resulting voice signal as output sound A.In sound overlapping device 5, generate above-mentioned sound import A and output sound A are carried out overlapping overlapping sound, its input analog-modulated device 6.Analog-modulated device 6 is modulated the overlapping sound of being imported, and resulting modulation signal is outputed among the circuit A as modulation signal A.

In terminal B, import the sound of caller B pronunciation as sound import B to analog-modulated device 7.And, by circuit A from terminal A to analog demodulator device 8 input modulating signal A.7 couples of above-mentioned modulation signal B of analog demodulator device carry out demodulation, and resulting voice signal is outputed among the circuit B as output sound B.8 couples of above-mentioned modulation signal A of analog demodulator device carry out demodulation, and resulting voice signal is exported as output sound B.

Pass through circuit A to terminal C input modulating signal A from terminal A.9 couples of above-mentioned modulation signal A of analog demodulator device carry out demodulation, and resulting voice signal is exported as output sound C.

By formation as described above, when caller A and caller B use separately terminal A and terminal B when conversing, the conversation that can monitor caller A and caller B in terminal C.

Figure 23 is the another kind of figure that constitutes of expression, in above-mentioned existing sound communication system, in order to improve the circuit utilization ratios such as importing of data communication, quality in the more weak area of electric wave in the radio communication that combination produced of improvement and error correcting code, guarantee confidentiality that combination produced with password etc., and seek the digitlization of system.

In terminal A, be provided with: the demodulating equipment 12 that the modulation signal B that comes self terminal B is carried out demodulation, to the sound decoding device 13 of decoding by demodulating equipment 12 resulting sound sign indicating number B, to the output of sound decoding device 13 carry out digitaltoanalogconversion (D-A conversion) and output as the D-A converting means 14 of the output sound A of analog signal, the sound import A of caller A pronunciation and the output sound A of above-mentioned D-A converting means 14 are carried out overlapping sound overlapping device 15, overlapping sound is carried out the A-D converting means 16 of analog-to-digital conversion (A-D conversion), the sound coder 17 that the output of A-D converting means 16 is encoded, the output of sound coder 17 is carried out digital modulation and outputed to modulating device 18 among the circuit A 10.

In terminal B, be provided with: to the modulation signal A that comes self terminal A carry out the modulating device 20 of demodulation, sound decoding device 21 that the output of modulating device 20 is decoded, the output of sound decoding device 21 carried out digitaltoanalogconversion (D-A conversion) and output as the D-A converting means 22 of the output sound B of analog signal.

Terminal B also comprises: the sound import B of caller B pronunciation is carried out the A-D converting means 23 of analog-to-digital conversion (A-D conversion), sound coder 24 that the output of A-D converting means 23 is encoded, the output of sound coder 24 carried out digital modulation and outputed to modulating device 25 among the circuit B 11.

In terminal C, be provided with: to the modulation signal A that comes self terminal A carry out the demodulating equipment 26 of demodulation, sound decoding device 27 that the output of demodulating equipment 26 is decoded, the output of sound decoding device 27 carried out digitaltoanalogconversion (D-A conversion) and output as the D-A converting means 28 of the output sound B of analog signal.

Action to existing this sound communication system describes below.

To the sound of terminal A as sound import A input caller A pronunciation, and, by circuit B from terminal B input modulating signal B described later.12 couples of above-mentioned modulation signal B of demodulating equipment carry out demodulation, and resulting sound sign indicating number B is exported to sound decoding device 13.13 pairs of tut sign indicating numbers of sound decoding device B decodes, and resulting digital output sound A is exported to D-A converting means 14.14 couples of above-mentioned digital output sound A of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound A of analog signal.

And, in terminal A, above-mentioned sound import A and output sound A are carried out overlapping overlapping sound by 15 generations of sound overlapping device, it is exported to A-D converting means 16.16 pairs of overlapping sound of being imported of A-D converting means carry out analog-to-digital conversion (A-D conversion), obtain the digital sound import A as digital signal.Sound coder 17 is encoded above-mentioned digital sound import A, and resulting sound sign indicating number A is exported to modulating device 18.The sound sign indicating number A that 18 pairs of modulating devices are imported carries out digital modulation, and resulting modulation signal is exported to circuit A as modulation signal A.

In terminal B, the sound of input caller B pronunciation is as sound import B.And, by circuit A from terminal A input modulating signal A.23 couples of above-mentioned sound import B of A-D converting means carry out analog-to-digital conversion (A-D conversion), and obtain the digital sound import B as digital signal.24 couples of above-mentioned digital sound import B of sound coder encode, and resulting sound sign indicating number B is exported to modulating device 25.The sound sign indicating number B that 25 pairs of modulating devices are imported carries out digital modulation, and resulting modulation signal is exported to circuit B as modulation signal B.

20 couples of above-mentioned modulation signal A of modulating device in the terminal B carry out demodulation, and resulting sound sign indicating number A is exported to sound decoding device 21.21 pairs of tut sign indicating numbers of sound decoding device A carries out demodulation, and resulting digital output sound B is exported to D-A converting means 22.22 couples of above-mentioned digital output sound B of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound B of analog signal.

Pass through circuit A to terminal C input modulating signal A from terminal A.26 couples of above-mentioned modulation signal A of modulating device carry out demodulation, and resulting sound sign indicating number A is exported to sound decoding device 27.27 pairs of tut sign indicating numbers of sound decoding device A carries out demodulation, and resulting digital output sound C is exported to D-A converting means 28.28 couples of above-mentioned digital output sound C of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound C of analog signal.

By formation as described above, even in digital communication system, identical with existing analog communication system, when caller A and caller B use separately terminal A and terminal B when conversing, the conversation that can monitor caller A and caller B in terminal C.

Open to disclose among the clear 57-41064 the open communique spy of Japan Patent and can realize the tripartite digital platform trunk line of conversation simultaneously mutually.This numeral platform trunk line compares each caller and two other caller's sound PCM sign indicating number, selects the high side's of output level sound PCM sign indicating number in each sampling.By such formation, two other caller's sound PCM sign indicating number is once decoded, and addition, do not need to return to once more the PCM sign indicating number, can reduce hardware size.

In the CELP mode in extensive utilization in recent years is in the high efficiency sound coding mode of representative, has such feature: when the output sound that was obtaining when sound import was once being carried out coding and decoding is encoded once again or a plurality of callers' the sound of pronunciation simultaneously encoded, the coding quality is deterioration greatly, therefore, there is following problem: when using this high efficiency sound coding mode to realize digital communication system shown in Figure 23, coding quality badness in the sound coder 17 sends terminal B to by circuit A, the quality badness of the conversation sound of terminal C.

As the method for avoiding this problem, open clear 57-41064 with reference to the spy, consider such formation: switch the sound sign indicating number and export, so that the side among select a sound yard A and the sound sign indicating number B sends in terminal A.By such formation, can avoid repeatedly encoding and the coding of a plurality of callers' sound, still, there is following variety of issue and can not easily realizes.

And the spy opens clear 57-41064 and realized selecting a scheme of exporting from a plurality of sound sign indicating number, still, to each sampling, is defined as the sound PCM sign indicating number that can switch, and has following problems.

In the high efficiency sound coding mode, with 10～50ms as a frame, the a plurality of samplings that constitute this frame are encoded simultaneously, therefore, receive by terminal B, terminal C switching by the sound sign indicating number and the sign indicating number series of decoding in, switch or switch under the situation that the pith that causes the content of pronouncing loses in that sound sign indicating number A and sound sign indicating number B are frequent in the pronunciation of caller A or caller B by sign indicating number, this is lost length and reaches tens ms, therefore, in the assurance of dialog context, cause obstacle.

Under the situation of only switching sign indicating number by the size of the sound level in this frame, sign indicating number switches frequent the generation, therefore, to its decode and the output sound that obtains every tens ms and the pronunciation of handoff calls person A and caller B, can not correctly understand either party pronunciation content.

And, only by the size of the sound level in this frame, can not positively select the high caller's of the leading significance level of conversing sound sign indicating number, therefore, the pith of pronunciation content is lost, and causes obstacle in the assurance of dialog context.

And, because non-selected sound sign indicating number is dropped the caller's who then is dropped pronunciation contents lost.

And, the high efficiency sound coding mode does not only use and encodes, decodes with the information in this frame, and use coding result, the decoded result of frame in the past to encode, decode, therefore, receive by terminal B, terminal C switching by the sound sign indicating number and the sign indicating number series of decoding in, when switching the code of sound sign indicating number A and sound sign indicating number B halfway, cut off continuity with the decoded result in past, therefore, decode and the output sound that obtains becomes discontinuous.

When switching by sound when only exporting the sign indicating number series of forming by sound sign indicating number A and sound sign indicating number B, when this yard series is decoded, can not determine that sign indicating number switches the moment of taking place, therefore, can not judge whether the output sound of decoding and obtaining is discontinuous, and can not propose to solve discontinuous countermeasure.

And, in the sound communication system in service communication etc., during business between two callers contact conversation, need a certain side caller's indication and contact isopreference be transferred to other members that monitor.

Only switching by the size of sound level under the situation of sound sign indicating number A and sound sign indicating number B, needing the caller who preferentially sends not selected sometimes, thereby making the pronunciation contents lost of indication and contact etc.

And because the sign indicating number of sound import B is repeatedly transmitted, therefore, transmission error is accumulated, the quality badness of decoded voice.

Summary of the invention

In order to solve above-mentioned problem, the purpose of this invention is to provide a kind of sound sign indicating number changing method, can when using the advantage of high efficiency sound coding mode, performance realize high-quality conversation, monitoring and conference call etc.

Sound sign indicating number changing method involved in the present invention, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports

The selection of the frame of output is carried out according to the selection result in past.

And, sound sign indicating number changing method involved in the present invention, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports

Press N frame stored sound sign indicating number A and sound sign indicating number B,, select a sound sign indicating number A before the N frame or the side of sound sign indicating number B to export according to the sound sign indicating number A and the sound sign indicating number B of the N frame of this storage.

When selecting to judge sound sign indicating number A and sound sign indicating number B one side, when the output that is judged to be two sides all needs, the non-sign indicating number that selects a sound before storing successively in the frame, the output of the sound sign indicating number of selecting in preceding frame becomes after the unwanted frame, is sequentially output into the sound sign indicating number series of being stored for before the moment that does not need to export in chronological order.

And, sound sign indicating number changing method involved in the present invention, when exporting the sound sign indicating number series of above-mentioned storage in chronological order successively, the sound sign indicating number of present frame is configured in the end of this sound sign indicating number series, whole or the part of the sound sign indicating number series of storing when being judged to be is between non-sound zones the time, ends or abolish configuration to the end of this interval sound sign indicating number.

When receiving the predetermined input of the sound sign indicating number of selecting the indication either party from the outside, preferentially select this side's sound sign indicating number according to this predetermined input.

When sound sign indicating number A satisfied predetermined condition, a yard A preferentially selected a sound.

And, sound sign indicating number changing method involved in the present invention, the sound sign indicating number A that the sound import that is produced by caller A is encoded and to the sound import that is produced by caller B encode and modulate and the sound sign indicating number B that carries out demodulation as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports

Above-mentioned each sound sign indicating number is made of information code and its error correcting code of expression acoustic information, after sound sign indicating number B is carried out error correction decoding and error correction coding, selects to judge and output.

Even tut sign indicating number A and sound sign indicating number B are the scalable code structures that only uses its part also can decode to sound, made up as the sound sign indicating number A ' of the part of sound sign indicating number A and as the code of the sound sign indicating number B ' of the part of sound sign indicating number B as one of candidate of selecting output.

And, sound sign indicating number changing method involved in the present invention, the frame of the sound sign indicating number switching instant of selected output, before the output of this frame, output can identification selection sound sign indicating number information, after the output of this information, carry out the output successively of selected sound sign indicating number.

Sound sign indicating number switching device shifter involved in the present invention, comprise control device, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports

The selection of the frame that control device is exported according to the selection result in past.

Voice communication terminal involved in the present invention, comprise: demodulating equipment, even the sound sign indicating number A that encodes by the sound import that caller A produced and to the sound sign indicating number B that encodes by the sound import that caller B produced scalable code structure for only using its part also can decode to sound, made up as the sound sign indicating number A ' of the part of sound sign indicating number A and as the code of the sound sign indicating number B ' of the part of sound sign indicating number B as input, carry out demodulation; Separator separates the sound sign indicating number A ' of institute's demodulation with sound sign indicating number B '; Each sound decoding device is decoded separately respectively to sound sign indicating number A ' and the sound sign indicating number B ' that is separated, and output output sound A and output sound B; The add operation device is output sound A that is decoded and output sound B addition; The D-A converting means carries out the D-A conversion to the output of add operation device.

Description of drawings

Fig. 1 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 1;

Fig. 2 be the expression embodiments of the invention 1 sound sign indicating number changing method in the sign indicating number option program schematic diagram;

Fig. 3 is the schematic diagram of the another kind of sign indicating number option program in the sound sign indicating number changing method of expression embodiments of the invention 1;

Fig. 4 is the schematic diagram of the another kind of sign indicating number option program in the sound sign indicating number changing method of expression embodiments of the invention 1;

Fig. 5 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 2;

Fig. 6 be the expression embodiments of the invention 2 sound sign indicating number changing method in the sign indicating number option program schematic diagram;

Fig. 7 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 3;

Fig. 8 be the expression embodiments of the invention 3 sound sign indicating number changing method in the sign indicating number selection reference schematic diagram;

Fig. 9 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 4;

Figure 10 be the expression embodiments of the invention 4 sound sign indicating number changing method in the sign indicating number selection reference schematic diagram;

Figure 11 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 5;

Figure 12 be the expression embodiments of the invention 5 sound sign indicating number changing method in the sign indicating number selection reference schematic diagram;

Figure 13 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 6;

Figure 14 be the expression embodiments of the invention 6 sound sign indicating number changing method in the sign indicating number option program schematic diagram;

Figure 15 be the expression embodiments of the invention 7 sound sign indicating number changing method in the sign indicating number option program schematic diagram;

Figure 16 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 8;

Figure 17 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 8;

Figure 18 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 8;

Figure 19 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 9;

Figure 20 is the block diagram of all formations of the sound communication system of expression embodiments of the invention 9;

Figure 21 is the block diagram of the formation of the terminal in the sound communication system of the expression sound sign indicating number changing method that uses embodiments of the invention 10;

Figure 22 is the block diagram of all formations of the existing sound communication system of expression;

Figure 23 is the existing block diagram of seeking all formations of digitized sound communication system of expression.

Embodiment

Come with reference to the accompanying drawings embodiments of the invention are described.

Embodiment 1

Fig. 1 represents to use the formation of the terminal A of sound sign indicating number changing method of the present invention.And, use the terminal A of this terminal A as Figure 23, constitute the sound communication system of the sound sign indicating number changing method that uses embodiments of the invention 1 therefrom.In the drawings, the 16th, A-D converting means, the 17th, sound coder, the 30th, switching device shifter, the 18th, modulating device, the 12nd, demodulating equipment, the 13rd, sound decoding device, the 14th, D-A converting means.The 31st, the control device of formation switching device shifter 30,32 is the choice device that constitutes switching device shifter 30 equally.

Action is described below with reference to the accompanying drawings.

Import the sound of caller A pronunciation as sound import A to terminal A.And, by circuit B from terminal B input modulating signal B.In demodulating equipment 12 each frame at the fixed time above-mentioned modulation signal B is carried out demodulation, resulting sound sign indicating number B is exported to control device 31 and choice device 32 in sound decoding device 13 and the switching device shifter 30.13 pairs of tut sign indicating numbers of sound decoding device B decodes, and resulting digital output sound A is exported to D-A converting means 14.14 couples of above-mentioned digital output sound A of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound A of analog signal.

16 couples of above-mentioned sound import A of A-D converting means carry out analog-to-digital conversion (A-D conversion), and obtain the digital output sound A as digital signal.Above-mentioned digital output sound A is encoded in sound coder 17 each frame at the fixed time, resulting sound sign indicating number A is exported to switching device shifter 30 interior control device 31 and choice device 32.

In the selection result of the sound sign indicating number that the control device 31 in the switching device shifter 30 determines control device 31 from the sound sign indicating number A that imported and sound sign indicating number B and past according to predetermined selection criteria, select the side in sound sign indicating number A and the sound sign indicating number B, selected which relevant information to export to choice device 32 being.

An example as choice criteria, has such method: to sound sign indicating number A and actual decoding of sound sign indicating number B, according to the amplitude A of resulting two decoded voices and amplitude B and as in the past the selection m-1 of the selection result of (m-1 constantly), select according to flow process shown in Figure 2.

Fig. 2 represents: when the difference of vibration of two decoded voices during greater than threshold value th, select the big side of amplitude, when being on duty less than threshold value th, select identically with selection result m-1 in the past, decision is as the selection m of the selection result in present (the m moment).

By such formation, in the terminal C of the conversation of monitoring caller A and caller B, even under the situation that caller A and caller B pronounce simultaneously, because the pronunciation that has obtained considering the caller that the sound of this leading dialogue constantly is bigger is as output sound C, therefore, on to the assurance of dialog context, can not cause obstacle.

And, under the sound of caller A and caller B size difference is not enough big situation, the continuity that keeps selection result, therefore, just can avoid in terminal C because of at short notice continually the pronunciation of handoff calls person A and caller B in the assurance of the content of pronouncing, cause obstacle.

And in Fig. 2, the threshold value th of difference of vibration can be the value of fixing, and also can be the threshold value etc. of amplitude, the selection result in past and amplitude with sound sign indicating number and decoded voice and the value that suitably changes.

Choice device 32 comes diverter switch according to the information of being imported from above-mentioned control device 31, and selected sound sign indicating number is exported to modulating device 18 as sound sign indicating number A '.And 18 couples of sound sign indicating number A ' that imported from switching device shifter 30 of modulating device carry out digital modulation, and resulting modulation signal is exported to circuit A 10 as modulation signal A.

And, in the above-described embodiments, use method shown in Figure 2 choice criteria as the sound sign indicating number in the control device 31 in the switching device shifter 30, still, also can be the choice criteria of for example using other according to Fig. 3 and flow process shown in Figure 4 etc.And, can use these choice criteria by switching adaptably with these choice criteria from the indication of outside.

Fig. 3 represents: by the amplitude of the selected caller's of selection m-1 of the selection result of (m-1 constantly) decoded voice as in the past less than threshold value th, and, less than under the situation not by the caller's who selects the selected the opposing party of m-1 amplitude, select not by selecting the selected caller of m-1, under situation in addition, selection is identical with selection result m-1 in the past, decides the selection result of as now (m constantly).

Fig. 4 represents: under the situation of amplitude greater than threshold value th that does not have by the selected caller's of selection m-1 of the selection result of (m-1 constantly) the decoded voice as in the past, select not by selecting the selected caller of m-1, under situation in addition, selection is identical with selection result m-1 in the past, decides the selection result of as now (m constantly).

And in the above-described embodiments, when the sound sign indicating number in the present frame of selection, the selection result of the frame before only using still, also can be used the selection result in its frame in the past as the selection result in past.

And even under the different situation of the formation of system, the formation of this switching device shifter 30 can be intact, and the formation of other devices in the change terminal is used.

According to this embodiment 1, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in such sound sign indicating number changing method, control the selection of present frame according to the selection result in past, therefore, has the successional effect that can keep selection result.

When the sound sign indicating number changing method of this embodiment 1 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, the conversation that has caused having suppressed to take place continually sign indicating number to switch or monitor obstacle in, can avoid coding caused big quality badness by twice coding and dual conversation sound.

Embodiment 2

Fig. 5 represents to use the formation of terminal A of the sound sign indicating number changing method of embodiments of the invention 2.And, use the terminal A of this terminal A as Figure 23, become the formation of the sound communication system of the sound sign indicating number changing method that uses this embodiment 2.

In the drawings, the 30th, switching device shifter, the 33, the 35th, storage device, the 34, the 36th, deferred mount, the 31st, control device, the 32nd, choice device.Among this embodiment 2, switching device shifter 30 is different with embodiment 1 shown in Figure 1, and other parts are identical, therefore, uses same numeral and omits its explanation.

Action is described below with reference to the accompanying drawings.

Import the sound of caller A pronunciation as sound import A to terminal A.And, by circuit B from terminal B input modulating signal B.In demodulating equipment 12 each frame at the fixed time above-mentioned modulation signal B is carried out demodulation, resulting sound sign indicating number B is exported to storage device 35 and deferred mount 36 in sound decoding device 13 and the switching device shifter 30.13 pairs of tut sign indicating numbers of sound decoding device B decodes, and resulting digital output sound A is exported to D-A converting means 14.14 couples of above-mentioned digital output sound A of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound A of analog signal.

On the other hand, the sound import A of 16 couples of above-mentioned caller A of A-D converting means carries out analog-to-digital conversion (A-D conversion), and obtains the digital output sound A as digital signal, and A exports to sound coder 17 this numeral output sound.Above-mentioned digital output sound A is encoded in sound coder 17 each frame at the fixed time, resulting sound sign indicating number A is exported to switching device shifter 30 interior storage device 33 and deferred mount 34.

The sound sign indicating number A that 33 storage past of storage device N frame in the switching device shifter 30 is imported exports to control device 31 to the sound sign indicating number of this past N frame.And the sound sign indicating number B that 35 storage past of storage device N frame is imported exports to control device 31 to the sound sign indicating number of this past N frame.Control device 31 is according to the sound sign indicating number A of the N frame of being imported and the sound sign indicating number B of N frame, selects sound sign indicating number A before the N frame and the side in the sound sign indicating number B before the N frame according to predetermined selection criteria, exporting to choice device 32 with which the relevant information of selection.

An example as choice criteria, has such method: to sound sign indicating number A and actual decoding of sound sign indicating number B, analyze resulting decoded voice, each frame is judged it is that sound also is non-sound, according to this result of determination, select according to flow process shown in Figure 6.In Fig. 6, at first the sound of the decoded voice of the sound sign indicating number A before the N frame/non-sound result of determination as state A, the sound of the decoded voice of the sound sign indicating number B before the N frame/non-sound result of determination as state B.

And, from between the sound zones in the decoded voice of the sound sign indicating number A before the N frame or the continuous frame number between non-sound zones as persistence length A, between the sound zones in the decoded voice of the sound sign indicating number B before the N frame or the continuous frame number between non-sound zones as persistence length B.And, when a side is non-sound for sound the opposing party among state A and the state B, selection is a side's of sound a sound sign indicating number, and, when state A and state B two sides are sound, compare persistence length A and persistence length B, select a persistence length long side's the sound sign indicating number between its sound zones, and, when two sides are non-sound, relatively persistence length A and persistence length B select a persistence length short side's the sound sign indicating number between non-sound zones.

By such formation, in the terminal C of the conversation of monitoring caller A and caller B, even under the situation that caller A and caller B pronounce simultaneously, since the pronunciation sound length that has obtained considering this leading dialogue constantly long caller's pronunciation as output sound C, therefore, on to the assurance of dialog context, can not cause obstacle.

And, select the scheme of the tone period length of caller A and caller B than long caller's pronunciation, the continuity that has kept selection result, therefore, just can avoid in terminal C because of at short notice continually the pronunciation of handoff calls person A and caller B in the assurance of pronunciation content, cause obstacle.

Deferred mount 34 postpones the N frame to the sound sign indicating number A that is imported from tut code device 17, and the sound sign indicating number A before the N frame is exported to choice device 32.And deferred mount 36 postpones the N frame to the sound sign indicating number B that is imported from above-mentioned demodulating equipment 12, and the sound sign indicating number B before the N frame is exported to choice device 32.Choice device 32 comes diverter switch according to the information of being imported from above-mentioned control device 31, and selected sound sign indicating number is exported to modulating device 18 as sound sign indicating number A '.And 18 couples of sound sign indicating number A ' that imported from switching device shifter 30 of modulating device carry out digital modulation, and resulting modulation signal is exported to circuit A as modulation signal A.

And, in the above-described embodiments, analyze decoded voice in the control device 31 in switching device shifter 30, carry out sound/non-sound and judge that still, also the parameter that can comprise directly determines sound/non-sound from the sound sign indicating number.

And, in the above-described embodiments, in the choice criteria that sign indicating number switches, only used sound/non-sound result of determination, still, also can be used for selection reference to the selection result in the amplitude of decoded voice, past etc. and other information.

And, can there be choice device 32, deferred mount 34,36, control device 31 is selected the sound sign indicating number of the side before the N frame, exports this sound sign indicating number, thereby has omitted the memory that is used to postpone.

According to this embodiment 2, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, press N frame stored sound sign indicating number A and sound sign indicating number B, sound sign indicating number A and sound sign indicating number B according to the N frame of this storage, select a preceding sound sign indicating number A of N frame or the side of sound sign indicating number B to export, therefore, can positively select the caller's of leading conversation sign indicating number, and, can keep the continuity of selection result.

When the sound sign indicating number changing method of this embodiment 2 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, can not lose the caller's of leading conversation pronunciation content, and, when having suppressed the frequent generation that sign indicating number switches, can avoid coding caused big quality badness by twice coding and dual conversation sound.

Embodiment 3

Fig. 7 represents to use the formation of terminal A of the sound sign indicating number changing method of embodiments of the invention 3.And, use the terminal A of this terminal A as Figure 23, become the formation of the sound communication system that uses sound sign indicating number changing method of the present invention.

In the drawings, the 30th, switching device shifter, the 31st, control device, the 32nd, choice device, the 40th, storage device, 41 is second choice devices.Among this embodiment 3, switching device shifter 30 is different with embodiment 1 shown in Figure 1, and other parts are identical, therefore, uses same numeral and omits its explanation.

Action is described below with reference to the accompanying drawings.

Import the sound of caller A pronunciation as sound import A to terminal A.And, by circuit B from terminal B input modulating signal B.In demodulating equipment 12 each frame at the fixed time above-mentioned modulation signal B is carried out demodulation, resulting sound sign indicating number B is exported to control device 31 and second choice device 41 and choice device 32 in sound decoding device 13 and the switching device shifter 30.13 pairs of tut sign indicating numbers of sound decoding device B decodes, and resulting digital output sound A is exported to D-A converting means 14.14 couples of above-mentioned digital output sound A of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound A of analog signal.

On the other hand, 16 couples of above-mentioned sound import A of A-D converting means carry out analog-to-digital conversion (A-D conversion), and obtain the digital output sound A as digital signal, and A exports to sound coder 17 this numeral output sound.Above-mentioned digital output sound A is encoded in sound coder 17 each frame at the fixed time, resulting sound sign indicating number A is exported to switching device shifter 30 interior control device 31 and the choice device 32 and second choice device 41.

Control device 31 in the switching device shifter 30, according to predetermined selection criteria, memory state according to the sound sign indicating number A that is for example imported and sound sign indicating number B and past decision by the storage device 40 that can hold the selection result of second choice device 41, come a selection information relevant to export to second choice device 41 with the sign indicating number of storage in storage device 40, and, the selection information relevant with the sign indicating number of exporting to modulating device 18 is exported to choice device 32.

An example as choice criteria, has such method: to sound sign indicating number A and actual decoding of sound sign indicating number B, analyze resulting decoded voice, each frame is judged it is that sound also is non-sound, according to the memory state and the selection result in the past of this result of determination and the sound sign indicating number in storage device 40, select according to the table of Fig. 8.

In Fig. 8, at first the sound of the decoded voice of sound sign indicating number A/non-sound result of determination as state A, the sound of the decoded voice of sound sign indicating number B/non-sound result of determination as state B.And, the memory state of the sound sign indicating number in the storage device 40 as situation M.And the selection result in the past in the choice device 32 of (m-1 is constantly) is as selecting 32m-1, and the selection result now in the choice device 32 of (m is constantly) is as selecting 32m, the selection result in second choice device 41 as selection 41.

And, in state A, state B and situation M, have under the situation of sound or sign indicating number at any, select its sound sign indicating number to export.And under the situation that has sound or sign indicating number more than two, the preferential sound sign indicating number of output now of selecting is exported, and a not side's of output the sound sign indicating number among sound sign indicating number A, the sound sign indicating number B is stored in the storage device 40.

By such formation, even under the situation that caller A and caller B pronounce simultaneously, before a side caller's pronunciation finishes, storage the opposing party's caller's pronunciation waits for that a side caller's pronunciation finishes the pronunciation of exporting the opposing party's who is stored caller, therefore, in the terminal C of the conversation of monitoring caller A and caller B, can not lose both dialog contexts, on to the assurance of dialog context, can not cause obstacle.

Second choice device 41 comes diverter switch according to the information of being imported from above-mentioned control device 31, and selected sound sign indicating number is exported to storage device 40.Storage device 40 is storage buffers of FIFO type for example, and the sound sign indicating number series that storage is imported from above-mentioned second choice device 41 is exported to choice device 32 successively to this sound sign indicating number series.

And choice device 32 comes diverter switch according to the information of being imported from above-mentioned control device 31, and selected sound sign indicating number is exported to modulating device 18 as sound sign indicating number A '.And 18 couples of sound sign indicating number A ' that imported from switching device shifter 30 of modulating device carry out digital modulation, and resulting modulation signal is exported to circuit A as modulation signal A.

And, in the above-described embodiments, in the choice criteria that sign indicating number switches, used sound/non-sound result of determination, still, also can be used for selection reference to other information such as amplitude of decoded voice.

And in the above-described embodiments, the method shown in the table of use Fig. 8 still, also can be used other selection reference as the selection reference of the sign indicating number in the control device 31 in the switching device shifter 30.And, can suitably or by switching use a plurality of selection references from the indication of outside.

According to this embodiment 3, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, when the selection output that is judged to be sound sign indicating number A and sound sign indicating number B two sides all needs, a nonoptional side's sound sign indicating number in the frame before being stored in successively, the output of the sound sign indicating number of selecting in preceding frame becomes after the unwanted frame, export the sound sign indicating number series of storage before this in chronological order successively, therefore, has the effect that necessary sound sign indicating number can not be lost.

When the sound sign indicating number changing method of this embodiment 3 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, dialog context can not lost, and can avoid the caused big quality badness of coding by twice coding and the sound of talking incoherently.

And, when the sound sign indicating number of output storage is serial successively in chronological order, the sound sign indicating number of present frame is configured in the end of this sound sign indicating number series, the sound sign indicating number series of storing when being judged to be is between non-sound zones the time, ends the storage of this interval sound sign indicating number, therefore, do not need to store and non-sound zones that dialog context is irrelevant between, can reduce the sign indicating number storage in needed memory capacity, therefore, have the effect that can reduce unit scale.

Embodiment 4

Fig. 9 represents to use the formation of terminal A of the sound sign indicating number changing method of embodiments of the invention 4.And, use the terminal A of this terminal A as Figure 23, become the formation of the sound communication system that uses sound sign indicating number changing method of the present invention.

In the drawings, the 30th, switching device shifter, the 31st, control device, the 32nd, choice device, the 40th, storage device, 42 is second storage devices.Among this embodiment 4, switching device shifter 30 is different with embodiment 1 shown in Figure 1, and other parts are identical, therefore, uses same numeral and omits its explanation.

Action is described below with reference to the accompanying drawings.

Import the sound of caller A pronunciation as sound import A to terminal A.And, by circuit B from terminal B input modulating signal B.In demodulating equipment 12 each frame at the fixed time above-mentioned modulation signal B is carried out demodulation, resulting sound sign indicating number B is exported to control device 31, storage device 42 and choice device 32 in the sound decoding device 13, switching device shifter 30.13 pairs of tut sign indicating numbers of sound decoding device B decodes, and resulting digital output sound A is exported to D-A converting means 14.14 couples of above-mentioned digital output sound A of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound A of analog signal.

16 couples of above-mentioned sound import A of A-D converting means carry out analog-to-digital conversion (A-D conversion), and obtain the digital output sound A as digital signal, and A exports to sound coder 17 this numeral output sound.Above-mentioned digital output sound A is encoded in sound coder 17 each frame at the fixed time, resulting sound sign indicating number A is exported to switching device shifter 30 interior control device 31 and storage device 40 and choice device 32.

Control device 31 in the switching device shifter 30, according to predetermined selection criteria, memory state according to the sound sign indicating number that determines in the past in the sound sign indicating number A that is for example imported and sound sign indicating number B and storage device 40 and the storage device 42, come the information of the stored sound sign indicating number A how to export to storage device 40, how the information of stored sound sign indicating number B is exported to storage device 42, with export to choice device 32 to the relevant selection information of the sign indicating number of modulating device 18 outputs.

An example as choice criteria, has such method: to sound sign indicating number A and actual decoding of sound sign indicating number B, analyze resulting decoded voice, each frame is judged it is that sound also is non-sound, according to the memory state and the selection result in the past of this result of determination and the sound sign indicating number in storage device 40, storage device 42, select according to the table of Figure 10.In Figure 10, at first the sound of the decoded voice of sound sign indicating number A/non-sound result of determination as state A, the sound of the decoded voice of sound sign indicating number B/non-sound result of determination as state B.And, the memory state in the storage device 40 as situation MA, the memory state in the storage device 42 as situation MB.And the selection result in the past in the choice device 32 of (m-1 constantly) is as selecting m-1, and the selection result now in the choice device 32 of (m constantly) is as selecting m.

And, in state A, state B, situation MA and situation MB, have under the situation of sound or sign indicating number at any, select its sound sign indicating number to export.And under the situation that has sound or sign indicating number more than two, the preferential sound sign indicating number of output now of selecting is exported, and a not side's of output the sound sign indicating number among sound sign indicating number A, the sound sign indicating number B is stored in storage device 40 or the storage device 42.By such formation, even under the situation that caller A and caller B pronounce simultaneously, before a side caller's pronunciation finishes, storage the opposing party's caller's pronunciation, the pronunciation of waiting for a side caller finishes the pronunciation of exporting the opposing party's who is stored caller.

And, not in a storage device, to switch sound sign indicating number A and sound sign indicating number B stores, but two storage devices that sound sign indicating number A uses and sound sign indicating number B uses are set, thus, in the caller's that output is stored pronunciation, even under the situation that caller A and caller B pronounce simultaneously, can store two callers' sound sign indicating number simultaneously, therefore, in the terminal C of the conversation of monitoring caller A and caller B, can not lose both dialog contexts, on to the assurance of dialog context, can not cause obstacle.

Storage device 40 is storage buffers of FIFO type for example, according to the information of how storing the sound sign indicating number A that is imported from above-mentioned control device 31, store the sound sign indicating number series of being imported from sound coder 17, this sound sign indicating number series is exported to choice device 32 in chronological order successively.And, storage device 42 is storage buffers of FIFO type for example, according to the information of how storing the sound sign indicating number B that is imported from above-mentioned control device 31, store the sound sign indicating number series of being imported from demodulating equipment 12, this sound sign indicating number series is exported to choice device 32 in chronological order successively.

Choice device 32 comes diverter switch according to the information of being imported from above-mentioned control device 31, and selected sound sign indicating number A or B are exported to modulating device 18 as sound sign indicating number A '.And 18 couples of sound sign indicating number A ' that imported from switching device shifter 30 of modulating device carry out digital modulation, and resulting modulation signal is exported to circuit A as modulation signal A.

And, in the above-described embodiments, use by the method for the table of having represented its part among Figure 10 selection reference as the sign indicating number in the control device 31 in the switching device shifter 30, still, also can use other selection reference.And, can suitably or by switching use a plurality of selection references from the indication of outside.

According to this embodiment 4, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, when the selection output that is judged to be sound sign indicating number A and sound sign indicating number B two sides all needs, a nonoptional side's sound sign indicating number in the frame before being stored in successively, the output of the sound sign indicating number of selecting in preceding frame becomes after the unwanted frame, export the sound sign indicating number series of storage before this in chronological order successively, therefore, has the effect that necessary sound sign indicating number can not be lost.

And, owing to be provided with the device of difference stored sound sign indicating number A and sound sign indicating number B, therefore, when the sound sign indicating number changing method of this embodiment 4 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, even in the sound sign indicating number series of output storage, caller A, caller B pronounce simultaneously, dialog context can not lost, and can avoid the caused big quality badness of coding by twice coding and dual conversation sound.

Embodiment 5

Figure 11 represents to use the formation of terminal A of the sound sign indicating number changing method of embodiments of the invention 5.And, use the terminal A of this terminal A as Figure 23, become the formation of the sound communication system that uses sound sign indicating number changing method of the present invention.

In the drawings, the 30th, switching device shifter, the 31st, control device, the 32nd, choice device, the 40th, storage device, 42 is second storage devices, the 43rd, change sign indicating number generating apparatus.Among this embodiment 5, switching device shifter 30 is different with embodiment 1 shown in Figure 1, and other parts are identical, therefore, uses same numeral and omits its explanation.

Action is described below with reference to the accompanying drawings.

An example as choice criteria, has such method: to sound sign indicating number A and actual decoding of sound sign indicating number B, analyze resulting decoded voice, each frame is judged it is that sound also is non-sound, according to the memory state and the selection result in the past of this result of determination and the sound sign indicating number in storage device 40, storage device 42, select according to the table of its part of expression among Figure 12.

In Figure 12, at first the sound of the decoded voice of sound sign indicating number A/non-sound result of determination as state A, the sound of the decoded voice of sound sign indicating number B/non-sound result of determination as state B.And, the memory state in the storage device 40 as situation MA, the memory state in the storage device 42 as situation MB.And the selection result in the past in the choice device 32 of (m-2 constantly) is as selecting m-2, and the selection result in the past in the choice device 32 of (m-1 constantly) is as selecting m-1, and the selection result now in the choice device 32 of (m constantly) is as selecting m.

When as sound sign indicating number A ' and the sign indicating number of output from sound sign indicating number A or the sign indicating number storage device 40, stored by when sign indicating number that is changed to sound sign indicating number B or in storage device 42, stored, perhaps, otherwise, when when sign indicating number that changes to sound sign indicating number A or in storage device 40, stored from sound sign indicating number B or the sign indicating number storage device 42, stored, select the sign indicating number of this change that expression exported from change sign indicating number generating apparatus 43, and output.

By such formation, in the terminal C of the conversation of monitoring caller A and caller B, can the identification code switching point, therefore, can discover discontinuity in advance, and special the processing such as relax, and can improve communication quality at the contingent output sound C of this yard switching instant.

Storage device 40 is storage buffers of FIFO type for example, according to the information of how storing the sound sign indicating number A that is imported from above-mentioned control device 31, store the sound sign indicating number series of being imported from sound coder 17, this sound sign indicating number series is exported to choice device 32 in chronological order successively.

And, storage device 42 is storage buffers of FIFO type for example, according to the information of how storing the sound sign indicating number B that is imported from above-mentioned control device 31, store the sound sign indicating number series of being imported from demodulating equipment 12, this sound sign indicating number series is exported to choice device 32 in chronological order successively.

And the special sign indicating number C that change sign indicating number generating apparatus 43 generates the switching of expression sound sign indicating number exports to choice device 32.Choice device 32 comes diverter switch according to the information of being imported from above-mentioned control device 31, and selected sound sign indicating number is exported to modulating device 18 as sound sign indicating number A '.And 18 couples of sound sign indicating number A ' that imported from switching device shifter 30 of modulating device carry out digital modulation, and resulting modulation signal is exported to circuit A as modulation signal A.

And, in the above-described embodiments, use by the method for the table of having represented its part among Figure 12 selection reference as the sign indicating number in the control device 31 in the switching device shifter 30, still, also can use other selection reference.And, can suitably or by switching use a plurality of selection references from the indication of outside.

And in the above-described embodiments, the sign indicating number of being exported from change sign indicating number generating apparatus 43 can be single, can use a plurality of sign indicating numbers, so that make expression inequality to the sign indicating number of the change of sound sign indicating number A from sound sign indicating number B with expression to the sign indicating number of the change of sound sign indicating number B from sound sign indicating number A.

According to this embodiment 5, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, in the frame that the selection of sound sign indicating number A and sound sign indicating number B changes, the sound sign indicating number of the information of change as this frame selected in the output expression, this is selected after the information output of change in expression, the output successively of the sound sign indicating number series of storing, therefore, can be from the sound sign indicating number series the exported switching instant of sound recognition sign indicating number A and sound sign indicating number B correctly.

When the sound sign indicating number changing method of this embodiment 5 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, can discern the discontinuous contingent sign indicating number switching instant that output is used, therefore, can eliminate this discontinuous special processing, and improve communication quality.

Embodiment 6

Figure 13 represents to use the formation of the terminal A of sound sign indicating number changing method of the present invention.And, use the terminal A of this terminal A as Figure 23, become the formation of the sound communication system that uses sound sign indicating number changing method of the present invention.

In the drawings, the 30th, switching device shifter, the 31st, control device, the 32nd, choice device.Among this embodiment 6, the formation of the control device 31 in the switching device shifter 30 is promptly different as the point of the outside input E of the indication relevant with the preferential selection of sound sign indicating number and embodiment 1 shown in Figure 1 to control device 31 inputs, other parts are identical, therefore, use same numeral and omit its explanation.

Action is described below with reference to the accompanying drawings.

Import the sound of caller A pronunciation as sound import A to terminal A.And, by circuit B from terminal B input modulating signal B.And by above-mentioned such, input is as the outside input E of the indication relevant with the preferential selection of sound sign indicating number.In demodulating equipment 12 each frame at the fixed time above-mentioned modulation signal B is carried out demodulation, resulting sound sign indicating number B is exported to control device 31 and choice device 32 in the sound decoding device 13, switching device shifter 30.13 pairs of tut sign indicating numbers of sound decoding device B decodes, and resulting digital output sound A is exported to D-A converting means 14.14 couples of above-mentioned digital output sound A of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound A of analog signal.

16 couples of above-mentioned sound import A of A-D converting means carry out analog-to-digital conversion (A-D conversion), and obtain the digital output sound A as digital signal.Above-mentioned digital output sound A is encoded in sound coder 17 each frame at the fixed time, resulting sound sign indicating number A is exported to switching device shifter 30 interior control device 31 and choice device 32.Control device 31, according to said external input E and predetermined selection criteria, sound sign indicating number A that selection is imported and the side in the sound sign indicating number B are exporting to choice device 32 with the relevant information which has been selected.

An example as choice criteria, have such method: according to from the indication of outside input E and to the amplitude A of the actual decoded voice that obtains of decoding of sound sign indicating number A and sound sign indicating number B and amplitude B and as in the past the selection m-1 of the selection result of (m-1 constantly), select according to flow process shown in Figure 14.Figure 14 is: under the situation that has the indication of importing E from the outside, select indicated sound sign indicating number, under the situation of the indication of not importing E from the outside, when the difference of vibration of two decoded voices during greater than threshold value th, select the big side of amplitude, when being on duty less than threshold value th, selection is identical with selection result m-1 in the past, decides the selection m of the selection result of (m constantly) as now.

By such formation, for the terminal C of the conversation of monitoring caller A and caller B,, also can preferentially send the content of notice even under the situation that caller A and caller B pronounce simultaneously, therefore, can positively indicate and contact etc.

Choice device 32 comes diverter switch according to the information of being imported from above-mentioned control device 31, and selected sound sign indicating number is exported to modulating device 18 as sound sign indicating number A '.And 18 couples of sound sign indicating number A ' that imported from switching device shifter 30 of modulating device carry out digital modulation, and resulting modulation signal is exported to circuit A as modulation signal A.

And, in the above-described embodiments, use by method shown in Figure 14 selection reference as the sign indicating number in the control device 31 in the switching device shifter 30, still, also can use other selection reference.And, can suitably or by switching use a plurality of selection references from the indication of outside.

And, in the above-described embodiments, serve as that predetermined input is accepted on the basis from the outside with embodiment 1, be scheduled to the sound sign indicating number that a side is preferentially selected in input according to this, still, also can be formation based on other embodiment.

According to this embodiment 6, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, when the predetermined input accepted from the outside, preferentially select a side sound sign indicating number according to this predetermined input, therefore, has the effect that positively to send desirable sound sign indicating number.

When the sound sign indicating number changing method of this embodiment 6 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, can preferentially send the content of notice, can positively indicate and the effect of contact etc. and have.

Embodiment 7

The formation of the terminal A of the use sound sign indicating number changing method of this embodiment 7 is identical with embodiment 1 shown in Figure 1.Figure 15 is illustrated in the selection reference of employed sign indicating number in the control device 31 in the switching device shifter 30 of the terminal A in the sound sign indicating number changing method of embodiments of the invention 7.

In Figure 15, the amplitude and the selection result in the past of the decoded voice that obtains according to sound sign indicating number A and sound sign indicating number B are decoded, when the amplitude of the decoded voice of sound sign indicating number A during greater than certain threshold value TH, a yard A preferentially selects a sound.In addition, select according to the benchmark identical with the foregoing description 1.By such formation, for the caller B of caller A conversation and the people who monitors with other terminal, can preferentially send the pronunciation content of caller A, therefore, can positively indicate and contact etc.

And, in the above-described embodiments, can use formation with different selection reference shown in Figure 15.And, can suitably or by switching use a plurality of selection references from the indication of outside.

And, in the above-described embodiments,, have with sound sign indicating number B irrelevantly based on embodiment 1, when sound sign indicating number A satisfied predetermined condition, the exceptional condition of preferentially selecting still, also can be the formation based on other embodiment.

According to this embodiment 7, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, have with sound sign indicating number B irrelevant, when sound sign indicating number A satisfies predetermined condition, the exceptional condition of preferentially selecting, therefore, has the effect that positively to send sound sign indicating number A.

When the sound sign indicating number changing method of this embodiment 7 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, between the caller, can not lose dialog context, can positively indicate and the effect of contact etc. and have.

Embodiment 8

Figure 16 represents to use the formation of terminal A of the sound sign indicating number changing method of embodiments of the invention 8.This embodiment 8 is the schemes of having added correction process on the foregoing description 1.And, use the terminal A of this terminal A as Figure 23, become the formation of the sound communication system that uses sound sign indicating number changing method of the present invention.

In the drawings, the 45th, on information code A, added error correcting code A and as the encoder for correcting of sound sign indicating number A output from sound coder 17, the 46th, the error correction decoding device that the error correcting code B from the sound sign indicating number B of demodulating equipment 12 is decoded, the 30th, switching device shifter, the 31st, control device, the 32nd, choice device.The 47th, the error correction decoding device in the above-mentioned switching device shifter 30,48 is the encoder for correcting in the above-mentioned switching device shifter 30 equally.

And the label identical with Fig. 1 represented identical or considerable part, therefore, omits its explanation.

Action is described below with reference to the accompanying drawings.

Import the sound of caller A pronunciation as sound import A to terminal A.And, by circuit B from terminal B input modulating signal B.In demodulating equipment 12 each frame at the fixed time above-mentioned modulation signal B is carried out demodulation, resulting sound sign indicating number B is exported to error correction decoding device 47 in error correction decoding device 46 and the switching device shifter 30.

Tut sign indicating number B is made of information code B and its error correcting code B of expression acoustic information.46 pairs of tut sign indicating numbers of error correction decoding device B carries out error correction, and resulting information code B is exported to sound decoding device 13.

13 pairs of tut sign indicating numbers of sound decoding device B decodes, and resulting digital output sound A is exported to D-A converting means 14.14 couples of above-mentioned digital output sound A of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound A of analog signal.

16 couples of above-mentioned sound import A of A-D converting means carry out analog-to-digital conversion (A-D conversion), and obtain the digital output sound A as digital signal.In sound coder 17 each frame at the fixed time above-mentioned digital output sound A is encoded, resulting sound sign indicating number A is exported to encoder for correcting 45.Encoder for correcting 45 is given the additional error correcting code A of above-mentioned information code A and as sound sign indicating number A, and this sound sign indicating number A is exported to control device 31 and choice device 32 in the switching device shifter 30.

The sound sign indicating number B that 47 pairs in error correction decoding device in the switching device shifter 30 is imported carries out error correction, and resulting information code B is exported to encoder for correcting 48.Encoder for correcting 48 is given the additional error correcting code B ' of above-mentioned information code B and as sound sign indicating number B ', B ' exports to control device 31 and choice device 32 this sound sign indicating number.By such formation, sound sign indicating number B ' has eliminated the influence of the error of transmission among the circuit B, therefore, when circuit A exports, only is subjected to the influence of the error of transmission of circuit A, can avoid the influence of the mistake of circuit B and two circuits of circuit A to produce accumulation.

Control device 31, according to predetermined selection criteria for example the benchmark shown in the embodiment 1 select a side in the sound sign indicating number A that imported and the sound sign indicating number B ', exporting to choice device 32 with the relevant information which has been selected.Choice device 32 comes diverter switch according to the information of being imported from above-mentioned control device 31, and selected sound sign indicating number is exported to modulating device 18 as sound sign indicating number A '.And 18 couples of sound sign indicating number A ' that imported from switching device shifter 30 of modulating device carry out digital modulation, and resulting modulation signal is exported to circuit A as modulation signal A.

In the above-described embodiments, based on embodiment 1, B carries out error correction decoding and error correction coding to the sound sign indicating number, still, also can be the formation based on other embodiment.

And in the above-described embodiments, encoder for correcting 45 is identical with the action of encoder for correcting 48, therefore, as shown in Figure 17, by the position of mobile encoder for correcting 45 between switching device shifter 30 and modulating device 18, also can be the formation that does not have encoder for correcting 48.

And in the above-described embodiments, error correction decoding device 46 is identical with the action of encoder for correcting 47, therefore, as shown in Figure 18, by the position of mobile error correction decoding device 46 between switching device shifter 30 and demodulating equipment 12, also can be the formation that does not have error correction decoding device 47.

According to this embodiment 8, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, each sound sign indicating number is made of information code and its error correcting code of expression acoustic information, B carries out error correction decoding and error correction coding to the sound sign indicating number, therefore, has the sound sign indicating number that to export the influence that is not subjected to error of transmission.

When the sound sign indicating number changing method of this embodiment 8 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, for sound sign indicating number B by many circuits, can avoid the error of transmission of every circuit to produce accumulation, and have the effect that can realize high-quality conversation.

Embodiment 9

Figure 19 represents to use the formation of terminal A of the sound sign indicating number changing method of embodiments of the invention 9.Figure 20 represents to use the formation of the sound communication system of this terminal A.In Figure 19, the 30th, switching device shifter, the 31st, control device, the 50, the 51st, yard withdrawing device, the 52nd, code combination device, the 32nd, choice device.Among the terminal A of this embodiment 9, switching device shifter 30 is different with embodiment 1 shown in Figure 1, and other parts are identical, therefore, uses same numeral and omits its explanation.

In Figure 20, the 53, the 54th, separator, the 55th, sound decoding device, the 56th, adder.And the label identical with Figure 23 represented identical or suitable part, and omits its explanation.

Action is described below with reference to the accompanying drawings.

Import the sound of caller A pronunciation as sound import A to terminal A.And, by circuit B from terminal B input modulating signal B.In demodulating equipment 12 each frame at the fixed time above-mentioned modulation signal B is carried out demodulation, resulting sound sign indicating number B is exported to control device 31, sign indicating number withdrawing device 51 and choice device 32 in the sound decoding device 13, switching device shifter 30.Wherein, sound sign indicating number B is by the scalable code structure dimerous two sections of sound sign indicating number B0 and sound sign indicating number B1, takes such code structure: even only use sound sign indicating number B0 also can decode quality variation but the sound that can understand slightly.

16 couples of above-mentioned sound import A of A-D converting means carry out analog-to-digital conversion (A-D conversion), and obtain the digital output sound A as digital signal.17 couples of above-mentioned digital output sound A of sound coder encode, and resulting sound sign indicating number A is exported to control device 31, sign indicating number withdrawing device 50 and choice device 32 in the switching device shifter 30.Wherein, sound sign indicating number A is by the scalable code structure dimerous two sections of sound sign indicating number A0 and sound sign indicating number A1, takes such code structure: even only use sound sign indicating number A0 also can decode quality variation but the sound that can understand slightly.

Sign indicating number withdrawing device 50 in the switching device shifter 30 is extracted sound sign indicating number A0 out from the sound sign indicating number A that is imported, and exports to code combination device 52.And the sign indicating number withdrawing device 51 in the switching device shifter 30 is extracted sound sign indicating number B0 out from the sound sign indicating number B that is imported, and exports to code combination device 52.Code combination device 52 generates sound sign indicating number A0 that is imported and the combined sign indicating number of sound sign indicating number B0, exports to choice device 32.Control device 31 is selected any in the combination of the sound sign indicating number A that imported and sound sign indicating number B and sound sign indicating number A0 and sound sign indicating number B0 according to the preset selection benchmark, exporting to choice device 32 with the relevant information which has been selected.

The action of the sound communication system that uses this terminal A is described according to Figure 20 below.

Import the sound of caller B pronunciation as sound import B to terminal B.And, by circuit A from terminal A input modulating signal A.23 couples of above-mentioned sound import B of A-D converting means carry out analog-to-digital conversion (A-D conversion), and obtain the sound import B as digital signal.24 couples of above-mentioned digital sound import B of sound coder encode, and resulting sound sign indicating number B is exported to modulating device 25.The sound sign indicating number B that 25 pairs of modulating devices are imported carries out digital modulation, and resulting modulation signal is exported to circuit B as modulation signal B.

20 couples of modulation signal A from above-mentioned terminal A of modulating device in the terminal B carry out demodulation, and resulting sound sign indicating number A ' is exported to separator 53.Separator 53 is only isolated the corresponding sound sign indicating number with sound import A from tut sign indicating number A ', and exports to sound decoding device 21.That is, be under the situation of sound sign indicating number A at sound sign indicating number A ', sound sign indicating number A is: when sound sign indicating number A ' was the combination of sound sign indicating number A0 and sound sign indicating number B0, sound sign indicating number A0 was the input to sound decoding device 21.

21 pairs of sound sign indicating numbers of being imported from above-mentioned separator 53 of sound decoding device are decoded, and resulting digital output sound B is exported to D-A converting means 22.22 couples of above-mentioned digital output sound B of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound B of digital signal.

Pass through circuit A to terminal C input modulating signal A from terminal A.26 couples of above-mentioned modulation signal A of demodulating equipment carry out demodulation, and resulting sound sign indicating number A ' is exported to separator 54.Separator 54 tut sign indicating number A ' be separated into the corresponding sound sign indicating number of sound import A and with the corresponding sound sign indicating number of sound import B, exporting to sound decoding device 27, exporting to sound decoding device 55 with the corresponding sound sign indicating number of sound import B with the corresponding sound sign indicating number of sound import A.

Promptly, when sound sign indicating number A ' is sound sign indicating number A, sound sign indicating number A is the input to sound decoding device 27, when sound sign indicating number A ' is the combination of sound sign indicating number A0 and sound sign indicating number B0, sound sign indicating number A0 is the input to sound decoding device 27, sound sign indicating number B0 is the input to sound decoding device 55, and when sound sign indicating number A ' was sound sign indicating number B, sound sign indicating number B was the input to sound decoding device 55.

27 pairs of sound decoding devices are decoded with the corresponding sound sign indicating number of sound sign indicating number A from separator 54 is that imported, export resulting digital output sound CA.And 55 pairs of sound decoding devices are decoded with the corresponding sound sign indicating number of sound import B from above-mentioned separator 54 is that imported, export resulting digital output sound CB.D-A converting means 28 carries out digitaltoanalogconversion (D-A conversion) for the digital output sound C that above-mentioned digital output sound CA and digital output sound CB addition is obtained with adder 56, and output is as the output sound C of analog signal.

And, in the above-described embodiments, in switching device shifter based on embodiment 1, when the selection output that is judged to be telescopic sound sign indicating number A and sound sign indicating number B two sides when all being necessary, can export the sign indicating number that the part of two sound sign indicating numbers is made up, but, also can be formation based on other embodiment.

And in the above-described embodiments, making the sound sign indicating number is the formation of two sections scalable sign indicating number, still, also can be the formation of the scalable sign indicating number more than three sections.And, can set a plurality of sign indicating number part and combinations thereof of from the scalable sign indicating number of these sections, extracting out, switch them and export.

In the above-described embodiments, in terminal C, two digital output sounds are carried out addition, then, carry out the D-A conversion, still, also can become output sound to two analog signal additions respectively two digital output sounds being carried out the D-A conversion and obtain.And, can not that two analog signal additions are become a signal, but export individually respectively.

According to this embodiment 9, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, even the telescopic code structure of each sound sign indicating number for using its part also can decode to sound, the sign indicating number that each part of each sound sign indicating number is made up is as one of candidate of select exporting, therefore, even under the situation that caller A and caller B pronounce simultaneously, also has the effect that to export the sound sign indicating number that to decode to two callers' sound.

When the sound sign indicating number changing method of this embodiment 9 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, even under the situation that caller A and caller B pronounce simultaneously, can not increase amount of information and export the sound sign indicating number that to decode to two callers' sound, therefore, conversation can not lost, and can avoid the caused big quality badness of coding by twice coding and dual conversation sound.

Embodiment 10

Figure 21 represents to use the formation of the terminal A of sound sign indicating number changing method of the present invention.And, use the terminal A of this terminal A as Figure 23, become the formation of the sound communication system that uses sound sign indicating number changing method of the present invention.

This embodiment 10 is that the output of control device 31 is exported to choice device 32 and modulating device 18 with embodiment 1 difference shown in Figure 1.

Other parts are identical with Fig. 1, therefore omit its explanation.

Action is described below with reference to the accompanying drawings.

Import the sound of caller A pronunciation as sound import A to terminal A.And, by circuit B from terminal B input modulating signal B.In demodulating equipment 12 each frame at the fixed time above-mentioned modulation signal B is carried out demodulation, resulting sound sign indicating number B is exported to control device 31 and choice device 32 in the sound decoding device 13, switching device shifter 30.13 pairs of tut sign indicating numbers of sound decoding device B decodes, and resulting digital output sound A is exported to D-A converting means 14.14 couples of above-mentioned digital output sound A of D-A converting means carry out digitaltoanalogconversion (D-A conversion), and output is as the output sound A of analog signal.

16 couples of above-mentioned sound import A of A-D converting means carry out analog-to-digital conversion (A-D conversion), and obtain the digital output sound A as digital signal.Above-mentioned digital output sound A is encoded in sound coder 17 each frame at the fixed time, resulting sound sign indicating number A is exported to switching device shifter 30 interior control device 31 and choice device 32.Control device 31 is selected the sound sign indicating number A imported and the side among the sound sign indicating number B according to predetermined selection criteria, exporting to choice device 32 and modulating device 18 with the relevant information which has been selected.

And the selection reference of control device 31 is identical with the foregoing description 1.

Choice device 32 comes diverter switch according to the information of being imported from above-mentioned control device 31, and selected sound sign indicating number is exported to modulating device 18 as sound sign indicating number A '.And 18 pairs of modulating devices have added the sound sign indicating number A ' that is imported from switching device shifter 30 after by above-mentioned control device 31 selected identifying informations signal carries out digital modulation, and resulting modulation signal is exported to circuit A as modulation signal A.

By such formation, in the terminal C of the conversation of monitoring caller A and caller B, which caller the sound sign indicating number that can discern reception is, therefore, can carry out suitable processing to each caller, perhaps, can the identification code switching instant and discover the discontinuity of output sound C in advance, the special processing such as relax, and can improve communication quality.

And, in the above-described embodiments, based on embodiment 1, output can identification selection the information of which sign indicating number, still, also can be formation based on other embodiment.

According to this embodiment 10, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, output can identification selection the information of which sign indicating number, therefore, can correctly discern the sound sign indicating number series of being exported is sound sign indicating number A or sound sign indicating number B.

When the sound sign indicating number changing method of this embodiment 10 being used for share two circuits and can be enough during other the digitized sound communication system of conversation of two terminal rooms of terminal monitoring at a plurality of terminal rooms, which caller the sound sign indicating number that can discern reception is, therefore, can carry out suitable processing to each caller, perhaps, can the identification code switching instant and discover the discontinuity of output sound C in advance, the special processing such as relax, and have the effect that can improve communication quality.

According to the present invention, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in such sound sign indicating number changing method or device, the selection control of output frame is carried out according to the selection result in past, therefore, has the successional effect that can keep selection result.

And, according to the present invention, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, press N frame stored sound sign indicating number A and sound sign indicating number B, sound sign indicating number A and sound sign indicating number B according to the N frame of this storage, select a preceding sound sign indicating number A of N frame or the side of sound sign indicating number B to export, therefore, can positively select the caller's of leading conversation sign indicating number, and, can keep the continuity of selection result.

And, according to the present invention, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, when the selection output that is judged to be sound sign indicating number A and sound sign indicating number B two sides all needs, a nonoptional side's sound sign indicating number in the frame before being stored in successively, the output of the sound sign indicating number of selecting in preceding frame becomes after the unwanted frame, export the sound sign indicating number series of storage before this in chronological order successively, therefore, have the effect that necessary sound sign indicating number can not be lost.

And, according to the present invention, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, when the predetermined input accepted from the outside, preferentially select a side sound sign indicating number according to this predetermined input, therefore, has the effect that positively to send desirable sound sign indicating number.

And, according to the present invention, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, and in this sound sign indicating number changing method, has with sound sign indicating number B irrelevant, when sound sign indicating number A satisfies predetermined condition, therefore the exceptional condition of preferentially selecting, has the effect that can positively send sound sign indicating number A.

And, according to the present invention, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, each sound sign indicating number is made of information code and its error correcting code of expression acoustic information, B carries out error correction decoding and error correction coding to the sound sign indicating number, therefore, has the sound sign indicating number that to export the influence that is not subjected to error of transmission.

And, according to the present invention, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, even the telescopic code structure of each sound sign indicating number for using its part also can decode to sound, the sign indicating number that each part of each sound sign indicating number is made up is as one of candidate of select exporting, therefore, even under the situation that caller A and caller B pronounce simultaneously, also has the effect that to export the sound sign indicating number that to decode to two callers' sound.

And, according to the present invention, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with to the sound import that is produced by caller B is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, in this sound sign indicating number changing method, output can identification selection the information of which sign indicating number, therefore, can correctly discern the sound sign indicating number series of being exported is sound sign indicating number A or sound sign indicating number B.

The reference numeral explanation

Amplitude A: the amplitude of the decoded voice of sound code A

Amplitude B: the amplitude of the decoded voice of sound code B

Th: the threshold value of difference of vibration (＞0)

Select m-1:m-1 selection result constantly

Select m:m selection result constantly

Fig. 2

Amplitude A: the amplitude of the decoded voice of sound code A

Amplitude B: the amplitude of the decoded voice of sound code B

Th: the threshold value of amplitude (＞0)

Select m-1:m-1 selection result constantly

Select m:m selection result constantly

Fig. 3

Amplitude A: the amplitude of the decoded voice of sound code A

Amplitude B: the amplitude of the decoded voice of sound code B

Th: the threshold value of amplitude (＞0)

Select m-1:m-1 selection result constantly

Select m:m selection result constantly

Fig. 4

The sound of the decoded voice of the sound code A before the state A:N frame/non-sound result of determination

The sound of the decoded voice of the sound code B before the state B:N frame/non-sound result of determination

Persistence length A: continuous frame number between the sound zones the decoded voice of the sound A before the N frame or between non-sound zones

Persistence length B: continuous frame number between the sound zones the decoded voice of the sound B before the N frame or between non-sound zones

Selection-N: the selection result corresponding with the moment before the N frame

Fig. 6

State A: the sound of the decoded voice of sound sign indicating number A/non-sound result of determination (o: sound ,-: non-sound)

State B: the sound of the decoded voice of sound sign indicating number B/non-sound result of determination (o: sound ,-: non-sound)

Situation M: the memory state of the sound sign indicating number in the storage device 40 (o: sign indicating number is arranged ,-: do not have sign indicating number)

Select the selection result (A: sound sign indicating number A, B: sound sign indicating number B, M: the sound sign indicating number of storage device 40) in 32n: the n choice device 32 constantly

Selection result in selection 41n: n second choice device 41 constantly (A: sound sign indicating number A, B: sound sign indicating number B ,-: not storage)

Fig. 8

Situation MA: the memory state of the sound sign indicating number in the storage device 40 (o: sign indicating number is arranged ,-: do not have sign indicating number)

Situation MB: the memory state of the sound sign indicating number in the storage device 42 (o: sign indicating number is arranged ,-: do not have sign indicating number)

Store M A: to the storage indication of the sound sign indicating number A of storage device 40 (o: store ,-: do not store)

Store M B: to the storage indication of the sound sign indicating number B of storage device 42 (o: store ,-: do not store)

Figure 10

Selection result in the selection n:n choice device 32 constantly (A: sound sign indicating number A, B: sound sign indicating number B,

C: change sign indicating number, MA: the sound sign indicating number of storage device 40, MB: the sound sign indicating number of storage device 42, X: arbitrarily)

Figure 12

Amplitude A: the amplitude of the decoded voice of sound sign indicating number A

Amplitude B: the amplitude of the decoded voice of sound sign indicating number B

Th: the threshold value of difference of vibration (＞0)

Select m-1:m-1 selection result constantly

Select m:m selection result constantly

Figure 14

Th: the threshold value of difference of vibration (＞0)

Select m-1:m-1 selection result constantly

Select m:m selection result constantly

Figure 15

Claims

1. sound sign indicating number changing method, the sound sign indicating number B that encodes the sound sign indicating number A that the sound import that is produced by caller A is encoded with by the sound import that caller B is produced is as input, the side of yard A and sound sign indicating number B of selecting a sound in each frame at the fixed time exports, and it is characterized in that:

When sound sign indicating number A satisfies predetermined condition, preferentially select tut sign indicating number A.

2. sound sign indicating number changing method according to claim 1 is characterized in that:

When in former frame, having selected sound sign indicating number A, preferentially select tut sign indicating number A.

3. sound sign indicating number changing method according to claim 1 is characterized in that:

When the amplitude ratio threshold value of the decoded voice of sound sign indicating number A is big, preferentially select tut sign indicating number A.

4. sound sign indicating number changing method according to claim 1 is characterized in that:

When receiving the indication input of yard A that is used to select a sound from the outside, preferentially select tut sign indicating number A.