CN101964189A - Audio signal switching method and device - Google Patents
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Abstract
The invention provides an audio signal switching method and an audio signal switching device. The audio signal switching method comprises the following steps of: when an audio signal switches, performing weighted processing on a first high-frequency band signal of the audio signal of a current frame and second high-frequency band signals of the audio signals of first M frames so as to obtain a processed first high-frequency band signal, wherein M is greater than or equal to 1; and synthesizing the processed first high-frequency band signal and a first low-frequency band signal of the audio signal of the current frame into a broad band signal. By processing the first high-frequency band signal of the current frame according to the second high-frequency band signals of the audio signals of the first M frames, the second high-frequency band signals of the audio signals of the first M frames can transit to the processed first high-frequency band signal smoothly, so that the audio signals with different band widths can be switched smoothly and the quality of the audio signals received by a user is improved.
Description
Technical field
The embodiment of the invention relates to communication technical field, relates in particular to a kind of voice signal switching method and device frequently.
Background technology
At present, voice frequency signal is in the network state transmission course, because the difference of network state, network can to the voice that are transferred to network from coding side frequently the code stream of signal do blocking of different code checks, thereby the voice that decoding end will go out different bandwidth according to the code stream decoding after blocking signal frequently.
In the prior art, because the language audio signal bandwidth difference of transmitting in the network, in voice frequency signals transmission, exist narrow-band voice frequency signal to the signal switching frequently of broadband voice, and broadband voice frequency signal is to the phenomenon of narrow-band voice frequency signal switching.The narrow-band signal of mentioning among the present invention is for by up-sampling and low-pass filtering, switch to have only the low-frequency band composition and the high frequency band composition is empty broadband signal, and the broadband voice frequently the existing low band signal composition of signal the high-frequency band signals composition is arranged.
In realizing process of the present invention, the inventor finds that there are the following problems at least in the prior art: because narrow-band voice frequency signal and broadband voice differ the information in the high-frequency band signals frequently between the signal, when switching the voice frequency signal of different bandwidth, the phenomenon that the audio signal energies violent change can occur, thereby can cause the user acoustically to feel under the weather, cause the user to answer the degradation of sound signal.
Summary of the invention
The embodiment of the invention provides a kind of voice signal switching method and device frequently, realizes the signal switching frequently of the level and smooth voice that carry out different bandwidth, to improve the quality that the user answers sound signal.
The embodiment of the invention provides a kind of voice signal switching method frequently, comprising:
When voice when frequently switching appears in signal, with the present frame voice frequently first high-frequency band signals of signal and preceding M frame voice frequently second high-frequency band signals of signal be weighted processing, with first high-frequency band signals after obtaining handling; Wherein, M is more than or equal to 1;
The synthetic broadband signal of first low band signal with first high-frequency band signals after the described processing and described present frame voice frequency signal.
The embodiment of the invention provides a kind of sound signal switching device shifter, comprising:
Processing module is used for when voice when frequently switching appears in signal, with the present frame voice frequently first high-frequency band signals of signal and preceding M frame voice frequently second high-frequency band signals of signal be weighted processing, with first high-frequency band signals after obtaining handling; Wherein, M is more than or equal to 1;
First synthesis module is used for the synthetic broadband signal of first low band signal with first high-frequency band signals after the described processing and described present frame voice frequency signal.
The voice of the embodiment of the invention are signal switching method and device frequently, by according to the voice of preceding M frame frequently signal second high-frequency band signals to the present frame voice frequently first high-frequency band signals of signal handle, so that the voice of preceding M frame frequently second high-frequency band signals of signal can be smoothly transitted into first high-frequency band signals after the processing, and first high-frequency band signals after will handling and the synthetic broadband signal of first low band signal, thereby in switching the voice frequency signal process of different bandwidth, the voice that carry out different bandwidth that can be level and smooth signal frequently switch, reduced the energy violent change and caused the voice influence of the subjective acoustical quality difference of signal frequently, improved the user and answered voice quality of signals frequently.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do one to the accompanying drawing of required use in embodiment or the description of the Prior Art below introduces simply, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is voice frequency signal switching method embodiment one process flow diagram of the present invention;
Fig. 2 is voice frequency signal switching method embodiment two process flow diagrams of the present invention;
Fig. 3 is the process flow diagram of an embodiment of step 201 among Fig. 2;
Fig. 4 is the process flow diagram of an embodiment of step 302 among Fig. 3;
Fig. 5 is the flowchart 2 of another embodiment of step 302 among Fig. 3;
Fig. 6 is the process flow diagram of an embodiment of step 202 among Fig. 2;
Fig. 7 is the flowchart 2 of another embodiment of step 201 among Fig. 2;
Fig. 8 is the flow chart 3 of another embodiment of step 201 among Fig. 2;
Fig. 9 is the structural representation of voice frequency signal switching apparatus embodiment one of the present invention;
Figure 10 is the structural representation of voice frequency signal switching apparatus embodiment two of the present invention;
Figure 11 is the structural representation one of the processing module among the voice frequency signal switching apparatus embodiment two of the present invention;
Figure 12 is the structural representation of first module among the voice frequency signal switching apparatus embodiment two of the present invention;
Figure 13 a is the structural representation two of the processing module among the voice frequency signal switching apparatus embodiment two of the present invention;
Figure 13 b is the structural representation three of the processing module among the voice frequency signal switching apparatus embodiment two of the present invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
Fig. 1 is voice frequency signal switching method embodiment one process flow diagram of the present invention.As shown in Figure 1, the present embodiment voice are signal switching method frequently, when voice signal appearance is frequently switched, each frame after the switch frame is handled in the following way:
Preceding M frame voice among the embodiment provided by the invention signal frequently refer to present frame M frame voice before signal frequently.L frame voice when L frame voice frequency signal is pointed out realize voice signal switching frequently before switching before the switch frame are signal frequently.The current speech frame is a broadband signal and the former frame speech frame is a narrow-band signal; Perhaps the current speech frame is a narrow-band signal and the former frame speech frame is a broadband signal, then voice frequently signal occur switching, the current speech frame is a switch frame.
The voice of the embodiment of the invention are signal switching method frequently, by first high-frequency band signals in the present frame voice frequency signal being handled according to second high-frequency band signals in the preceding M frame voice frequency signal, so that preceding M frame voice second high-frequency band signals in the signal can be level and smooth frequently carries out the transition to first high-frequency band signals after the processing, thereby in switching the voice frequency signal process of different bandwidth, the voice transition that the high-frequency band signals of signal can be level and smooth frequently of different bandwidth is switched; At last, first high-frequency band signals after the processing and first low band signal are synthesized broadband signal, and this broadband signal is transferred to user terminal, make the user enjoy high-quality voice signal frequently.The present embodiment voice voice that carry out different bandwidth that signal switching method can be level and smooth frequently signal frequently switch, and have reduced the energy violent change and have caused the voice influence of the subjective acoustical quality difference of signal frequently, have improved the user and have answered voice quality of signals frequently.
Fig. 2 is voice frequency signal switching method embodiment two process flow diagrams of the present invention.As shown in Figure 2, the present embodiment voice are signal switching method frequently, comprising:
Concrete, the first frequency band voice in present embodiment signal frequently can be broadband voice signal or narrow-band voice frequency signals frequently.In the transmission course of voice frequency signal, when first frequency band voice frequency signal does not switch, the following two kinds of situations of branch are handled: when one, signal is broadband voice frequency signal frequently as if the first frequency band voice, then with low band signal in the broadband voice frequency signal and the synthetic broadband signal of high-frequency band signals; When two, signal was narrow-band voice frequency signal frequently as if the first frequency band voice, then with low band signal in the narrow-band voice frequency signal and the synthetic broadband signal of high-frequency band signals, at this moment, though be broadband signal, high frequency band was a sky, does not have information.
Concrete, when the voice frequency signal that different bandwidth occurs switches, second high-frequency band signals according to preceding M frame voice frequency signal, first high-frequency band signals to present frame voice frequency signal is handled, so that preceding M frame voice frequently second high-frequency band signals of signal can be smoothly transitted into first high-frequency band signals after the processing, for example, when broadband voice frequency signal switches to narrow-band voice signal frequently, since the narrow-band voice frequently the signal correspondence high-frequency band signals be sky, therefore in order to make broadband voice frequency signal smoothing switch to narrow-band voice signal frequently, need to recover the narrow-band voice frequently the signal correspondence the composition of high-frequency band signals, switch to broadband voice signal frequently and work as narrow-band voice frequency signal, because the high-frequency band signals in the broadband voice frequency signal is not empty, therefore in order to make narrow-band voice frequency signal smoothing switch to broadband voice signal frequently, need weaken the energy that switches the high-frequency band signals in the continuous multiple frames broadband voice frequency signal of back, make the high-frequency band signals of broadband voice frequency signal carry out the transition to real high-frequency band signals gradually.Handle by step 201 pair present frame voice frequency signal, what make the voice of different bandwidth frequently the high-frequency band signals in the signal can be level and smooth carries out transition, solved when switching between broadband voice frequency signal and the narrow-band voice frequency signal, owing to the energy violent change causes user's the sense of hearing uncomfortable, thereby make the user receive high-quality sound signal.Wherein, in order to simplify the process of first high-frequency band signals after obtaining handling, second high-frequency band signals of first high-frequency band signals and preceding M frame voice frequency signal directly can be weighted processing, the result who obtains after handling is first high-frequency band signals after the processing.
Concrete, after present frame voice frequency signal is handled by step 201, first high-frequency band signals before making after the processing that carries out the transition to present frame that second high-frequency band signals of signal can be level and smooth frequently of M frame voice, first high-frequency band signals after will handling by step 202 then and present frame voice are the synthetic broadband signal of first low band signal of signal frequently, the voice frequency signal that the user is received is broadband voice signal frequently, the voice frequency signal of having realized different bandwidth switches stably, helps improving the quality that the user answers sound signal.
The voice of the embodiment of the invention are signal switching method frequently, by second high-frequency band signals first high-frequency band signals in the present frame voice frequency signal is handled according to preceding M frame voice frequency signal, so that preceding M frame voice second high-frequency band signals of signal can be level and smooth frequently carries out the transition to first high-frequency band signals after the processing, thereby in switching the voice frequency signal process of different bandwidth, the voice transition that the high-frequency band signals of signal can be level and smooth frequently of different bandwidth is switched; At last, first high-frequency band signals after the processing and first low band signal are synthesized broadband signal, and this broadband signal is transferred to user terminal, makes the user enjoy high-quality voice signal.The present embodiment voice voice that carry out different bandwidth that frequently signal switching method can be level and smooth signal frequently switch, reduced the influence that the energy violent change causes the subjective acoustical quality difference of sound signal, have improved the quality that the user answers sound signal.In addition, by when the voice frequency signal that different bandwidth does not take place switches, first high-frequency band signals and the synthetic broadband signal of first low band signal with present frame voice frequency signal make the user obtain high-quality sound signal.
Based on technique scheme, optionally, signal is to the narrow-band voice frequently during conversion of signals frequently when the broadband voice, and as shown in Figure 3, the step 201 in the present embodiment comprises:
The fine structure information of the prediction of step 301, the prediction first high-frequency band signals correspondence and the envelope information of prediction.
Concrete, voice signal frequently can be decomposed into fine structure information and envelope information two parts, thereby can recover voice signal frequently according to fine structure information and envelope information.Switching in the process of narrow-band voice frequency signal by broadband voice frequency signal, because the narrow-band voice have only low band signal in the signal frequently, its corresponding high-frequency band signals is empty, switch to narrow-band voice signal frequently for what make the broadband voice frequently signal can be level and smooth, need recover the current narrow-band voice needed high-frequency band signals of signal frequently, to realize voice taking over seamlessly of signal frequently.Step 301 in the present embodiment will be predicted narrow-band voice frequently the fine structure information of the prediction of the first high-frequency band signals correspondence in the signal and the envelope information of prediction.
In order to predict present frame voice frequently the fine structure information of the prediction of signal correspondence and the envelope information of prediction more accurately, step 301 can also to the present frame voice frequently first low band signal of signal carry out the signal classification; Predict the fine structure information of prediction of the first high-frequency band signals correspondence and the envelope information of prediction according to the signal type of the first low band signal correspondence again.For example, the narrow-band voice of present frame signal frequently can be information types such as harmonic signal or anharmonic wave signal or transient signal, then can be according to the information type of narrow-band voice frequency signal correspondence, learn fine structure information and envelope information that the signal of this type should have, thereby predict the fine structure information and the envelope information of the high-frequency band signals correspondence of present frame more accurately.Wherein, voice frequency signal switching method of the present invention does not limit the signal type of narrow-band voice frequency signal.
Step 302, with the envelope signal of prediction and preceding M frame voice frequently the preceding M frame envelope information of the second high-frequency band signals correspondence of signal be weighted processing, to obtain first envelope information of the first high-frequency band signals correspondence.
Concrete, after the envelope information of the fine structure information of the prediction of the first high-frequency band signals correspondence of step 301 prediction present frame and prediction, can generate first envelope information of the first high-frequency band signals correspondence according to the envelope information of prediction and the preceding M frame voice preceding M frame envelope information of the second high-frequency band signals correspondence of signal frequently.
Particularly, the process that generates first envelope information of the first high-frequency band signals correspondence in the step 302 can realize by following dual mode, and is specific as follows:
Mode one, as shown in Figure 4, an embodiment who obtains first envelope information by step 302 can comprise:
Concrete, to the present frame voice frequently the low band signal of first low band signal and the voice frequency signal of preceding N frame of signal compare, to draw the present frame voice relative coefficient between the low band signal of first low band signal and the voice frequency signal of preceding N frame of signal frequently, for example, can be by certain band information in first low band signal of judging present frame voice frequency signal, with the voice of preceding N frame the energy size of the similar frequency bands information of the low band signal of signal or the difference of information type etc. frequently, determine the correlativity between them, to calculate desired relative coefficient.Wherein, the voice of preceding N frame frequency signal can be the mixed signal of narrow-band voice frequency signal, broadband voice frequency signal or narrow-band voice frequency signal and broadband voice frequency signal composition.
Concrete, after step 401 calculates relative coefficient, judge that this relative coefficient is whether in given threshold values scope.The effect of calculating relative coefficient be for learn the present frame voice frequently signal be that the voice signal gradual change frequently of N frame is in the past come or sudden change is come, whether their characteristic of just telling me is identical, and then judges the prediction present frame voice shared weight of high-frequency band signals of previous frame during the high-frequency band signals of signal frequently.For example, if the low band signal energy of the voice frequency signal of first low band signal of present frame voice frequency signal and former frame is suitable, and type is identical, voice frequency signal and present frame voice frequency signal that former frame then is described have higher correlativity, therefore, in order to recover present frame voice first envelope information of signal correspondence frequently accurately, when recovering first envelope information of present frame voice frequency signal correspondence, the high band envelope information of the voice frequency signal correspondence of former frame or the envelope information of transition account for bigger weight; Otherwise, if first low band signal of present frame voice frequency signal and the voice of former frame the low band signal energy of signal frequently differ greatly, and type difference, voice frequency signal and present frame voice frequency signal that former frame then is described have lower correlativity, therefore, in order to recover present frame voice first envelope information of signal correspondence frequently accurately, when recovering first envelope information of present frame voice frequency signal correspondence, the high band envelope information of the voice frequency signal correspondence of former frame or the envelope information of transition account for less weight;
If step 403 relative coefficient not in the first given threshold values scope, then is weighted processing according to first weight one and first weight two that have configured, to calculate first envelope information.Wherein, first weight one is the former frame voice weighted values of the former frame envelope information of the high-frequency band signals correspondence of signal frequently, and first weight two is the weighted value of envelope information.
Concrete, when step 402 draws relative coefficient not in the first given threshold values scope time, can learn that then present frame voice frequency signal and preceding N frame voice frequency signal have less correlativity, so, the voice of the preceding M frame envelope information of the first frequency band voice frequency signal correspondence of preceding M frame or the envelope information of transition or the former frame high band envelope information of signal correspondence frequently influence less to first envelope information, when recovering first envelope information of present frame voice frequency signal correspondence, the weight that the high band envelope information of the voice frequency signal correspondence of the preceding M frame envelope information of the first frequency band voice frequency signal correspondence of preceding M frame or the envelope information of transition or former frame accounts for is less.Therefore, according to first weight one that has configured and first weight two, just can calculate first envelope information of present frame.Wherein, first weight one is the former frame voice weighted values of the envelope information of the high-frequency band signals correspondence of signal frequently, this former frame voice signal frequently can be broadband voice signal or the narrow-band voice handled signals frequently frequently, when switching for the first time, former frame voice signal frequently are broadband voice signal frequently; And first weight two is the weighted value of the envelope information of prediction.With the envelope information of prediction and the product of first weight two, add the envelope information of former frame and the sum of products of first weight one, the weighting sum of being tried to achieve is first envelope information of present frame.In addition, later on the voice of transmission frequently signal recover these voice first envelope information of signal correspondence frequently all in this way and weight, up to voice frequently signal switch once more.
If step 404 relative coefficient in the first threshold values scope, is weighted processing according to second weight one that has configured and second weight two, to calculate the transition envelope information.Wherein, second weight one is the weighted value of the envelope information before switching, and second weight two is the weighted value of preceding M frame envelope information; Wherein, L is more than or equal to 1.
Concrete, when step 402 draws relative coefficient in given threshold values scope the time, signal is similar to the voice frequency characteristics of signals of preceding N continuous frame frequently then can to learn the present frame voice, present frame voice first envelope information of signal correspondence frequently are subjected to the envelope information of the voice frequency signal of preceding N continuous frame to influence bigger, the authenticity of M frame envelope before considering simultaneously, therefore, need and switch preceding envelope information according to preceding M frame envelope information and find the solution the present frame voice transition envelope information of signal correspondence frequently, when first envelope information of recovery present frame voice frequency signal, the envelope information of M frame envelope information and the preceding L frame of switching accounts for bigger weight before allowing; Find the solution first envelope information by the transition envelope information again.Wherein, second weight one is the weighted value of the envelope information before switching, and second weight two is the weighted value of preceding M frame envelope information.Then switch the preceding envelope information and the product of second weight one, add the sum of products of go forward the M frame envelope information and second weight two, the weighted value of being tried to achieve is the transition envelope information.
Concrete, along with the language transmission of audio signals, the broadband voice influence of signal frequently before follow-up narrow-band voice frequency signal is switched diminishes gradually, in order to make first envelope information that calculates more accurate, need carry out the adjustment of applicability to second weight one and second weight two.Because the influence of signal frequently of the broadband voice of L frame diminished gradually before follow-up sound signal was switched, therefore, the numerical value of second weight one diminishes gradually, and the numerical value of second weight two increases gradually, switches the influence of preceding envelope information to first envelope information thereby weaken.Wherein, step 405 pair second weight one and second weight two are made amendment can be by the following method: the second new weight one equals the second old weight one and deducts the first weight step-length, and the second new weight two equals the second old weight two and adds the first weight step-length; Wherein, the value of the first weight step-length for having configured.
Whether the 3rd weight one that step 406, judgement have configured is greater than first weight one.
Concrete, the 3rd weight one be the weighted value of transition envelope information, and by the size of comparison the 3rd weight one and second weight one, first envelope information that can learn present frame is subjected to the size that influences of transition envelope information.Wherein, the envelope information calculating in the transition envelope information and before switching by preceding M frame envelope information, therefore, the influence degree of the envelope information before in fact on behalf of first envelope information, the 3rd weight one switched.
If step 407 the 3rd weight one is not more than first weight one, then be weighted processing, to calculate described first envelope information according to first weight one and first weight two that have configured.
Concrete, learn that in step 406 judgement the 3rd weight one smaller or equal to first weight for the moment, the voice frequency signal that present frame voice frequency signal L frame before switching is described is far away, the influence of M frame envelope information before first envelope information mainly is subjected to, therefore, according to first weight one that has configured and first weight two, just can calculate first envelope information of present frame.
If step 408 the 3rd weight one greater than first weight one, is weighted processing according to the 3rd weight one that has configured and the 3rd weight two, to calculate first envelope information.Wherein, the 3rd weight one is the weighted value of transition envelope information, and the 3rd weight two is the weighted value of the envelope information of prediction.
Concrete, learn that in step 406 judgement the 3rd weight one greater than first weight for the moment, the present frame voice are described, and signal L frame voice frequency signal before switching is nearer frequently, envelope information before first envelope information is switched influences bigger, therefore, need find the solution first envelope information of present frame according to the transition envelope information.Wherein, the 3rd weight one is the weighted value of transition envelope information, and the 3rd weight two is the weighted value of the envelope information of prediction.The product of then transition envelope information and the 3rd weight one adds that the weighted value that the sum of products of the envelope information of prediction and the 3rd weight two is tried to achieve is first envelope information.
Concrete, revise the purpose of the 3rd weight one and the 3rd weight two in the step 409, identical with the purpose of revising second weight one and second weight two in the step 405, all be under the situation about diminishing gradually of the influence for L frame voice frequency signal before signal is switched frequently at the voice of subsequent transmission, in order to make first envelope information that calculates more accurate, the 3rd weight one and the 3rd weight two are carried out the adjustment of applicability.Because the influence of signal frequently of L frame voice diminished gradually before follow-up sound signal was switched, therefore, the numerical value of the 3rd weight one diminishes gradually, and the numerical value of the 3rd weight two increases gradually, thereby has also realized weakening the influence of the preceding envelope information of switching to first envelope information.Wherein, step 409 pair the 3rd weight one and the 3rd weight two are made amendment can be by the following method: the 3rd new weight one equals the 3rd old weight one and deducts the second weight step-length, and the 3rd new weight two equals the 3rd old weight two and adds the second weight step-length; Wherein, the value of the second weight step-length for having configured.
First weight one and first weight two and that be one, the second weight one and second weight two and be one, the three weight one and the 3rd weight two and be one; The initial value of the 3rd weight one is greater than the initial value of first weight one; First weight one and first weight two are constants of fixing.Concrete, weight one in the present embodiment and weight two, shared number percent when in fact having represented first envelope information that envelope information before switching and preceding M frame envelope information form present frame.For present frame voice signal frequently, the voice of L frame when the near more and correlativity of signal is big frequently before switching, the shared number percent of the envelope information before switching is just high more, and the shared number percent of opposite preceding M frame envelope information is just low more.When the voice frequency signal of present frame voice frequency signal L frame before switching is far away, transferring voice stable in network signal frequently is described, perhaps the present frame voice frequently signal with switch before L frame voice when signal correlation is low frequently, illustrate that present frame voice frequency characteristics of signals changes, therefore, effect of signals was less frequently for the voice of L frame before present frame voice frequency signal was switched, and it is just low more to switch the shared number percent of preceding envelope information.
In addition, the execution sequence of step 404 in the present embodiment and step 405 can exchange, and promptly can revise second weight one and second weight two earlier, according to second weight one and second weight two, calculates the transition envelope information again.Same, the execution sequence of step 408 in the present embodiment and step 409 can exchange, and promptly can revise the 3rd weight one and the 3rd weight two earlier, according to revising the 3rd weight one and the 3rd weight two, calculates first envelope information again.
Mode two, as shown in Figure 5, another embodiment that obtains first envelope information by step 302 can also comprise:
Concrete, in order to draw first envelope information more accurately, find the solution the present frame voice voice relation of the energy of the low frequency signal similar frequency bands of signal frequently of the first low band signal frequency range of signal and former frame frequently.Present embodiment can be represented relative coefficient with " corr ", by the present frame voice energy relationship of first low band signal and the low band signal similar frequency bands of the voice frequency signal of former frame of signal frequently, draw the present frame voice relative coefficient corr between the low band signal of first low band signal and the voice frequency signal of former frame of signal frequently, it is more little that energy differs, corr is big more, otherwise corr is more little.Detailed process can referring in the step 401 about the signal correlation introduction of calculating frequently of the voice of preceding N frame.
Concrete, calculate the value of corr in step 501 after, judge that the corr that calculates is whether in the second given threshold values scope.For example, present embodiment can be represented the second threshold values scope with c1～c2.
If step 503 relative coefficient not in the second threshold values scope, then is weighted processing according to first weight one and first weight two that have configured, to calculate first envelope information.Wherein, first weight one is the voice weighted value of the former frame envelope information of the high-frequency band signals correspondence of signal frequently of former frame, and first weight two is the weighted value of the envelope information of prediction; First weight one and first weight two are constants of fixing.
Concrete, when step 502 draws corr less than c1 or greater than c2, learn the present frame voice frequently first envelope information of signal correspondence switched the former frame voice frequently the envelope information of signal influence less, therefore, according to first weight one that has configured and first weight two, just can calculate first envelope information of present frame.The envelope information of prediction and the product of first weight two add the sum of products of the former frame envelope information and first weight one, and the weighted sum of being tried to achieve is first envelope information of present frame.In addition, later on the narrowband speech of transmission frequently signal all recover this narrowband speech first envelope information of signal correspondence frequently with weight in this way, up to the voice of different bandwidth frequently signal switch once more.For example: the envelope information that first weight one can be represented with a1, first weight two can be represented with b1, the former frame envelope information can be represented, predict with pre_fenv in the present embodiment can be represented with fenv, first envelope information can be represented with cur_fenv.Then step 503 can be utilized following formulate: cur_fenv=pre_fenv*a1+fenv*b1.
If step 504 relative coefficient in the second threshold values scope, judges that whether second weight one that has configured is greater than first weight one.Wherein, second weight one is the weighted value of the preceding envelope information of the switching of the high-frequency band signals correspondence of switching former frame voice frequency signal,
Concrete, if c1＜corr＜c2 then by comparing the size of second weight one and first weight one, can learn that first envelope information of present frame is switched the preceding envelope information and the influence degree of former frame envelope information.
If step 505 second weight one is not more than first weight one, then, calculate first envelope information according to first weight one and first weight two that have configured.
Concrete, learn that in step 504 judgement second weight one less than first weight for the moment, the present frame voice are described, and signal is far away from the voice frequency signal that switches former frame frequently, the influence of the envelope information before first envelope information is switched is less, therefore, according to first weight one that has configured and first weight two, just can calculate first envelope information of present frame.Then step 505 can be utilized following formulate: cur_fenv=pre_fenv*a1+fenv*b1.
If step 506 second weight one is greater than first weight one, be weighted processing according to second weight one and second weight two that configured, to calculate first envelope information.Wherein, second weight two is the weighted value of the envelope information of prediction.For example: second weight one can be represented with a2, and second weight two can be represented with b2.
Concrete, learn that in step 504 judgement second weight one greater than first weight for the moment, the present frame voice are described, and signal is nearer from the first frequency band voice frequency signal that switches former frame frequently, and the preceding envelope information of switching that first envelope information is switched former frame voice frequency signal correspondence influences bigger.Therefore, according to second weight one that has configured and second weight two, just can calculate first envelope information of present frame.Then the product of Yu Ce the envelope information and second weight two adds and switches the preceding envelope information and the sum of products of second weight one, and the weighted sum of being tried to achieve is first envelope information of present frame.Wherein, the envelope information before switching can be represented with con_fenv, and then step 506 can be utilized following formulate: cur_fenv=con_fenv*a2+fenv*b2.
Concrete, along with the language transmission of audio signals, follow-up present frame voice frequency signal is switched the influence of signal frequently of last voice and is diminished gradually, in order to make first envelope information that calculates more accurate, need carry out the adjustment of applicability to second weight one and second weight two.Because follow-up sound signal is switched the influence of signal frequently of former frame voice and is diminished gradually; And the former frame voice influence of signal frequently of signal frequently becomes big near the present frame voice.Therefore, the numerical value of second weight one diminishes gradually, and the numerical value of second weight two increases gradually, switches the influence of preceding envelope information to first envelope information thereby weaken, and strengthens the influence of the envelope information of prediction to first envelope information.Wherein, step 507 pair second weight one and second weight two are made amendment can be by the following method: the second new weight one equals the second old weight one and deducts the first weight step-length, and the second new weight two equals the second old weight two and adds the first weight step-length; Wherein, the value of the first weight step-length for having configured.
Wherein, first weight one and first weight two and that be one, the second weight one and second weight two and be one; The initial value of second weight one is greater than the initial value of first weight one.
Step 303, according to the fine structure information of first envelope information and prediction, generate first high-frequency band signals after handling.
Concrete, draw first envelope information of present frame by step 302 after, can be according to the fine structure information of first envelope information and prediction, generate first high-frequency band signals after the needed processing, thereby make first high-frequency band signals after second high-frequency band signals can be smoothly transitted into processing.
The present embodiment voice are signal switching method frequently, take place from broadband voice frequency signal to the narrow-band voice process that signal switches frequently at voice frequency signal, first high-frequency band signals after the processing that the fine structure information and first envelope information by prediction obtains present frame, thereby what can make broadband voice before switching second high-frequency band signals of signal can be level and smooth frequently carries out the transition to first high-frequency band signals after the pairing processing of signal frequently of narrow-band voice, more helps improving the quality that the user answers sound signal.
Based on technique scheme, optionally, as shown in Figure 6, the step 202 in the present embodiment comprises:
Step 601, according to present frame voice signal and the voice that switch former frame signal frequently frequently, whether first high-frequency band signals after the judgment processing needs decay.
Concrete, because narrowband speech first high-frequency band signals of signal frequently is empty, switch in the process of narrow-band voice frequency signal at broadband voice frequency signal, for first high-frequency band signals after the processing of signal correspondence frequently of the narrow-band voice that prevent to recover brings bad influence, by the narrow-band voice frequently signal extension be after the frame number of broadband signal reaches given frame number, the energy of first high-frequency band signals after handling is decayed frame by frame, reach given threshold value up to attenuation coefficient.By present frame voice frequency signal and the voice frequency signal that switches former frame, can learn present frame voice interval times between signal and the voice frequency signal that switches former frame frequently, for example, can be by the frame number of counter records narrow-band language audio signal transmission, this frame number can for reserve in advance more than or equal to 0 value.
If step 602 does not need decay, with first high-frequency band signals after handling and the synthetic broadband signal of first low band signal.
Concrete, if judging first high-frequency band signals that draws after the processing, step 601 need not to decay, first high-frequency band signals after then directly will handling and first low band signal are synthesized broadband signal.
Step 603, decay if desired, whether the decay factor of the first high-frequency band signals correspondence after the judgment processing is greater than threshold values.
Concrete, the initial value of decay factor is one; Threshold values is less than in the lump more than or equal to zero.If step 601 judges first high-frequency band signals draw after the processing and need decay, then whether the decay factor by the first high-frequency band signals correspondence after step 603 judgment processing is greater than given threshold values.
If step 604 decay factor is not more than given threshold value, first high-frequency band signals after then will handling multiply by threshold value, then with the synthetic broadband signal of first low band signal.
Concrete, if step 603 draws the value of decay factor when being not more than given threshold values, the energy that first high-frequency band signals after handling is described has decayed to certain degree, and first high-frequency band signals after the processing can not bring bad influence, just can keep this attenuation ratio later.First high-frequency band signals after then will handling multiply by threshold value, then with the synthetic broadband signal of first low band signal.
After first high-frequency band signals after if step 605 decay factor greater than given threshold value, then will be handled multiply by decay factor, again with the synthetic broadband signal of first low band signal.
Concrete, if the value that step 603 draws decay factor during greater than given threshold values, illustrates then that when this decay factor first high-frequency band signals after the processing also might cause bad sense of hearing influence, also needs to continue decay, up to given threshold values.After first high-frequency band signals after then will handling multiply by decay factor, again with the synthetic broadband signal of first low band signal.
Step 606, modification decay factor are so that decay factor reduces.
Concrete, along with the language transmission of audio signals, the voice influence of signal frequently before follow-up narrowband speech frequency signal is switched diminishes gradually, and corresponding, decay factor also should diminish gradually.
Based on technique scheme, optional, signal is when broadband voice frequency signal switches frequently when the narrow-band voice, and as shown in Figure 7, an embodiment by first high-frequency band signals after the step 201 acquisition processing in the present embodiment comprises:
Concrete, switching in the process of broadband voice frequency signal by narrow-band voice frequency signal, because the high-frequency band signals in the broadband voice frequency signal is not empty, and the high-frequency band signals of narrow-band voice frequency signal correspondence is the high-frequency band signals after sky or the processing, switch to broadband voice signal frequently for what make the narrow-band voice frequently signal can be level and smooth, need carry out energy attenuation to the high-frequency band signals in the broadband voice frequency signal, to realize voice level and smooth the switching of signal frequently.By the product of second high-frequency band signals and the 4th weight one, add the sum of products of first high-frequency band signals and the 4th weight two, the weighted value of being tried to achieve is first high-frequency band signals after the processing.
Concrete, along with the language transmission of audio signals, the narrow-band voice influence of signal frequently before follow-up broadband voice frequency signal is switched diminishes gradually.Therefore, the 4th weight one diminishes gradually, and the 4th weight two increases gradually, and until one vanishing of the 4th weight, and the 4th weight two becomes one, and promptly the voice of transmission frequency signal is broadband voice signals frequently always.
Same, as shown in Figure 8, another embodiment by first high-frequency band signals after the step 201 acquisition processing in the present embodiment can also comprise:
Concrete, because narrow-band voice first high-frequency band signals of signal frequently are empty, therefore can set a preset parameter and replace the narrow-band voice high-frequency band signals of signal frequently, wherein, this preset parameter be one more than or equal to zero constant less than the first high-frequency band signals energy.By the product of preset parameter and the 5th weight one, add the sum of products of first high-frequency band signals and the 5th weight two, the weighted value of being tried to achieve is first high-frequency band signals after the processing.
Concrete, along with the language transmission of audio signals, the narrow-band voice influence of signal frequently before follow-up broadband voice frequency signal is switched diminishes gradually.Therefore, the 5th weight one diminishes gradually, and the 5th weight two increases gradually, and until one vanishing of the 5th weight, and the 5th weight two becomes one, and promptly the voice of transmission frequency signal is real broadband voice signals frequently always.
The present embodiment voice are signal switching method frequently, take place from narrow-band voice frequency signal to the broadband voice process that signal switches frequently at voice frequency signal, by to the broadband voice frequently the high-frequency band signals of signal carry out high-frequency band signals after attenuation processing obtains handling, thereby what can make narrow-band voice before switching the high-frequency band signals of signal correspondence can be level and smooth frequently carries out the transition to high-frequency band signals after the pairing processing of signal frequently of broadband voice, more helps improving the quality that the user answers sound signal.
Wherein, the envelope information in the present embodiment can also be by representing other parameter substitutions of high-frequency band signals, for example: linear predictive coding (Linear Predictive Coding, hereinafter to be referred as: LPC) parameter, or range parameter etc.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of programmed instruction, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 9 is the structural representation of voice frequency signal switching apparatus embodiment one of the present invention.As shown in Figure 9, present embodiment sound signal switching device shifter comprises: the processing module 91 and first synthesis module 92.
The voice of the embodiment of the invention are signal switching apparatus frequently, first high-frequency band signals in the present frame voice frequency signal is handled according to second high-frequency band signals in the preceding M frame voice frequency signal by processing module, so that second high-frequency band signals can be level and smooth carry out the transition to first high-frequency band signals after the processing, thereby in switching the voice frequency signal process of different bandwidth, the voice transition that the high-frequency band signals of signal can be level and smooth frequently of different bandwidth is switched; At last, first high-frequency band signals after the processing and first low band signal are transferred to user terminal by the synthetic broadband signal of first synthesis module with this broadband signal, make the user enjoy high-quality voice signal frequently.The present embodiment voice voice that carry out different bandwidth that signal switching method can be level and smooth frequently signal frequently switch, and have reduced the energy violent change and have caused the voice influence of the subjective acoustical quality difference of signal frequently, have improved the user and have answered voice quality of signals frequently.
Figure 10 is the structural representation of voice frequency signal switching apparatus embodiment two of the present invention.As shown in figure 10, present embodiment sound signal switching device shifter is based on above-mentioned sound signal switching device shifter embodiment one, and its difference is: present embodiment sound signal switching device shifter also comprises: second synthesis module 103.
Present embodiment sound signal switching device shifter, by second synthesis module is set, can be under the voice that different bandwidth does not the take place prerequisite that signal switches frequently, with first low band signal in the first frequency band voice frequency signal of present frame and the synthetic broadband signal of first high-frequency band signals, answer voice quality of signals frequently by second synthesis module thereby help improving the user.
Based on technique scheme, optionally, signal is when narrow-band voice frequency signal switches frequently when the broadband voice, and as shown in Figure 10 and Figure 11, the processing module 101 in the present embodiment comprises:
Further, present embodiment sound signal switching device shifter can also comprise: sort module 1010 is used for first low band signal of present frame voice frequency signal is carried out the signal classification; And prediction module 1011 also is used for according to the signal type of the first low band signal correspondence prediction present frame voice fine structure information of the prediction of the first low band signal correspondence of signal and the envelope information of prediction frequently.
Present embodiment sound signal switching device shifter, dope the fine structure information of prediction of the first high-frequency band signals correspondence and the envelope information of prediction by prediction module, thereby can generate first high-frequency band signals after the processing accurately by first generation module and second generation module, thereby what make that first high-frequency band signals can be more level and smooth carries out the transition to first high-frequency band signals after the processing, more helps improving the user and answers voice quality of signals frequently.In addition, by sort module first low band signal of present frame voice frequency signal is carried out the signal classification, then, the fine structure information that prediction module obtains predicting according to signal type and the envelope information of prediction, thereby make the envelope information of the fine structure information of prediction and prediction more accurate, quality of signals is higher frequently for the voice that the user is heard.
Based on technique scheme, optionally, as Figure 10 and shown in Figure 12, first synthesis module 102 in the present embodiment comprises:
First judge module 1021 is used for according to present frame voice frequency signal and the voice frequency signal that switches former frame, and whether first high-frequency band signals after the judgment processing needs decay.
The 3rd synthesis module 1022 is used for if first high-frequency band signals that first judge module 1021 draws after the processing does not need decay, and first high-frequency band signals after handling and first low band signal are synthesized broadband signal.
The 4th synthesis module 1024 is used for if second judge module 1023 draws decay factor and is not more than given threshold values, and first high-frequency band signals after then will handling multiply by threshold value, then with the synthetic broadband signal of first low band signal.
Pentahapto becomes module 1025 to be used for if second judge module 1023 draws decay factor greater than given threshold values, after first high-frequency band signals after then will handling multiply by decay factor, again with the synthetic broadband signal of first low band signal.
First modified module 1026 is used to revise decay factor, so that decay factor reduces.
Wherein, the initial value of decay factor is one; Threshold values is less than in the lump more than or equal to zero.
Present embodiment sound signal switching device shifter, by first high-frequency band signals after handling is carried out attenuation processing, the broadband signal that present frame voice frequency signal is obtained after treatment is more accurate, more helps improving the quality that the user answers sound signal.
Based on technique scheme, optionally, signal is when broadband voice frequency signal switches frequently when the narrow-band voice, and shown in Figure 10 and Figure 13 a, the processing module 101 in the present embodiment comprises:
The first computing module 1011a is used for being weighted processing according to the 4th weight one and the 4th weight two that have configured, to calculate first high-frequency band signals after the processing; Wherein, the 4th weight one is the weighted value of second high-frequency band signals, and the 4th weight two is the weighted value of first high-frequency band signals;
It is that unit reduces the 4th weight one that the second modified module 1012a is used for the 3rd weight step-length, is that unit increases by the 4th weight two with the 3rd weight step-length, equals zero until the 4th weight one; Wherein, the 4th weight one and the 4th weight two and be one.
Same, signal is when broadband voice frequency signal switches frequently when the narrow-band voice, and shown in Figure 10 and Figure 13 b, the processing module 101 in the present embodiment can also comprise:
The second computing module 1011b is used for being weighted processing according to the 5th weight one and the 5th weight two that have configured, to calculate first high-frequency band signals after the processing; Wherein, the 5th weight one is the weighted value of the preset parameter that configured, and the 5th weight two is the weighted value of first high-frequency band signals;
It is that unit reduces the 5th weight one that the 3rd modified module 1012b is used for the 4th weight step-length, is that unit increases by the 5th weight two with the 4th weight step-length, equals zero until the 5th weight one; Wherein, the 5th weight one and the 5th weight two and be one; Wherein, preset parameter be one more than or equal to zero and less than the constant of the first high-frequency band signals energy value.
The present embodiment voice are signal switching apparatus frequently, take place from narrow-band voice frequency signal to the broadband voice process that signal switches frequently at voice frequency signal, by to the broadband voice frequently the high-frequency band signals of signal carry out high-frequency band signals after attenuation processing obtains handling, thereby what can make narrow-band voice before switching the high-frequency band signals of signal correspondence can be level and smooth frequently carries out the transition to high-frequency band signals after the pairing processing of signal frequently of broadband voice, more helps improving the quality that the user answers sound signal.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (16)
1. a voice frequency signal switching method is characterized in that, comprising:
When voice when frequently switching appears in signal, with the present frame voice frequently first high-frequency band signals of signal and preceding M frame voice frequently second high-frequency band signals of signal be weighted processing, with first high-frequency band signals after obtaining handling; Wherein, M is more than or equal to 1;
The synthetic broadband signal of first low band signal with first high-frequency band signals after the described processing and described present frame voice frequency signal.
2. voice according to claim 1 are signal switching method frequently, it is characterized in that, also comprises:
When voice frequency signal does not occur switching, with described first high-frequency band signals and the synthetic described broadband signal of described first low band signal.
3. voice according to claim 1 and 2 are signal switching method frequently, it is characterized in that, when the broadband voice frequently signal to the narrow-band voice when signal switches frequently;
Described with the present frame voice frequently first high-frequency band signals of signal and preceding M frame voice frequently second high-frequency band signals of signal be weighted, be specially with first high-frequency band signals after obtaining handling:
Predict described present frame voice the fine structure information of the prediction of the described first high-frequency band signals correspondence of signal and the envelope information of prediction frequently;
The preceding M frame envelope information that the envelope information of described prediction is corresponding with second high-frequency band signals of described preceding M frame voice frequency signal is weighted processing, to obtain first envelope information of the described first high-frequency band signals correspondence;
According to the fine structure information of described first envelope information and described prediction, generate first high-frequency band signals after the described processing.
4. voice according to claim 3 are signal switching method frequently, it is characterized in that the fine structure information of the prediction of the described first high-frequency band signals correspondence of described prediction and the envelope information of prediction are specially:
First low band signal to described present frame voice frequency signal is carried out the signal classification;
Predict the fine structure information of described prediction and the envelope information of described prediction according to the signal type of the described first low band signal correspondence.
5. voice according to claim 3 are signal switching method frequently, it is characterized in that, described with described prediction envelope signal and described before M frame voice frequently the preceding M frame envelope information of the second high-frequency band signals correspondence of signal be weighted processing, be specially with first envelope information that obtains the described first high-frequency band signals correspondence:
According to the voice of described first low band signal and the preceding N frame low band signal of signal frequently, calculate described first low band signal with described before relative coefficient between the low band signal of voice frequency signal of N frame; Wherein, N is more than or equal to 1;
Judge that described relative coefficient is whether in the first given threshold values scope;
If described relative coefficient not in the described first threshold values scope, then is weighted processing according to first weight one and first weight two that have configured, to calculate described first envelope information; Wherein, described first weight one is the former frame voice weighted values of the former frame envelope information of the high-frequency band signals correspondence of signal frequently, and described first weight two is the weighted value of described envelope information;
If described relative coefficient in the described first threshold values scope, is weighted processing according to second weight one that has configured and second weight two, to calculate the transition envelope information; Wherein, described second weight one is the weighted value of the preceding envelope information of the switching of the high-frequency band signals correspondence of L frame voice frequency signal before the described switching, and described second weight two is the weighted value of described preceding M frame envelope information; Wherein, L is more than or equal to 1;
With the first weight step-length is that unit reduces described second weight one, is that unit increases described second weight two with the first weight step-length;
Judge that whether the 3rd weight one that has configured is greater than described first weight one;
If described the 3rd weight one is not more than described first weight one, then be weighted processing, to calculate described first envelope information according to described first weight one and described first weight two that have configured;
If described the 3rd weight one greater than described first weight one, is weighted processing according to the 3rd weight one that has configured and the 3rd weight two, to calculate described first envelope information; Wherein, described the 3rd weight one is the weighted value of described transition envelope information, and described the 3rd weight two is the weighted value of the envelope information of described prediction;
With the second weight step-length is that unit reduces described the 3rd weight one, is that unit increases described the 3rd weight two with the second weight step-length, equals zero until described the 3rd weight one;
Wherein, described first weight one and described first weight two and be one, described second weight one and described second weight two and be one, described the 3rd weight one and described the 3rd weight two and be one; The initial value of described the 3rd weight one is greater than the initial value of described first weight one; Described first weight one and described first weight two are constants of fixing.
6. voice according to claim 3 are signal switching method frequently, it is characterized in that, described to described prediction envelope signal and preceding M frame voice frequently the preceding M frame envelope information of the second high-frequency band signals correspondence of signal be weighted processing, be specially with first envelope information that obtains the described first high-frequency band signals correspondence:
According to the voice of described first low band signal of present frame and the former frame low frequency signal of signal frequently, calculate the relative coefficient between the low frequency signal of voice frequency signal of described first low band signal and described former frame;
Judge that described relative coefficient is whether in the second given threshold values scope;
If described relative coefficient not in the described second threshold values scope, then is weighted processing according to first weight one and first weight two that have configured, to calculate described first envelope information; Wherein, the voice that described first weight one is described former frame are the weighted value of the former frame envelope information of the high-frequency band signals correspondence of signal frequently, and described first weight two is the weighted value of the envelope information of described prediction; Described first weight one and described first weight two are constants of fixing;
If described relative coefficient in the described second threshold values scope, judges that whether second weight one that has configured is greater than described first weight one; Wherein, described second weight one is the weighted value of the preceding envelope information of the switching of the high-frequency band signals correspondence of switching former frame voice frequency signal,
If described second weight one is not more than described first weight one, then be weighted processing, to calculate described first envelope information according to first weight one and first weight two that have configured;
If described second weight one is greater than described first weight one, be weighted processing according to described second weight one and second weight two that configured, to calculate described first envelope information; Wherein, described second weight two is the weighted value of the envelope information of described prediction;
With the second weight step-length is that unit reduces described second weight one, is that unit increases described second weight two with the second weight step-length;
Wherein, described first weight one and described first weight two and be one, described second weight one and described second weight two and be one; The initial value of described second weight one is greater than the initial value of described first weight one.
7. voice according to claim 3 are signal switching method frequently, it is characterized in that, described first high-frequency band signals after described will the processing and described present frame the voice synthetic broadband signal of first low band signal of signal frequently are specially:
According to described present frame voice frequency signal and the voice frequency signal that switches former frame, judge whether first high-frequency band signals after the described processing needs decay;
If do not need decay, with first high-frequency band signals after the described processing and the synthetic described broadband signal of described first low band signal;
Decay if desired, whether the decay factor of the described first high-frequency band signals correspondence after the judgment processing is greater than described threshold values;
If decay factor is not more than given threshold value, described first high-frequency band signals after then will handling multiply by threshold value, then with the synthetic described broadband signal of described first low band signal;
After described first high-frequency band signals after if decay factor greater than given threshold value, then will be handled multiply by decay factor, again with the synthetic described broadband signal of described first low band signal;
Revise described decay factor, so that described decay factor reduces;
Wherein, the initial value of described decay factor is one; Described threshold values is less than in the lump more than or equal to zero.
8. voice according to claim 1 and 2 are signal switching method frequently, it is characterized in that,
When the narrow-band voice frequently signal to the broadband voice when signal switches frequently;
Described with the present frame voice frequently first high-frequency band signals of signal and preceding M frame voice frequently second high-frequency band signals of signal be weighted processing, be specially with first high-frequency band signals after obtaining handling:
Be weighted processing according to the 4th weight one that has configured and the 4th weight two, to calculate described first high-frequency band signals after the processing; Wherein, described the 4th weight one is the weighted value of described second high-frequency band signals, and described the 4th weight two is the weighted value of described first high-frequency band signals;
With the 3rd weight step-length is that unit reduces described the 4th weight one, is that unit increases described the 4th weight two with the 3rd weight step-length, equals zero until described the 4th weight one; Wherein, described the 4th weight one and described the 4th weight two and be one.
9. voice according to claim 1 and 2 are signal switching method frequently, it is characterized in that, when the narrow-band voice frequently signal to the broadband voice when signal switches frequently;
Described with the present frame voice frequently first high-frequency band signals of signal and preceding M frame voice frequently second high-frequency band signals of signal be weighted processing, be specially with first high-frequency band signals after obtaining handling:
Be weighted processing according to the 5th weight one that has configured and the 5th weight two, to calculate first high-frequency band signals after the described processing; Wherein, described the 5th weight one is the weighted value of the preset parameter that configured, and described the 5th weight two is the weighted value of described first high-frequency band signals;
With the 4th weight step-length is that unit reduces described the 5th weight one, is that unit increases described the 5th weight two with the 4th weight step-length, equals zero until described the 5th weight one; Wherein, described the 5th weight one and described the 5th weight two and be one;
Wherein, described preset parameter be one more than or equal to zero and less than the constant of the described first high-frequency band signals energy value.
10. a voice frequency signal switching apparatus is characterized in that, comprising:
Processing module is used for when voice when frequently switching appears in signal, with the present frame voice frequently first high-frequency band signals of signal and preceding M frame voice frequently second high-frequency band signals of signal be weighted processing, with first high-frequency band signals after obtaining handling; Wherein, M is more than or equal to 1;
First synthesis module is used for the synthetic broadband signal of first low band signal with first high-frequency band signals after the described processing and described present frame voice frequency signal.
11. voice according to claim 10 are signal switching apparatus frequently, it is characterized in that, also comprises:
Second synthesis module is used for when voice frequency signal does not occur switching, with described first high-frequency band signals and the synthetic described broadband signal of described first low band signal.
12. according to claim 10 or 11 described voice signal switching apparatus frequently, it is characterized in that, when the broadband voice frequently signal to the narrow-band voice when signal switches frequently;
Described processing module comprises:
Prediction module is used to predict described present frame voice the fine structure information of the prediction of the described first high-frequency band signals correspondence of signal and the envelope information of prediction frequently;
First generation module is used for the preceding M frame envelope information that the envelope information of described prediction is corresponding with second high-frequency band signals of described preceding M frame voice frequency signal and is weighted processing, to obtain first envelope information of the described first high-frequency band signals correspondence;
Second generation module is used for the fine structure information according to described first envelope information and described prediction, generates first high-frequency band signals after the described processing.
13. voice according to claim 12 are signal switching apparatus frequently, it is characterized in that, also comprises: sort module is used for first low band signal of described present frame voice frequency signal is carried out the signal classification;
Described prediction module also is used for predicting the fine structure information of described prediction and the envelope information of described prediction according to the signal type of the described first low band signal correspondence.
14. voice according to claim 12 are signal switching apparatus frequently, it is characterized in that described first synthesis module comprises:
First judge module is used for judging according to described present frame voice frequency signal and the voice frequency signal that switches former frame whether first high-frequency band signals after the described processing needs decay;
The 3rd synthesis module is used for if described first high-frequency band signals that described first judge module draws after the processing does not need decay first high-frequency band signals after the described processing and described first low band signal being synthesized described broadband signal;
Second judge module is used for if described first high-frequency band signals that described first judge module draws after the processing needs decay, and whether the decay factor of the described first high-frequency band signals correspondence after the judgment processing is greater than given threshold values;
The 4th synthesis module is used for if described second judge module draws described decay factor and is not more than described given threshold values, and described first high-frequency band signals after then will handling multiply by threshold value, then with the synthetic described broadband signal of described first low band signal;
Pentahapto becomes module, is used for if described second judge module draws described decay factor greater than described given threshold values, after described first high-frequency band signals after then will handling multiply by decay factor, again with the synthetic described broadband signal of described first low band signal;
First modified module is used to revise described decay factor, so that described decay factor reduces;
Wherein, the initial value of described decay factor is one; Described threshold values is less than in the lump more than or equal to zero.
15. according to claim 10 or 11 described voice signal switching apparatus frequently, it is characterized in that, when the narrow-band voice frequently signal to the broadband voice when signal switches frequently;
Described processing module comprises:
First computing module is used for being weighted processing according to the 4th weight one and the 4th weight two that have configured, to calculate described first high-frequency band signals after the processing; Wherein, described the 4th weight one is the weighted value of described second high-frequency band signals, and described the 4th weight two is the weighted value of described first high-frequency band signals;
Second modified module, being used for the 3rd weight step-length is that unit reduces described the 4th weight one, is that unit increases described the 4th weight two with the 3rd weight step-length, equals zero until described the 4th weight one; Wherein, described the 4th weight one and described the 4th weight two and be one.
16. voice according to claim 13 are signal switching apparatus frequently, it is characterized in that, when the narrow-band voice frequently signal to the broadband voice when signal switches frequently; Described processing module comprises:
Second computing module is used for being weighted processing according to the 5th weight one and the 5th weight two that have configured, to calculate first high-frequency band signals after the described processing; Wherein, described the 5th weight one is the weighted value of the preset parameter that configured, and described the 5th weight two is the weighted value of described first high-frequency band signals;
The 3rd modified module, being used for the 4th weight step-length is that unit reduces described the 5th weight one, is that unit increases described the 5th weight two with the 4th weight step-length, equals zero until described the 5th weight one; Wherein, described the 5th weight one and described the 5th weight two and be one; Wherein, described preset parameter be one more than or equal to zero and less than the constant of the described first high-frequency band signals energy value.
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| CN2010101634063A CN101964189B (en) | 2010-04-28 | 2010-04-28 | Audio signal switching method and device |
| BR112012013306A BR112012013306B8 (en) | 2010-04-28 | 2011-04-28 | method and apparatus for switching speech or audio signals |
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| EP17151713.9A EP3249648B1 (en) | 2010-04-28 | 2011-04-28 | Method and apparatus for switching speech or audio signals |
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| JP2012541316A JP5667202B2 (en) | 2010-04-28 | 2011-04-28 | Audio signal switching method and device |
| US13/162,309 US8214218B2 (en) | 2010-04-28 | 2011-06-16 | Method and apparatus for switching speech or audio signals |
| JP2014250689A JP6027081B2 (en) | 2010-04-28 | 2014-12-11 | Audio signal switching method and device |
| JP2016201593A JP6410777B2 (en) | 2010-04-28 | 2016-10-13 | Audio signal switching method and device |
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| CN2010101634063A CN101964189B (en) | 2010-04-28 | 2010-04-28 | Audio signal switching method and device |
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Also Published As
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| EP2485029B1 (en) | 2017-06-14 |
| EP3249648B1 (en) | 2019-01-09 |
| EP2485029A1 (en) | 2012-08-08 |
| ES2718947T3 (en) | 2019-07-05 |
| JP6410777B2 (en) | 2018-10-24 |
| JP2017033015A (en) | 2017-02-09 |
| BR112012013306B8 (en) | 2021-02-17 |
| BR112012013306A2 (en) | 2016-03-01 |
| ES2635212T3 (en) | 2017-10-02 |
| KR101377547B1 (en) | 2014-03-25 |
| JP2015045888A (en) | 2015-03-12 |
| EP3249648A1 (en) | 2017-11-29 |
| CN101964189B (en) | 2012-08-08 |
| JP6027081B2 (en) | 2016-11-16 |
| EP2485029A4 (en) | 2013-01-02 |
| AU2011247719A1 (en) | 2012-06-07 |
| WO2011134415A1 (en) | 2011-11-03 |
| JP2013512468A (en) | 2013-04-11 |
| AU2011247719B2 (en) | 2013-07-11 |
| KR20120074303A (en) | 2012-07-05 |
| BR112012013306B1 (en) | 2020-11-10 |
| JP5667202B2 (en) | 2015-02-12 |
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