CN103001598B - Apparatus for processing audio and use the audio system of this apparatus for processing audio - Google Patents
Apparatus for processing audio and use the audio system of this apparatus for processing audio Download PDFInfo
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Abstract
A kind of apparatus for processing audio, it comprises a shaping device.This shaping device receives a digital input audio signal, and on an output, produces an output audio signal according to digital input audio signal.Above-mentioned shaping device comprises a gain adjusting unit and a moulding unit.Gain adjusting unit receives digital input audio signal, and adjustment digital input audio signal is to produce audio signal after a gain.Audio signal after moulding unit receiving gain.When shaping device operates in a first mode, moulding unit carries out moulding to produce a moulding rear audio signal to the envelope of audio signal after gain, and moulding rear audio signal is as output audio signal.
Description
Technical field
The invention relates to a kind of audio system, relate to a kind of apparatus for processing audio especially, be applicable to audio system, its irritating sonic boom (pop) produced between can eliminating the volume of audio system adjustment period and tick (click) sound.
Background technology
In existing digital audio system, when digital audio system the volume of sound play just by adjustment time, the sonic boom (pop) that is not expected and tick (click) sound may be there is.In the case, user may hear irritating sound.Fig. 1 be represent the volume of audio system adjustment period between the change of digital audio and video signals.In FIG, digital audio and video signals Saul presents with a sine wave.Consult Fig. 1, when audio system will tune up volume on time point T1, the amplitude of digital audio and video signals will increase at time point T1.Cause the loud speaker of audio system to play out sonic boom and Click in the amplitude increase of time point T1, it reduce the play quality of audio system.
Therefore, expect to provide a kind of apparatus for processing audio, its irritating sonic boom produced between can eliminating volume adjustment period and Click.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of apparatus for processing audio, its irritating sonic boom produced between can eliminating volume adjustment period and Click.
The present invention proposes a kind of apparatus for processing audio, and it comprises a shaping device.This shaping device receives a digital input audio signal, and on an output, produces an output audio signal according to digital input audio signal.Above-mentioned shaping device comprises a gain adjusting unit and a moulding unit.Gain adjusting unit receives digital input audio signal, and adjustment digital input audio signal is to produce audio signal after a gain.Audio signal after moulding unit receiving gain.When shaping device operates in a first mode, moulding unit carries out moulding to produce a moulding rear audio signal to the envelope of audio signal after gain, and moulding rear audio signal is as output audio signal.
The present invention proposes a kind of audio system, and it comprises a shaping device, a digital analog converter and a broadcast unit.Shaping device receives a digital input audio signal, and on an output, produces an output audio signal according to digital input audio signal.Digital analog converter receives output audio signal, and output audio signal is converted to a simulated audio signal.Broadcast unit receives simulated audio signal, and plays sound according to simulated audio signal; Above-mentioned shaping device comprises a gain adjusting unit and a moulding unit.Gain adjusting unit receives digital input audio signal, and adjustment digital input audio signal is to produce audio signal after a gain.Audio signal after moulding unit receiving gain.When shaping device operates in a first mode, moulding unit carries out moulding to produce a moulding rear audio signal to the envelope of audio signal after gain, and moulding rear audio signal is as output audio signal.
According to above-described embodiment, when the adjustment of gain adjusting unit in the flrst mode digital input audio signal is to change the amplitude of digital input audio signal, the wave volume broadcasted becomes larger or less.When wave volume is just by adjustment, because the envelope of moulding rear audio signal is comparatively level and smooth, irritating sonic boom (pop) and tick (click) sound can not occur, or can not easily discover by people's ear.
Accompanying drawing explanation
The change of digital audio and video signals between Fig. 1 represents the volume of audio system adjustment period;
Fig. 2 represents the audio system according to one embodiment of the invention;
Fig. 3 represents audio signal after the gain in the audio system of Fig. 2;
Fig. 4 represents the moulding rear audio signal in the audio system of Fig. 2;
Fig. 5 represents the frequency spectrum of audio signal after gain in fig. 2;
Fig. 6 represents the frequency spectrum of moulding rear audio signal in fig. 2;
Fig. 7 represents the audio system according to another embodiment of the present invention.
Embodiment
Some vocabulary is employed to refer to specific assembly in the middle of this specification and claims.Those skilled in the art should understand, and hardware manufacturer may call same assembly with different nouns.This specification and claims not using the difference of title as distinguishing the mode of assembly, but using assembly difference functionally as the criterion distinguished." comprising " mentioned in the middle of specification and claim is in the whole text an open term, therefore should be construed to " comprise but be not limited to ".In addition, " couple " word comprise directly any at this and be indirectly electrically connected means.Therefore, if describe first device in literary composition to be coupled to the second device, then represent first device and can directly be electrically connected in the second device, or be indirectly electrically connected to the second device by other device or connection means.
Fig. 2 represents the audio system according to one embodiment of the invention.Consult Fig. 2, audio system 2 comprises input processing unit 20, shaping device (shaper) 21, output processing unit 22, digital-analog convertor (digital-to-analog converter, DAC) 23 and a broadcast unit 24.Wherein, input processing unit 20, shaping device 21 and output processing unit 22 form an apparatus for processing audio 200.Input processing unit 20 receives a digital audio-frequency data Din, and processes this digital audio-frequency data Din to produce a digital input audio signal AUin.In this embodiment, input processing unit 20 is implemented with a Sigma-Delta modulator.Sigma-Delta modulator 20 couples of digital audio-frequency data Din carry out modulation, to produce digital input audio signal AUin.Shaping device 21 receives digital input audio signal AUin, and produces an output audio signal AUout according to digital input audio signal AUin in the output Tout of shaping device 21.
Consult Fig. 2, shaping device 21 comprises moulding unit 211, control unit 212, detecting unit 213 of gain adjusting unit 210, one and interrupteur SW 1 and SW2.Gain adjusting unit 210 receives digital input audio signal AUin, and adjusts digital input audio signal AUin to produce audio signal AU210 after gain by a gain parameter.Adjustment digital input audio signal AUin opportunity origin self-detection unit 213 control signal S213A controlled, the generation of control signal S213A will in hereinafter describing.In this embodiment, gain parameter is changeable, its along with by gain adjusting unit 210 one of to receive the value of adjustment signal S210 and change.Under the general modfel of shaping device 21, the value of adjustment signal S210 is for immobilizing, and gain parameter is also for immobilizing, and after gain, the amplitude of audio signal AU210 can not change.When gain parameter becomes larger or less along with the change of the value of adjustment signal S210, shaping device 21 enters to adjustment modes by general modfel.In other words, the gain parameter under adjustment modes is greater than or less than the gain parameter before shaping device 21 operates in adjustment modes.Under adjustment modes, during gain adjusting unit 210 adjusts digital input audio signal AUin, after gain, the amplitude of audio signal AU210 increases or reduces.
Audio signal AU210 after moulding unit 211 receiving gain, carries out moulding to the envelope (envelope) of audio signal AU210 after gain, to produce moulding rear audio signal AU211.Moulding unit 211 can be implemented by a filter.In this embodiment, moulding unit 211 is implemented with raised cosine filter (raise-cosinefilter).But raised cosine filter is only a demonstration example, does not limit the present invention.Moulding unit 211 can be implemented the filter of other types.
Interrupteur SW 1 is coupled between moulding unit 211 and output Tout, and is subject to switching signal S212A and controls.Interrupteur SW 2 is coupled between gain adjusting unit 210 and output Tout, and is subject to switching signal S212 and controls.
Detecting unit 213 couples output Tout to receive output audio signal AUout.Detecting unit 213 detects multiple zero-crossing points (zero-crossing point) of output audio signal AUout, and produces control signal S213A according to detecting result.In other words, control signal S213A can indicate the generation of the zero-crossing point of audio signal AUout.Gain adjusting unit 210 and control unit 213 all reception control signal S213A.
Control unit 212 not only receives the control signal S213A from detecting unit 213, also receives adjustment signal S210.Control unit 212 produces switching signal S212A and S212B according to control signal S213A and adjustment signal S210.
The operation of shaping device 21 hereafter will be described.
As mentioned above, when gain parameter becomes larger or less along with the change of the value of adjustment signal S210, shaping device 21 enters adjustment modes by general modfel.Under adjustment modes, output audio signal AUout has multiple zero-crossing point, and these zero-crossing points are detected by detecting unit 213.Under adjustment modes, detect according to zero-crossing point the control signal S213A be associated, the time point that gain adjusting unit 210 occurs at least one zero-crossing point raises whole digital input audio signal AUin.For example, in this embodiment, under adjustment modes, the time point of gain adjusting unit 210 nine zero-crossing point generations in above-mentioned multiple zero-crossing point raises whole digital input audio signal AUin to increase the amplitude of digital input audio signal AUin.In other words, the number of times adjusting digital input audio signal AUin by gain adjusting unit 210 equals nine.As shown in Figure 3, nine time points occurred at nine zero-crossing points derived from the amplitude of audio signal AU210 after the gain of digital input audio signal AUin increase.Then, after the 211 pairs of gains of moulding unit, the envelope of audio signal AU210 carries out moulding, to produce moulding rear audio signal AU211.As shown in the 3rd and 4 figure, after envelope is moulding, the envelope EN211 of moulding rear audio signal AU211 is comparatively more level and smooth than the envelope EN210 of audio signal AU210 after gain.
Fig. 5 represents the frequency spectrum of audio signal AU210 after gain.Fig. 6 then represent through envelope moulding processed moulding after the frequency spectrum of audio signal AU211.Relatively audio signal AU211 after audio signal AU210 and gain after gain, between frequency 20Hz to 20kHa, except major frequency components, in Fig. 6, the energy of other frequency contents of moulding rear audio signal AU211 is lower than the energy of other frequency contents of audio signal AU210 after gain.
Control unit 212 also receives adjustment signal S210.When gain parameter becomes larger or less along with the change of the value of adjustment signal S210, control unit 212 learns that shaping device 21 enters to adjustment modes by general modfel.In adjustment modes, control unit 21 produces switching signal S212A and switching signal S212B according to control signal S213A, with difference actuating switch SW1 and closing switch SW2 on the time point occurred at above-mentioned nine zero-crossing points.At this moment, have and transmit through the interrupteur SW 1 of conducting compared with the moulding rear audio signal AU211 of smoothed envelope EN211, using as output audio signal AUout.
According to the embodiment of 2-4 figure, under adjustment modes, control unit 212 actuating switch SW1 closing switch SW2 nine times, in other words, change by control unit 212 number of times that interrupteur SW 1 and the number of times of the state of SW2 equal to be adjusted by gain adjusting unit 210 digital input audio signal AUin.Specifically, control unit 212, on the time point of above-mentioned nine zero-crossing points generation, carrys out actuating switch SW1 and closing switch SW2 through switching signal S212A and S212B respectively.In other embodiments, under adjustment modes, only actuating switch SW1 closing switch SW2 be once for control unit 212.Specifically, when shaping device 21 enters adjustment modes according to the change of the value of adjustment signal S210 by general modfel, on the time point that control unit 212 occurs at one of output audio signal AUout zero-crossing point, carry out actuating switch SW1 and closing switch SW2 through switching signal S212A and S212B respectively.Connect folding, until shaping device 21 leaves adjustment modes, the conducting state of interrupteur SW 1 and the closed condition of interrupteur SW 2 continue to maintain.
Will in description by adjustment modes to the switching of general modfel.In 2nd ~ 4 figure, at control unit 212 actuating switch SW1(or closing switch SW2 on the time point that above-mentioned nine zero-crossing points occur) after, the time point that control unit 212 occurs in one of output audio signal AUout zero-crossing point carrys out closing switch SW1 and actuating switch SW2 through control signal S212A and control signal S212B respectively, for example, an above-mentioned time point is the time point that first zero-crossing point occurs after above-mentioned nine zero-crossing points.In another embodiment, at control unit 212 actuating switch SW1(or closing switch SW2) after one section of predetermined time period, the time point that control unit 212 occurs in one of output audio signal AUout zero-crossing point carrys out closing switch SW1 and actuating switch SW2 through control signal S212A and control signal S212B respectively, for example, an above-mentioned time point is the time point that first zero-crossing point occurs after above-mentioned predetermined time period.This predetermined time period decides according to being used for the type of the filter realizing moulding unit 211.Then, shaping device 21 switches to and operates in general modfel.Under general modfel, after gain, audio signal AU210 transmits through the interrupteur SW 2 of conducting, using as output audio signal AUout.
In another embodiment, detecting unit 213 more judges whether output audio signal AUout is in a stable state, and produces a control signal S213B according to detecting result.Under adjustment modes, when detecting unit 213 judges that output audio signal AUout is in stable state, shaping device 21 switches to and operates in general modfel.For example, when control unit 212 on the time point that above-mentioned nine zero-crossing points occur actuating switch SW1 and closing switch SW2, output audio signal AUout may be in stable state after above-mentioned nine zero-crossing points; When control unit 212 on the time point that a zero-crossing point occurs actuating switch SW1 and closing switch SW2, output audio signal AUout may be in stable state after an above-mentioned zero-crossing point.In this embodiment, control unit 212 is reception control signal S213B more, and therefore control unit 212 produces switching signal S212A and S212B according to detecting relevant control signal S213A to zero-crossing point and detect relevant control signal S213B with stable state.According to control signal S213B, control unit 212 can learn whether shaping device 21 will operate in general modfel.When control unit 212 learns that shaping device 21 will operate in general modfel, control unit 212 produces switching signal S212A and switching signal, with difference closing switch SW1 and actuating switch SW2 on the time point occurred in one of output audio signal AUout zero-crossing point.Then, shaping device 21 switches to and operates in general modfel.Under general modfel, after gain, audio signal AU210 transmits through the interrupteur SW 2 of conducting, using as output audio signal AUout.In this embodiment, one of to be determined that position is punctual when the amplitude of output audio signal AUout maintains by gain parameter, then aforementioned stable state is occurred.
Consult Fig. 2, output processing unit 22 receives output audio signal AUout and processes output audio signal AUout.In this embodiment, output processing unit 22 couples of output audio signal AUout process, to perform sound effect adjustment.The output audio signal AUout processed is sent to digital analog converter 23.The output audio signal AUout processed is converted to a simulated audio signal AAUout by digital analog converter 23.Broadcast unit 24 receives simulated audio signal AAUout, and plays sound according to simulated audio signal AAUout.In another embodiment, output processing unit 22 can omit.Namely, output audio signal AUout is directly sent to digital analog converter 23 to carry out the conversion of numeral to simulation.
According to above-described embodiment, when under adjustment modes, gain adjusting unit 210 adjusts digital input audio signal AUin to change the amplitude of digital input audio signal AUin, the wave volume broadcasted from broadcast unit 24 becomes larger or less.When wave volume is just by adjustment, because the envelope of moulding rear audio signal AU211 is comparatively level and smooth, irritating sonic boom (pop) may can not occur with tick (click) sound, or can not easily discover by people's ear.
Consult Fig. 5, under adjustment modes, if it is moulding not have envelope, the audio band energy not comprising major frequency components can cause irritating sonic boom and Click.According to above-mentioned, under adjustment modes, between frequency 20Hz to 20kHz, except major frequency components, in Fig. 6, the energy of other frequency contents of moulding rear audio signal AU211 is lower than the energy of other frequency contents of audio signal AU210 after gain in Fig. 5.Therefore, after envelope is moulding, according to other frequency contents of audio signal AU211 after gain and the sound produced be not easy to be discovered by people's ear.
Fig. 7 represents the audio system according to another embodiment of the present invention.As shown in Figure 7, audio system 7 comprises input processing unit 70, preposition reinforcement unit 71, shaping device 72, output processing unit 73, digital analog converter (digital-to-analog converter, DAC) 74 and a broadcast unit 75.Wherein, input processing unit 70, preposition reinforcement unit 71, shaping device 72 and output processing unit 73 form an apparatus for processing audio 700.Input processing unit 70 receives a digital audio-frequency data Din, and processes this digital audio-frequency data Din to produce a digital input audio signal AUin.In this embodiment, input processing unit 70 is implemented with a Sigma-Delta modulator.Sigma-Delta modulator 70 couples of digital audio-frequency data Din carry out modulation, to produce digital input audio signal AUin.Preposition reinforcement unit 71 receives the digital input audio signal AUin from input processing unit 70, and power is increased in the energy of the multiple frequency contents in the audio band (20Hz ~ 20kHz) of digital input audio signal AUin.The digital input audio signal AUin that the preposition reinforcement unit 71 of shaping device 72 increases, and produce an output audio signal AUout according to the digital input audio signal AUin of increase in the output Tout of shaping device 72.In this embodiment, shaping device 72 is in adjustment modes always.In other words, under shaping device 72 operates in single-mode.
Consult Fig. 7, shaping device 72 comprises gain adjusting unit 720, moulding unit 721 and a detecting unit 722.Gain adjusting unit 720 receives digital input audio signal AUin, and adjusts digital input audio signal AUin to produce audio signal AU720 after gain by a gain parameter.Adjustment digital input audio signal AUin opportunity origin self-detection unit 722 control signal S722 controlled, the generation of control signal S722 will in hereinafter describing.In this embodiment, gain parameter is changeable, its along with by gain adjusting unit 720 one of to receive the value of adjustment signal S720 and change.When the value of adjustment signal S720 is for immobilizing, gain parameter is also for immobilizing.In the case.After gain, the amplitude of audio signal AU720 can not change.When gain parameter becomes larger or less along with the change of the value of adjustment signal S720, after gain, the amplitude of audio signal AU720 increases or reduces.
Audio signal AU720 after moulding unit 721 receiving gain, carries out moulding to the envelope of audio signal AU720 after gain., to produce moulding rear audio signal AU211.Moulding unit 721 can be implemented by a filter.In this embodiment, moulding unit 721 is implemented with raised cosine filter.But raised cosine filter is only a demonstration example, does not limit the present invention.Moulding unit 211 can be implemented the filter of other types.
Detecting unit 722 couples output Tout to receive output audio signal AUout.Detecting unit 722 detects multiple zero-crossing points of output audio signal AUout, and produces control signal S722 according to detecting result.In other words, control signal S722 can indicate the generation of the zero-crossing point of audio signal AUout.Control signal S722 is sent to gain adjusting unit 720.Therefore, according to control signal S722, the time point that gain control unit 720 occurs at least one zero-crossing point raises whole digital input audio signal AUin, to produce audio signal AU720 after gain.Then, after the 721 pairs of gains of moulding unit, the envelope of audio signal AU720 carries out moulding, to produce moulding rear audio signal AU721.In this embodiment, moulding rear audio signal AU721 is directly through as output audio signal AUout.
Consult Fig. 7, output processing unit 73 receives output audio signal AUout and processes output audio signal AUout.In this embodiment, output processing unit 73 couples of output audio signal AUout process, to perform sound effect adjustment.The output audio signal AUout processed is sent to digital analog converter 74.The output audio signal AUout processed is converted to a simulated audio signal AAUout by digital analog converter 74.Broadcast unit 75 receives simulated audio signal AAUout, and plays sound according to simulated audio signal AAUout.In another embodiment, output processing unit 73 can omit.Namely, output audio signal AUout is directly sent to digital analog converter 74 to carry out the conversion of numeral to simulation.
In this embodiment, when the moulding unit 721 implemented with filter (such as raised cosine filter) by a transfer function (transfer function) to gain after the envelope of audio signal AU720 carry out moulding time, preposition reinforcement unit 71 by contrast to envelope moulding another transfer function of transfer function of using to the energy of multiple frequency content in the voiced band being increased in digital input audio signal AUin.
According to above-described embodiment, when under adjustment modes, gain adjusting unit 720 adjusts digital input audio signal AUin to change the amplitude of digital input audio signal AUin, the wave volume broadcasted from broadcast unit 75 becomes larger or less.When wave volume is just by adjustment, because the envelope of output audio signal AUout is comparatively level and smooth, irritating sonic boom can not occur with Click is possible, or can not easily discover by people's ear.In addition, due to the operation of preposition reinforcement unit 71, in the voiced band of digital input audio signal AUin, the power of multiple frequency content increases.Therefore, after envelope is moulding, can not weakens at the original frequency composition of the voiced band of digital input audio signal AUin, avoid the audio distortions played out.
Although the present invention discloses as above in a preferred embodiment thereof; so itself and be not used to limit the present invention, any the technical staff in the technical field, without departing from the scope of the present invention; can do some to change, the scope that therefore protection scope of the present invention should define with claim is as the criterion.
Claims (31)
1. an apparatus for processing audio, comprising:
One shaping device, receives a digital input audio signal, and on an output, produces an output audio signal according to this digital input audio signal;
Wherein, this shaping device comprises:
One gain adjusting unit, receives this digital input audio signal, and adjusts this digital input audio signal to produce audio signal after a gain;
One moulding unit, receives audio signal after this gain;
One detecting unit, couples this output, receive this output audio signal and the multiple zero-crossing points detecting this output audio signal to produce one first control signal; And
One control unit, receive this first control signal in the flrst mode, and produce one first switching signal and one second switching signal according to this first control signal, difference conducting first switch and closedown second switch at least one time point when at least one occurs in the plurality of zero-crossing point;
Wherein, when this shaping device operates in this first mode, this moulding unit carries out moulding to produce a moulding rear audio signal to the envelope of audio signal after this gain, and this moulding rear audio signal is as this output audio signal.
2. apparatus for processing audio as claimed in claim 1, wherein, this shaping device more comprises:
One first switch, couples between this moulding unit and this output, and controlled by this first switching signal; And
One second switch, couples between this gain adjusting unit and this output, and controlled by this second switching signal;
Wherein, in the first mode, this gain adjusting unit receives this first control signal, and according to this first control signal in the plurality of zero-crossing point at least one occur time at least one time point on adjust this digital input audio signal.
3. apparatus for processing audio as claimed in claim 2, wherein, in the first mode, on this at least one time point when at least one occurs this first switch in the plurality of zero-crossing point after this first switch of conducting, this control unit produces this first switching signal and this second switching signal, time point when occurring with one in the plurality of zero-crossing point closes this first switch and this second switch of conducting respectively, and this shaping device switches to and operates in one second pattern.
4. apparatus for processing audio as claimed in claim 2, wherein, in the first mode, in this first switch in the plurality of zero-crossing point at least one occur time this at least one time point on this first switch of conducting a predetermined time period after, this control unit produces this first switching signal and this second switching signal, time point when occurring with one in the plurality of zero-crossing point closes this first switch and this second switch of conducting respectively, and this shaping device switches to and operates in one second pattern.
5. apparatus for processing audio as claimed in claim 4, wherein, this moulding unit is implemented with a filter, and this predetermined time period decides according to the type of this filter.
6. apparatus for processing audio as claimed in claim 5, wherein, this moulding unit is implemented with a raised cosine filter.
7. apparatus for processing audio as claimed in claim 2,
Wherein, in the first mode, this detecting unit more judges whether this output audio signal is in a stable state, and produces one second control signal according to judged result; And
Wherein, when this detecting unit judges that this output audio signal is in this stable state, this control unit produces on time point when this first switching signal and this second switching signal occur with one in the plurality of zero-crossing point and closes this first switch and this second switch of conducting respectively, and this shaping device switches to and operates in one second pattern.
8. apparatus for processing audio as claimed in claim 7, wherein, this gain adjusting unit adjusts this digital input audio signal with a gain parameter, and this gain parameter when this shaping device operates in the first mode is greater than or less than this gain parameter before this shaping device operates in this first mode.
9. apparatus for processing audio as claimed in claim 1, more comprises:
One preposition reinforcement unit, in the first mode, in order to strengthen this digital input audio signal voiced band in the energy of multiple frequency content.
10. apparatus for processing audio as claimed in claim 9, wherein, when this moulding unit carries out moulding with one first transfer function to the envelope of this digital input audio signal, this preposition reinforcement unit strengthens the energy of multiple frequency content in the voiced band of this digital input audio signal with one second transfer function, this second transfer function is in contrast to this first transfer function.
11. apparatus for processing audio as claimed in claim 1, wherein, in the flrst mode, the envelope of this moulding rear audio signal is more level and smooth than the envelope of audio signal after this gain.
12. apparatus for processing audio as claimed in claim 1, wherein, this gain adjusting unit adjusts this digital input audio signal with a gain parameter, and this gain parameter is variable.
13. apparatus for processing audio as claimed in claim 1, more comprise:
One processing unit, receives a digital audio-frequency data, and processes this digital audio-frequency data to produce this digital input audio signal.
14. apparatus for processing audio as claimed in claim 13, wherein, this processing unit is implemented with a Sigma-Delta modulator.
15. apparatus for processing audio as claimed in claim 1, more comprise:
One processing unit, receives this output audio signal, and processes this output audio signal to carry out sound broadcasting.
16. apparatus for processing audio as claimed in claim 1, wherein, when this shaping device operates under one second pattern, after this gain, audio signal is sent to this output as this output audio signal.
17. apparatus for processing audio as claimed in claim 16, wherein, after this gain, the amplitude of audio signal changes in the first mode, and in this second mode after this gain the amplitude of audio signal do not change.
18. 1 kinds of audio systems, comprising:
One shaping device, receives a digital input audio signal, and on an output, produces an output audio signal according to this digital input audio signal;
And
One broadcast unit, receives this simulated audio signal, and plays sound according to this simulated audio signal;
Wherein, this shaping device comprises:
One detecting unit, couples this output, receive this output audio signal and the multiple zero-crossing points detecting this output audio signal to produce one first control signal;
One control unit, receive this first control signal in the flrst mode, and produce one first switching signal and one second switching signal according to this first control signal, difference conducting first switch and closedown second switch at least one time point when at least one occurs in the plurality of zero-crossing point; One digital analog converter, receives this output audio signal, and this output audio signal is converted to a simulated audio signal;
One gain adjusting unit, receives this digital input audio signal, and adjusts this digital input audio signal to produce audio signal after a gain; And
One moulding unit, receives audio signal after this gain;
Wherein, when this shaping device operates in this first mode, this moulding unit carries out moulding to produce a moulding rear audio signal to the envelope of audio signal after this gain, and this moulding rear audio signal is as this output audio signal.
19. audio systems as claimed in claim 18, wherein, this shaping device more comprises:
One first switch, couples between this moulding unit and this output, and controlled by this first switching signal; And
One second switch, couples between this gain adjusting unit and this output, and controlled by this second switching signal;
Wherein, in the first mode, this gain adjusting unit receives this first control signal, and according to this first control signal in the plurality of zero-crossing point at least one occur time at least one time point on adjust this digital input audio signal.
20. audio systems as claimed in claim 19, wherein, in the first mode, on this first switch this at least one time point in the plurality of zero-crossing point during the generation of this at least one after this first switch of conducting, this control unit produces on time point when this first switching signal and this second switching signal occur with one in the plurality of zero-crossing point and closes this first switch and this second switch of conducting respectively, and this shaping device switches to and operates in one second pattern.
21. audio systems as claimed in claim 19, wherein, in the first mode, on this first switch this at least one time point in the plurality of zero-crossing point during the generation of this at least one, this first switch of conducting is after a predetermined time period, this control unit produces on time point when this first switching signal and this second switching signal occur with one in the plurality of zero-crossing point and closes this first switch and this second switch of conducting respectively, and this shaping device switches to and operates in one second pattern.
22. audio systems as claimed in claim 21, wherein, this moulding unit is implemented with a filter, and this predetermined time period decides according to the type of this filter.
23. audio systems as claimed in claim 22, wherein, this moulding unit is implemented with a raised cosine filter.
24. audio systems as claimed in claim 19,
Wherein, in the first mode, this detecting unit more judges whether this output audio signal is in a stable state, and produces one second control signal according to judged result; And
Wherein, when this detecting unit judges that this output audio signal is in this stable state, this control unit produces on time point when this first switching signal and this second switching signal occur with one in the plurality of zero-crossing point and closes this first switch and this second switch of conducting respectively, and this shaping device switches to and operates in one second pattern.
25. audio systems as claimed in claim 24, wherein, this gain adjusting unit adjusts this digital input audio signal with a gain parameter, and this gain parameter when this shaping device operates in the first mode is greater than or less than this gain parameter before this shaping device operates in this first mode.
26. audio systems as claimed in claim 18, more comprise:
One preposition reinforcement unit, in the first mode, strengthens the energy of multiple frequency content in the voiced band of this digital input audio signal.
27. audio systems as claimed in claim 26, wherein, when this moulding unit carries out moulding with one first transfer function to the envelope of this digital input audio signal, this preposition reinforcement unit strengthens the energy of multiple frequency content in the voiced band of this digital input audio signal with one second transfer function, this second transfer function is in contrast to this first transfer function.
28. audio systems as claimed in claim 18, wherein, in the flrst mode, the envelope of this moulding rear audio signal is more level and smooth than the envelope of audio signal after this gain.
29. audio systems as claimed in claim 18, more comprise:
One processing unit, receives a digital audio-frequency data, and processes this digital audio-frequency data to produce this digital input audio signal.
30. audio systems as claimed in claim 29, wherein, this processing unit is implemented with a Sigma-Delta modulator.
31. audio systems as claimed in claim 18, more comprise:
One processing unit, receives this output audio signal, and processes this output audio signal to carry out sound broadcasting.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201161509331P | 2011-07-19 | 2011-07-19 | |
| US61/509,331 | 2011-07-19 | ||
| US201161525447P | 2011-08-19 | 2011-08-19 | |
| US61/525,447 | 2011-08-19 | ||
| US13/540,296 US9252730B2 (en) | 2011-07-19 | 2012-07-02 | Audio processing device and audio systems using the same |
| US13/540,296 | 2012-07-02 |
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| CN103001598A CN103001598A (en) | 2013-03-27 |
| CN103001598B true CN103001598B (en) | 2015-10-28 |
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| CN201210245780.7A Expired - Fee Related CN103001598B (en) | 2011-07-19 | 2012-07-16 | Apparatus for processing audio and use the audio system of this apparatus for processing audio |
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| CN105635916A (en) * | 2015-12-28 | 2016-06-01 | 小米科技有限责任公司 | Audio processing method and apparatus |
| CN112199070B (en) * | 2020-10-14 | 2022-11-25 | 展讯通信（上海）有限公司 | Audio processing method and device, storage medium and computer equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1190773A (en) * | 1997-02-13 | 1998-08-19 | 合泰半导体股份有限公司 | Method estimating wave shape gain for phoneme coding |
| US5808575A (en) * | 1995-11-06 | 1998-09-15 | Sony Corporation | Gain varying device capable of varying each gain of analog and digital signals |
| CN102074241A (en) * | 2011-01-07 | 2011-05-25 | 蔡镇滨 | Method for realizing voice reduction through rapid voice waveform repairing |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5808575A (en) * | 1995-11-06 | 1998-09-15 | Sony Corporation | Gain varying device capable of varying each gain of analog and digital signals |
| CN1190773A (en) * | 1997-02-13 | 1998-08-19 | 合泰半导体股份有限公司 | Method estimating wave shape gain for phoneme coding |
| CN102074241A (en) * | 2011-01-07 | 2011-05-25 | 蔡镇滨 | Method for realizing voice reduction through rapid voice waveform repairing |
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