CN101399559B - Sound signal processing device - Google Patents
Sound signal processing device Download PDFInfo
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- CN101399559B CN101399559B CN 200710140672 CN200710140672A CN101399559B CN 101399559 B CN101399559 B CN 101399559B CN 200710140672 CN200710140672 CN 200710140672 CN 200710140672 A CN200710140672 A CN 200710140672A CN 101399559 B CN101399559 B CN 101399559B
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Abstract
The invention discloses an aural signal processing device which comprises a clock generating module, a processing module, an amplifier module, an output module. The clock generating module is used for generating a clock signal. The processing module is coupled in the clock generating module and used for processing the clock signal so as to generate a processing signal. The amplifier clock is coupled in the processing module and used for gaining and amplifying the processing signal and generating an amplifying signal. The output module is coupled in the amplifying module and used for outputting the amplifying signal. The aural signal processing signal can avoid the problems deriving from interfering receiving of an AM broadcast when a D type audio amplifier is used.
Description
Technical field
The invention relates to a kind of audio-signal processing apparatus, espespecially a kind of audio-signal processing apparatus that receives in order to avoid interference amplitude modulation broadcasting.
Background technology
Output waveform is that the audio frequency amplifier of pulse width modulation (PWM) pattern generally is commonly referred to as D class (CLASS-D) audio frequency amplifier, because the waveform of D class audio amplifier output is square wave, contains a large amount of high order harmonic component compositions.If the output of D class audio amplifier is added that the connecting line of equivalent length connects load afterwards again, then this connecting line will be as transmitting antenna, for arround electronic equipment cause serious interference, wherein disturb the most obvious with the reception to amplitude modulation (AM) broadcasting again.
The frequency band range of amplitude modulation broadcasting arrives between the 1.8M hertz (Hz) between 520K hertz (Hz) usually, yet this frequency band range just the position on the fundamental frequency or harmonic frequency of the switching frequency of D class audio amplifier, so when one group of D class audio amplifier moves, can cause serious interference to the reception of amplitude modulation (AM) broadcasting.When one group of D class audio amplifier and tuner combine, the electric field strength of D class audio amplifier radiation can be far away from the signal strength signal intensity by the amplitude modulation radio set that receives in the air, will form what is called " lid platform " phenomenon this moment, and frequency band range is near the amplitude modulation radio set of switching frequency of D class audio amplifier and can is fully suppressed and can't receive by the electromagnetic radiation of D class audio amplifier.See also Fig. 1, Fig. 1 is that the D class audio amplifier produces the schematic diagram that covers the platform phenomenon.As shown in Figure 1, when the amplitude modulation broadcasting receive frequency of wanting to receive as the user is F3, because 2 subharmonic of the clock signal of D class audio amplifier just drop on the F3, under this kind situation, will cause amplitude modulation broadcasting receive frequency F3 to be covered fully and can't receive.In addition, if when the switching frequency of D class audio amplifier produces the phenomenon of drift, then can cause other wavestrip to broaden so that disturbed amplitude modulation radio set number is more, and cause the user can't receive the problem of amplitude modulation broadcasting.
Therefore, really be necessary to propose a kind of D class audio amplifier that can effectively prevent from disturbing amplitude modulation (AM) broadcast reception, to solve the problem that known technology was faced.
Summary of the invention
Therefore, one of purpose of the present invention is to provide a kind of audio-signal processing apparatus, when avoiding using the D class audio amplifier, disturbs the reception of amplitude modulation (AM) broadcasting, to solve the problem that known technology was faced.
Embodiments of the invention disclose a kind of audio-signal processing apparatus, and it comprises a clock pulse generation module, a processing module, an amplification module and an output module.Time pulse generating module is in order to produce a clock pulse signal.Processing module is coupled to this time pulse generating module, in order to this clock signal is processed, to produce a processing signals.Amplification module is coupled to this processing module, in order to amplification that this processing signals is gained, produces an amplifying signal.Output module is coupled to this amplification module, in order to export this amplifying signal.
Audio-signal processing apparatus of the present invention, wherein this time pulse generating module comprises a clock pulse synthesizer, in order to produce this clock signal.
Audio-signal processing apparatus of the present invention, wherein this time pulse generating module comprises a control interface in addition, is coupled to this clock pulse synthesizer, this control interface is in order to receiving a control signal, and this clock pulse synthesizer produces this clock signal according to this control signal.
Audio-signal processing apparatus of the present invention, wherein this time pulse generating module comprises an analog-digital converter in addition, is coupled to this control interface, this analog-digital converter is in order to being this control signal with a direct current voltage transitions.
Audio-signal processing apparatus of the present invention, wherein this time pulse generating module comprises a quartz (controlled) oscillator in addition, is coupled to this clock pulse synthesizer, in order to produce a reference frequency, this clock pulse synthesizer produces this clock signal according to this reference frequency.
Audio-signal processing apparatus of the present invention, wherein this processing module comprises: a waveform shaping unit in order to this clock signal is carried out shaping, produces a waveform signal; And a level adjustment unit, be coupled to this waveform shaping unit, in order to adjust the level of this waveform signal, produce this processing signals.
Audio-signal processing apparatus of the present invention, wherein this amplification module comprises: one first modulating unit, be coupled to this time pulse generating module and this processing module, in order to according to an input clock signal one audio input signal and this processing signals are processed, produce one first modulation signal; One second modulating unit is coupled to this time pulse generating module and this processing module, in order to according to this input clock signal this audio input signal and this processing signals are processed, produces one second modulation signal; One control switch, the one end optionally is coupled to this first modulating unit and this second modulating unit, in order between this first modulating unit and this second modulating unit, to switch this first modulation signal of corresponding output and this second modulation signal according to a switch controlling signal; And an output-stage circuit, be coupled to the other end of this control switch, in order to amplify this first modulation signal and this second modulation signal, to produce this amplifying signal.
Audio-signal processing apparatus of the present invention, wherein this first modulating unit is certain frequently pulse duration (PWM) modulator.
Audio-signal processing apparatus of the present invention, wherein this second modulating unit is a trigonometric integral pulse duration (Sigma-Delta PWM) modulator.
Audio-signal processing apparatus of the present invention wherein after this control interface reception by this time pulse generating module of this input clock signal, is sent to this first modulating unit and this second modulating unit.
Audio-signal processing apparatus of the present invention, wherein this amplification module is a power amplifier.
Audio-signal processing apparatus of the present invention, wherein this amplification module is a D class audio amplifier.
Audio-signal processing apparatus of the present invention, wherein this output module is a loud speaker.
Audio-signal processing apparatus of the present invention in the time of can avoiding using the D class audio amplifier, disturbs the reception of amplitude modulation (AM) broadcasting and the problem that derives.
Description of drawings
Fig. 1 is that the D class audio amplifier produces the schematic diagram when covering the platform phenomenon.
Figure 2 shows that the schematic diagram of audio-signal processing apparatus proposed by the invention.
Fig. 3 is the schematic diagram of an embodiment of audio-signal processing apparatus of the present invention.
Fig. 4 is the schematic diagram of another embodiment of audio-signal processing apparatus of the present invention.
Fig. 5 is the schematic diagram after the clock signal of audio-signal processing apparatus of the present invention is adjusted.
Embodiment
See also Fig. 2, Figure 2 shows that the schematic diagram of audio-signal processing apparatus proposed by the invention.As shown in Figure 2, the present embodiment discloses a kind of audio-signal processing apparatus 20, and it comprises a clock pulse generation module 22, a processing module 24, an amplification module 26 and an output module 28.Time pulse generating module 22 is in order to produce a clock pulse signal S
CLKProcessing module 24 is coupled to time pulse generating module 22, in order to clock signal S
CLKProcess, to produce a processing signals S
PAmplification module 26 is coupled to processing module 24, in order to this processing signals S
PThe amplification that gains produces an amplifying signal S
AOutput module 28 is coupled to amplification module 26, in order to export amplifying signal S
A
See also Fig. 3 and Fig. 4, Fig. 3 is the schematic diagram of an embodiment of audio-signal processing apparatus of the present invention.Fig. 4 is the schematic diagram of another embodiment of audio-signal processing apparatus of the present invention.Such as Fig. 3 and shown in Figure 4, wherein, time pulse generating module 22 comprises a clock pulse synthesizer 222, in order to produce clock signal S
CLKTime pulse generating module 22 comprises a control interface 224 in addition, is coupled to clock pulse synthesizer 222, and control interface 224 is in order to receive a control signal S
CON, and clock pulse synthesizer 222 is according to this control signal S
CON, produce this clock signal S
CLKWherein, time pulse generating module 22 comprises an analog-digital converter 226 in addition, is coupled to control interface 224, and analog-digital converter 226 is in order to a direct current voltage V
DCBe converted to this control signal S
CONIn addition, in an embodiment, 22 of time pulse generating modules comprise a quartz (controlled) oscillator 228, are coupled to clock pulse synthesizer 222, in order to produce a reference frequency f
REF, clock pulse synthesizer 222 is according to this reference frequency f
REF, produce this clock signal S
CLK
As shown in Figure 3, in the present embodiment, amplification module 26 is a power amplifier.Wherein, this amplification module 26 is a D class audio amplifier.Output module 28 then is a loud speaker, in order to play the amplifying signal S after amplification module 26 gains amplification
A
As shown in Figure 4, in another embodiment, 26 of amplification modules comprise one first modulating unit 262, one second modulating unit 264, a control switch 266 and an output-stage circuit 268.The first modulating unit 262 is coupled to this control interface 224 and the processing module 24 of time pulse generating module 22, in order to input clock signal C according to one
INTo an audio input signal S
AUAnd processing signals S
PProcess, produce one first modulation signal S
1The second modulating unit 264 is coupled to this control interface 224 and the processing module 24 of time pulse generating module 22, in order to input clock signal C according to this
INTo this audio input signal S
AUAnd this processing signals S
PProcess, produce one second modulation signal S
2Wherein, input clock signal C
INAfter these control interface 224 receptions by time pulse generating module 22, be sent to this first modulating unit 262 and this second modulating unit 264.One end of control switch 266 optionally is coupled to the first modulating unit 262 and the second modulating unit 264, in order to according to a switch controlling signal S
SWBetween the first modulating unit 262 and the second modulating unit 264, switch corresponding output the first modulation signal S
1And the second modulation signal S
2Output-stage circuit 268 is coupled to the other end of control switch 266, sees through the first modulation signal S that this control switch 266 produces from the first modulating unit 262 in order to amplify
1And the second modulation signal S of these second modulating unit, 264 generations
2, produce this amplifying signal S
AIn the present embodiment, this first modulating unit 262 is certain frequently pulse-width modulator, and this second modulating unit 264 is a trigonometric integral pulse-width modulator.
Fig. 5 is the schematic diagram after the clock signal of audio-signal processing apparatus of the present invention is adjusted.Below the frequency of the clock signal of explanation change can prevent the principle that the reception of amplitude modulation broadcasting is disturbed by the D class audio amplifier.As shown in Figure 5, after the frequency of clock pulse signal is adjusted by audio-signal processing apparatus of the present invention, 2 subharmonic of the clock signal of D class audio amplifier stagger with amplitude modulation broadcasting receive frequency F3, so the signal of amplitude modulation broadcasting receive frequency F3 just can be received by clear, and can not occur as lid platform phenomenon shown in Figure 1 in the known technology.In addition, because amplitude modulation broadcasting receive frequency F3 must all keep differing more than the 20KHz with clock signal and 2 subharmonic of D class audio amplifier, audio-signal processing apparatus of the present invention is designed to finely tune the clock signal of D class audio amplifier, so can guarantee better service behaviour.
In each embodiment of the present invention, audio-signal processing apparatus utilizes time pulse generating module to produce clock signal according to the application feature of reality, again according to clock signal further to the audio input signal amplification that gains, produce final amplifying signal, play by loud speaker, in the time of so can avoiding using the D class audio amplifier, disturb the reception of amplitude modulation (AM) broadcasting and the problem that derives.
The above only is preferred embodiment of the present invention; so it is not to limit scope of the present invention; any personnel that are familiar with the technology; without departing from the spirit and scope of the present invention; can do on this basis further improvement and variation, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
20: the sound signal processing module
22: time pulse generating module
24: processing module
26: amplification module
28: output module
222: the clock pulse synthesizer
224: control interface
226: analog-digital converter
228: quartz (controlled) oscillator
242: the waveform shaping unit
244: the level adjustment unit
262: the first modulating units
264: the second modulating units
266: control switch
268: output-stage circuit
S
CLK: clock signal
S
WAV: waveform signal
S
P: processing signals
S
A: amplifying signal
S
AU: audio input signal
C
IN: the input clock signal
S
SW: switch controlling signal
S
1: the first modulation signal
S
2: the second modulation signal
F1～F7: amplitude modulation broadcasting receive frequency
Claims (8)
1. an audio-signal processing apparatus is characterized in that, comprising:
One clock pulse generation module is in order to produce a clock pulse signal;
One processing module is coupled to this time pulse generating module, in order to this clock signal is processed, to produce a processing signals;
One amplification module is coupled to this processing module, in order to amplification that this processing signals is gained, to produce an amplifying signal; And
One output module is coupled to this amplification module, in order to exporting this amplifying signal,
Wherein, this time pulse generating module comprises:
One clock pulse synthesizer is in order to produce this clock signal;
One control interface is coupled to this clock pulse synthesizer, and this control interface is in order to receiving a control signal, and this clock pulse synthesizer produces this clock signal according to this control signal;
One analog-digital converter is coupled to this control interface, and this analog-digital converter is in order to being this control signal with a direct current voltage transitions; And
One quartz (controlled) oscillator is coupled to this clock pulse synthesizer, and in order to produce a reference frequency, this clock pulse synthesizer produces this clock signal according to this reference frequency;
Wherein, this processing module comprises:
One waveform shaping unit in order to this clock signal is carried out shaping, produces a waveform signal; And
One level adjustment unit is coupled to this waveform shaping unit, in order to adjust the level of this waveform signal, produces this processing signals.
2. audio-signal processing apparatus according to claim 1 is characterized in that, this amplification module comprises:
One first modulating unit is coupled to this time pulse generating module and this processing module, in order to according to an input clock signal one audio input signal and this processing signals are processed, produces one first modulation signal;
One second modulating unit is coupled to this time pulse generating module and this processing module, in order to according to this input clock signal this audio input signal and this processing signals are processed, produces one second modulation signal;
One control switch, the one end optionally is coupled to this first modulating unit and this second modulating unit, in order between this first modulating unit and this second modulating unit, to switch this first modulation signal of corresponding output and this second modulation signal according to a switch controlling signal; And
One output-stage circuit is coupled to the other end of this control switch, in order to amplify this first modulation signal and this second modulation signal, to produce this amplifying signal.
3. audio-signal processing apparatus according to claim 2 is characterized in that, this first modulating unit is certain frequently pulse-width modulator.
4. audio-signal processing apparatus according to claim 2 is characterized in that, this second modulating unit is a trigonometric integral pulse-width modulator.
5. audio-signal processing apparatus according to claim 2 is characterized in that, after this control interface reception by this time pulse generating module of this input clock signal, is sent to this first modulating unit and this second modulating unit.
6. audio-signal processing apparatus according to claim 1 is characterized in that, this amplification module is a power amplifier.
7. audio-signal processing apparatus according to claim 1 is characterized in that, this amplification module is a D class audio amplifier.
8. audio-signal processing apparatus according to claim 1 is characterized in that, this output module is a loud speaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710140672 CN101399559B (en) | 2007-09-28 | 2007-09-28 | Sound signal processing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710140672 CN101399559B (en) | 2007-09-28 | 2007-09-28 | Sound signal processing device |
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| Publication Number | Publication Date |
|---|---|
| CN101399559A CN101399559A (en) | 2009-04-01 |
| CN101399559B true CN101399559B (en) | 2013-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710140672 Active CN101399559B (en) | 2007-09-28 | 2007-09-28 | Sound signal processing device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102811039B (en) * | 2012-07-27 | 2016-01-06 | 瑞声声学科技(深圳)有限公司 | Pulse width modulation device and modulator approach |
| CN104077862A (en) * | 2013-03-29 | 2014-10-01 | 北京谊安医疗系统股份有限公司 | Medical alarm circuit device and method |
| CN103780996B (en) * | 2014-02-20 | 2018-10-02 | 深圳市京泉华科技股份有限公司 | It is a kind of to eliminate circuit of the Switching Power Supply to the sound equipment AM noises generated |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267955A (en) * | 1998-12-22 | 2000-09-27 | 英特赛尔公司 | Double-mode grade D amplifier |
| WO2005081449A1 (en) * | 2004-02-02 | 2005-09-01 | Thomson Licensing S.A. | Analog to digital converter clock synchronizer |
| CN1717863A (en) * | 2002-11-27 | 2006-01-04 | 印芬龙科技股份有限公司 | Method and device for correcting signal distortions in an amplifier device |
| CN1853344A (en) * | 2003-07-17 | 2006-10-25 | Ess技术公司 | Device and method for signal processing |
-
2007
- 2007-09-28 CN CN 200710140672 patent/CN101399559B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267955A (en) * | 1998-12-22 | 2000-09-27 | 英特赛尔公司 | Double-mode grade D amplifier |
| CN1717863A (en) * | 2002-11-27 | 2006-01-04 | 印芬龙科技股份有限公司 | Method and device for correcting signal distortions in an amplifier device |
| CN1853344A (en) * | 2003-07-17 | 2006-10-25 | Ess技术公司 | Device and method for signal processing |
| WO2005081449A1 (en) * | 2004-02-02 | 2005-09-01 | Thomson Licensing S.A. | Analog to digital converter clock synchronizer |
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| CN101399559A (en) | 2009-04-01 |
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