CN102905212A - Anti-sonic boom display device and audio signal processing device - Google Patents
Anti-sonic boom display device and audio signal processing device Download PDFInfo
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- CN102905212A CN102905212A CN201110208559XA CN201110208559A CN102905212A CN 102905212 A CN102905212 A CN 102905212A CN 201110208559X A CN201110208559X A CN 201110208559XA CN 201110208559 A CN201110208559 A CN 201110208559A CN 102905212 A CN102905212 A CN 102905212A
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Abstract
The invention discloses an audio signal processing device. The audio signal processing device is electrically connected between a multimedia processor and an alternating current-direct current converter, wherein the alternating current-direct current converter uses a power supply switch to receive alternating current voltage and convert the alternating current voltage to direct current voltage; and the audio signal processing device comprises an audio signal amplifier, a left audio track capacitor, a right audio track capacitor, a left audio track sound source output device, a right audio track sound source output device and an anti-sonic boom module. When the power supply switch is in a conduction state, the audio signal amplifier is used for receiving a sound source signal from the multimedia processor and amplifying the sound source signal so as to obtain a left audio track current signal and a right audio track current signal; the left and right audio track capacitors are respectively provided with a first end electrically connected with the audio signal amplifier and a second end; and the anti-sonic boom module is used for detecting whether the direct current voltage is lower than reference voltage or not so as to enable the second ends of the left and right audio track capacitors to be switched between a power-on state and a power-off state between the left and right audio track sound source output devices, and if so, the power-off state exists.
Description
Technical field
The present invention relates to a kind of display device, device, refer to especially a kind of display device, message processing unit of anti-sonic boom.
Background technology
As shown in Figure 1, be a kind of display device in the past, applicable be electrically connected on an AC power AC that an alternating voltage is provided, and this display device comprises: a multimedia processor 10, a mains switch 11, an AC/DC changeover switch 12, and a message processing unit 13.
This multimedia processor 10 is used for providing a sound source signal.
This mains switch 11 has one and is electrically connected on this AC power AC to receive the first end of this alternating voltage, reach one second end, and controlled its first and second end that makes switches between conducting state and not on-state.
This AC/DC changeover switch 12 is electrically connected on the second end of this mains switch 11, when this mains switch 11 is in conducting state, receives this alternating voltage via this mains switch 11 from this AC power AC, and carries out according to this AC-DC conversion to obtain a direct current voltage.
L channel capacitor C L and the L channel sound source follower L of series connection are electrically connected on this audio amplifier 131, when this mains switch 11 is in conducting state in order to receive this L channel current signal, this L channel capacitor C L is charged to obtain a stored voltage by this L channel current signal, and L channel sound source follower L then converts this L channel current signal to a L channel acoustic signals with outside transmission.
R channel capacitor C R and the R channel sound source follower R of series connection are electrically connected on this audio amplifier 131, when this mains switch 11 is in conducting state in order to receive this R channel current signal, this R channel capacitor C R is charged to obtain a stored voltage by this R channel current signal, and R channel sound source follower R then converts this R channel current signal to a R channel acoustic signals with outside transmission.This left and right sound channels sound source follower L, R can be loudspeaker or earphone, and can equivalence be a load resistance Rout.
But display device in the past has following shortcoming:
When this mains switch 11 transfers not on-state to by conducting state, it is that this left and right sound channels sound source follower L, the R of load resistance Rout flows to ground to discharge via equivalence that stored voltage on this left and right sound channels capacitor C L, the CR provides respectively a burst current, to cause this left and right sound channels sound source follower L, R to produce the sonic boom phenomenon, and make people's ear uncomfortable.
Summary of the invention
The first purpose of the present invention is namely providing a kind of display device of anti-sonic boom.
The present invention should prevent the display device of sonic boom, is electrically connected on one the AC power of an alternating voltage is provided, and comprise:
One multimedia processor is used for providing a sound source signal;
One mains switch has one and is electrically connected on this AC power to receive the first end of this alternating voltage, reach one second end, and controlled its first and second end that makes switches between conducting state and not on-state;
One AC/DC changeover switch is electrically connected on the second end of this mains switch, when this mains switch is in conducting state, receives this alternating voltage via this mains switch from this AC power, and carries out according to this AC-DC conversion to obtain a direct current voltage; And
One message processing unit comprises:
One audio amplifier, be electrically connected on this multimedia processor and this AC/DC changeover switch, when this mains switch is in conducting state, this audio amplifier receives this direct voltage as working bias voltage from this AC/DC changeover switch, and receives this sound source signal and amplify according to this to obtain a L channel current signal and a R channel current signal from this multimedia processor;
Left and right sound channels electric capacity has respectively a first end that is electrically connected on this audio amplifier, and one second end;
The left and right sound channels sound source follower, the electric current that is respectively applied to receive transfers the left and right sound channels acoustic signals to; And
One anti-sonic boom module, be electrically connected on the second end, this left and right sound channels sound source follower of this AC/DC changeover switch, this left and right sound channels electric capacity, and whether detecting is lower than a reference voltage from this direct voltage of this AC/DC changeover switch, the second end that makes this left and right sound channels electric capacity respectively and switch on a "on" position and an off-position between this left and right sound channels sound source follower, if then be this off-position.
Preferably, this anti-sonic boom module has:
One voltage detector receives this reference voltage and is electrically connected on this AC/DC changeover switch, and whether detecting be lower than this reference voltage from this direct voltage of this AC/DC changeover switch, and exports one in the control signal of high and low level translation;
One L channel switch, have a first end, that is electrically connected on the second end of this L channel electric capacity and be electrically connected on the second end of this L channel sound source follower, and one be electrically connected on this voltage detector receiving the control end of this control signal, and in high and low level translation its first and second end is switched according to this control signal between conducting and not conducting; And
One R channel switch, have a first end, that is electrically connected on the second end of this R channel electric capacity and be electrically connected on the second end of this R channel sound source follower, and one be electrically connected on this voltage detector receiving the control end of this control signal, and in high and low level translation its first and second end is switched according to this control signal between conducting and not conducting.
Preferably, this voltage detector has:
One operation amplifier unit, have a non-inverting input, that receives this reference voltage and be electrically connected on this AC/DC changeover switch to receive the inverting input of this direct voltage, and one provide one in the output of the comparison signal of high and low level translation, whether this operation amplifier unit relatively this direct voltage and makes this comparison signal be in high level or low level less than this reference voltage according to this;
One resistance has one and is electrically connected on this AC/DC changeover switch to receive the first end of this direct voltage, reaches one second end; And
One transistor, having one is electrically connected on the second end of this resistance and the first end of this control signal, the second end of a ground connection is provided, and one the output that is electrically connected on this operation amplifier unit receiving the control end of this comparison signal, and according to the control of this comparison signal its first and second end is switched between conducting and the not conducting;
When this mains switch transfers not conducting to, and when causing this direct voltage to be lower than this reference voltage, the comparison signal that this high level is exported in this operation amplifier unit makes this transistor turns, and this control signal is pulled down to low level, makes this not conducting of left and right sound channels switch.
Preferably, when this mains switch transfers conducting to, and when causing this direct voltage to be higher than this reference voltage, this operation amplifier unit this low level comparison signal of output makes this not conducting of transistor, and this resistance is pulled to high level with this control signal, make this left and right sound channels switch conduction, be converted to the left and right sound channels acoustic signals and make this left and right sound channels current signal from this audio amplifier flow to respectively this left and right sound channels sound source follower, and this left and right sound channels current signal charges to this left and right sound channels electric capacity more respectively.
Preferably, this reference voltage is a Digital reference value, and this voltage detector has:
One analog digital converting unit is electrically connected on this AC/DC changeover switch receiving this direct voltage, and with this direct voltage simulate to digital translation to obtain a digital detecting value; And
One logical block receives this Digital reference value and is electrically connected on this analog digital converting unit receiving this numeral detecting value, and relatively should numeral detecting value whether less than this Digital reference value, come the high and low level of this control signal of conversion;
When this mains switch transfers not conducting to, and when causing this numeral detecting value less than this Digital reference value, this control signal is in low level, and makes this not conducting of left and right sound channels switch.
Preferably, when this mains switch transfers conducting to, and when causing this numeral detecting value greater than this Digital reference value, this control signal is at high level, and make this left and right sound channels switch conduction, flow to respectively this left and right sound channels sound source follower from this left and right sound channels current signal of this audio amplifier and be converted to the left and right sound channels acoustic signals, and this left and right sound channels current signal charges to this left and right sound channels electric capacity more respectively.
The second purpose of the present invention is namely providing a kind of message processing unit.
This message processing unit of the present invention, being electrically connected on one provides between the multimedia processor and an AC/DC changeover switch of a sound source signal, this AC/DC changeover switch is connected to an AC power that an alternating voltage is provided via a mains switch, when this mains switch is in conducting state, this AC/DC changeover switch receives this alternating voltage via this mains switch from this AC power, and carry out according to this AC-DC conversion obtaining a direct current voltage, and this message processing unit comprises:
One audio amplifier, be electrically connected on this multimedia processor and this AC/DC changeover switch, when this mains switch is in conducting state, this audio amplifier receives this direct voltage as working bias voltage from this AC/DC changeover switch, and receives this sound source signal and amplify according to this to obtain a L channel current signal and a R channel current signal from this multimedia processor;
Left and right sound channels electric capacity has respectively a first end that is electrically connected on this audio amplifier, and one second end;
The left and right sound channels sound source follower, the electric current that is respectively applied to receive transfers the left and right sound channels acoustic signals to; And
One anti-sonic boom module, be electrically connected on the second end, this left and right sound channels sound source follower of this AC/DC changeover switch, this left and right sound channels electric capacity, and whether detecting is lower than a reference voltage from this direct voltage of this AC/DC changeover switch, the second end that makes this left and right sound channels electric capacity respectively and switch on a "on" position and an off-position between this left and right sound channels sound source follower, if then be this off-position.
Beneficial effect of the present invention is: when mains switch transfers not conducting to, make the second end of left and right sound channels electric capacity switch to off-position respectively and between the left and right sound channels sound source follower by anti-sonic boom module, prevent that the discharge of left and right sound channels electric capacity from causing this left and right sound channels sound source follower output sonic boom.
Description of drawings
Fig. 1 is a kind of circuit block diagram of display device in the past;
Fig. 2 is the circuit block diagram of the first preferred embodiment of the display device of the anti-sonic boom of the present invention;
Fig. 3 is the circuit block diagram of the second preferred embodiment of the display device of the anti-sonic boom of the present invention.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
As shown in Figure 2, the first preferred embodiment of the display device of the anti-sonic boom of the present invention, the applicable AC power AC that an alternating voltage is provided that is electrically connected on, and display device that should anti-sonic boom comprises a multimedia processor 2, a mains switch S, an AC/DC changeover switch 3, and a message processing unit 4.
This multimedia processor 2 is used for providing a sound source signal.
This mains switch S has one and is electrically connected on this AC power AC to receive the first end of this alternating voltage, reaches one second end, and controlled its first and second end that makes switches to transmit or do not transmit this alternating voltage between conducting state and not on-state.
This AC/DC changeover switch 3 is electrically connected on the second end of this mains switch S, when this mains switch S is in conducting state, receives this alternating voltage via this mains switch S from this AC power AC, and carries out according to this AC-DC conversion to obtain a direct current voltage.
Left and right sound channels capacitor C L, CR have a first end that is electrically connected on this audio amplifier 40 separately, and one second end.
The electric current that left and right sound channels sound source follower L, R are respectively applied to receive transfers the left and right sound channels acoustic signals to.
This operation amplifier unit OP has a non-inverting input (+), that receives this reference voltage Vref and is electrically connected on this AC/DC changeover switch 3 to receive the inverting input (-) of this direct voltage Vd, and one provide one in the output of the comparison signal of high and low level translation, whether this operation amplifier unit OP relatively this direct voltage Vd and makes this comparison signal be in high level or low level less than this reference voltage Vref according to this.
This resistance R has one and is electrically connected on this AC/DC changeover switch 3 to receive the first end of this direct voltage Vd, reaches one second end.
This transistor M has one and is electrically connected on the second end of this resistance R and the first end of this control signal Vc, the second end of a ground connection are provided, and one the output that is electrically connected on this operation amplifier unit OP receiving the control end of this comparison signal, and according to the control of this comparison signal its first and second end is switched between conducting and not conducting.
This L channel switch S L has the second end that a first end, that is electrically connected on the second end of this L channel capacitor C L is electrically connected on this L channel sound source follower L, and one be electrically connected on this voltage detector 42 receiving the control end of this control signal Vc, and in high and low level translation its first and second end is switched according to this control signal Vc between conducting and not conducting.
This R channel switch S R has the second end that a first end, that is electrically connected on the second end of this R channel capacitor C R is electrically connected on this R channel sound source follower R, and one be electrically connected on this voltage detector 42 receiving the control end of this control signal Vc, and in high and low level translation its first and second end is switched according to this control signal Vc between conducting and not conducting.
S transfers conducting to when this mains switch, and when causing this direct voltage Vd to be higher than this reference voltage Vref, this low level comparison signal of this operation amplifier unit OP output makes not conducting of this transistor M, and this resistance R is pulled to high level with this control signal Vc, make this left side, R channel switch S L, the SR conducting, and make this left side from this audio amplifier 40, R channel current signal IL, IR flows to respectively this left side, R channel sound source follower L, R is converted to a left side, the R channel acoustic signals outwards transmits, and should a left side, R channel current signal IL, IR is more respectively to this left side, R channel capacitor C L, CR charges.
S transfers not conducting to when this mains switch, and when causing this direct voltage Vd to be lower than this reference voltage Vref, the comparison signal that this operation amplifier unit OP exports this high level makes this transistor M conducting, and this control signal Vc is pulled down to low level, make this left and right sound channels switch S L, not conducting of SR, therefore, this left and right sound channels capacitor C L, CR can not provide this left and right sound channels sound source follower of current direction L, R, just can not produce sonic boom yet.
As shown in Figure 3, the second preferred embodiment of the display device of the anti-sonic boom of the present invention, with the difference of the first preferred embodiment be: this voltage detector 42 has an analog digital converting unit ADC, and a logical block LU.
This analog digital converting unit ADC is electrically connected on this AC/DC changeover switch 3 receiving this direct voltage Vd, and with this direct voltage Vd simulate to digital translation to obtain a digital detecting value.
This reference voltage is a Digital reference value again, and this logical block LU receives this Digital reference value and is electrically connected on this analog digital converting unit ADC to receive this numeral detecting value, and relatively should numeral detecting value whether less than this Digital reference value, come the high and low level of this control signal of conversion Vc.
S transfers conducting to when this mains switch, and when causing this numeral detecting value greater than this Digital reference value, Vc is at high level for this control signal, and make this left and right sound channels switch S L, SR conducting, therefore, flow to respectively this left and right sound channels sound source follower L, R from this left and right sound channels current signal IL, the IR of this audio amplifier 40 and be converted to the left and right sound channels acoustic signals and outwards transmit, and this left and right sound channels current signal IL, IR charge to this left and right sound channels capacitor C L, CR more respectively.
S transfers not conducting to when this mains switch, and when causing this numeral detecting value less than this Digital reference value, Vc is in low level for this control signal, and make this not conducting of left and right sound channels switch S, therefore, this left and right sound channels capacitor C L, CR can not provide this left and right sound channels sound source follower of current direction L, R, just can not produce sonic boom yet.
In sum, above-described embodiment has the following advantages:
1. work as this mains switch S and transfer not conducting to, make the second end of this left and right sound channels capacitor C L, CR switch to off-position respectively and between this left and right sound channels sound source follower L, R by anti-sonic boom module 41, prevent that the discharge of left and right sound channels capacitor C L, CR from causing this left and right sound channels sound source follower L, R to export sonic boom.
2. the second embodiment utilizes digital detecting to be worth to compare, and can improve the ability of anti-noise jamming.
But the above person only is preferred embodiment of the present invention, and when not limiting scope of the invention process with this, i.e. all simple equivalences of doing according to claims of the present invention and description change and modify, and all still belong to the scope of the invention.
Claims (12)
1. the display device of an anti-sonic boom is electrically connected on one the AC power of an alternating voltage is provided, and it is characterized in that: comprises:
One multimedia processor is used for providing a sound source signal;
One mains switch has one and is electrically connected on this AC power to receive the first end of this alternating voltage, reach one second end, and controlled its first and second end that makes switches between conducting state and not on-state;
One AC/DC changeover switch is electrically connected on the second end of this mains switch, when this mains switch is in conducting state, receives this alternating voltage via this mains switch from this AC power, and carries out according to this AC-DC conversion to obtain a direct current voltage; And
One message processing unit comprises:
One audio amplifier, be electrically connected on this multimedia processor and this AC/DC changeover switch, when this mains switch is in conducting state, this audio amplifier receives this direct voltage as working bias voltage from this AC/DC changeover switch, and receives this sound source signal and amplify according to this to obtain a L channel current signal and a R channel current signal from this multimedia processor;
Left and right sound channels electric capacity has respectively a first end that is electrically connected on this audio amplifier, and one second end;
The left and right sound channels sound source follower, the electric current that is respectively applied to receive transfers the left and right sound channels acoustic signals to; And
One anti-sonic boom module, be electrically connected on the second end, this left and right sound channels sound source follower of this AC/DC changeover switch, this left and right sound channels electric capacity, and whether detecting is lower than a reference voltage from this direct voltage of this AC/DC changeover switch, the second end that makes this left and right sound channels electric capacity respectively and switch on a "on" position and an off-position between this left and right sound channels sound source follower, if then be this off-position.
2. the display device of anti-sonic boom according to claim 1, it is characterized in that: this anti-sonic boom module has:
One voltage detector receives this reference voltage and is electrically connected on this AC/DC changeover switch, and whether detecting be lower than this reference voltage from this direct voltage of this AC/DC changeover switch, and exports one in the control signal of high and low level translation;
One L channel switch, have a first end, that is electrically connected on the second end of this L channel electric capacity and be electrically connected on the second end of this L channel sound source follower, and one be electrically connected on this voltage detector receiving the control end of this control signal, and in high and low level translation its first and second end is switched according to this control signal between conducting and not conducting; And
One R channel switch, have a first end, that is electrically connected on the second end of this R channel electric capacity and be electrically connected on the second end of this R channel sound source follower, and one be electrically connected on this voltage detector receiving the control end of this control signal, and in high and low level translation its first and second end is switched according to this control signal between conducting and not conducting.
3. the display device of anti-sonic boom according to claim 2, it is characterized in that: this voltage detector has:
One operation amplifier unit, have a non-inverting input, that receives this reference voltage and be electrically connected on this AC/DC changeover switch to receive the inverting input of this direct voltage, and one provide one in the output of the comparison signal of high and low level translation, whether this operation amplifier unit relatively this direct voltage and makes this comparison signal be in high level or low level less than this reference voltage according to this;
One resistance has one and is electrically connected on this AC/DC changeover switch to receive the first end of this direct voltage, reaches one second end; And
One transistor, having one is electrically connected on the second end of this resistance and the first end of this control signal, the second end of a ground connection is provided, and one the output that is electrically connected on this operation amplifier unit receiving the control end of this comparison signal, and according to the control of this comparison signal its first and second end is switched between conducting and the not conducting;
When this mains switch transfers not conducting to, and when causing this direct voltage to be lower than this reference voltage, the comparison signal that this high level is exported in this operation amplifier unit makes this transistor turns, and this control signal is pulled down to low level, makes this not conducting of left and right sound channels switch.
4. the display device of anti-sonic boom according to claim 3 is characterized in that:
When this mains switch transfers conducting to, and when causing this direct voltage to be higher than this reference voltage, this operation amplifier unit this low level comparison signal of output makes this not conducting of transistor, and this resistance is pulled to high level with this control signal, make this left and right sound channels switch conduction, be converted to the left and right sound channels acoustic signals and make this left and right sound channels current signal from this audio amplifier flow to respectively this left and right sound channels sound source follower, and this left and right sound channels current signal charges to this left and right sound channels electric capacity more respectively.
5. the display device of anti-sonic boom according to claim 2, it is characterized in that: this reference voltage is a Digital reference value, and this voltage detector has:
One analog digital converting unit is electrically connected on this AC/DC changeover switch receiving this direct voltage, and with this direct voltage simulate to digital translation to obtain a digital detecting value; And
One logical block receives this Digital reference value and is electrically connected on this analog digital converting unit receiving this numeral detecting value, and relatively should numeral detecting value whether less than this Digital reference value, come the high and low level of this control signal of conversion;
When this mains switch transfers not conducting to, and when causing this numeral detecting value less than this Digital reference value, this control signal is in low level, and makes this not conducting of left and right sound channels switch.
6. the display device of anti-sonic boom according to claim 5 is characterized in that:
When this mains switch transfers conducting to, and when causing this numeral detecting value greater than this Digital reference value, this control signal is at high level, and make this left and right sound channels switch conduction, flow to respectively this left and right sound channels sound source follower from this left and right sound channels current signal of this audio amplifier and be converted to the left and right sound channels acoustic signals, and this left and right sound channels current signal charges to this left and right sound channels electric capacity more respectively.
7. message processing unit, being electrically connected on one provides between the multimedia processor and an AC/DC changeover switch of a sound source signal, this AC/DC changeover switch is connected to an AC power that an alternating voltage is provided via a mains switch, when this mains switch is in conducting state, this AC/DC changeover switch receives this alternating voltage via this mains switch from this AC power, and carry out according to this AC-DC conversion obtaining a direct current voltage, and it is characterized in that: this message processing unit comprises:
One audio amplifier, be electrically connected on this multimedia processor and this AC/DC changeover switch, when this mains switch is in conducting state, this audio amplifier receives this direct voltage as working bias voltage from this AC/DC changeover switch, and receives this sound source signal and amplify according to this to obtain a L channel current signal and a R channel current signal from this multimedia processor;
Left and right sound channels electric capacity has respectively a first end that is electrically connected on this audio amplifier, and one second end;
The left and right sound channels sound source follower, the electric current that is respectively applied to receive transfers the left and right sound channels acoustic signals to; And
One anti-sonic boom module, be electrically connected on the second end, this left and right sound channels sound source follower of this AC/DC changeover switch, this left and right sound channels electric capacity, and whether detecting is lower than a reference voltage from this direct voltage of this AC/DC changeover switch, the second end that makes this left and right sound channels electric capacity respectively and switch on a "on" position and an off-position between this left and right sound channels sound source follower, if then be this off-position.
8. message processing unit according to claim 7, it is characterized in that: this anti-sonic boom module has:
One voltage detector receives this reference voltage and is electrically connected on this AC/DC changeover switch, and whether detecting be lower than this reference voltage from this direct voltage of this AC/DC changeover switch, and exports one in the control signal of high and low level translation;
One L channel switch, have a first end, that is electrically connected on the second end of this L channel electric capacity and be electrically connected on the second end of this L channel sound source follower, and one be electrically connected on this voltage detector receiving the control end of this control signal, and in high and low level translation its first and second end is switched according to this control signal between conducting and not conducting; And
One R channel switch, have a first end, that is electrically connected on the second end of this R channel electric capacity and be electrically connected on the second end of this R channel sound source follower, and one be electrically connected on this voltage detector receiving the control end of this control signal, and in high and low level translation its first and second end is switched according to this control signal between conducting and not conducting.
9. message processing unit according to claim 8, it is characterized in that: this voltage detector has:
One operation amplifier unit, have a non-inverting input, that receives this reference voltage and be electrically connected on this AC/DC changeover switch to receive the inverting input of this direct voltage, and one provide one in the output of the comparison signal of high and low level translation, whether this operation amplifier unit relatively this direct voltage and makes this comparison signal be in high level or low level less than this reference voltage according to this;
One resistance has one and is electrically connected on this AC/DC changeover switch to receive the first end of this direct voltage, reaches one second end; And
One transistor, having one is electrically connected on the second end of this resistance and the first end of this control signal, the second end of a ground connection is provided, and one the output that is electrically connected on this operation amplifier unit receiving the control end of this comparison signal, and according to the control of this comparison signal its first and second end is switched between conducting and not conducting;
When this mains switch transfers not conducting to, and when causing this direct voltage to be lower than this reference voltage, the comparison signal that this high level is exported in this operation amplifier unit makes this transistor turns, and this control signal is pulled down to low level, makes this not conducting of left and right sound channels switch.
10. message processing unit according to claim 9 is characterized in that:
When this mains switch transfers conducting to, and when causing this direct voltage to be higher than this reference voltage, this operation amplifier unit this low level comparison signal of output makes this not conducting of transistor, and this resistance is pulled to high level with this control signal, make this left and right sound channels switch conduction, be converted to the left and right sound channels acoustic signals and make this left and right sound channels current signal from this audio amplifier flow to respectively this left and right sound channels sound source follower, and this left and right sound channels current signal charges to this left and right sound channels electric capacity more respectively.
11. message processing unit according to claim 8 is characterized in that: this reference voltage is a Digital reference value, and this voltage detector has:
One analog digital converting unit is electrically connected on this AC/DC changeover switch receiving this direct voltage, and with this direct voltage simulate to digital translation to obtain a digital detecting value; And
One logical block receives this Digital reference value and is electrically connected on this analog digital converting unit receiving this numeral detecting value, and relatively should numeral detecting value whether less than this Digital reference value, come the high and low level of this control signal of conversion;
When this mains switch transfers not conducting to, and when causing this numeral detecting value less than this Digital reference value, this control signal is in low level, and makes this not conducting of left and right sound channels switch.
12. message processing unit according to claim 11 is characterized in that:
When this mains switch transfers conducting to, and when causing this numeral detecting value greater than this Digital reference value, this control signal is at high level, and make this left and right sound channels switch conduction, flow to respectively this left and right sound channels sound source follower from this left and right sound channels current signal of this audio amplifier and be converted to the left and right sound channels acoustic signals, and this left and right sound channels current signal charges to this left and right sound channels electric capacity more respectively.
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| CN201110208559XA CN102905212A (en) | 2011-07-25 | 2011-07-25 | Anti-sonic boom display device and audio signal processing device |
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| CN201110208559XA CN102905212A (en) | 2011-07-25 | 2011-07-25 | Anti-sonic boom display device and audio signal processing device |
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| CN104093104A (en) * | 2014-07-10 | 2014-10-08 | 深圳市中兴移动通信有限公司 | Circuit and method for eliminating POP sound of earphone |
| CN104698393A (en) * | 2013-12-05 | 2015-06-10 | 惠州市德赛西威汽车电子有限公司 | Power detector with automatic muting function and vehicle-borne audio-visual system |
| TWI807983B (en) * | 2022-09-01 | 2023-07-01 | 國立成功大學 | Ear canal device for electric signal detection, audio detection, and masking audio generation |
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| CN104093104A (en) * | 2014-07-10 | 2014-10-08 | 深圳市中兴移动通信有限公司 | Circuit and method for eliminating POP sound of earphone |
| TWI807983B (en) * | 2022-09-01 | 2023-07-01 | 國立成功大學 | Ear canal device for electric signal detection, audio detection, and masking audio generation |
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Application publication date: 20130130 |