CN103414071A - Audio signal receiving and switching device - Google Patents
Audio signal receiving and switching device Download PDFInfo
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- CN103414071A CN103414071A CN2013103207451A CN201310320745A CN103414071A CN 103414071 A CN103414071 A CN 103414071A CN 2013103207451 A CN2013103207451 A CN 2013103207451A CN 201310320745 A CN201310320745 A CN 201310320745A CN 103414071 A CN103414071 A CN 103414071A
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Abstract
The invention discloses an audio signal switching device which comprises an input interface and a USB output interface. The audio signal switching device further comprises a boosting unit and a signal amplifier. The input interface is a headphone jack and comprises a first audio signal input pin. The first audio signal input pin is used for receiving an audio signal sent by an audio signal sending device connected with the first audio signal input pin, and outputting the audio signal to the input end of the boosting unit. The USB output interface comprises an audio signal output pin. The boosting unit is used for boosting the audio signal input by the input end of the boosting unit and outputting the boosted audio signal to the signal amplifier through the output end of the boosting unit. The signal amplifier is connected with the output end of the boosting unit and the audio signal output pin of the USB output interface to be used for outputting the amplified audio signal. The audio signal output pin is a D+ pin or a D- pin in the USB output interface.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of audio signal receiving system and audio signal switching device.
Background technology
Along with the development of audio-frequency signal coding/decoding technique, the electronic installation that transmits data by audio interface is more and more.For example, the low-resistance voice coil type horn interface (for example, earphone interface) that electronic installation can pass through mobile communications device (for example, mobile phone) is connected with mobile communications device, receives the audio signal of mobile communications device output.
Because the power output of low-resistance voice coil type horn interface is very little, except the very little electronic installation of power consumption (as earphone), electronic installation by low-resistance voice coil type horn interface received audio signal need to use external power supply or built-in battery to work usually, increase the cost of electronic installation, increased the volume of electronic installation.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the deficiencies in the prior art, and a kind of audio signal switching device of audio signal of exportable amplification is provided, and the audio signal receiving system be connected with this switching device.
In order to address the above problem, the invention provides a kind of audio signal switching device, comprise: input interface, USB output interface; In described audio signal switching device, also comprise: boosting unit and signal amplifier; Wherein:
Described input interface is earphone interface, wherein said input interface comprises the first audio signal input pin, the audio signal that described the first audio signal input pin sends for receiving coupled audio signal dispensing device, and export it input of described boosting unit to;
Described USB output interface comprises the audio signal output pin;
Described boosting unit, for the audio signal to its input input, boost, and the audio signal after boosting by its output exports described signal amplifier to;
Described signal amplifier, be connected with the output of described boosting unit, and be connected with the audio signal output pin of described USB output interface, be used to exporting the audio signal after amplification;
Wherein said audio signal output pin is D+ pin or the D-pin in the USB output interface.
In addition, described boosting unit is step-up transformer, and described step-up transformer comprises primary coil and secondary coil;
A pin of described primary coil is connected with described the first audio signal input pin as the input of described boosting unit, another pin ground connection of described primary coil;
At least one output pin of described secondary coil is connected with the input of described rectification unit as the output of described boosting unit, the tap ground connection of described secondary coil.
In addition, in described audio signal switching device, also comprise rectification unit and filter unit, wherein:
Described rectification unit, carry out rectification for the audio signal to after the boosting of its input input, and by its output, export the level obtained after rectification the input of described filter unit to;
Described filter unit, carry out filtering for the level to its input input, and by its output, export the DC level obtained after filtering the VBUS pin of described USB output interface to.
In addition, in described input interface, also comprise Mike's pin;
When described audio signal output pin was the D+ pin in the USB output interface, described Mike's pin was connected with the D-pin of described USB output interface;
Described D-pin is used for receiving signal, and by described Mike's pin output.
In addition, in described input interface, also comprise Mike's pin;
When described audio signal output pin was the D-pin in the USB output interface, described Mike's pin was connected with the D+ pin of described USB output interface;
Described D+ pin is used for receiving signal, and by described Mike's pin output.
In addition, in described rectification unit, comprise at least one diode, the positive pole of described diode is connected with the input of described rectification unit, and the negative pole of described diode is connected with the output of described rectification unit.
In addition, the secondary coil of described step-up transformer comprises two output pins; The input of described rectification unit comprises two input pins;
Two output pins of described secondary coil are connected with two input pins of described rectification unit respectively;
In described rectification unit, comprise two diodes, the positive pole of described two diodes is connected with two input pins of described rectification unit respectively.
In addition, in described filter unit, comprise capacitor;
One end of described capacitor is connected with input or the output of described filter unit;
The input of described filter unit is connected with output.
In addition, described the first audio signal input pin comprises: L channel pin and/or R channel pin.
The present invention also provides a kind of audio signal receiving system, comprises: signal receiving module, signal transmitting module; It is characterized in that, in described audio signal receiving system, also comprise: the USB input interface; Wherein:
Described signal receiving module is connected with the audio signal input pin of described USB input interface, for by described audio signal input pin received audio signal;
Described signal transmitting module is connected with the signal output pin of described USB input interface, for by described signal output pin output signal;
Described audio signal input pin is a pin in D+ or D-pin, and described signal output pin is another pin in D+ or D-pin.
In addition, comprise in described signal receiving module: direct current signal isolated location, the first direct current biasing unit, the second direct current biasing unit, comparator;
The input of described direct current signal isolated location is connected with described audio signal input pin, output is connected with described the second direct current biasing unit, for isolating the DC level of the audio signal received by described audio signal input pin, and by its output output;
The input of described the second direct current biasing unit is connected with described direct current signal isolated location, output is connected with the negative pole of described comparator, for the audio signal to its input input, increase direct current biasing, and pass through the audio signal after its output output increases direct current biasing;
The output of described the first direct current biasing unit is connected with the positive pole of comparator, be used to exporting reference level;
Under the effect of described comparator for the reference level in its positive pole and negative pole input and audio signal, by the corresponding square wave of its output output audio signal.
In addition, described signal transmitting module comprises triple gate and resistance R 2;
One end of described resistance R 2 is connected with described signal output pin, and the other end is connected with the output of described triple gate;
Under the effect of described triple gate for the control signal of the data-signal in its input input and the input of its Enable Pin, pass through its output output signal.
In addition, the output of described comparator is connected by resistance R 7 with its positive pole, and the output of described comparator is connected with a pull-up resistor R8.
In addition, described the first direct current biasing unit comprises: resistance R 3, resistance R 4;
One end of described resistance R 3 is connected with power supply, and the other end is connected with described resistance R 4;
One end of described resistance R 4 is connected with the output of described resistance R 3 and described the first direct current biasing unit, other end ground connection;
Described the second direct current biasing unit comprises: resistance R 5, resistance R 6;
One end of described resistance R 5 is connected with power supply, and the other end is connected with described resistance R 6;
One end of described resistance R 6 is connected with the output of described resistance R 5 and described the second direct current biasing unit, other end ground connection;
The resistance of the output voltage of described the first direct current biasing power supply that unit connects, the resistance of described resistance R 3, described resistance R 4 is identical with the resistance of the resistance of the output voltage of described the second direct current biasing power supply that unit connects, described resistance R 5, described resistance R 6 respectively.
In sum, the above embodiment of the present invention has realized the audio frequency feeding function by lower hardware cost, with audio signal switching device of the present invention (for example, tone frequency channel wire or audio conversion joint) while being used in conjunction with, the audio signal receiving system can obtain electric energy in received audio signal and transmitted signal, reduce the cost of audio signal receiving system, reduced the volume of audio signal receiving system.
In addition, audio signal switching device of the present invention also comprises the USB output interface, therefore can be connected with the audio signal receiving system with usb function, the audio signal receiving system can obtain electric energy by the VBUS pin of USB interface, and respectively using a pin in D+ pin and D-pin as the audio signal input pin, another pin is used as the signal output pin, in order to realize both-way communication between audio signal dispensing device and audio signal receiving system.
The accompanying drawing explanation
Fig. 1 is the structural representation of audio signal switching device the first embodiment of the present invention;
Fig. 2 is the structural representation of audio signal receiving system the first embodiment of the present invention;
Fig. 3 is the structural representation of audio signal switching device the second embodiment of the present invention;
Fig. 4 is the structural representation of audio signal switching device of the present invention the 3rd embodiment;
Fig. 5 is the structural representation of audio signal switching device of the present invention the 4th embodiment;
Fig. 6 is the structural representation of audio signal switching device of the present invention the 5th embodiment;
Fig. 7 is the structural representation of audio signal switching device of the present invention the 6th embodiment;
Fig. 8 is the structural representation of audio signal receiving system the 6th embodiment of the present invention;
Fig. 9 is the structural representation of audio signal switching device of the present invention the 7th embodiment;
Figure 10 is the structural representation of audio signal switching device of the present invention the 8th embodiment;
Figure 11 is the structural representation of audio signal switching device of the present invention the 9th embodiment;
Figure 12 is the structural representation of audio signal switching device of the present invention the tenth embodiment.
Embodiment
Below in conjunction with drawings and Examples, describe the present invention.
Audio signal switching device of the present invention can be that tone frequency channel wire, audio transiting wire, audio repeating are first-class.
The first embodiment
Fig. 1 is the structural representation of audio signal switching device the first embodiment of the present invention; As shown in Figure 1, this audio signal switching device comprises: horn interface, boosting unit (step-up transformer as shown in Figure 1), rectification unit, filter unit, USB output interface (USB plug as shown in Figure 1); Wherein:
Horn interface, for for example, with audio signal dispensing device (, mobile phone), being connected, the audio signal of received audio signal dispensing device output, and can be to audio signal dispensing device output signal.
Above-mentioned horn interface can be low-resistance voice coil type horn interface (for example, earphone interface), wherein comprise: audio signal input pin (AUDIO pin as shown in Figure 1), Mike's pin (MIC pin as shown in Figure 1), ground wire pin (GND pin as shown in Figure 1).
The audio signal input pin of horn interface is connected with a pin of the primary coil of step-up transformer, for example, for the audio signal of received audio signal dispensing device (, mobile phone) transmission, and exports it above-mentioned pin of primary coil to; The ground wire pin ground connection of horn interface.
Step-up transformer, comprise primary coil and secondary coil, for the input voltage by input (primary coil) (being generally the 1V left and right), is increased to the output voltage (for example, being more than or equal to 5V) of output (secondary coil).
The primary coil of step-up transformer comprises two pins, and a pin is connected with the audio signal input pin of horn interface, another pin ground connection.
The output winding of step-up transformer comprises two output pins and a tap, and two output pins are connected with two input pins of rectification unit input respectively, tap ground connection.
Rectification unit, comprise input and output, carries out rectification for the interchange level to its input input, and by the level after its output output rectification.
In the present embodiment, rectification unit comprises two input pins of input, an output pin of output; Correspondingly, in rectification unit, comprise two diodes, the positive pole of two diodes is connected with two input pins of rectification unit respectively, and the negative pole of two diodes is connected with the output pin of rectification unit.
Filter unit, comprise input and output, for the level by the input input, is converted into the smooth direct current level, and exports by output.
In the present embodiment, the input of filter unit is connected with the output of rectification unit, the output of filter unit and power supply output pin, and namely the VBUS pin of USB output interface is connected, for coupled USB device provides power supply.
In the present embodiment, the input of filter unit is connected with its output, and comprises the capacitor C1 that an end is connected with input/output, the other end ground connection of capacitor C1.
In the USB output interface, comprise: power supply output pin (VBUS pin), audio signal output pin, signal input pin, ground wire pin (GND pin).
In the present embodiment, the audio signal output pin is the D+ pin, and the signal input pin is the D-pin.
In the present embodiment, audio signal output pin (D+ pin) is connected with the audio signal input pin (AUDIO pin) of horn interface, for the USB device output audio signal to coupled.
Alternatively, between the audio signal input pin of audio signal output pin and horn interface, can also comprise signal amplification unit, the input that is signal amplification unit is connected with the audio signal input pin of horn interface, the output of signal amplification unit is connected with audio signal output pin (D+ pin), the audio signal after output is amplified.
In the present embodiment, signal input pin (D-pin) is connected with Mike's pin (MIC pin) of horn interface, for the audio signal dispensing device transmitted signal to being connected with horn interface.
The ground wire pin ground connection of USB output interface.
Fig. 2 is the structural representation of audio signal receiving system the first embodiment of the present invention; As shown in Figure 2, this device comprises: USB input interface (USB slot as shown in Figure 1), signal receiving module, signal transmitting module.
In the USB input interface, comprise: power supply input pin (VBUS pin), audio signal input pin, signal output pin, ground wire pin (GND pin).
In the present embodiment, the audio signal input pin is the D+ pin, and the signal output pin is the D-pin.
The ground wire pin ground connection of USB input interface.
The input of signal receiving module is connected with the audio signal input pin, for passing through audio signal input pin received audio signal, and by its output output.
In signal receiving module, comprise: direct current signal isolated location, the first direct current biasing unit, the second direct current biasing unit, comparator.
In the present embodiment, the direct current signal isolated location comprises capacitor C1, for the isolated DC level, the end of capacitor C1 (input of direct current signal isolated location) is connected with the audio signal input pin, and the other end (output of direct current signal isolated location) is connected with the second direct current biasing unit.
The capacitance of capacitor C1 can be 0.1 μ F.
The output of the first direct current biasing unit is connected with the positive pole of comparator, for to comparator, exporting reference level.
In the present embodiment, the first direct current biasing unit comprises: resistance R 3, resistance R 4; One end of resistance R 3 is connected with power supply, and the other end is connected with resistance R 4; One end of resistance R 4 is connected with the output of resistance R 3 and the first direct current biasing unit, other end ground connection.
The input of the second direct current biasing unit is connected with the output of direct current signal isolated location, output is connected with the negative pole of comparator, for the audio signal to its input input, increase direct current biasing, the minimum voltage of audio signal is promoted to more than 0 volt, and by the audio signal after its output output increase direct current biasing.
In the present embodiment, the second direct current biasing unit comprises: resistance R 5, resistance R 6; One end of resistance R 5 is connected with power supply, and the other end is connected with resistance R 6; One end of resistance R 6 is connected with the output of the input of the second direct current biasing unit, resistance R 5 and the second direct current biasing unit, other end ground connection.
The resistance of the resistance of the output voltage of the power supply of the first direct current biasing unit, resistance R 3, resistance R 4 is identical with the resistance of the resistance of the output voltage of the power supply of the second direct current biasing unit, resistance R 5, resistance R 6 respectively.
In the present embodiment, the resistance of resistance R 3 and resistance R 5 can be 150K ohm, and the resistance of resistance R 4 and resistance R 6 can be 15K ohm.
As mentioned above, the positive pole of comparator is connected with the output of the first direct current biasing unit, the negative pole of comparator is connected with the output of the second direct current biasing unit, the output of comparator is connected with the output of signal receiving module the output of signal receiving module (namely as), the corresponding square wave of output audio signal.
In the present embodiment, in order to make the signal of comparator stable output, the output of comparator is connected by resistance R 7 with its positive pole, form loop, and the output of comparator is connected with a pull-up resistor R8.
The resistance of resistance R 7 can be 1.5M ohm, and the resistance of resistance R 8 can be 20K ohm.
The output of signal transmitting module is connected with the signal output pin, for output signal.
In the present embodiment, signal transmitting module comprises triple gate and resistance R 2.
One end of resistance R 2 is connected with the output of signal transmitting module, and the other end is connected with the output of triple gate.
Triple gate passes through its output output signal under the effect of the control signal that data-signal and the Enable Pin of its input input are inputted.
The second embodiment
Fig. 3 is the structural representation of audio signal switching device the second embodiment of the present invention; As shown in Figure 3, the difference of audio signal switching device the second embodiment and the first embodiment is:
In the second embodiment of audio signal switching device, audio signal output pin (D+ pin) is connected with arbitrary output pin of the output of step-up transformer, for the USB device output audio signal to coupled.
Audio signal receiving system the second embodiment is identical with the first embodiment.
The 3rd embodiment
Fig. 4 is the structural representation of audio signal switching device of the present invention the 3rd embodiment; As shown in Figure 4, the difference of audio signal switching device the 3rd embodiment and the first embodiment is:
In the 3rd embodiment of audio signal switching device, only an output pin in the step-up transformer secondary coil is connected with the input pin of rectification unit, therefore rectification unit only need comprise an input pin, in rectification unit, only need comprise a diode and get final product.
Obviously, compare with the first embodiment, adopt the present embodiment will lose half electric energy of step-up transformer secondary coil, but can simplify circuit structure, reduce hardware cost.
In the present embodiment, another output pin ground connection in the step-up transformer secondary coil, and step-up transformer does not comprise tap.
The 3rd embodiment is identical with the first embodiment for the audio signal receiving system.
The 4th embodiment
Fig. 5 is the structural representation of audio signal switching device of the present invention the 4th embodiment; As shown in Figure 4, the difference of audio signal switching device the 4th embodiment and the first embodiment is:
In the 4th embodiment of audio signal switching device, the audio signal input pin of horn interface comprises L channel pin and R channel pin, and the L channel pin is connected with the same pin of the primary coil of step-up transformer with the R channel pin.
The 4th embodiment is identical with the first embodiment for the audio signal receiving system.
The 5th embodiment
Fig. 6 is the structural representation of audio signal switching device of the present invention the 5th embodiment; As shown in Figure 6, the difference of audio signal switching device the 5th embodiment and the 4th embodiment is:
In the 5th embodiment, the audio signal input pin of horn interface comprises L channel pin and R channel pin, and the L channel pin is connected with the input of signal amplification unit, for output audio signal; The R channel pin is connected with a pin of the primary coil of step-up transformer, be used to exporting electric energy.
Certainly, can be also that the R channel pin is connected with the input of signal amplification unit, for output audio signal; The L channel pin is connected with a pin of the primary coil of step-up transformer, be used to exporting electric energy.
The 5th embodiment is identical with the first embodiment for the audio signal receiving system.
The 6th embodiment
Fig. 7 is the structural representation of audio signal switching device of the present invention the 6th embodiment; As shown in Figure 7, the difference of audio signal switching device the 6th embodiment and the first embodiment is:
The audio signal output pin is the D-pin, and the signal input pin is the D+ pin.That is, in the present embodiment, audio signal output pin (D-pin) directly is connected with the audio signal input pin (AUDIO pin) of horn interface, or is connected by signal amplification unit, for the USB device output audio signal to coupled; Signal input pin (D+ pin) is connected with Mike's pin (MIC pin) of horn interface, for the audio signal dispensing device transmitted signal to being connected with horn interface.
Fig. 8 is the structural representation of audio signal receiving system the 6th embodiment of the present invention; As shown in Figure 8, the difference of audio signal receiving system the 6th embodiment and the first embodiment is:
The audio signal input pin is the D-pin, and the signal output pin is the D+ pin.That is, in the present embodiment, the D-pin is connected with the input of signal receiving module, and the D+ pin is connected with the input of signal transmitting module.
The 7th embodiment
Fig. 9 is the structural representation of audio signal switching device of the present invention the 7th embodiment; As shown in Figure 9, the difference of audio signal switching device the 7th embodiment and the second embodiment is:
The audio signal output pin is the D-pin, and the signal input pin is the D+ pin.That is, in the present embodiment, audio signal output pin (D-pin) is connected with arbitrary output pin of the output of step-up transformer and directly is connected, or is connected by signal amplification unit, for the USB device output audio signal to coupled; Signal input pin (D+ pin) is connected with Mike's pin (MIC pin) of horn interface, for the audio signal dispensing device transmitted signal to being connected with horn interface.
Audio signal receiving system the 7th embodiment is identical with the 6th embodiment.
The 8th embodiment
Figure 10 is the structural representation of audio signal switching device of the present invention the 8th embodiment; As shown in figure 10, the difference of audio signal switching device the 8th embodiment and the 3rd embodiment is:
The audio signal output pin is the D-pin, and the signal input pin is the D+ pin.That is, in the present embodiment, audio signal output pin (D-pin) directly is connected with the audio signal input pin (AUDIO pin) of horn interface, or is connected by signal amplification unit, for the USB device output audio signal to coupled; Signal input pin (D+ pin) is connected with Mike's pin (MIC pin) of horn interface, for the audio signal dispensing device transmitted signal to being connected with horn interface.
Audio signal receiving system the 8th embodiment is identical with the 6th embodiment.
The 9th embodiment
Figure 11 is the structural representation of audio signal switching device of the present invention the 9th embodiment; As shown in figure 11, the difference of audio signal switching device the 9th embodiment and the 4th embodiment is:
The audio signal output pin is the D-pin, and the signal input pin is the D+ pin.That is, in the present embodiment, audio signal output pin (D-pin) directly is connected with two audio signal input pins of horn interface, or is connected by signal amplification unit, for the USB device output audio signal to coupled; Signal input pin (D+ pin) is connected with Mike's pin (MIC pin) of horn interface, for the audio signal dispensing device transmitted signal to being connected with horn interface.
Audio signal receiving system the 9th embodiment is identical with the 6th embodiment.
The tenth embodiment
Figure 12 is the structural representation of audio signal switching device of the present invention the tenth embodiment; As shown in figure 12, the difference of audio signal switching device the tenth embodiment and the 5th embodiment is:
The audio signal output pin is the D-pin, and the signal input pin is the D+ pin.That is, in the present embodiment, audio signal output pin (D-pin) directly is connected with an audio signal input pin of horn interface, or is connected by signal amplification unit, for the USB device output audio signal to coupled; Signal input pin (D+ pin) is connected with Mike's pin (MIC pin) of horn interface, for the audio signal dispensing device transmitted signal to being connected with horn interface.
Audio signal receiving system the tenth embodiment is identical with the 6th embodiment.
The above embodiment of the present invention has realized the audio frequency feeding function by lower hardware cost, while with audio signal switching device of the present invention, being used in conjunction with, the audio signal receiving system can obtain electric energy at received audio signal and in audio signal dispensing device transmitted signal, reduce the cost of audio signal receiving system, reduced the volume of audio signal receiving system.
In addition, audio signal switching device of the present invention also comprises the USB output interface, therefore can be connected with the audio signal receiving system with usb function, the audio signal receiving system can obtain electric energy by the VBUS pin of USB interface, and respectively using a pin in D+ pin and D-pin as the audio signal input pin, another pin is used as the signal output pin, in order to realize both-way communication between audio signal dispensing device and audio signal receiving system.
Certainly, according to basic principle of the present invention, the horn interface in above-described embodiment can be replaced with have the audio signal input pin, the input interface of other type of Mike's pin and ground wire pin.
In addition, above-mentioned input interface also can be fixedly connected on the audio signal dispensing device.
Above-mentioned input interface can be divided into a plurality of plugs, for example, is divided into the audio signal plug that comprises the audio signal input pin, and the Mike's plug that comprises Mike's pin.
Claims (9)
1. an audio signal switching device, comprise: input interface, USB output interface; It is characterized in that, also comprise in described audio signal switching device: boosting unit and signal amplifier; Wherein:
Described input interface is earphone interface, wherein said input interface comprises the first audio signal input pin, the audio signal that described the first audio signal input pin sends for receiving coupled audio signal dispensing device, and export it input of described boosting unit to;
Described USB output interface comprises the audio signal output pin;
Described boosting unit, for the audio signal to its input input, boost, and the audio signal after boosting by its output exports described signal amplifier to;
Described signal amplifier, be connected with the output of described boosting unit, and be connected with the audio signal output pin of described USB output interface, be used to exporting the audio signal after amplification;
Wherein said audio signal output pin is D+ pin or the D-pin in the USB output interface.
2. audio signal switching device as claimed in claim 1, is characterized in that,
Described boosting unit is step-up transformer, and described step-up transformer comprises primary coil and secondary coil;
A pin of described primary coil is connected with described the first audio signal input pin as the input of described boosting unit, another pin ground connection of described primary coil;
At least one output pin of described secondary coil is connected with the input of described rectification unit as the output of described boosting unit, the tap ground connection of described secondary coil.
3. audio signal switching device as claimed in claim 1 or 2, is characterized in that, in described audio signal switching device, also comprises rectification unit and filter unit, wherein:
Described rectification unit, carry out rectification for the audio signal to after the boosting of its input input, and by its output, export the level obtained after rectification the input of described filter unit to;
Described filter unit, carry out filtering for the level to its input input, and by its output, export the DC level obtained after filtering the VBUS pin of described USB output interface to.
4. audio signal switching device as described as the claims 1 to 3 any one, is characterized in that,
In described input interface, also comprise Mike's pin;
When described audio signal output pin was the D+ pin in the USB output interface, described Mike's pin was connected with the D-pin of described USB output interface;
Described D-pin is used for receiving signal, and by described Mike's pin output.
5. audio signal switching device as described as the claims 1 to 3 any one, is characterized in that,
In described input interface, also comprise Mike's pin;
When described audio signal output pin was the D-pin in the USB output interface, described Mike's pin was connected with the D+ pin of described USB output interface;
Described D+ pin is used for receiving signal, and by described Mike's pin output.
6. audio signal switching device as described as claim 3 to 5 any one, is characterized in that,
In described rectification unit, comprise at least one diode, the positive pole of described diode is connected with the input of described rectification unit, and the negative pole of described diode is connected with the output of described rectification unit.
7. audio signal switching device as claimed in claim 3, is characterized in that,
The secondary coil of described step-up transformer comprises two output pins; The input of described rectification unit comprises two input pins;
Two output pins of described secondary coil are connected with two input pins of described rectification unit respectively;
In described rectification unit, comprise two diodes, the positive pole of described two diodes is connected with two input pins of described rectification unit respectively.
8. audio signal switching device as claimed in claim 1, is characterized in that,
In described filter unit, comprise capacitor;
One end of described capacitor is connected with input or the output of described filter unit;
The input of described filter unit is connected with output.
9. described audio signal switching device as arbitrary as claim 1 to 8, is characterized in that,
Described the first audio signal input pin comprises: L channel pin and/or R channel pin.
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| CN111030465A (en) * | 2019-12-24 | 2020-04-17 | 深圳市绿联科技有限公司 | Wireless audio receiving device with isolated power supply |
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| CN103414071B (en) | 2016-08-10 |
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