CN205081950U - Audio signal input mode switching circuit and stereo set of stereo set - Google Patents
Audio signal input mode switching circuit and stereo set of stereo set Download PDFInfo
- Publication number
- CN205081950U CN205081950U CN201520871704.6U CN201520871704U CN205081950U CN 205081950 U CN205081950 U CN 205081950U CN 201520871704 U CN201520871704 U CN 201520871704U CN 205081950 U CN205081950 U CN 205081950U
- Authority
- CN
- China
- Prior art keywords
- input
- module
- power amplifier
- audio frequency
- frequency power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses an audio signal input mode switching circuit and stereo set of stereo set, the forward transportation output of the audio signal input mode switching circuit's of stereo set AUX interface is connected with the first input end of audio power amplifier module, and the negative output end is connected with the third input of audio power amplifier module, bluetooth audio interface's the L channel forward transportation output and the first input end of audio power amplifier module are connected, and L channel negative output end is connected with the second input of audio power amplifier module, and R channel forward transportation output is connected with the third input of audio power amplifier module, and R channel negative output end is connected with the fourth input of audio power amplifier module, feed back the measuring signal output part who holds with detection module and are connected, detection module's sense terminal and AUX interface connection, the detection signal input part of switching module and detection module's detection signal output part are connected, and the one end of just switching the module is not connected with ground, and the other end is connected with the second input and the fourth input of audio power amplifier module.
Description
Technical field
The utility model relates to sound technique field, particularly a kind of audio signal input pattern commutation circuit of sound equipment and sound equipment.
Background technology
Current sound equipment can the differential signal of compatible bluetooth module output and the single-ended signal of AUX interface output.For realizing the object of above-mentioned compatibility, current sound equipment is generally another adds a special audio operational amplifier.Differential input signal is converted to Single-end output signal by this audio operational amplifier, and then enters into audio frequency power amplifier rear class together with the single ended signal of AUX interface input.To sum up, existing sound equipment turns the audio frequency amplifier of single ended input owing to adding one-level Differential Input, not only directly increase hardware cost, and makes the schematic diagram of sound equipment, the design of PCB and hardware debug become more complicated, the each noise like of easier drawing-in system, thus make signal to noise ratio relatively high.
Utility model content
Main purpose of the present utility model is the audio signal input pattern commutation circuit proposing a kind of sound equipment, is intended to relatively reduce hardware cost, simplifies acoustics circuit schematic diagram, PCB design and hardware debug, and reduces signal to noise ratio.
For achieving the above object, the audio signal input pattern commutation circuit of the sound equipment that the utility model proposes, it comprises:
Can the audio frequency power amplifier module of compatible differential input signal and single ended signal, it comprises first input end, second input corresponding with first input end, the 3rd input, and the four-input terminal corresponding with the 3rd input;
Be connected the AUX interface also exporting single-ended signal according to the sound source signal received with AUX source of sound, it comprises positive output end and negative output terminal;
Whether real-time detection described AUX interface connects to described AUX source of sound and exports the detection module of corresponding detection signal;
Receive audio signal that bluetooth module exports and export corresponding differential signal to described audio frequency power amplifier module, the detection signal that described detection module exports fed back to the Bluetooth audio frequency interface that described bluetooth module exports to control described bluetooth module or stop output audio signal, it comprises L channel positive output end, L channel negative output terminal, R channel positive output end, R channel negative output terminal and feedback end;
The second input of described audio frequency power amplifier module and four-input terminal ground connection or earth-free handover module is controlled according to described detection signal; Wherein,
The positive output end of described AUX interface is connected with the first input end of described audio frequency power amplifier module, and negative output terminal is connected with the 3rd input of described audio frequency power amplifier module; The L channel positive output end of described Bluetooth audio frequency interface is connected with the first input end of described audio frequency power amplifier module, described L channel negative output terminal is connected with the second input of described audio frequency power amplifier module, described R channel positive output end is connected with the 3rd input of described audio frequency power amplifier module, described R channel negative output terminal is connected with the four-input terminal of described audio frequency power amplifier module, and described feedback end is connected with the detection signal output of described detection module; The test side of described detection module is connected with described AUX interface; The detection signal input of described handover module is connected with the detection signal output of described detection module, and one end of described handover module is connected to ground, and the second input and the four-input terminal of the other end and described audio frequency power amplifier module are connected.
Preferably, described handover module comprises: the first earthed switch unit that can make the second input end grounding of audio frequency power amplifier module according to described detection signal, and can make the second earthed switch unit of four-input terminal ground connection of audio frequency power amplifier module according to described detection signal; Wherein, the described first end of the first earthed switch unit is connected with the second input of described audio frequency power amplifier module, second end ground connection of described first earthed switch unit, the described controlled end of the first earthed switch unit is connected with the detection signal output of described detection module; The first end of described second earthed switch unit is connected with the four-input terminal of described audio frequency power amplifier module, second end ground connection of described second earthed switch unit, the described controlled end of the second earthed switch unit is connected with the detection signal output of described detection module.
Preferably, described handover module comprises: the first earthed switch unit that can make the second input end grounding of audio frequency power amplifier module according to described detection signal or disconnect with ground, and according to the second earthed switch unit that described detection signal can make the four-input terminal ground connection of audio frequency power amplifier module or disconnect with ground; Wherein, the described first end of the first earthed switch unit is connected with the second input of described audio frequency power amplifier module, second end ground connection of described first earthed switch unit, the described controlled end of the first earthed switch unit is connected with the detection signal output of described detection module; The first end of described second earthed switch unit is connected with the four-input terminal of described audio frequency power amplifier module, second end ground connection of described second earthed switch unit, the described controlled end of the second earthed switch unit is connected with the detection signal output of described detection module.
Preferably, described second earthed switch unit comprises: the 2nd N channel enhancement field effect transistor, the grid of described 2nd N channel enhancement field effect transistor is connected with the detection signal output of described detection module, the source ground of described 2nd N channel enhancement field effect transistor, the drain electrode of a described N channel enhancement field effect transistor is connected with the four-input terminal of described audio frequency power amplifier module.
Preferably, described second earthed switch unit also comprises: the second electric capacity and the second resistance, the first end of described second electric capacity is connected with the four-input terminal of described audio frequency power amplifier module through described second resistance, and the second end of described second electric capacity is connected with the drain electrode of described 2nd N channel enhancement field effect transistor.
Preferably, the audio signal input pattern commutation circuit of sound equipment also comprises for filtering low frequency signal with the filtration module avoiding low frequency signal to enter into described audio frequency power amplifier module, and described filtration module is located at described audio frequency power amplifier module and described Bluetooth audio frequency interface, between audio frequency power amplifier module and described AUX interface.
Preferably, described filtration module comprises the 3rd electric capacity and the 3rd resistance, and the first end of described 3rd electric capacity is connected with described audio frequency power amplifier module through described 3rd resistance, and the second end of described 3rd electric capacity is connected with described Bluetooth audio frequency interface or AUX interface.
Preferably, described detection module comprises: triode, the 4th electric capacity, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance; Described AUX interface also comprises the connection signal output of the output low level when it is connected with described AUX source of sound; The base stage of described triode is connected with the connection signal output of described AUX interface through described 4th resistance, the emitter of described triode is connected with external dc power, and the emitter of described triode is through described 5th resistance, the 4th capacity earth, the collector electrode of described triode is through described 6th resistance, the 7th grounding through resistance; Node between described 6th resistance and described 7th resistance is as the detection signal output of described detection module.
The utility model also proposes a kind of sound equipment, comprises the audio signal input pattern commutation circuit of sound equipment.The audio signal input pattern commutation circuit of this sound equipment comprises:
Can the audio frequency power amplifier module of compatible differential input signal and single ended signal, it comprises first input end, second input corresponding with first input end, the 3rd input, and the four-input terminal corresponding with the 3rd input;
Be connected the AUX interface also exporting single-ended signal according to the sound source signal received with AUX source of sound, it comprises positive output end and negative output terminal;
Whether real-time detection described AUX interface connects to described AUX source of sound and exports the detection module of corresponding detection signal;
Receive audio signal that bluetooth module exports and export corresponding differential signal to described audio frequency power amplifier module, the detection signal that described detection module exports fed back to the Bluetooth audio frequency interface that described bluetooth module exports to control described bluetooth module or stop output audio signal, it comprises L channel positive output end, L channel negative output terminal, R channel positive output end, R channel negative output terminal and feedback end;
The second input of described audio frequency power amplifier module and four-input terminal ground connection or earth-free handover module is controlled according to described detection signal; Wherein,
The positive output end of described AUX interface is connected with the first input end of described audio frequency power amplifier module, and negative output terminal is connected with the 3rd input of described audio frequency power amplifier module; The L channel positive output end of described Bluetooth audio frequency interface is connected with the first input end of described audio frequency power amplifier module, described L channel negative output terminal is connected with the second input of described audio frequency power amplifier module, described R channel positive output end is connected with the 3rd input of described audio frequency power amplifier module, described R channel negative output terminal is connected with the four-input terminal of described audio frequency power amplifier module, and described feedback end is connected with the detection signal output of described detection module; The test side of described detection module is connected with described AUX interface; The detection signal input of described handover module is connected with the detection signal output of described detection module, and one end of described handover module is connected to ground, and the second input and the four-input terminal of the other end and described audio frequency power amplifier module are connected.
The annexation of technical solutions of the utility model by adopting detection module to detect AUX interface and AUX source of sound in real time.When AUX interface is connected with AUX source of sound, bluetooth module then stops output audio signal, handover module and then by the second input of audio frequency power amplifier module and four-input terminal ground connection.Audio frequency power amplifier module is operated in single ended input pattern, and carries out amplification process to the single-ended signal that AUX source of sound exports.Otherwise, when AUX interface and AUX source of sound disconnect, bluetooth module then output audio signal, handover module so by the second input of audio frequency power amplifier module and four-input terminal with disconnect.Audio frequency power amplifier module is operated in Differential Input pattern, and carries out amplification process to the differential signal that bluetooth module exports.The utility model does not need additionally to increase audio frequency amplifier amplifier also can compatible difference modes and single-ended mode, relatively reduces hardware cost.In addition, acoustics circuit schematic diagram, PCB design and hardware debug is simplified.Moreover relative to acoustic signal change-over circuit of the prior art, the utility model reduces signal to noise ratio.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, the structure according to these accompanying drawings can also obtain other accompanying drawing.
Fig. 1 is the module map of the audio signal input pattern commutation circuit of the utility model sound equipment;
Fig. 2 is the circuit diagram of an embodiment of the audio signal input pattern commutation circuit of the utility model sound equipment.
Drawing reference numeral illustrates:
| Label | Title | Label | Title |
| 1 | Audio frequency power amplifier module | 2 | AUX interface |
| 3 | Detection module | 4 | Bluetooth audio frequency interface |
| 5 | Handover module | 51 | First earthed switch unit |
| 52 | Second earthed switch unit | 6 | Filtration module |
| 7 | AUX source of sound | 8 | Bluetooth module |
| Q1 | One N channel enhancement field effect transistor | Q2 | 2nd N channel enhancement field effect transistor |
| Q2 | Triode | C1 | First electric capacity |
| C2 | Second electric capacity | C3 | 3rd electric capacity |
| C4 | 4th electric capacity | R1 | First resistance |
| R2 | Second resistance | R3 | 3rd resistance |
| R4 | 4th resistance | R5 | 5th resistance |
| R6 | 6th resistance | R7 | 7th resistance |
The realization of the utility model object, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Concrete Implementation Modes
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Need explanation, all directivity instruction (such as up, down, left, right, before and afters in the utility model embodiment ...) only for explaining the relative position relation, motion conditions etc. under a certain particular pose (as shown in drawings) between each parts, if when this particular pose changes, then directionality instruction also correspondingly changes thereupon.
In addition, in the utility model, relate to the description of " first ", " second " etc. only for describing object, and instruction can not be interpreted as or imply its relative importance or the implicit quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In addition; technical scheme between each embodiment can be combined with each other; but must be can be embodied as basis with those of ordinary skill in the art; when technical scheme combination occur conflicting maybe cannot realize time will be understood that the combination of this technical scheme does not exist, also not the utility model require protection range within.
The utility model proposes a kind of audio signal input pattern commutation circuit of sound equipment.
It is the structural representation module map of an embodiment of the audio signal input pattern commutation circuit of the utility model theme one sound equipment with reference to figure 1 and Fig. 2, Fig. 1; Fig. 2 is the circuit diagram of an embodiment of the audio signal input pattern commutation circuit of the utility model sound equipment.
With reference to Fig. 1, in the utility model embodiment, the audio signal input pattern commutation circuit of this sound equipment comprises audio frequency power amplifier module 1, AUX interface 2, detection module 3, Bluetooth audio frequency interface 4, handover module 5, wherein:
Audio frequency power amplifier module 1 is for carrying out amplification process to audio signal.In the present embodiment, the differential input signal that this audio frequency power amplifier module 1 can not only export bluetooth module 8 carries out amplification process, and the single ended signal that can export AUX source of sound carries out amplification process.This audio frequency power amplifier module 1 comprises first input end, second input corresponding with first input end, the 3rd input, and the four-input terminal corresponding with the 3rd input, i.e. first input end and the second input differential signal that input amplitude is identical respectively, phase place is contrary, and the 3rd input and the four-input terminal differential signal that input amplitude is identical respectively, phase place is contrary.
AUX interface 2, is connected with AUX source of sound 7, to receive the sound source signal of AUX source of sound 7, and exports single-ended signal according to the sound source signal received.This AUX interface 2 comprises positive output end and negative output terminal.The positive output end of AUX interface 2 is connected with the first input end of audio frequency power amplifier module 1, and negative output terminal is connected with the 3rd input of audio frequency power amplifier module 1.
Whether detection module 3 is connected with AUX interface 2, detect AUX interface 2 in real time and be connected with AUX source of sound 7, and export corresponding detection signal.
Bluetooth audio frequency interface 4, this Bluetooth audio frequency interface 4 comprises the input be connected with bluetooth module 8, and this Bluetooth audio frequency interface also comprises: L channel positive output end, L channel negative output terminal, R channel positive output end, R channel negative output terminal and feedback end.The L channel positive output end of Bluetooth audio frequency interface 4 is connected with the first input end of audio frequency power amplifier module 1, L channel negative output terminal is connected with the second input of audio frequency power amplifier module 1, R channel positive output end is connected with the 3rd input of audio frequency power amplifier module 1, R channel negative output terminal is connected with the four-input terminal of audio frequency power amplifier module 1, and feedback end is connected with the detection signal output of detection module 3.This Bluetooth audio frequency interface 4 receives the audio signal that bluetooth module 8 exports, and exports corresponding differential signal to audio frequency power amplifier module 1 according to the audio signal received; The detection signal that detection module 3 exports is fed back to bluetooth module 8, exports to control bluetooth module 8 or stop output audio signal.
The first interface of handover module 5 is connected with detection module 3, receives the detection signal that detection module 3 exports, and controls the second input of audio frequency power amplifier module 1 and four-input terminal ground connection or earth-free according to detection signal; Wherein, the second interface of handover module 5 is connected to ground, and the 3rd interface second input with audio frequency power amplifier module 1 corresponding to the 4th interface and four-input terminal are connected.Handover module 5, according to the detection signal of detection module 3, by controlling connection or the disconnection of the second interface and the 3rd interface and the 4th interface, thus controls the second input of audio frequency power amplifier module 1 and four-input terminal ground connection or earth-free.
Above-mentioned audio frequency power amplifier module 1, by the control of handover module 3, can switch between Differential Input pattern and single ended input pattern.In the present embodiment, when AUX interface 2 is connected with AUX source of sound 7, audio frequency power amplifier module 1 is operated in single ended input pattern, carries out amplification process with the single-ended signal exported AUX interface 2.Otherwise audio frequency power amplifier module 1 is operated in Differential Input pattern, carry out amplification process with the differential signal exported Bluetooth audio frequency interface 4.Concrete handoff procedure is:
In the present embodiment, detect AUX interface 2 in real time by detection module 3 whether to be connected with AUX source of sound 7.If have, then export and connect detection signal.When handover module 5 receives the detection signal of connection of detection module 3 output, this handover module 5 controls the second input, the four-input terminal ground connection of audio frequency power amplifier module 1.The positive output end of AUX interface 2 is then connected with the first input end of audio frequency power amplifier module 1, and with the second input of ground connection for reference voltage.The negative output terminal of AUX interface 2 is then connected with the 3rd input of audio frequency power amplifier module 1, and with the four-input terminal of ground connection for reference voltage, thus achieves audio frequency power amplifier module 1 is switched to single ended input pattern.Meanwhile, this has connected detection signal and has fed back to Bluetooth audio frequency interface 4, and is fed back in bluetooth module 8 by Bluetooth audio frequency interface 4.Bluetooth module 8 bases have connected detection signal and have stopped playing (stopping output audio signal).When audio frequency power amplifier module 1 switches to single ended input pattern, the input of its first input end needs the signal amplifying process, its second input end grounding.Meanwhile, the 3rd input input signal, four-input terminal ground connection.In the present embodiment, the positive audio signal of first input end input AUX source of sound.The negative audio signal of the 3rd input input AUX source of sound.
Otherwise when AUX interface 2 unsettled (AUX interface 2 is not connected with AUX source of sound 7), detection module 3 output does not connect detection signal.Handover module 5 disconnects the connection on the second input of audio frequency power amplifier module 1, four-input terminal and ground.Meanwhile, bluetooth module 8 according to do not connect detection signal start play and output audio signal to Bluetooth audio frequency interface 4.Bluetooth audio frequency interface 4 exports L channel positive audio signal the first input end of audio frequency power amplifier module 1 to, L channel bears the second input that audio signal exports audio frequency power amplifier module 1 to, R channel positive audio signal exports the 3rd input of audio frequency power amplifier module 1 to, R channel bears the four-input terminal that audio signal exports audio frequency power amplifier module 1 to, thus audio frequency power amplifier module 1 is switched to Differential Input pattern.When audio frequency power amplifier module 1 switches to Differential Input pattern, its first input end and the second input be the identical but signal that phase place is contrary of input amplitude simultaneously.In the present embodiment, first input end input L channel positive audio signal, the second input input L channel bears audio signal.3rd input and the four-input terminal also simultaneously identical but signal that phase place is contrary of input amplitude.In the present embodiment, the 3rd input input R channel positive audio signal, four-input terminal input R channel bears audio signal.
The annexation of technical solutions of the utility model by adopting detection module 3 to detect AUX interface 2 and AUX source of sound 7 in real time.When AUX interface 2 is connected with AUX source of sound 7, bluetooth module 8 stops output audio signal, handover module 5 and then by the second input of audio frequency power amplifier module 1 and four-input terminal ground connection.Audio frequency power amplifier module 1 is operated in single ended input pattern, and carries out amplification process to the single-ended signal that AUX source of sound 7 exports.Otherwise, when AUX interface 2 disconnects with AUX source of sound 7, bluetooth module 8 output audio signals, handover module 5 so by the second input of audio frequency power amplifier module 1 and four-input terminal and disconnect.Audio frequency power amplifier module 1 is operated in Differential Input pattern, and carries out amplification process to the differential signal that bluetooth module 8 exports.The utility model does not need additionally to increase audio frequency amplifier amplifier also can compatible difference modes and single-ended mode, relatively reduces hardware cost.In addition, acoustics circuit schematic diagram, PCB design and hardware debug is simplified.Moreover relative to acoustic signal change-over circuit of the prior art, the utility model reduces signal to noise ratio.
Preferably, as shown in Figure 2, above-mentioned handover module 5 comprises: the first earthed switch unit 51 that can make the second input end grounding of audio frequency power amplifier module 1 according to detection signal or disconnect with ground, and according to the second earthed switch unit 52 that detection signal can make the four-input terminal ground connection of audio frequency power amplifier module 1 or disconnect with ground.Wherein, the first end of the first earthed switch unit 51 is connected with the second input of audio frequency power amplifier module 1, and the second end ground connection of the first earthed switch unit 51, the controlled end of the first earthed switch unit 51 is connected with the detection signal output of detection module 3.The first end of the second earthed switch unit 52 is connected with the four-input terminal of audio frequency power amplifier module 1, and the second end ground connection of the second earthed switch unit 52, the controlled end of the second earthed switch unit 52 is connected with the detection signal output of detection module 3.
Particularly, in order to further simplify circuit, reduce hardware cost, in the present embodiment, first earthed switch unit 51 comprises a N channel enhancement field effect transistor Q1, the grid of the one N channel enhancement field effect transistor Q1 is connected with the detection signal output of detection module 3, the source ground of a N channel enhancement field effect transistor Q1, and the drain electrode of a N channel enhancement field effect transistor Q1 is connected with the second input of audio frequency power amplifier module 1.In the present embodiment, when grid is high level, when namely the voltage difference of grid and source electrode is greater than cut-in voltage, source electrode and drain electrode conducting.Now, namely achieve the second input end grounding of audio frequency power amplifier module 1.When grid is low level, when namely the voltage difference of grid and source electrode is less than cut-in voltage, source electrode ends with drain electrode.Now, namely achieve by the second input of audio frequency power amplifier module 1 with disconnect.It should be noted that the examined module controls of grid of a N channel enhancement field effect transistor Q1.
Further, for avoiding introducing noise, in the present embodiment, the first earthed switch unit 51 also comprises the first electric capacity C1 and the first resistance R1.The first end of the first electric capacity C1 is connected with the second input of audio frequency power amplifier module 1 through the first resistance R1, and second end of the first electric capacity C1 is connected with the drain electrode of a N channel enhancement field effect transistor Q1.
Particularly, for further simplifying circuit, reduce hardware cost, in the present embodiment, second earthed switch unit 52 comprises: the 2nd N channel enhancement field effect transistor Q2, the grid of the 2nd N channel enhancement field effect transistor Q2 is connected with the detection signal output of detection module 3, the source ground of the 2nd N channel enhancement field effect transistor Q2, and the drain electrode of a N channel enhancement field effect transistor Q1 is connected with the four-input terminal of audio frequency power amplifier module 1.The operation principle that it should be noted that the second earthed switch unit 52 and the effect that will reach identical with above-mentioned first earthed switch unit 52, please refer to the first earthed switch 52 and understand the present embodiment, do not repeat them here.
Further, for avoiding introducing noise, in the present embodiment, the second earthed switch unit 52 also comprises: the second electric capacity C2 and the second resistance R2.The first end of the second electric capacity C2 is connected with the four-input terminal of audio frequency power amplifier module 1 through the second resistance R2, and second end of the second electric capacity C2 is connected with the drain electrode of the 2nd N channel enhancement field effect transistor Q2.
Further, the low frequency signals such as direct current are introduced for avoiding each input of audio signal, in the present embodiment, the audio signal input pattern commutation circuit of sound equipment also comprises for filtering low frequency signal with the filtration module 6 avoiding low frequency signal to enter into audio frequency power amplifier module 1.Filtration module 6 is located at audio frequency power amplifier module 1 and Bluetooth audio frequency interface 4, between audio frequency power amplifier module 1 and AUX interface 2.It should be noted that and be connected with above-mentioned filtration module 6 between Bluetooth audio frequency interface 4 and audio frequency power amplifier module 1 interface, and the connection between AUX interface 2 and audio frequency power amplifier module 1 interface is also provided with above-mentioned filtration module 6.
Particularly, filtration module 6 comprises the 3rd electric capacity C3 and the 3rd resistance R3, and the first end of the 3rd electric capacity C3 is connected with audio frequency power amplifier module 1 through the 3rd resistance R3, and second end of the 3rd electric capacity C3 is connected with Bluetooth audio frequency interface 4 or AUX interface 2.
Further, detection module 3 comprises: triode Q3, the 4th electric capacity C4, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7.AUX interface 2 also comprises the connection signal output of the output low level when it is connected with AUX source of sound 7.The base stage of triode Q3 is connected with the connection signal output of AUX interface 2 through the 4th resistance R4, the emitter of triode Q3 is connected with external dc power, and the emitter of triode Q3 is through the 5th resistance R5, the 4th electric capacity C4 ground connection, the collector electrode of triode Q3 is through the 6th resistance R6, the 7th resistance R7 ground connection.Node between 6th resistance R6 and the 7th resistance R7 is as the detection signal output of detection module 3.
In the present embodiment, when AUX interface 2 is not connected with AUX source of sound 7, the connection signal output of AUX interface 2 is unsettled.Therefore, the base stage of triode Q3 is high level.It should be noted that triode Q3 is PNP triode Q3.When the base stage of triode Q3 is high level, triode Q3 is in cut-off state, thus makes the node between the 6th resistance R6 and the 7th resistance R7 present low level, i.e. the overall output low level detection signal of detection module 3.When AUX interface 2 is connected with AUX source of sound 7, the connection signal output of AUX interface 2 is low level.Triode Q3 saturation conduction, thus make the node between the 6th resistance R6 and the 7th resistance R7 present high level, namely detection module 3 entirety exports high level detection signal.
The utility model also proposes a kind of sound equipment, this sound equipment comprises the audio signal input pattern commutation circuit of sound equipment, the concrete structure of the audio signal input pattern commutation circuit of this sound equipment is with reference to above-described embodiment, because this sound equipment have employed whole technical schemes of above-mentioned all embodiments, therefore all beneficial effects that the technical scheme at least having above-described embodiment is brought, this is no longer going to repeat them.
The foregoing is only preferred embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every under inventive concept of the present utility model; utilize the equivalent structure transformation that the utility model specification and accompanying drawing content are done, or directly/be indirectly used in other relevant technical fields to include in scope of patent protection of the present utility model.
Claims (10)
1. an audio signal input pattern commutation circuit for sound equipment, is characterized in that, comprising:
Can the audio frequency power amplifier module of compatible differential input signal and single ended signal, it comprises first input end, second input corresponding with first input end, the 3rd input, and the four-input terminal corresponding with the 3rd input;
Be connected the AUX interface also exporting single-ended signal according to the sound source signal received with AUX source of sound, it comprises positive output end and negative output terminal;
Whether real-time detection described AUX interface connects to described AUX source of sound and exports the detection module of corresponding detection signal;
Receive audio signal that bluetooth module exports and export corresponding differential signal to described audio frequency power amplifier module, the detection signal that described detection module exports fed back to the Bluetooth audio frequency interface that described bluetooth module exports to control described bluetooth module or stop output audio signal, it comprises L channel positive output end, L channel negative output terminal, R channel positive output end, R channel negative output terminal and feedback end;
The second input of described audio frequency power amplifier module and four-input terminal ground connection or earth-free handover module is controlled according to described detection signal; Wherein,
The positive output end of described AUX interface is connected with the first input end of described audio frequency power amplifier module, and negative output terminal is connected with the 3rd input of described audio frequency power amplifier module; The L channel positive output end of described Bluetooth audio frequency interface is connected with the first input end of described audio frequency power amplifier module, described L channel negative output terminal is connected with the second input of described audio frequency power amplifier module, described R channel positive output end is connected with the 3rd input of described audio frequency power amplifier module, described R channel negative output terminal is connected with the four-input terminal of described audio frequency power amplifier module, and described feedback end is connected with the detection signal output of described detection module; The test side of described detection module is connected with described AUX interface; The detection signal input of described handover module is connected with the detection signal output of described detection module, and one end of described handover module is connected to ground, and the second input and the four-input terminal of the other end and described audio frequency power amplifier module are connected.
2. the audio signal input pattern commutation circuit of sound equipment as claimed in claim 1, it is characterized in that, described handover module comprises: the first earthed switch unit that can make the second input end grounding of audio frequency power amplifier module according to described detection signal or disconnect with ground, and according to the second earthed switch unit that described detection signal can make the four-input terminal ground connection of audio frequency power amplifier module or disconnect with ground; Wherein, the described first end of the first earthed switch unit is connected with the second input of described audio frequency power amplifier module, second end ground connection of described first earthed switch unit, the described controlled end of the first earthed switch unit is connected with the detection signal output of described detection module; The first end of described second earthed switch unit is connected with the four-input terminal of described audio frequency power amplifier module, second end ground connection of described second earthed switch unit, the described controlled end of the second earthed switch unit is connected with the detection signal output of described detection module.
3. the audio signal input pattern commutation circuit of sound equipment as claimed in claim 2, it is characterized in that, described first earthed switch unit comprises a N channel enhancement field effect transistor, the grid of a described N channel enhancement field effect transistor is connected with the detection signal output of described detection module, the source ground of a described N channel enhancement field effect transistor, the drain electrode of a described N channel enhancement field effect transistor is connected with the second input of described audio frequency power amplifier module.
4. the audio signal input pattern commutation circuit of sound equipment as claimed in claim 3, it is characterized in that, described first earthed switch unit also comprises the first electric capacity and the first resistance, the first end of described first electric capacity is connected with the second input of described audio frequency power amplifier module through described first resistance, and the second end of described first electric capacity is connected with the drain electrode of a described N channel enhancement field effect transistor.
5. the audio signal input pattern commutation circuit of sound equipment as claimed in claim 2, it is characterized in that, described second earthed switch unit comprises: the 2nd N channel enhancement field effect transistor, the grid of described 2nd N channel enhancement field effect transistor is connected with the detection signal output of described detection module, the source ground of described 2nd N channel enhancement field effect transistor, the drain electrode of a described N channel enhancement field effect transistor is connected with the four-input terminal of described audio frequency power amplifier module.
6. the audio signal input pattern commutation circuit of sound equipment as claimed in claim 5, it is characterized in that, described second earthed switch unit also comprises: the second electric capacity and the second resistance, the first end of described second electric capacity is connected with the four-input terminal of described audio frequency power amplifier module through described second resistance, and the second end of described second electric capacity is connected with the drain electrode of described 2nd N channel enhancement field effect transistor.
7. the audio signal input pattern commutation circuit of the sound equipment as described in claim 1 ~ 6 any one, it is characterized in that, described audio signal input pattern commutation circuit also comprises for filtering low frequency signal with the filtration module avoiding low frequency signal to enter into described audio frequency power amplifier module, and described filtration module is located at described audio frequency power amplifier module and described Bluetooth audio frequency interface, between audio frequency power amplifier module and described AUX interface.
8. the audio signal input pattern commutation circuit of sound equipment as claimed in claim 7, it is characterized in that, described filtration module comprises the 3rd electric capacity and the 3rd resistance, the first end of described 3rd electric capacity is connected with described audio frequency power amplifier module through described 3rd resistance, and the second end of described 3rd electric capacity is connected with described Bluetooth audio frequency interface or AUX interface.
9. the audio signal input pattern commutation circuit of the sound equipment as described in claim 1 ~ 6 any one, it is characterized in that, described detection module comprises: triode, the 4th electric capacity, the 4th resistance, the 5th resistance, the 6th resistance and the 7th resistance; Described AUX interface also comprises the connection signal output of the output low level when it is connected with described AUX source of sound; The base stage of described triode is connected with the connection signal output of described AUX interface through described 4th resistance, the emitter of described triode is connected with external dc power, and the emitter of described triode is through described 5th resistance, the 4th capacity earth, the collector electrode of described triode is through described 6th resistance, the 7th grounding through resistance; Node between described 6th resistance and described 7th resistance is as the detection signal output of described detection module.
10. a sound equipment, is characterized in that, comprises the audio signal input pattern commutation circuit of the sound equipment as described in claim 1 to 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520871704.6U CN205081950U (en) | 2015-11-02 | 2015-11-02 | Audio signal input mode switching circuit and stereo set of stereo set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520871704.6U CN205081950U (en) | 2015-11-02 | 2015-11-02 | Audio signal input mode switching circuit and stereo set of stereo set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205081950U true CN205081950U (en) | 2016-03-09 |
Family
ID=55434320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520871704.6U Active CN205081950U (en) | 2015-11-02 | 2015-11-02 | Audio signal input mode switching circuit and stereo set of stereo set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205081950U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106375923A (en) * | 2016-08-30 | 2017-02-01 | 歌尔科技有限公司 | Detection circuit for audio input signals |
| CN106849002A (en) * | 2017-02-28 | 2017-06-13 | 广东欧珀移动通信有限公司 | Voltage protection circuit and terminal device |
| CN114125615A (en) * | 2022-01-25 | 2022-03-01 | 湖北芯擎科技有限公司 | Vehicle-mounted interface data processing system and method and vehicle-mounted equipment |
| CN114567848A (en) * | 2022-01-26 | 2022-05-31 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
-
2015
- 2015-11-02 CN CN201520871704.6U patent/CN205081950U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106375923A (en) * | 2016-08-30 | 2017-02-01 | 歌尔科技有限公司 | Detection circuit for audio input signals |
| CN106375923B (en) * | 2016-08-30 | 2021-12-31 | 歌尔科技有限公司 | Detection circuit of audio input signal |
| CN106849002A (en) * | 2017-02-28 | 2017-06-13 | 广东欧珀移动通信有限公司 | Voltage protection circuit and terminal device |
| CN114125615A (en) * | 2022-01-25 | 2022-03-01 | 湖北芯擎科技有限公司 | Vehicle-mounted interface data processing system and method and vehicle-mounted equipment |
| CN114125615B (en) * | 2022-01-25 | 2022-05-03 | 湖北芯擎科技有限公司 | Vehicle-mounted interface data processing system and method and vehicle-mounted equipment |
| CN114567848A (en) * | 2022-01-26 | 2022-05-31 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
| CN114567848B (en) * | 2022-01-26 | 2024-05-07 | 惠州华阳通用电子有限公司 | Audio output channel state detection device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205081950U (en) | Audio signal input mode switching circuit and stereo set of stereo set | |
| CN102769729B (en) | Television and audio external play control circuit thereof | |
| CN204090123U (en) | Audio output control circuit and audio-frequence player device | |
| CN104615053B (en) | A kind of transistor controls type electronic load control circuit | |
| CN103297894A (en) | Earphone power amplifier, working method and mobile terminal equipment | |
| CN203800893U (en) | Current-mode audio frequency amplifier | |
| CN104485907A (en) | High-efficiency multimode radio frequency power amplifier | |
| CN103414933B (en) | Analog video signal output device and electronic equipment | |
| CN102710224B (en) | Multimode power amplifier and corresponding mobile communication equipment | |
| CN205793154U (en) | Earphone drive circuit and electronic equipment | |
| CN104348427B (en) | A kind of D class audio frequencies power amplifier, power amplifier and audio playing apparatus | |
| CN212799133U (en) | Elevator control circuit and elevator control system | |
| CN203407000U (en) | Voice output adjustment circuit and audio and video playing equipment | |
| CN200966099Y (en) | Mute circuit for set-top box | |
| CN208796909U (en) | One kind is for the small signal isolation control circuit of relay in number DC converter | |
| CN209358502U (en) | A kind of circuit structure of the harmonics restraint improving amplifier and three rank sections of output | |
| CN201956977U (en) | Audio amplification circuit with improved noise characteristics | |
| CN204408277U (en) | Power amplifier | |
| CN201153249Y (en) | Silencing circuit for start-up and close-down, audio and video apparatus having the circuit | |
| CN204305343U (en) | A kind of speaker protection circuit | |
| CN201601737U (en) | Video amplifying circuit | |
| CN205039780U (en) | Take dual power supply's dual track audio power amplifier circuit | |
| CN102195576A (en) | Audio amplifier working in double modes | |
| CN205829590U (en) | A kind of volume adjusting amplifying circuit | |
| CN204721468U (en) | Audio return signal output apparatus and audio return system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |