CN217363306U - From taking speaker and external speaker control switching circuit - Google Patents
From taking speaker and external speaker control switching circuit Download PDFInfo
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- CN217363306U CN217363306U CN202221163948.5U CN202221163948U CN217363306U CN 217363306 U CN217363306 U CN 217363306U CN 202221163948 U CN202221163948 U CN 202221163948U CN 217363306 U CN217363306 U CN 217363306U
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Abstract
The utility model provides a from taking speaker and external speaker control switching circuit belongs to the electronic circuit field. The utility model discloses an audio playback switching unit, from taking speaker on-off control unit, audio amplification unit, wherein, audio playback switching unit's input and the input from taking speaker on-off control unit link to each other with master control broadcast control output respectively, audio playback switching unit's first output with audio amplification unit's input links to each other, audio playback switching unit's second output links to each other with external speaker interface, audio amplification unit's output with link to each other from taking speaker interface, audio amplification unit's control end with link to each other from taking speaker on-off control unit's output. The utility model has the advantages that: according to the requirement, two output paths are switched to meet the requirement of a user.
Description
Technical Field
The utility model relates to an audio playback technical field, concretely relates to from taking speaker and external speaker control switching circuit.
Background
Traditional intelligence well accuse is generally for the built-in speaker from area, broadcast sound is little, if want to satisfy the front-end market, the good music of listening quality, just need to connect wired loudspeaker, but, when having connected wired loudspeaker outward, the audio frequency generally all broadcasts through external speaker, because the loudspeaker volume is great in some use scenes, or at night, especially under the quiet environment at night, can be awaken up by external speaker suddenly, influence the rest, consequently, need set up a control switching circuit, satisfy the user demand.
SUMMERY OF THE UTILITY MODEL
For solving the problem among the prior art, the utility model provides a from taking speaker and external speaker control switching circuit.
The utility model relates to a from taking speaker and external speaker control switching circuit, including audio playback switching element, from taking speaker on-off control unit, audio amplification unit, wherein, audio playback switching element's input and from taking speaker on-off control unit's input link to each other with master control broadcast control output respectively, audio playback switching element's first output with audio amplification unit's input links to each other, audio playback switching element's second output links to each other with external speaker interface, audio amplification unit's output links to each other with from taking the speaker interface, audio amplification unit's control end with link to each other from taking speaker on-off control unit's output.
The utility model discloses do further improvement, still include the silence unit, the control end of silence unit with master control broadcast control output links to each other, the input of silence unit links to each other with the silence control foot that the master control is used for exporting the silence signal, and the silence pin of the external speaker interface of output termination.
The utility model discloses do further improvement, the silence unit includes triode Q8, triode Q8's base links to each other with the broadcast control output of master control, and the projecting pole connects the silence pin of external speaker interface, and the collecting electrode connects the silence control foot of master control.
The utility model discloses do further improvement, still include mirror image silence unit, the control termination of mirror image silence unit is from taking speaker on-off control unit's output, the input of mirror image silence unit links to each other with the silence control foot that the master control is used for exporting the silence signal, and the control end of output termination audio amplification unit, the control end of audio amplification unit passes through mirror image silence unit connects from taking speaker on-off control unit.
The utility model discloses do further improvement, mirror image silence unit includes triode Q6, triode Q6's base links to each other with the output from taking speaker on-off control unit, and the projecting pole connects the control end that connects the audio frequency amplification unit, and the collecting electrode connects the silence control foot of master control.
The utility model discloses make further improvement, still include signal amplification unit, signal amplification unit sets up between silence mirror image unit and the audio amplification unit.
The utility model discloses make further improvement, the signal amplification unit includes the enlarged triode of establishing ties more than the one-level.
The utility model discloses make further improvement, chip U4 is switched including the broadcast to audio playback switching unit, chip U4 is switched in the broadcast and is equipped with an audio input and two audio frequency switch outputs, realizes different outputs through switching, and the broadcast switches chip U4's pin 1 and links to each other with the broadcast control output of master control.
The utility model discloses make further improvement, still include sound source input control unit, sound source input control unit includes:
the system comprises more than two input ends, a signal processing module and a signal processing module, wherein the more than two input ends are used for receiving sound source inputs of different paths;
an audio output terminal: and the audio playing switching unit is connected with the input end of the audio playing switching unit and is used for outputting audio signals to the audio playing switching unit.
The utility model is further improved, the sound source input control unit adopts an audio control chip for identifying multi-path sound source input or an audio switching chip U10 for switching internal audio and external audio signals,
when the audio source input control unit adopts the audio switching chip U10, the pin 2 and the pin 8 of the audio switching chip U10 are first input pins, an internal audio source signal of the input device, the pins 3 and 7 of the audio switching chip U10 are second input pins, and are connected to an external audio input interface, and an external audio signal is input, the pins 4 and 6 are output pins, and are connected to the audio playing switching unit, and the pin 1 is a control terminal, and is connected to the master controller.
Compared with the prior art, the beneficial effects of the utility model are that: connect simultaneously when taking speaker and external speaker when equipment, can switch the broadcast route at any time according to the demand, can satisfy the tone quality demand as background music, and as daily warning function of awakening up, avoid awakening up suddenly under night or the quiet environment, thereby influence the situation of rest, furthermore, the silence circuit design, tone quality can further be improved, no matter play audio signal through which kind of route, another kind of route is the silence and does not start the state, the noise interference phenomenon of the route of the other way has been avoided, tone quality is purer.
Drawings
In order to illustrate the present application or prior art more clearly, a brief description of the drawings needed for the description of the embodiments or prior art will be given below, it being clear that the drawings in the following description are some embodiments of the present application and that other drawings can be derived from them by a person skilled in the art without inventive effort.
FIG. 1 is a block diagram of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the sound source input control unit of the present invention;
fig. 3 is a schematic circuit diagram of an embodiment of the audio playback switching unit of the present invention;
fig. 4 is a schematic circuit diagram of the switch control unit with a speaker, the mirror image mute unit, the signal amplification unit and the audio amplification unit of the present invention;
fig. 5 is a schematic diagram of a mute unit circuit according to the present invention.
Fig. 6 is a schematic diagram of the external speaker interface circuit of the present invention.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
The utility model discloses be applied to and be equipped with built-in speaker and can external speaker's equipment, for example: intelligent central control, intelligent equipment such as mobile phones, audio playing equipment and the like. The present example is described by taking an intelligent central control with a music bottom shell as an example.
The music bottom shell of the embodiment is provided with more than 1 external loudspeaker interface which is externally connected with a loudspeaker, so that the external loudspeaker can be externally connected, and the requirement of tone quality for playing background music is met. In addition, an intelligent central control mainboard is arranged in the equipment, and a main control and a built-in loudspeaker are arranged on the intelligent central control mainboard. The utility model discloses from taking speaker and external speaker control switching circuit (for short control switching circuit) to set up equally on the accuse mainboard in the intelligence.
As shown in fig. 1, the control switching circuit of this example includes:
sound source input control means: the audio switching unit is provided with more than two input ends for receiving sound source inputs of different paths and an audio output end, wherein the audio output end is connected with the input end of the audio playing switching unit and used for outputting audio signals to the audio playing switching unit. The energy sound source input control unit is mainly used for switching the input of an internal sound source and an external sound source;
an audio playback switching unit: the main control controls the audio playing switching, and the audio playing switching is provided with two output ends, wherein the first output end outputs audio signals to the built-in loudspeaker for playing, and the second output end outputs audio signals to the external loudspeaker for playing;
an audio amplification unit: the input end of the audio amplification unit is connected with the first output end of the audio playing switching unit, the output end of the audio amplification unit is connected with the self-contained loudspeaker interface, and the control end of the audio amplification unit is connected with the output end of the self-contained loudspeaker switch control unit;
the switch control unit with the loudspeaker comprises: the audio amplifying unit is used for controlling the on or off of the audio amplifying unit;
a mute mirroring unit: the control end of the image mute unit is connected with the output end of the switch control unit with the loudspeaker, the input end of the image mute unit is connected with a main control mute control pin for outputting a mute signal, the output end of the image mute unit is connected with the control end of the audio amplification unit, and the control end of the audio amplification unit is connected with the switch control unit with the loudspeaker through the image mute unit;
a signal amplification unit: the mute mirror image unit is arranged between the mute mirror image unit and the audio amplification unit and is used for amplifying the input control signal and outputting the amplified control signal to the audio amplification unit;
a mute unit: the control end of the mute unit is connected with the main control play control output end, the input end of the mute unit is connected with a mute control pin used for outputting a mute signal by the main control, and the output end of the mute unit is connected with a mute pin of an external loudspeaker interface.
As shown in fig. 2, the sound source input control unit of the present invention employs an audio switching chip U10 for switching the internal audio signal and the external audio signal,
when the audio source input control unit adopts the audio switching chip U10, the pin 2 and the pin 8 of the audio switching chip U10 are first input pins, an internal audio source signal of the input device, the pins 3 and 7 of the audio switching chip U10 are second input pins, the external audio source signal is input through an external audio input interface, the pins 4 and 6 are output pins, the audio play switching unit is connected, the pin 1 is a control terminal and is connected with a master controller, and a control signal AUX _ TO of the master controller outputs high and low levels through the triode Q2, so that the switching of the first input pin and the second input pin of the audio switching chip U10 is controlled.
In addition to the above two-way input, the present embodiment may also use an audio control chip capable of identifying multiple sound source inputs, for example, a bluetooth chip capable of identifying input ends for inputting bluetooth and USB interface signals, an audio processing chip capable of processing other audio signals, etc., and an internal processor of the audio processing chip automatically identifies, processes, and outputs a sound source.
As shown in fig. 3, the audio playing switching unit of this embodiment employs a playing switching chip U4, the playing switching chip U4 is provided with an audio input terminal and two audio switching output terminals, wherein pins 4 and 6 are audio input terminals, pin 2 and pin 8 constitute a first output terminal, pins 3 and 7 constitute a second output terminal, different outputs are realized by switching, and pin 1 of the playing switching chip U4 is connected to the master control playing control output terminal LM 4871.
As shown in fig. 4, the switch control unit of the self-contained speaker of this embodiment includes a transistor Q7, the image muting unit includes a transistor Q6, the signal amplification unit includes a transistor Q3, and a multi-stage transistor series connection may also be adopted, and the image muting unit may also be directly connected to the audio amplification unit without a transistor.
Specifically, the base of the triode Q7 is connected with a master control play control output end LM4871 (master control IO port), the emitter is grounded, the collector is connected with a power supply and one end of a resistor R43, respectively, the base of the triode Q6 is connected with the other end of the resistor R43, the emitter is connected with the triode Q3 through a resistor R76, the collector of the triode Q6 is connected with a master control mute control pin GPIO3_ a4, the collector of the triode Q3 is connected with the power supply through a resistor R48, the transmitter is grounded, and meanwhile, the collector is connected with the control end of the audio amplification unit through a capacitor C60.
The audio amplifying unit adopts an audio power amplifying tube U11, a pin 2 and a pin 8 of the audio power amplifying tube U11 are connected with a built-in loudspeaker interface, and an audio signal is output or closed to be output to the built-in loudspeaker through the control of the pin 2.
As shown in fig. 5 and fig. 6, the external speaker of this embodiment may be provided in multiple numbers, so as to achieve the desired playing effect, the MUTE unit of this embodiment includes a transistor Q8, a base of the transistor Q8 is connected to the master control playing control output LM4871 (master control IO port), an emitter is connected to the MUTE pin MUTE of the external speaker interface, and a collector is connected to the master control MUTE control pin GPIO3_ a 4.
The mute control circuit has the advantages that the circuit is simple, and the mute control switching of each audio playing can be skillfully realized through the play control output end of the main control and one mute control pin. The utility model discloses no matter what kind of route broadcast audio signal, another kind of route is the silence and does not start the state, has avoided the noise interference phenomenon of route all the way in addition, and tone quality is purer.
The utility model discloses a theory of operation does:
when an external sound source or an internal sound source is output, a master control output control signal is transmitted to a pin 1 of an audio switching chip U10, the audio switching chip U10 is controlled to conduct a corresponding path, then an audio signal is output to an audio playing switching unit, a playing switching chip U11 of the audio playing switching unit switches an output channel according to an LM4871 (master control IO port) playing control signal of a master control module, if the output channel is in a high level, the playing control chip U4 is controlled to be switched to a built-in loudspeaker playing channel of pins 2 and 8, at the moment, a triode Q7 is not conducted, a triode Q6 is conducted in a high level, and because a mute control pin GPIO3_ A4 of the master control is always in a high level when the device is in a playing or broadcasting working state, the triode Q3 is conducted in the high level, the high level signal is input to a pin 2 of a power amplification chip U11, the audio power amplification tube U11 starts to work, and outputs the amplified audio signal, and then output to the built-in speaker of the subsequent stage through pins 5 and 8.
Meanwhile, the base of the triode Q8 of the mute processing unit is switched on at a high level, and a main control mute signal is output to the mute pin of the external speaker interface through the mute control pin GPIO3_ a4 to control the external speaker interface to mute, so that the external speaker interface does not have any signal output, and the interference to the tone quality of the internal speaker is avoided.
If the master control LM4871 (master control IO port) playing control signal is at low level, the control playing control chip U4 switches to the external speaker playing channels of pins 3 and 7, at this time, the triode Q7 is turned on at low level, the triode Q6 is turned off at low level, the triode Q3 is turned off at low level, no level signal is input to pin 2 of the audio power amplifier tube U11, and the audio power amplifier tube U11 does not work.
Meanwhile, the base of the triode Q8 of the mute processing unit is in a low level non-conduction state, and a mute signal of the main control module cannot be output to a mute pin of the external loudspeaker interface, so that audio can be played through the external loudspeaker.
The utility model discloses also can be through the control of the broadcast control pin LM4871 (master control IO mouth) of master control whether audio signal broadcasts to control broadcast control chip U4, if for the low level, then external speaker and built-in speaker all do not have audio signal output.
Compared with the prior art, the beneficial effects of the utility model are that: when equipment connects from taking speaker and external speaker simultaneously, can switch the broadcast route at any time according to the demand, can satisfy the tone quality demand as background music, and as daily warning function of awakening up the function, avoid awakening up suddenly under night or the quiet environment to the situation of influence rest.
The above-mentioned embodiments are preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, and the scope of the present invention includes but is not limited to the above-mentioned embodiments, and all equivalent changes made according to the present invention are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a from taking speaker and external speaker control switching circuit which characterized in that: the control device comprises an audio playing switching unit, a self-contained loudspeaker switch control unit and an audio amplification unit, wherein the input end of the audio playing switching unit and the input end of the self-contained loudspeaker switch control unit are respectively connected with a master control playing control output end, the first output end of the audio playing switching unit is connected with the input end of the audio amplification unit, the second output end of the audio playing switching unit is connected with an external loudspeaker interface, the output end of the audio amplification unit is connected with the self-contained loudspeaker interface, and the control end of the audio amplification unit is connected with the output end of the self-contained loudspeaker switch control unit.
2. The self-contained speaker and external speaker control switching circuit according to claim 1, wherein: the control end of the mute unit is connected with the master control play control output end, the input end of the mute unit is connected with a mute control pin used for outputting a mute signal by the master control, and the output end of the mute unit is connected with a mute pin of an external loudspeaker interface.
3. The self-contained speaker and external speaker control switching circuit according to claim 2, wherein: the mute unit comprises a triode Q8, the base of the triode Q8 is connected with the play control output end of the master control, the emitter is connected with the mute pin of the external loudspeaker interface, and the collector is connected with the mute control pin of the master control.
4. The self-contained speaker and external speaker control switching circuit as defined in claim 2, wherein: still include mirror image silence unit, the control end of mirror image silence unit is from the output of taking speaker on-off control unit, the input of mirror image silence unit links to each other with the silence control foot that the master control is used for exporting the silence signal, and the control end of output termination audio amplification unit, the control end of audio amplification unit passes through mirror image silence unit connects from taking speaker on-off control unit.
5. The self-contained speaker and external speaker control switching circuit according to claim 4, wherein: the mirror image mute unit comprises a triode Q6, the base of the triode Q6 is connected with the output end of the switch control unit with the loudspeaker, the emitter is connected with the control end of the audio amplification unit, and the collector is connected with the mute control pin of the master control.
6. The self-contained speaker and external speaker control switching circuit according to claim 5, wherein: the image mute unit is arranged between the image mute unit and the audio amplification unit.
7. The self-contained speaker and external speaker control switching circuit as defined in claim 6, wherein: the signal amplification unit comprises more than one stage of amplification triodes which are connected in series.
8. The self-contained speaker and external speaker control switching circuit as defined in any one of claims 1-7, wherein: the audio playing switching unit comprises a playing switching chip U4, the playing switching chip U4 is provided with an audio input end and two audio switching output ends, different outputs are achieved through switching, and a pin 1 of the playing switching chip U4 is connected with a main control playing control output end.
9. The self-contained speaker and external speaker control switching circuit as defined in any one of claims 1 to 7, wherein: still include audio source input control unit, audio source input control unit includes:
more than two input ends for receiving sound source inputs of different paths;
an audio output terminal: and the audio playing switching unit is connected with the input end of the audio playing switching unit and used for outputting audio signals to the audio playing switching unit.
10. The self-contained speaker and external speaker control switching circuit as defined in claim 9, wherein: the sound source input control unit employs an audio control chip that recognizes a multi-channel sound source input or an audio switching chip U10 that switches internal audio and external audio signals,
when the audio source input control unit adopts the audio switching chip U10, the pin 2 and the pin 8 of the audio switching chip U10 are first input pins, an internal audio source signal of the input device, the pins 3 and 7 of the audio switching chip U10 are second input pins, and are connected to an external audio input interface, and an external audio signal is input, the pins 4 and 6 are output pins, and are connected to the audio playing switching unit, and the pin 1 is a control terminal, and is connected to the master controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221163948.5U CN217363306U (en) | 2022-05-14 | 2022-05-14 | From taking speaker and external speaker control switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221163948.5U CN217363306U (en) | 2022-05-14 | 2022-05-14 | From taking speaker and external speaker control switching circuit |
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| Publication Number | Publication Date |
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| CN217363306U true CN217363306U (en) | 2022-09-02 |
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| CN202221163948.5U Active CN217363306U (en) | 2022-05-14 | 2022-05-14 | From taking speaker and external speaker control switching circuit |
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| CN (1) | CN217363306U (en) |
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- 2022-05-14 CN CN202221163948.5U patent/CN217363306U/en active Active
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