CN211959512U - Anti-interference audio output switching control circuit - Google Patents
Anti-interference audio output switching control circuit Download PDFInfo
- Publication number
- CN211959512U CN211959512U CN202020528984.1U CN202020528984U CN211959512U CN 211959512 U CN211959512 U CN 211959512U CN 202020528984 U CN202020528984 U CN 202020528984U CN 211959512 U CN211959512 U CN 211959512U
- Authority
- CN
- China
- Prior art keywords
- audio signal
- audio
- bluetooth chip
- output
- input module
- 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
Images
Landscapes
- Circuit For Audible Band Transducer (AREA)
Abstract
The application belongs to the technical field of audio processing, especially, relate to an audio output switches control circuit, include: the audio signal input module is used for butting an audio line to obtain an audio signal; the Bluetooth chip is used for wirelessly matching an audio source to acquire and output an audio signal; the audio signal output module is respectively butted with the audio signal input module and the Bluetooth chip to obtain audio output; the switch is arranged on a path between the audio signal input module and the audio signal output module or/and a path between the Bluetooth chip and the audio signal output module; the Bluetooth chip is controlled by the Bluetooth chip to realize on/off; and the signal detection circuit is connected between the audio signal input module and the Bluetooth chip and is used for feeding back the audio output of the audio signal input module to the Bluetooth chip. This application control circuit simple structure, but audio signal and the output signal of two kinds of exportable bluetooth and HiFi do not produce between the interference, and the output audio frequency effect is clear.
Description
[ technical field ] A method for producing a semiconductor device
The application belongs to the technical field of audio processing, and particularly relates to an anti-interference audio output switching control circuit.
[ background of the invention ]
The existing Bluetooth headset or HiFi headset has single function, and generally only outputs a single Bluetooth audio signal or HiFi audio signal. Earphones capable of outputting two audio signals also exist in the market, but the switching circuit of the earphones is complex, interference can be generated between the two audio signals, and the output audio effect is not clear enough.
[ summary of the invention ]
To prior art's not enough, this application provides an jam-proof audio output switches control circuit, and this control circuit simple structure can not produce between the audio signal of two kinds of exportable bluetooth and HiFi and the output signal and interfere, and the output audio effect is clear.
The technical scheme adopted for solving the technical problem is as follows:
anti-interference audio output switching control circuit, characterized by comprising:
the audio signal input module is used for butting an audio line to obtain an audio signal;
the Bluetooth chip is used for wirelessly matching an audio source to acquire and output an audio signal;
the audio signal output module is respectively butted with the audio signal input module and the Bluetooth chip to obtain audio output;
the switch is arranged on a path between the audio signal input module and the audio signal output module or/and a path between the Bluetooth chip and the audio signal output module; the Bluetooth chip is controlled by the Bluetooth chip to realize on/off; and
and the signal detection circuit is connected between the audio signal input module and the Bluetooth chip and is used for feeding back the audio output of the audio signal input module to the Bluetooth chip.
In the anti-interference audio output switching control circuit, the switch is a normally closed switch, is arranged on a path between the audio signal input module and the audio signal output module, and is disconnected when the bluetooth chip outputs the audio signal.
The anti-interference audio output switching control circuit comprises a triode Q1, capacitors C1 and C2, and resistors R3 and R6; the capacitor C1 is connected between the collector of the triode Q1 and the detection end of the Bluetooth chip, the emitter of the triode Q1 is grounded, the capacitor C2, the resistors R3 and R6 are connected in series between the output end of the audio signal input module and the ground end, and the connecting point of the resistors R3 and R6 is connected with the base of the triode Q1.
The anti-interference audio output switching control circuit is characterized in that the signal detection circuit is further provided with a voltage bias circuit, the voltage bias circuit comprises resistors R1 and R2 which are connected in series, one end of the voltage bias circuit is connected with a power supply end, the other end of the voltage bias circuit is connected with a base electrode of a triode Q1, and a connecting point of the resistors R1 and R2 is connected with a collector electrode of the triode Q1.
In the anti-interference audio output switching control circuit, the detection end of the bluetooth chip is grounded through the resistor R4.
Compared with the prior art, the anti-interference audio output switching control circuit has the advantages that the switch is arranged on a path between the output end of the audio signal input module and the input end of the audio signal output module, the switch is controlled by the Bluetooth chip to realize on/off between the audio signal input module and the audio signal output module, and the signal detection circuit is connected between the audio signal input module and the Bluetooth chip and used for feeding back audio output of the audio signal input module to the Bluetooth chip. The control circuit is simple in structure, when the Bluetooth audio signals are normally output, the Bluetooth chip controls the switch to be switched off, and the audio signal input module does not have HiFi audio signal input; if control circuit detects the input of HiFi audio signal when the bluetooth is normal use, then can respond to the HiFi signal by priority, close the bluetooth and export HiFi audio signal, can not produce the interference between two audio output signal through this circuit is effectively guaranteed, and the output audio effect is clear.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of an anti-interference audio output switching control circuit according to the present application;
fig. 2 is a circuit schematic diagram of the interference-proof audio output switching control circuit of the present application.
[ detailed description ] embodiments
The present application will be further described with reference to the following drawings and specific embodiments.
Referring to fig. 1, an anti-interference audio output switching control circuit includes an audio signal input module, a bluetooth chip, an audio signal output module, a switch and a signal detection circuit. The audio signal input module is used for butting an audio line to obtain an audio signal; the Bluetooth chip is used for wirelessly matching an audio source to acquire and output an audio signal; the audio signal output module is respectively connected with the audio signal input module and the Bluetooth chip in a butt joint mode to obtain audio output; the switch is arranged on a path between the audio signal input module and the audio signal output module or/and a path between the Bluetooth chip and the audio signal output module; the Bluetooth chip is controlled by the Bluetooth chip to realize on/off; the signal detection circuit is connected between the audio signal input module and the Bluetooth chip and used for feeding back the audio output of the audio signal input module to the Bluetooth chip.
According to the embodiment of the application, when the Bluetooth audio signal is normally output, the Bluetooth chip controls the switch to be switched off, and the audio signal input module does not have HiFi audio signal input; if control circuit detects the input of HiFi audio signal when the bluetooth is normal use, then can respond to the HiFi signal by priority, close the bluetooth and export HiFi audio signal, can not produce the interference between two audio output signal through this circuit is effectively guaranteed, and the output audio effect is clear.
Further, in this embodiment, the switch is a normally closed switch, which is disposed on a path between the audio signal input module and the audio signal output module and is turned off when the bluetooth chip outputs the audio signal. The Bluetooth headset has the advantages that when the Bluetooth headset is powered off, the normally closed switch is closed, and a HiFi data line is inserted to normally output a HiFi audio signal without being influenced by a headset power supply; once the input of the HiFi signal is detected, the Bluetooth connection can be automatically disconnected, the switch is closed, the HiFi audio signal is output in response, and the audio signals of two different types can be alternately played through the on-off of the switch.
The signal detection circuit comprises a triode Q1, capacitors C1 and C2, and resistors R3 and R6; the capacitor C1 is connected between the collector of the triode Q1 and the detection end of the Bluetooth chip, the emitter of the triode Q1 is grounded, the capacitor C2, the resistors R3 and R6 are connected in series between the output end of the audio signal input module and the ground end, the connection point of the resistors R3 and R6 is connected with the base of the triode Q1, and the detection end of the Bluetooth chip is grounded through the resistor R4. The signal detection circuit continuously samples the audio signal input by the audio signal input module, and outputs the audio signal to the Bluetooth chip once the audio signal is detected to reach a certain set threshold value, the Bluetooth chip judges that the HiFi audio signal is input, the Bluetooth is automatically disconnected, and the HiFi audio signal is output.
Referring to fig. 2, the circuit diagram is an embodiment of the present application, in this embodiment, when a HiFi audio signal is input, the HiFi audio signal is amplified by a transistor Q1, capacitively coupled by a capacitor C1, and limited by a resistor R4, and the amplitude reaches above 0.7VPP, the bluetooth chip determines that the HiFi audio signal is input, so as to stop the bluetooth operation, and closes a switch SW to switch a control circuit to a HiFi signal input operation state, and preferentially responds and outputs the HiFi audio signal. This embodiment need not to increase in addition and detects the circuit, simple structure, and the switch switches conveniently, simplifies the functional practicality.
The signal detection circuit is also provided with a voltage bias circuit, the voltage bias circuit comprises resistors R1 and R2 which are connected in series, one end of the voltage bias circuit is connected with a power supply end, the other end of the voltage bias circuit is connected with the base electrode of the triode Q1, and the connecting point of the resistors R1 and R2 is connected with the collector electrode of the triode Q1. The triode Q1 is ensured to work in an amplifying state, the audio signal is amplified, and the audio signal with a high voltage value can be output only through the amplifying processing of the biasing circuit when the audio signal with a low voltage value is input.
In conclusion, the anti-interference audio output switching control circuit has the advantages that the switch is arranged on the path between the output end of the audio signal input module and the input end of the audio signal output module, the switch is controlled by the Bluetooth chip to realize on/off between the audio signal input module and the audio signal output module, and the signal detection circuit is connected between the audio signal input module and the Bluetooth chip and used for feeding back the audio output of the audio signal input module to the Bluetooth chip. The control circuit is simple in structure, when the Bluetooth audio signals are normally output, the Bluetooth chip controls the switch to be switched off, and the audio signal input module does not have HiFi audio signal input; if control circuit detects the input of HiFi audio signal when the bluetooth is normal use, then can respond to the HiFi signal by priority, close the bluetooth and export HiFi audio signal, can not produce the interference between two audio output signal through this circuit is effectively guaranteed, and the output audio effect is clear.
The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not intended to limit the scope of the present application, which is within the scope of the present application, except that the same or similar principles and basic structures as the present application may be used.
Claims (5)
1. Anti-interference audio output switching control circuit, characterized by comprising:
the audio signal input module is used for butting an audio line to obtain an audio signal;
the Bluetooth chip is used for wirelessly matching an audio source to acquire and output an audio signal;
the audio signal output module is respectively butted with the audio signal input module and the Bluetooth chip to obtain audio output;
the switch is arranged on a path between the audio signal input module and the audio signal output module or/and a path between the Bluetooth chip and the audio signal output module; the Bluetooth chip is controlled by the Bluetooth chip to realize on/off; and
and the signal detection circuit is connected between the audio signal input module and the Bluetooth chip and is used for feeding back the audio output of the audio signal input module to the Bluetooth chip.
2. The tamper-proof audio output switching control circuit of claim 1, wherein: the change-over switch is a normally closed switch, is arranged on a path between the audio signal input module and the audio signal output module, and is disconnected when the Bluetooth chip outputs.
3. The tamper-proof audio output switching control circuit of claim 1, wherein: the signal detection circuit comprises a triode Q1, capacitors C1 and C2, and resistors R3 and R6; the capacitor C1 is connected between the collector of the triode Q1 and the detection end of the Bluetooth chip, the emitter of the triode Q1 is grounded, the capacitor C2, the resistors R3 and R6 are connected in series between the output end of the audio signal input module and the ground end, and the connecting point of the resistors R3 and R6 is connected with the base of the triode Q1.
4. The tamper-proof audio output switching control circuit of claim 3, wherein: the signal detection circuit is also provided with a voltage bias circuit, the voltage bias circuit comprises resistors R1 and R2 which are connected in series, one end of the voltage bias circuit is connected with a power supply end, the other end of the voltage bias circuit is connected with the base electrode of the triode Q1, and the connecting point of the resistors R1 and R2 is connected with the collector electrode of the triode Q1.
5. The tamper-proof audio output switching control circuit of claim 3, wherein: the detection end of the Bluetooth chip is grounded through a resistor R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020528984.1U CN211959512U (en) | 2020-04-11 | 2020-04-11 | Anti-interference audio output switching control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020528984.1U CN211959512U (en) | 2020-04-11 | 2020-04-11 | Anti-interference audio output switching control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211959512U true CN211959512U (en) | 2020-11-17 |
Family
ID=73161473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020528984.1U Active CN211959512U (en) | 2020-04-11 | 2020-04-11 | Anti-interference audio output switching control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211959512U (en) |
-
2020
- 2020-04-11 CN CN202020528984.1U patent/CN211959512U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5014017A (en) | Power-saving low-frequency power amplifier | |
| EP0317271A3 (en) | Method and apparatus for coupling an ecl output signal using a clamped capacitive bootstrap circuit | |
| US8335322B2 (en) | Mute control circuit and electronic device using same | |
| CN211959512U (en) | Anti-interference audio output switching control circuit | |
| MY126916A (en) | High-frequency amplifier circuit with negative impedance cancellation | |
| CN111447529A (en) | Anti-interference audio output switching control circuit | |
| JP2681001B2 (en) | Comparator circuit | |
| CN211959510U (en) | Audio output switching control circuit | |
| CN211959511U (en) | Bluetooth audio output switching control circuit | |
| US6812740B2 (en) | Low-voltage drive circuit and method for the same | |
| KR100415610B1 (en) | Apparatus for changing automatically input sensitivity of microphone | |
| CN217486604U (en) | Digital voltage power amplifier circuit | |
| CN216795284U (en) | Earphone insertion detection and model identification circuit, chip, module, adapter and electronic equipment | |
| JPH0649033Y2 (en) | Remote control signal processing circuit | |
| CN109756824B (en) | Circuit and method for realizing automatic switching of vehicle-mounted external audio channel | |
| JPH0989944A (en) | Wind comparator | |
| CN2901696Y (en) | Inductive load driving circuit | |
| JP3902094B2 (en) | amplifier | |
| JPS58154908A (en) | Electronic device | |
| CN106375923B (en) | Detection circuit of audio input signal | |
| CN111900933A (en) | Automatic power on/off circuit of power amplifier | |
| JP2762333B2 (en) | Amplifier circuit and signal amplifier IC | |
| JPH046255Y2 (en) | ||
| JPH0345568B2 (en) | ||
| JP2586732B2 (en) | Detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 3 / F, No.13, Maonan Road, Torch Development Zone, Zhongshan City, Guangdong Province 528400 Patentee after: Tianjian medical technology (Guangdong) Co.,Ltd. Address before: 3 / F, No.13, Maonan Road, Torch Development Zone, Zhongshan City, Guangdong Province 528400 Patentee before: ZHONGSHAN TIANJIAN COMMUNICATION TECHNOLOGY Co.,Ltd. |