CN106792358B - Audio control system and audio system - Google Patents
Audio control system and audio system Download PDFInfo
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- CN106792358B CN106792358B CN201710011122.4A CN201710011122A CN106792358B CN 106792358 B CN106792358 B CN 106792358B CN 201710011122 A CN201710011122 A CN 201710011122A CN 106792358 B CN106792358 B CN 106792358B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
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- Engineering & Computer Science (AREA)
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Abstract
An audio control system and an audio system. Wherein the audio processor is adapted to provide an audio control signal, a first audio signal and a second audio signal; the audio channel selection unit is suitable for outputting a first control signal to the audio power amplification unit and outputting a second control signal to the analog switch unit according to the audio control signal, sending the first audio signal to the audio power amplification unit when the first control signal is a starting signal, and sending the first audio signal and the second audio signal to the analog switch unit when the second control signal is a starting signal; the audio power amplification unit is suitable for amplifying the first audio signal and outputting the amplified first audio signal to the output end of the audio power amplification unit when the received first control signal is a starting signal; and the analog switch unit is suitable for outputting the first audio signal and the second audio signal to the output end of the analog switch unit when the received second control signal is a starting signal.
Description
Technical Field
The present invention relates to the field of electronics, and in particular, to an audio control system and an audio system.
Background
The smart phone has more and more integrated functions, and becomes a personal multimedia terminal integrating communication, audio-video entertainment and news information. In the aspect of audio application, users have higher and higher requirements on music, videos, games, radios, broadband voices, high-definition voices and the like, and mobile phone manufacturers have stronger and stronger competition, and pay more and more attention to design and improvement on the aspect of audio, and various differentiated audio schemes are proposed. In the audio system of the smart phone, a plurality of audio application modes exist, including application scenes such as incoming call ringing, music listening, FM (frequency modulation) broadcast listening, hands-free conversation and the like, in the application scenes, an earphone passage and an external audio power amplifier passage need to be opened independently or simultaneously, and in the audio system of the smart phone, the input end of the external audio power amplifier shares a left sound channel and a right sound channel of the earphone passage, so that a control chip and an external component need to be additionally arranged to meet the plurality of audio application modes, a board distribution space is occupied, and the design cost is increased.
Disclosure of Invention
The problem solved by the invention is how to reduce the design cost of an audio system.
To solve the above problems, the present invention provides an audio control system, comprising: the audio power amplifier comprises an audio channel selection unit, an audio power amplification unit and an analog switch unit. The audio processor is adapted to provide an audio control signal, a first audio signal and a second audio signal. The audio channel selection unit is suitable for outputting a first control signal to the audio power amplification unit and outputting a second control signal to the analog switch unit according to the audio control signal, sending the first audio signal to the audio power amplification unit when the first control signal is an opening signal, and sending the first audio signal and the second audio signal to the analog switch unit when the second control signal is an opening signal. The audio power amplifying unit is suitable for amplifying the first audio signal and outputting the amplified first audio signal to the output end of the audio power amplifying unit when the received first control signal is a starting signal. The analog switch unit is suitable for outputting the first audio signal and the second audio signal to an output end of the analog switch unit when the received second control signal is a starting signal.
Optionally, the audio power amplifier is implemented by a chip, and the audio path selection unit, the audio power amplification unit, and the analog switch unit are integrated on the chip.
Optionally, one of the first audio signal and the second audio signal is a left channel audio signal, and the other is a right channel audio signal.
Optionally, the audio path selecting unit includes: the device comprises a pulse control unit, a first path selector and a second path selector. The pulse control unit is suitable for outputting the first control signal and the second control signal according to the pulse number of the audio control signal, and starting the first channel selector when the first control signal is a starting signal and starting the first channel selector and the second channel selector when the second control signal is a starting signal. The first path selector is suitable for receiving the first audio signal and sending the first audio signal to the audio power amplification unit after the first path selector is started. The second channel selector is suitable for receiving the second audio signal and sending the second audio signal to the analog switch unit after the second channel selector is started.
Optionally, the analog switch unit includes a first transmission gate, a second transmission gate, a first resistor, a second resistor, and an inverter. The inverter is adapted to provide an inverted signal of the second control signal. The input end of the first transmission gate is suitable for receiving the first audio signal, the output end of the first transmission gate is connected with the first end of the first resistor, the first control end of the first transmission gate is suitable for receiving the second control signal, and the second control end of the first transmission gate is suitable for receiving the inverted signal of the second control signal. The input end of the second transmission gate is suitable for receiving the second audio signal, the output end of the second transmission gate is connected with the first end of the second resistor, the first control end of the second transmission gate is suitable for receiving the second control signal, and the second control end of the second transmission gate is suitable for receiving the inverted signal of the second control signal.
Optionally, the first transmission gate includes a first NMOS transistor and a first PMOS transistor, and the second transmission gate includes a second NMOS transistor and a second PMOS transistor. The drain electrode of the first NMOS tube is connected with the source electrode of the first PMOS tube and the input end of the first transmission gate, the drain electrode source electrode of the first NMOS tube is connected with the drain electrode of the first PMOS tube and the output end of the first transmission gate, the grid electrode of the first NMOS tube is connected with the second control signal, and the grid electrode of the first PMOS tube is connected with the inverted signal of the second control signal. The drain electrode of the second NMOS tube is connected with the source electrode of the second PMOS tube and the input end of the second transmission gate, the drain electrode source electrode of the second NMOS tube is connected with the drain electrode of the second PMOS tube and the output end of the second transmission gate, the grid electrode of the second NMOS tube is connected with the second control signal, and the grid electrode of the second PMOS tube is connected with the inverted signal of the second control signal.
Optionally, the start signal is at a high level.
Optionally, the resistances of the first resistor and the second resistor are equal.
Optionally, the resistance values of the first resistor and the second resistor are both 10 Ω to 12 Ω.
The embodiment of the invention also provides an audio system which comprises a loudspeaker, an earphone socket and the audio control system, wherein the loudspeaker is connected with the output end of the audio power amplification unit, and the earphone socket is connected with the output end of the analog switch unit.
Compared with the prior art, the audio channel selection unit of the audio power amplifier can generate a first control signal and a second control signal according to the audio control signal provided by the audio processor, control the audio power amplification unit to be turned on and off through the first control signal, control the analog switch unit to be turned on and off through the second control signal, and output the first audio signal and the second audio signal provided by the audio processor to the audio power amplification unit and the analog switch unit according to the first control signal and the second control signal. Because the audio channel selection unit has the functions, the audio channel selection unit, the audio power amplification unit and the analog switch unit can be integrated in one audio power amplifier, and other external components are not needed, so that the board distribution space is saved, and the design cost is reduced.
Drawings
FIG. 1 is a schematic diagram of an audio system configuration according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an analog switch unit according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, an embodiment of the present invention provides an audio control system, including: an audio processor 1 and an audio power amplifier 2. The audio power amplifier 2 includes an audio path selection unit 21, an audio power amplification unit 22, and an analog switch unit 23.
The audio processor 1 is adapted to provide an audio control signal, a first audio signal PA _ IN and a second audio signal HP _ IN. The audio processor 1 may output the audio control signal through a general purpose input output interface (GPIO).
The audio path selection unit 21 is adapted to output a first control signal PA and a second control signal HP in dependence of the audio control signal. The first audio signal PA _ IN is sent to the audio power amplifying unit 22 when the first control signal PA is a turn-on signal. The first and second audio signals PA _ IN and HP _ IN are transmitted to the analog switching unit 23 when the second control signal HP is an on signal.
The audio power amplifying unit 22 is adapted to amplify the first audio signal PA _ IN and output the amplified first audio signal PA _ IN to the output end of the audio power amplifying unit 22 when the received first control signal PA is a start signal.
The analog switch unit 23 is adapted to output the first audio signal PA _ IN and the second audio signal HP _ IN to an output terminal of the analog switch unit 23 when the received second control signal HP is an on signal.
IN the present embodiment, the audio path selecting unit 21 of the audio power amplifier 2 may generate the first control signal PA and the second control signal HP according to the audio control signal provided by the audio processor 1, control the audio power amplifying unit 22 to be turned on and off by the first control signal PA, control the analog switching unit 23 to be turned on and off by the second control signal HP, and output the first audio signal PA _ IN and the second audio signal HP _ IN provided by the audio processor 1 to the audio power amplifying unit 22 and the analog switching unit 23 according to the first control signal PA and the second control signal HP. Because the audio channel selection unit 21 has the above functions, the audio channel selection unit 21, the audio power amplification unit 22 and the analog switch unit 23 can be integrated in one audio power amplifier 2 without other external components, thereby saving the board layout space and reducing the design cost.
One of the first audio signal PA _ IN and the second audio signal HP _ IN of the present embodiment may be a left channel audio signal, and the other is a right channel audio signal. For example, the first audio signal PA _ IN is a left channel audio signal, and the second audio signal HP _ IN is a right channel audio signal. The audio processor 1 outputs a first audio signal PA _ IN through a left channel output terminal HP _ L and a second audio signal HP _ IN through a right left channel output terminal HP _ R.
With continued reference to fig. 1, the audio path selection unit 21 may include: a pulse control unit 211, a first path selector 212, and a second path selector 213.
The pulse control unit 211 is adapted to output the first control signal PA and the second control signal HP in dependence of the number of pulses of the audio control signal. The first path selector 212 is turned on when the first control signal PA is an on signal, and the first and second path selectors 213 are turned on when the second control signal HP is an on signal.
The first path selector 212 is adapted to receive the first audio signal PA _ IN and send the first audio signal PA _ IN to the audio power amplifying unit 22 after being turned on.
The second path selector 213 is adapted to receive the second audio signal HP _ IN and send the second audio signal HP _ IN to the analog switch unit 23 after being turned on.
Specifically, the pulse control unit 211 calculates the number of pulses of the audio control signal, and determines which audio application mode to enter according to the number of pulses. The audio application mode may include ringing a phone call, listening to music, listening to FM radio, hands-free calling, etc.
When the pulse control unit 211 determines to enter the ring mode according to the number of pulses, the generated first control signal PA and the second control signal HP are both on signals. The audio power amplifying unit 22 and the analog switch unit 23 both enter an on state after receiving the on signal. Also, the pulse control unit 211 also turns on the first path selector 212 and the second path selector 213, the first path selector 212 transmits the first audio signal PA _ IN to the audio power amplifying unit 22 and the analog switch unit 23, and the second path selector 213 transmits the second audio signal HP _ IN to the analog switch unit 23. This enables a mode in which the speaker and the earphone are simultaneously turned on.
The music listening mode may be to turn on the speaker or the earphone separately, and it is assumed that the pulse control unit 211 determines that the first control signal PA is a turn-off signal and the second control signal HP is a turn-on signal when the earphone music listening mode is entered according to the pulse number. The audio power amplifying unit 22 enters a shutdown mode after receiving the shutdown signal, and the analog switch unit 23 enters an on state after receiving the on signal. Also, the pulse control unit 211 also turns on the first path selector 212 and the second path selector 213, the first path selector 212 transmits the first audio signal PA _ IN to the audio power amplifying unit 22 and the analog switch unit 23, and the second path selector 213 transmits the second audio signal HP _ IN to the analog switch unit 23. However, since the audio power amplifying unit 22 is IN the off mode, the audio power amplifying unit 22 does not output the first audio signal PA _ IN, and the analog switching unit 23 IN the on mode outputs the first audio signal PA _ IN and the second audio signal HP _ IN.
When listening to FM radio, if listening to FM radio with a speaker, it is necessary to use an earphone as an antenna, but it is not necessary for the earphone to have sound. Therefore, when the pulse control unit 211 determines to enter the FM broadcasting listening mode of the speaker according to the number of pulses, the first control signal PA is generated as an on signal, and the second control signal HP is generated as an off signal. The audio power amplifying unit 22 enters an on mode after receiving the on signal, and the analog switch unit 23 enters an off state after receiving the off signal. Also, the pulse control unit 211 turns on the first path selector 212 but turns off the second path selector 213. The first path selector 212 transmits the first audio signal PA _ IN to the audio power amplifying unit 22 and the analog switching unit 23, and the second path selector 213 stops operating. Since the analog switching unit 23 is IN the off mode, the analog switching unit 23 does not output the first audio signal PA _ IN, and the audio power amplifying unit 22 IN the on mode outputs the first audio signal PA _ IN.
In order to integrate the analog switching unit 23 with the audio path selection unit 21 and the audio power amplification unit 22 on the same chip, as shown in fig. 2, the analog switching unit 23 of this embodiment may include a first transmission gate 231, a second transmission gate 232, a first resistor R1, a second resistor R2, and an inverter (not shown).
The inverter is adapted to provide an inverted signal HPN of the second control signal HP.
An input terminal of the first transmission gate 231 is adapted to receive the first audio signal PA _ IN, an output terminal of the first transmission gate 231 is connected to a first terminal of the first resistor R1, a first control terminal of the first transmission gate 231 is adapted to receive the second control signal HP, and a second control terminal of the first transmission gate 231 is adapted to receive an inverted signal HPN of the second control signal.
An input terminal of the second transmission gate 232 is adapted to receive the second audio signal HP _ IN, an output terminal of the second transmission gate 232 is connected to a first terminal of the second resistor R2, a first control terminal of the second transmission gate 232 is adapted to receive the second control signal HP, and a second control terminal of the second transmission gate 232 is adapted to receive an inverted signal HPN of the second control signal.
The first transmission gate 231 includes a first NMOS transistor N0 and a first PMOS transistor P0, and the second transmission gate 232 includes a second NMOS transistor N1 and a second PMOS transistor P1.
The drain of the first NMOS transistor N0 is connected to the source of the first PMOS transistor P0 and the input terminal of the first transmission gate 231, the drain of the first NMOS transistor N0 is connected to the drain of the first PMOS transistor P0 and the output terminal of the first transmission gate 231, the gate of the first NMOS transistor N0 is connected to the second control signal HP, and the gate of the first PMOS transistor is connected to the inverted signal HPN of the second control signal.
The drain of the second NMOS transistor N1 is connected to the source of the second PMOS transistor P1 and the input terminal of the second transmission gate 232, the drain of the second NMOS transistor N1 is connected to the drain of the second PMOS transistor P1 and the output terminal of the second transmission gate 232, the gate of the second NMOS transistor N1 is connected to the second control signal HP, and the gate of the second PMOS transistor P1 is connected to the inverted signal HPN of the second control signal.
The on signal of the first control signal PA may be at a high level, and the off signal may be at a low level. The on signal of the second control signal HP may be at a high level, and the off signal may be at a low level. When the second control signal HP is at a high level, the inverted signal HPN of the second control signal is at a low level, the first transmission gate 231 and the second transmission gate 232 are both IN a conductive state, and the first audio signal PA _ IN and the second audio signal HP _ IN are output through the first transmission gate 231 and the second transmission gate 232, respectively.
The first resistor R1 and the second resistor R2 of the present embodiment can limit the amplitudes of the first audio signal PA _ IN and the second audio signal HP _ IN, and thus achieve the purpose of amplitude limiting. The first resistor R1 and the second resistor R2 may be equal in resistance. Specifically, the resistance values of the first resistor R1 and the second resistor R2 are both 10 Ω to 12 Ω.
Referring to fig. 1, the present embodiment further provides an audio system, which includes a speaker (not shown), an earphone jack (not shown), and the audio control system provided by the above embodiments. Wherein, the speaker is connected with the output end of the audio power amplifying unit 22, and the earphone jack is connected with the output end of the analog switch unit 23.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. An audio control system, comprising: the audio power amplifier comprises an audio channel selection unit, an audio power amplification unit and an analog switch unit;
the audio processor is suitable for providing an audio control signal, a first audio signal and a second audio signal;
the audio channel selection unit is suitable for outputting a first control signal to the audio power amplification unit and outputting a second control signal to the analog switch unit according to the audio control signal, sending the first audio signal to the audio power amplification unit when the first control signal is an on signal, and sending the first audio signal and the second audio signal to the analog switch unit when the second control signal is an on signal;
the audio power amplifying unit is suitable for amplifying the first audio signal and outputting the amplified first audio signal to the output end of the audio power amplifying unit when the received first control signal is a starting signal;
the analog switch unit is suitable for outputting the first audio signal and the second audio signal to an output end of the analog switch unit when the received second control signal is a starting signal;
the audio power amplifier is realized by a chip, and the audio channel selection unit, the audio power amplification unit and the analog switch unit are integrated on the chip;
the audio path selecting unit includes: the device comprises a pulse control unit, a first path selector and a second path selector;
the pulse control unit is suitable for outputting the first control signal and the second control signal according to the pulse number of the audio control signal, starting the first channel selector when the first control signal is a starting signal, and starting the first channel selector and the second channel selector when the second control signal is a starting signal;
the first channel selector is suitable for receiving the first audio signal and sending the first audio signal to the audio power amplification unit after the first channel selector is started;
the second channel selector is suitable for receiving the second audio signal and sending the second audio signal to the analog switch unit after the second audio signal is started;
the analog switch unit comprises a first transmission gate, a second transmission gate, a first resistor, a second resistor and an inverter;
the inverter is adapted to provide an inverted signal of the second control signal;
the input end of the first transmission gate is suitable for receiving the first audio signal, the output end of the first transmission gate is connected with the first end of the first resistor, the first control end of the first transmission gate is suitable for receiving the second control signal, and the second control end of the first transmission gate is suitable for receiving the inverted signal of the second control signal; the second end of the first resistor is connected with an earphone jack;
the input end of the second transmission gate is suitable for receiving the second audio signal, the output end of the second transmission gate is connected with the first end of the second resistor, the first control end of the second transmission gate is suitable for receiving the second control signal, and the second control end of the second transmission gate is suitable for receiving the inverted signal of the second control signal; the second end of the second resistor is connected with the earphone jack;
the first transmission gate comprises a first NMOS transistor and a first PMOS transistor, and the second transmission gate comprises a second NMOS transistor and a second PMOS transistor;
the drain electrode of the first NMOS tube is connected with the source electrode of the first PMOS tube and the input end of the first transmission gate, the drain electrode source electrode of the first NMOS tube is connected with the drain electrode of the first PMOS tube and the output end of the first transmission gate, the grid electrode of the first NMOS tube is connected with the second control signal, and the grid electrode of the first PMOS tube is connected with the inverted signal of the second control signal;
the drain electrode of the second NMOS tube is connected with the source electrode of the second PMOS tube and the input end of the second transmission gate, the drain electrode source electrode of the second NMOS tube is connected with the drain electrode of the second PMOS tube and the output end of the second transmission gate, the grid electrode of the second NMOS tube is connected with the second control signal, and the grid electrode of the second PMOS tube is connected with the inverted signal of the second control signal.
2. The audio control system of claim 1, wherein one of the first audio signal and the second audio signal is a left channel audio signal and the other is a right channel audio signal.
3. The audio control system of claim 1, wherein the enable signal is high.
4. The audio control system of claim 1, wherein the first and second resistors are equal in resistance.
5. The audio control system of claim 1, wherein the first and second resistors each have a resistance of 10 Ω to 12 Ω.
6. An audio system comprising a speaker connected to an output of the audio power amplification unit, a headphone jack connected to an output of the analog switch unit, and the audio control system of any one of claims 1 to 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710011122.4A CN106792358B (en) | 2017-01-06 | 2017-01-06 | Audio control system and audio system |
| CN202010053159.5A CN111294702B (en) | 2017-01-06 | 2017-01-06 | Audio control system and audio system |
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| CN201710011122.4A CN106792358B (en) | 2017-01-06 | 2017-01-06 | Audio control system and audio system |
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| CN202010053159.5A Division CN111294702B (en) | 2017-01-06 | 2017-01-06 | Audio control system and audio system |
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| CN106792358B true CN106792358B (en) | 2020-12-11 |
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| CN201710011122.4A Active CN106792358B (en) | 2017-01-06 | 2017-01-06 | Audio control system and audio system |
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| CN107864422A (en) | 2017-09-26 | 2018-03-30 | 捷开通讯(深圳)有限公司 | Playback equipment and the player method based on playback equipment |
| CN112965684B (en) * | 2019-12-12 | 2023-08-25 | 成都鼎桥通信技术有限公司 | Audio output control method and device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN111294702A (en) | 2020-06-16 |
| CN106792358A (en) | 2017-05-31 |
| CN111294702B (en) | 2021-12-21 |
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