CN114786108A - Configuration circuit for single sound channel power amplifier and audio playing device - Google Patents
Configuration circuit for single sound channel power amplifier and audio playing device Download PDFInfo
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- CN114786108A CN114786108A CN202210223571.6A CN202210223571A CN114786108A CN 114786108 A CN114786108 A CN 114786108A CN 202210223571 A CN202210223571 A CN 202210223571A CN 114786108 A CN114786108 A CN 114786108A
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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
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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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
Abstract
A configuration circuit for a mono power amplifier and an audio playing device are provided. The detection circuit connected with the drive circuit of the loudspeaker is added, when the power amplifier is powered on, the drive circuit configures the loudspeaker wiring port in a detection state, then the detection circuit executes configuration detection, channel configuration information of the loudspeaker wiring port is detected, a detection result is recorded, the detection result is transmitted to the audio receiving and processing circuit, the audio receiving and processing circuit extracts audio signals corresponding to the channel configuration information from the digital audio input port according to the detection result, and audio processing is performed and output to the drive circuit to drive the loudspeaker to produce sound. The problem that a traditional audio power amplifier needs an independent configuration pin and the configuration mode is high in cost is solved.
Description
Technical Field
The present application relates to the field of electronic circuit technology, and more particularly, to a configuration circuit for a single channel (digital audio) power amplifier (chip).
Background
In order to adapt to some simple application scenarios of audio power amplifiers, when designing a single-channel (digital audio) power amplifier chip, the number of pins of the chip is limited, however, the single-channel digital audio power amplifier chip needs to extract an audio signal of a set channel (left channel or right channel) from a digital audio source input channel, for example, extract an audio source of the left channel for amplification and output. However, since the number of chip pins is limited, a dedicated configuration pin cannot be provided, and the configuration requirement for setting the audio channel needs to be implemented by some additional technical means, which results in a complex circuit, high cost, and low reliability.
Disclosure of Invention
The application aims to provide a configuration circuit for a single-channel power amplifier and audio playing equipment, and aims to solve the problems that a traditional audio power amplifier needs a single configuration pin and the configuration mode is high in cost.
A first aspect of the embodiments of the present application provides a configuration circuit for a mono power amplifier, including an audio receiving and processing circuit, where the audio receiving and processing circuit is configured to receive an audio signal and decode and output the audio signal, and further including:
the driving circuit is connected with the audio receiving and processing circuit and the loudspeaker wiring port of the power amplifier and is used for configuring the loudspeaker wiring port of the power amplifier to be in a detection state when the power amplifier is powered on;
the detection circuit is connected with a loudspeaker wiring port of the power amplifier and the audio receiving processing circuit, the detection circuit is used for detecting channel configuration information of the loudspeaker wiring port during power-on and outputting the channel configuration information to the audio receiving processing circuit, and the audio receiving processing circuit is used for extracting an audio signal corresponding to the channel configuration information from an audio input digital signal according to the channel configuration information, processing the audio signal and outputting the audio signal to the driving circuit.
In one embodiment, the speaker connection port is connected with a first pull-up resistor or a first pull-down resistor, and the detection circuit obtains the channel configuration information by detecting the first pull-up resistor or the first pull-down resistor.
In one embodiment, the driving circuit includes a modulation and coding circuit, a positive pull-up driving tube, a positive pull-down driving tube, a negative pull-up driving tube, and a negative pull-down driving tube, the positive pull-up driving tube and the positive pull-down driving tube are connected to a positive interface of a speaker connection port, the negative pull-up driving tube and the negative pull-down driving tube are connected to a negative interface of the speaker connection port of the speaker, and the modulation and coding circuit is configured to receive the audio signal and drive the positive pull-up driving tube, the positive pull-down driving tube, the negative pull-up driving tube, and the negative pull-down driving tube according to the audio signal, so that the speaker plays audio.
In one embodiment, the dispensing module is configured to drive the positive pull-up driving tube, the positive pull-down driving tube, the negative pull-up driving tube, and the negative pull-down driving tube to be disconnected during power-up, so that the speaker connection port is in a detection state.
In one embodiment, the detection circuit comprises:
the power-on detection circuit outputs a first signal when detecting that the modulation coding circuit is powered on;
a schmitt level comparator connected to the positive interface of the speaker connection port or the negative interface of the speaker connection port, and outputting a detection level according to a level state of the positive interface of the speaker connection port or the negative interface of the speaker connection port, wherein the detection level includes the channel configuration information;
a latch connected to the power-up detection circuit and the Schmitt level comparator, the latch latching and outputting the detection level to the audio reception processing circuit after receiving the first signal.
In one embodiment, the power-on detection circuit is connected to the modulation and coding circuit, the power-on detection circuit outputs the first signal after delaying for a first preset time when detecting power-on, and then outputs a second signal to the modulation and coding circuit after delaying for a second preset time, and the modulation and coding circuit drives the positive pull-up driving tube, the positive pull-down driving tube, the negative pull-up driving tube and the negative pull-down driving tube according to the audio signal after receiving the second signal, so that the speaker plays audio.
In one embodiment, the first pull-up resistor or the first pull-down resistor is external to the mono digital audio power amplifier.
In one embodiment, the audio amplifier further comprises a second pull-up resistor or a second pull-down resistor internally arranged in the mono digital audio power amplifier, the second pull-up resistor or the second pull-down resistor is externally connected to the loudspeaker wiring port, and the second pull-up resistor and the second pull-down resistor are respectively used for adjusting the total impedance of the loudspeaker wiring port.
In one embodiment, the configuration circuit is integrated within the mono digital audio power amplifier.
A second aspect of the embodiments of the present application provides an audio playing device, which includes left and right speakers and left and right monaural digital audio power amplifiers, and includes the configuration circuit for the monaural power amplifier.
Compared with the prior art, the embodiment of the application has the beneficial effects that:
this application has increased the detection circuitry who is connected with drive circuit, when power amplifier goes up the electricity, drive circuit configuration speaker wiring port is at the detection state, then detection circuitry carries out the configuration and detects, the passageway configuration information of detection speaker wiring port, and record the testing result, the testing result is given audio frequency receiving processing circuit for, audio frequency receiving processing circuit is according to the testing result, follow digital audio input port, extract the audio signal that passageway configuration information is corresponding, carry out audio frequency processing and export for drive circuit in order to drive the speaker sound production. The problem that a traditional audio power amplifier needs an independent configuration pin and the configuration mode is high in cost is solved.
Drawings
Fig. 1 is a schematic block diagram of a configuration circuit of a mono power amplifier according to an embodiment of the present application;
fig. 2 is a schematic block diagram of a configuration circuit of a mono power amplifier according to a second embodiment of the present application;
fig. 3 is a circuit diagram of a configuration circuit of a mono power amplifier according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, a configuration circuit for a mono (digital audio) power amplifier (chip) 100 according to an embodiment of the present disclosure includes an audio receiving and processing circuit 110, a driving circuit 120, and a detecting circuit 130. Generally, the configuration circuit of the present application is integrated within a mono digital audio power amplifier 100.
The audio receiving and processing circuit 110 is used for receiving the audio signal and decoding and outputting the audio signal. In general, the audio reception processing circuit 110 includes a decoder for decoding a received digital audio signal to obtain an analog audio signal, and an amplifier for amplifying and outputting the analog audio signal.
The speaker connection port includes a positive interface 101 and a negative interface 102, the driving circuit 120, the audio receiving and processing circuit 110, and the speaker connection port (the positive interface 101 or the negative interface 102) of the power amplifier 100, and is configured to configure the speaker connection port of the power amplifier 100 in a detection state when the power is turned on. In general, the monaural power amplifier 100 is powered on, and in order to suppress speaker noise caused by power-on, the power-on moment of the speaker connection port is not driven, and the level signal of the speaker connection port is obtained by using the short time. Therefore, the detection state means that the driving circuit 120 is in the off state to avoid the influence of the speaker noise caused by the power-on the potential of the speaker connection port.
The detection circuit 130 is connected to the speaker connection port of the power amplifier 100 and the audio receiving processing circuit 110, the detection circuit 130 is configured to detect channel configuration information of the speaker connection port when the power is turned on, and output the channel configuration information to the audio receiving processing circuit 110, and the audio receiving processing circuit 110 is configured to extract an audio signal corresponding to the channel configuration information from the audio input digital signal according to the channel configuration information, process the audio signal, and output the audio signal to the driving circuit 120. The channel configuration information refers to that the power amplifier 100 is configured in a left channel circuit or a right channel circuit, and specifically, reads a level signal of a speaker connection port to determine whether the level signal is pulled up or pulled down, so as to obtain configuration information related to the configuration information configured in the left channel circuit or the right channel circuit.
In one embodiment, the first pull-up resistor R1 or the first pull-down resistor R2 is connected to the speaker connection port, and the detection circuit 130 obtains the channel configuration information by detecting the first pull-up resistor R1 or the first pull-down resistor R2. The first pull-up resistor R1 is connected between the positive interface 101 and the positive power supply, and the first pull-down resistor R2 is connected between the negative interface 102 and the power ground. For example, if a pull-up resistor is detected between the positive interface 101 and the positive power supply, it is determined that the chip 100 is disposed in the right channel, and if a pull-down resistor is detected between the negative interface 102 and the ground power supply, it is determined that the chip 100 is disposed in the left channel.
The speaker connection port of the power amplifier 100 chip is typically double-ended differential driven. At either of the speaker connection ports, a pull-up or pull-down resistor may be connected to instruct the power amplifier 100 chip to extract either the left channel or the right channel audio signal from the digital audio input channel. During normal work, because the loudspeaker wiring port has a played audio signal, the pull-up or pull-down level signal cannot be obtained, so that the loudspeaker wiring port is floated (namely, the loudspeaker drive is disconnected), the level signal of the loudspeaker wiring port is read to judge whether the audio signal is the pull-up or pull-down signal, and further the configuration information is obtained. Usually, the first pull-up resistor R1 or the first pull-down resistor R2 is externally disposed on the monaural digital audio power amplifier 100, and the impedance of the first pull-up resistor R1 or the first pull-down resistor R2 should be much larger than the impedance of the speaker, and the impedance is usually over 100K ohms.
Referring to fig. 2, optionally, the audio amplifier further includes a second pull-up resistor R3 or a second pull-down resistor R4 which is internally disposed in the monaural digital audio power amplifier 100, the second pull-up resistor R3 or the second pull-down resistor R4 is externally connected to the speaker connection port, and the external first pull-up resistor R1 or the external first pull-down resistor R2 is respectively used for adjusting the total impedance of the speaker connection port. Usually, the resistance of the pull-up or pull-down resistor external to the chip is much smaller than that of the pull-up or pull-down resistor in the chip.
Referring to fig. 3, in one embodiment, the driving circuit 120 includes a modulation and coding circuit 122, a positive pull-up driving tube M1, a positive pull-down driving tube M2, a negative pull-up driving tube M3, and a negative pull-down driving tube M4, the positive pull-up driving tube M1 and the positive pull-down driving tube M2 are connected to the positive interface 101 of the speaker connection port, the negative pull-up driving tube M3 and the negative pull-down driving tube M4 are connected to the negative interface 102 of the speaker connection port of the speaker 200, and the modulation and coding circuit 122 is configured to receive an audio signal and drive the positive pull-up driving tube M1, the positive pull-down driving tube M2, the negative pull-up driving tube M3, and the negative pull-down driving tube M4 according to the audio signal, so that the speaker 200 plays audio.
The positive pull-up driving transistor M1, the positive pull-down driving transistor M2, the negative pull-up driving transistor M3, and the negative pull-down driving transistor M4 may employ switching devices such as MOS transistors, triodes, and the like. The modulation and coding circuit 122 may employ a driving chip such as a MOS transistor or a triode, the audio receiving and processing circuit 110 decodes the analog audio signal to obtain an analog audio signal, and the modulation and coding circuit 122 makes the speaker 200 play audio according to the analog audio signal through the positive pull-up driving transistor M1, the positive pull-down driving transistor M2, the negative pull-up driving transistor M3, and the negative pull-down driving transistor M4.
Specifically, the modulation and coding circuit 122 drives the positive pull-up driving tube M1, the positive pull-down driving tube M2, the negative pull-up driving tube M3, and the negative pull-down driving tube M4 to be turned off when the power is turned on, so that the connection port of the speaker 200 is in a detection state. The loudspeaker wiring port is floated (namely, the loudspeaker 200 is disconnected for driving), and the level signal of the loudspeaker wiring port is read to judge whether the loudspeaker wiring port is pulled up or pulled down, so that the configuration information is obtained.
In one embodiment, the power-on detection circuit 132 is connected to the modulation and coding circuit 122, the power-on detection circuit 132 outputs a first signal after detecting a power-on delay time for a first preset time, and then outputs a second signal to the modulation and coding circuit 122 after delaying for a second preset time, and the modulation and coding circuit 122 drives the positive pull-up driving tube M1, the positive pull-down driving tube M2, the negative pull-up driving tube M3, and the negative pull-down driving tube M4 according to the audio signal after receiving the second signal, so that the speaker 200 plays audio.
For example, at time T1 after the chip is powered on (e.g., 10 ms after power on), a power on completion flag a is output to latch 136, and after a delay of T2 (e.g., 10 ms), a power on completion flag B is output. The power-up completion flag a causes latch 136 to latch the output of schmitt level comparator 134. The power-on completion flag a is set until the power-on completion flag B is set, and the output of the modulation and coding circuit 122 is controlled, so that the 4 driving tubes are all in a closed state, and after the power-on completion flag B is set, the modulation and coding circuit 122 performs modulation processing according to the input audio signal, and outputs a modulation signal to drive the 4 driving tubes to control the loudspeaker 200 to sound.
The audio reception processing circuit 110 extracts an audio signal of a specified channel from the input audio digital signal according to the output of the latch 136 for processing, and then outputs the processed analog audio signal to the modulation coding circuit 122. The reference level of the schmitt level comparator 134 is not a critical element and is not specifically illustrated here. The input of the schmitt level comparator 134 may be connected to either the positive or negative pole of the speaker 200, since the speaker 200 has a small internal resistance, which may be considered a short circuit relative to the external pull-up or pull-down resistance.
In the example of fig. 3, the detection circuit 130 is connected to and detects the negative interface 102 of the speaker connection port, and in operation, if the negative interface 102 is detected to have a pull-down resistor, it indicates that the positive interface 101 is not provided with a pull-up resistor, and vice versa; in other embodiments, the detection circuit 130 may be connected to and detect the positive interface 101 of the speaker connection port, and if it can detect that the positive interface 101 has a pull-up resistor, it indicates that the negative interface 102 has no pull-down resistor, and vice versa.
A second aspect of the embodiments of the present application provides an audio playing device, which includes left and right speakers 200 and left and right monaural digital audio power amplifiers 100, and includes the configuration circuit for the monaural power amplifier 100 described above.
The driving connection control module and the detection circuit 130 are added, when the power amplifier 100 is powered on, the driving circuit 120 configures the loudspeaker wiring port in a detection state, then the detection circuit 130 executes configuration detection, detects channel configuration information of the loudspeaker wiring port, records a detection result, transmits the detection result to the audio receiving and processing circuit 110, and the audio receiving and processing circuit 110 extracts an audio signal corresponding to the channel configuration information from the digital audio input port according to the detection result, performs audio processing and outputs the audio signal to the driving circuit 120 so as to drive the loudspeaker 200 to sound. After the configuration detection circuit 130 completes the configuration detection, the detection result is locked, and then the driver connection module is notified to enter the normal operation mode. The driving connection module receives an input audio signal and converts the audio signal into a driving signal for the speaker 200 in a normal operation mode.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A configuration circuit for a mono power amplifier, comprising an audio receive processing circuit for receiving an audio signal and decoding an output, further comprising:
the driving circuit is connected with the audio receiving and processing circuit and the loudspeaker wiring port of the power amplifier and is used for configuring the loudspeaker wiring port of the power amplifier to be in a detection state when the power amplifier is powered on;
the detection circuit is connected with a loudspeaker wiring port of the power amplifier and the audio receiving processing circuit, the detection circuit is used for detecting channel configuration information of the loudspeaker wiring port during power-on and outputting the channel configuration information to the audio receiving processing circuit, and the audio receiving processing circuit is used for extracting an audio signal corresponding to the channel configuration information from an audio input digital signal according to the channel configuration information, processing the audio signal and outputting the audio signal to the driving circuit.
2. The configuration circuit according to claim 1, wherein a first pull-up resistor or a first pull-down resistor is connected to the speaker connection port, and the detection circuit obtains the channel configuration information by detecting the first pull-up resistor or the first pull-down resistor.
3. The configuration circuit according to claim 1 or 2, wherein the driving circuit comprises a modulation coding circuit, a positive pull-up driving tube, a positive pull-down driving tube, a negative pull-up driving tube and a negative pull-down driving tube, the positive pull-up driving tube and the positive pull-down driving tube are connected to a positive interface of a speaker connection port, the negative pull-up driving tube and the negative pull-down driving tube are connected to a negative interface of a speaker connection port of a speaker, and the modulation coding circuit is configured to receive the audio signal and drive the positive pull-up driving tube, the positive pull-down driving tube, the negative pull-up driving tube and the negative pull-down driving tube according to the audio signal so as to enable the speaker to play audio.
4. The configuration circuit of claim 3 wherein said modulation coding circuit is configured to drive said positive pull-up driver tube, said positive pull-down driver tube, said negative pull-up driver tube, and said negative pull-down driver tube to open upon power-up to place said speaker connection port in a test state.
5. The configuration circuit of claim 3, wherein the detection circuit comprises:
the power-on detection circuit outputs a first signal when detecting that the modulation coding circuit is powered on;
a Schmidt level comparator connected to the positive interface of the speaker wiring port or the negative interface of the speaker wiring port, and outputting a detection level according to the level state of the positive interface of the speaker wiring port or the negative interface of the speaker wiring port, wherein the detection level comprises the channel configuration information;
a latch connected to the power-up detection circuit and the Schmitt level comparator, the latch latching and outputting the detection level to the audio reception processing circuit after receiving the first signal.
6. The configuration circuit according to claim 5, wherein the power-on detection circuit is connected to the modulation and coding circuit, the power-on detection circuit outputs the first signal after delaying for a first preset time when detecting power-on, and then outputs a second signal to the modulation and coding circuit after delaying for a second preset time, and the modulation and coding circuit drives the positive pull-up driving tube, the positive pull-down driving tube, the negative pull-up driving tube, and the negative pull-down driving tube according to the audio signal after receiving the second signal, so as to enable a speaker to play audio.
7. The configuration circuit of claim 2, wherein the first pull-up resistor or the first pull-down resistor is external to the mono digital audio power amplifier.
8. The configuration circuit of claim 7, further comprising a second pull-up resistor or a second pull-down resistor built into the mono digital audio power amplifier, the second pull-up resistor or the second pull-down resistor externally connected to the speaker wiring port, the second pull-up resistor and the second pull-down resistor respectively for adjusting a total impedance of the speaker wiring port.
9. The configuration circuit of claim 1 or 2, wherein the configuration circuit is integrated within the mono digital audio power amplifier.
10. An audio playback device comprising left and right loudspeakers and left and right mono digital audio power amplifiers, comprising a configuration circuit for a mono power amplifier as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210223571.6A CN114786108B (en) | 2022-03-07 | 2022-03-07 | Configuration circuit for single sound channel power amplifier and audio playing equipment |
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| CN202210223571.6A CN114786108B (en) | 2022-03-07 | 2022-03-07 | Configuration circuit for single sound channel power amplifier and audio playing equipment |
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| CN114786108B (en) | 2022-12-09 |
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