CN114501237B - Audio signal output circuit and electronic equipment - Google Patents
Audio signal output circuit and electronic equipment Download PDFInfo
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- CN114501237B CN114501237B CN202210106972.3A CN202210106972A CN114501237B CN 114501237 B CN114501237 B CN 114501237B CN 202210106972 A CN202210106972 A CN 202210106972A CN 114501237 B CN114501237 B CN 114501237B
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- 230000005236 sound signal Effects 0.000 title claims abstract description 169
- 238000005070 sampling Methods 0.000 claims abstract description 89
- 230000003321 amplification Effects 0.000 claims abstract description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 24
- 239000003990 capacitor Substances 0.000 claims description 31
- 238000001914 filtration Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 8
- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 description 4
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- 239000010752 BS 2869 Class D Substances 0.000 description 3
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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
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
Abstract
The application provides an audio signal output circuit and electronic equipment. The audio signal output circuit comprises a control chip and a control circuit, wherein the control chip is used for outputting an initial audio signal; the first-stage power amplifier circuit is electrically connected between the control chip and the corresponding loudspeaker and is used for receiving the initial audio signal and performing power amplification treatment on the initial audio signal so as to output a target audio signal to the corresponding loudspeaker; one end of the N-stage power amplifier circuit is electrically connected between any N-1-stage power amplifier circuit and a loudspeaker electrically connected with the N-1-stage power amplifier circuit through the sampling filter circuit, and the other end of the N-stage power amplifier circuit is electrically connected with the other loudspeaker. Wherein N is greater than or equal to 2, and the sampling filter circuit comprises a sampling circuit and a filter circuit. The audio signal output circuit can drive a plurality of loudspeakers through the audio output port, and can use the digital power amplifier and the analog power amplifier in a mixing mode, so that the problem that the sound quality of electronic equipment is poor due to time delay asynchronism is solved.
Description
Technical Field
The present disclosure relates to the field of audio circuits, and more particularly, to an audio signal output circuit and an electronic device.
Background
More and more electronic devices such as tablet computers, displays, etc. are provided with a plurality of speakers. However, the existing audio signal output circuit does not drive a plurality of speakers to output sound signals well at the same time.
Disclosure of Invention
The embodiment of the application provides an audio signal output circuit and electronic equipment, so as to realize synchronous driving of a plurality of speakers to output sound signals.
A first aspect of embodiments of the present application provides an audio signal output circuit for driving a plurality of speakers. The audio signal output circuit comprises a control chip, a first-stage power amplifier circuit and an Nth-stage power amplifier circuit. The control chip is used for outputting an initial audio signal. The first stage power amplifier circuit is electrically connected between the control chip and the corresponding loudspeaker and is used for receiving the initial audio signal and performing power amplification processing on the initial audio signal so as to output a target audio signal to the corresponding loudspeaker. One end of the N-stage power amplifier circuit is electrically connected to the output end of any N-1-stage power amplifier circuit through the sampling filter circuit, and the other end of the N-stage power amplifier circuit is electrically connected to another loudspeaker. The sampling filter circuit is used for carrying out sampling processing and filtering processing on a target audio signal output by the N-1 stage power amplifier circuit so as to obtain a sampled analog audio signal, and outputting the sampled analog audio signal to the N stage power amplifier circuit.
In the scheme provided by the embodiment of the application, the control chip outputs an initial audio signal to the first-stage power amplifier circuit so that the first-stage power amplifier circuit drives the loudspeaker; meanwhile, a sampling filter circuit is arranged behind the first-stage power amplifier circuit so as to sample and filter a first target audio signal output by the first-stage power amplifier circuit, and thus the obtained sampled analog audio signal is output to the Nth-stage power amplifier circuit so as to drive a plurality of loudspeakers in parallel through a plurality of power amplifier circuits.
In one possible implementation, the sampling circuit is electrically connected between any of the N-1 stage power amplifier circuits and a speaker electrically connected to the N-1 stage power amplifier circuit, and is configured to sample a target audio signal output by the N-1 stage power amplifier circuit. The filter circuit is electrically connected to the sampling circuit and is used for acquiring a sampling signal and filtering the sampling signal to output a sampling analog audio signal. The N-stage power amplifier circuit is electrically connected to the output end of the filter circuit and is used for receiving the sampled analog audio signal and performing power amplification processing on the sampled analog audio signal so as to output a target audio signal to a correspondingly connected loudspeaker.
In the scheme provided by the embodiment of the application, the sampling circuit and the filter circuit are arranged in the sampling circuit so as to sample and filter the target audio signal output by the N-1 stage power amplifier circuit, thereby outputting a sampled analog audio signal.
In one possible implementation, the first stage power amplifier circuit includes a first power amplifier, the first power amplifier is configured to perform power amplification processing on the received initial audio signal, and the first power amplifier is a digital power amplifier or an analog power amplifier.
In one possible implementation manner, the nth stage power amplifier circuit includes a second power amplifier, the second power amplifier is used for performing power amplification processing on the received sampled analog audio signal, and the second power amplifier is an analog power amplifier.
In one possible implementation, each sampling circuit includes at least one voltage dividing element electrically connected between any of the N-1 stage power amplifier circuits and a speaker electrically connected to the N-1 stage power amplifier circuits.
In the scheme provided by the embodiment of the application, the voltage division element is arranged to divide and sample the signal output by any N-1 stage power amplifier circuit.
In one possible implementation manner, the at least one voltage dividing element comprises a voltage dividing resistor, the voltage dividing resistor is electrically connected between any of the N-1 stage power amplifier circuits and a loudspeaker electrically connected with the N-1 stage power amplifier circuit, and the filter circuit is electrically connected to two ends of the voltage dividing resistor for obtaining the sampling signal.
In the scheme provided by the embodiment of the application, the voltage dividing resistor is electrically connected between the N-1 stage power amplification circuit and the loudspeaker, and the filter circuit is electrically connected to two ends of the voltage dividing resistor so as to acquire the sampling signal.
In one possible implementation, the at least one voltage dividing element includes a first resistor, a second resistor, and a third resistor, and the N-1 stage power amplifier circuit includes a first output terminal and a second output terminal. One end of the first resistor is electrically connected between the first output end and the loudspeaker electrically connected with the first output end, the other end of the first resistor is electrically connected to the second resistor, the other end of the second resistor is electrically connected to the third resistor, and the other end of the third resistor is electrically connected between the second output end and the loudspeaker electrically connected with the second output end. The filter circuit is electrically connected to two ends of any combination of the first resistor, the second resistor and the third resistor and is used for obtaining sampling signals.
In the scheme provided by the embodiment of the application, the plurality of voltage dividing resistors are connected in series between two output ends of the N-1 stage power amplification circuit, and the filter circuit is electrically connected to two ends of any one combination of the first resistor, the second resistor and the third resistor, so that sampling signals are obtained.
In one possible implementation, the filter circuit includes a first filter resistor, a second filter resistor, a first filter capacitor, and a second filter capacitor. One end of the first filter resistor is electrically connected to the sampling circuit, the other end of the first filter resistor is electrically connected to the first filter capacitor, and the other end of the first filter capacitor is grounded. One end of the second filter resistor is electrically connected to the sampling circuit, the other end of the second filter resistor is electrically connected to the second filter capacitor, and the other end of the second filter capacitor is grounded.
In the scheme provided by the embodiment of the application, the RC filter circuit is formed by setting the corresponding filter resistor and the filter capacitor in the filter circuit, so that the acquired sampling signal is filtered to output the sampling analog audio signal.
In one possible implementation, the nth stage power amplifier circuit includes a first input terminal and a second input terminal. The N-th stage power amplifier circuit is electrically connected between a first filter resistor and a first filter capacitor in the corresponding connected filter circuit through a first input end, and is electrically connected between a second filter resistor and a second filter capacitor in the corresponding connected filter circuit through a second input end, so that a sampling analog audio signal output by the filter circuit is obtained.
In the scheme provided by the embodiment of the application, the N-th stage power amplifier circuit is electrically connected to the filter circuit to acquire the sampled analog audio signal, so that the sampled analog audio signal is subjected to power amplification processing to output a corresponding target audio signal, and then a corresponding loudspeaker is driven to output a sound signal.
The second aspect of the present application also provides an electronic device, including at least two speakers and the audio signal output circuit according to any one of the above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly describe the drawings in the embodiments, it being understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a portion of an interface of a control chip according to the prior art;
FIG. 2 is a circuit diagram of an audio signal output circuit of the prior art;
fig. 3 is a schematic diagram of an electronic device according to an embodiment of the present application;
fig. 4 is a circuit block diagram of an audio signal output circuit according to an embodiment of the present application;
FIG. 5 is a block diagram of an audio signal output circuit according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a portion of an audio signal output circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic circuit diagram of a portion of an audio signal output circuit according to another embodiment of the present application.
Description of main reference numerals:
electronic device 200
Audio signal output circuits 100, 1a, 1b
Control chip 10a, 10
First stage power amplifier circuit 20
Sampling filter circuit 30
Sampling circuits 31, 31a, 31b
Divider resistor R0
First resistor R1
Second resistor R2
Third resistor R3
Filter circuits 32, 32a
First filter resistor Ra
Second filter resistor Rb
First filter capacitor C1
Second filter capacitor C2
N-th stage power amplifier circuit 40
Second stage power amplifier circuit 50
Speakers 60, 70
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
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 herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.
Some embodiments of the present application are described in detail. The following embodiments and features of the embodiments may be combined with each other without collision.
More and more electronic devices such as tablet computers, displays, etc. are provided with a plurality of speakers. Thus, the control chip 10a in the electronic device is also correspondingly provided with a plurality of audio signal output ports (refer to fig. 1). However, due to the asynchronous time delay between the different audio signal output ports, the tone quality of the electronic equipment is poor. For example, the audio output port of the control chip 10a of the existing electronic device includes a digital interface (e.g., an I2S interface or a TDM interface) and an analog interface (e.g., an HS interface, an EAR interface, an AU interface, a Class-D interface, or the like). And the digital interface is electrically connected to the digital power amplifier, and the analog interface is electrically connected to the analog power amplifier. However, the existing control chip 10a does not set the synchronous output management program between the interfaces, so that the time delays between the different audio signal output ports are not synchronous, and the sound quality of the electronic device is poor.
With continued reference to fig. 2, in order to achieve simultaneous output of audio signals by a plurality of speakers, in the prior art, a plurality of power amplifiers are connected in parallel to an audio output port of the control chip 10a, and the other ends of the power amplifiers are electrically connected to corresponding speakers, respectively, so as to achieve synchronous output of the plurality of audio signals. However, in this way, the types of the power amplifiers are required to be consistent, and the digital power amplifier and the analog power amplifier cannot be mixed.
Referring to fig. 3 and fig. 4 together, for this reason, the embodiment of the present application provides an audio signal output circuit 100, which is applied to an electronic device 200. The electronic device 200 includes at least two speakers (refer to fig. 4), and the audio signal output circuit 100 is configured to drive the at least two speakers on the electronic device 200 in parallel, so as to realize that a plurality of speakers of the electronic device 200 synchronously play out sound signals.
It is appreciated that the electronic device 200 according to the embodiments of the present application may include, but is not limited to, a mobile terminal or a fixed terminal such as a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a handheld computer, an intercom, a netbook, a Point of sale (POS) device, a personal digital assistant (personal digital assistant, PDA), a wearable device, a virtual reality device, a wireless U-disc, a bluetooth sound/earphone, a vehicle-mounted device, a car-recorder, a security device, or a medical device. The present application uses the electronic device 200 as a mobile phone to illustrate the working principle of the audio signal output circuit 100.
In some embodiments, the audio signal output circuit 100 includes a control chip 10, a first stage power amplifier circuit 20, an nth stage power amplifier circuit 40, and a sampling filter circuit 30 electrically connected between any of the nth-1 stage power amplifier circuits and the nth stage power amplifier circuit.
The control chip 10 is electrically connected to the first stage power amplifier circuit 20, and is configured to output an initial audio signal to the first stage power amplifier circuit 20. It will be appreciated that the control chip 10 is electrically connected to the first stage power amplifier circuit 20 through an audio signal output port. The embodiment of the present application does not limit the type of the audio signal output port on the control chip 10. For example, in some embodiments, the audio output port on the control chip 10 may be a digital signal interface, such as an I2S interface, so that the initial audio signal output by the control chip 10 is a digital audio signal; in other embodiments, the audio output port on the control chip 10 may be an analog signal interface, such as an HS interface, EAR interface, AU interface, or Class-D interface, so that the initial audio signal output by the control chip 10 is an analog audio signal.
It will be appreciated that the control chip 10 may be an analog baseband chip, a central processing unit (Central Processing Unit, CPU), or other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or microprocessor, etc. having an audio signal output port, and outputs an initial audio signal through the audio signal output port.
The first stage power amplifier circuit 20 includes at least a first power amplifier (not shown). The first power amplifier is used for performing power amplification processing on the received initial audio signal. It will be appreciated that the type of first power amplifier corresponds to the type of initial audio signal output by the control chip 10. For example, when the initial audio signal output by the control chip 10 is a digital audio signal, the first power amplifier is also a digital power amplifier, and the interface of the first stage power amplifier circuit 20 electrically connected to the control chip 10 is also a digital signal interface; when the initial audio signal output by the control chip 10 is an analog signal, the first power amplifier is also an analog power amplifier, and the interface of the first stage power amplifier circuit 20 electrically connected to the control chip 10 is an analog signal interface.
In this embodiment, the first target audio signal output by the first stage power amplifier circuit 20 is a Class-D signal.
It will be appreciated that the specific circuit configuration of the first stage power amplifier circuit 20 is not limited in this application, and the first stage power amplifier circuit 20 may be an electronic device (e.g., an amplifier) or a circuit that implements a power amplifying function.
The first stage power amplifier circuit 20 is configured to perform power amplification processing on the received initial audio signal, so as to output a first target audio signal. It will be appreciated that the output of the first stage power amplifier circuit 20 is also electrically connected to the speaker (1, 1) to output a first target audio signal to the speaker (1, 1) to drive the speaker (1, 1) to output a sound signal.
One end of the nth stage power amplifying circuit 40 is electrically connected to the output end of any of the nth-1 stage power amplifying circuits through the sampling filter circuit 30, and the other end is electrically connected to the speaker. That is, one end of the nth stage power amplifying circuit 40 is electrically connected to any of the nth-1 stage power amplifying circuits and the speaker electrically connected to the nth-1 stage power amplifying circuit through the sampling filter circuit 30, and the other end is electrically connected to the other speaker. Wherein N is greater than or equal to 2.
It is understood that the number of the nth stage power amplifying circuits 40 is not limited, and each nth stage power amplifying circuit 40 may be electrically connected to a corresponding speaker to drive the speaker to output a sound signal. Thus, when there are N nth stage power amplifying circuits 40, there are corresponding N speakers, for example, speakers (N, 1) to (N, N), to be electrically connected to the corresponding nth stage power amplifying circuits 40, respectively.
It will be appreciated that the sampling filter circuit 30 is electrically connected to the output end of any N-1 stage power amplifier circuit, and is configured to sample and filter the target audio signal output by the N-1 stage power amplifier circuit to obtain a sampled analog audio signal. It will be appreciated that each sampling filter circuit 30 is further electrically connected to a plurality of nth stage power amplifier circuits 40 to output sampled analog audio signals to the nth stage power amplifier circuits 40. Thus, the N-th power amplifier circuits 40 perform power amplification processing on the obtained sampled analog audio signals, so as to drive the corresponding speakers to output sound signals.
In some embodiments, sampling filter circuit 30 includes a sampling circuit 31 and a filter circuit 32 electrically connected to each other. It will be appreciated that the sampling circuit 31 is electrically connected to the output of the N-1 stage power amplifier circuit, i.e. the sampling circuit 31 is electrically connected between the N-1 stage power amplifier circuit and the speaker electrically connected to the N-1 stage power amplifier circuit. The sampling circuit 31 is configured to sample the first target audio signal output by the first stage power amplifier circuit 20.
The filter circuit 32 is electrically connected to the sampling circuit 31 for acquiring a sampling signal and performing a filter process on the acquired sampling signal to output a sampled analog audio signal.
The N-th power amplifier circuits 40 are electrically connected to the output ends of the filter circuits 32, and are configured to receive the sampled analog audio signals output by the filter circuits 32, and perform power amplification processing on the received sampled analog audio signals to output N-th target audio signals to corresponding speakers, so as to drive the speakers to output sound signals. It will be appreciated that in the audio signal output circuit 100, the phases of the target audio signals output by each stage of power amplifier circuits (e.g., the first stage power amplifier circuit 20, … …, the N-1 stage power amplifier circuit, and the N-th stage power amplifier circuit) are substantially the same, so that the speakers in the audio signal output circuit 100 can synchronously output sound signals.
In some embodiments, the nth stage power amplifier circuit 40 includes at least one second power amplifier (not shown). The second power amplifier is used for performing power amplification processing on the received sampled analog audio signal. It will be appreciated that since the sampled analog audio signal output by the filter circuit 32 is an analog audio signal, the second power amplifier is an analog power amplifier. And the interface of the nth stage power amplifier circuit 40 electrically connected to the filter circuit 32 is also an analog signal interface.
With continued reference to fig. 5, the embodiment of the present application further provides an audio signal output circuit 1. It is understood that the audio signal output circuit 1 is a circuit block diagram that is available when N in the audio signal output circuit 100 is 2. That is, the circuit structure and the operation principle of the audio signal output circuit 1 are substantially the same as those of the audio signal output circuit 100, and the audio signal output circuit 1 includes a control chip 10, a first stage power amplifier circuit 20, a sampling filter circuit 30, and a second stage power amplifier circuit 50.
It will be appreciated that in the audio signal output circuit 1, the first stage power amplifier circuit 20 is also electrically connected to the speaker 60 for driving the speaker 60 to output a sound signal. The second stage power amplification circuits 50 are also electrically connected to corresponding speakers 70, respectively, for driving the speakers 70 to output sound signals.
It will be appreciated that in some embodiments, the output signals of the first stage power amplifier circuit 20 and the second stage power amplifier circuit 50 are both differential signals. That is, the first stage power amplifier circuit 20 outputs two first target audio signals, which are differential signals. The second stage power amplifier circuit 50 outputs two second target audio signals, which are differential signals. It will be appreciated that when the first stage power amplifier circuit 20 and the second stage power amplifier circuit 50 both output differential signals, the first stage power amplifier circuit 20 and the second stage power amplifier circuit 50 are typically used to drive corresponding speakers (e.g., speaker 60 and speaker 70) to generate sound signals of a bass segment. In some embodiments, the output signals of the first stage power amplifier circuit 20 and the second stage power amplifier circuit 50 may be single-ended signals. That is, the output end of the first stage power amplifier circuit 20 only outputs a first target audio signal; the output terminal of the second stage power amplifier circuit 50 outputs a second target audio signal. It will be appreciated that when the first stage power amplifier circuit 20 and the second stage power amplifier circuit 50 output single-ended signals, the first stage power amplifier circuit 20 and the second stage power amplifier circuit 50 are typically used to drive corresponding speakers (e.g., the speaker 60 and the speaker 70) to generate high audio band sound signals.
With continued reference to fig. 6 and fig. 7, the embodiment of the present application further describes specific circuit structures of the sampling circuit 31 and the filtering circuit 32 by using the output signals of the first stage power amplifier circuit 20 and the second stage power amplifier circuit 50 as differential signals.
Referring to fig. 6, an embodiment of the present application provides an audio signal output circuit 1a. The circuit configuration of the audio signal output circuit 1a is substantially the same as that of the audio signal output circuit 1, except that the audio signal output circuit 1a replaces the sampling circuit 31 in the audio signal output circuit 1 with the sampling circuit 31a and the filter circuit 32 with the filter circuit 32a.
The sampling circuit 31a includes at least one voltage dividing element. The at least one voltage dividing element is electrically connected to the output end of the first stage power amplifier circuit 20, that is, the at least one voltage dividing element is electrically connected between the first stage power amplifier circuit 20 and the speaker 60, and is used for dividing and sampling the voltage output by the first stage power amplifier circuit 20. For example, in the embodiment of the present application, the at least one voltage dividing element includes a voltage dividing resistor R0.
In the present embodiment, the first stage power amplifier circuit 20 includes a first output terminal Out1 and a second output terminal Out2. And the voltage dividing resistor R0 is electrically connected between the second output terminal Out2 and the speaker 60. It is understood that, since the signals output by the first output terminal Out1 and the second output terminal Out2 are differential signals, in other embodiments, the voltage dividing resistor R0 may be electrically connected between the first output terminal Out1 and the speaker 60.
It is understood that, since the voltage dividing resistor R0 is electrically connected between the first output terminal Out1 and the speaker 60, and the current of the signal output from the first output terminal Out1 flows through the voltage dividing resistor R0, the voltage can be generated across the voltage dividing resistor R0. Thus, the filter circuit 32a is electrically connected to both ends of the voltage dividing resistor R0, and can obtain the sampling signal.
It will be appreciated that the filter circuit 32a is operative to filter the acquired sampled signals to output sampled analog audio signals.
In the present embodiment, the filter circuit 32a includes a first filter resistor Ra, a second filter resistor Rb, a first filter capacitor C1, and a second filter capacitor C2. One end of the first filter resistor Ra is electrically connected to the sampling circuit 31a, and the other end is electrically connected to the first filter capacitor C1. The other end of the first filter capacitor C1 is grounded. The second filter resistor Rb has one end electrically connected to the sampling circuit 31a and the other end electrically connected to the second filter capacitor C2. The other end of the second filter capacitor C2 is grounded.
In the embodiment of the present application, the first filter resistor Ra is electrically connected between the first stage power amplifier circuit 20 and the voltage dividing resistor R0 of the sampling circuit 31a, and the second filter resistor Rb is electrically connected between the voltage dividing resistor R0 of the sampling circuit 31a and the speaker 60 to obtain the sampling signal.
It can be appreciated that the first filter resistor Ra, the second filter resistor Rb, the first filter capacitor C1 and the second filter capacitor C2 together form an RC filter circuit for filtering the obtained sampled signal to output the sampled analog audio signal to the second stage power amplifier circuit 50.
The second stage power amplifier circuit 50 includes a first input terminal In1 and a second input terminal In2. The second stage power amplifier circuit 50 is electrically connected between the first filter resistor Ra and the first filter capacitor C1 through the first input end In1, and is electrically connected between the second filter resistor Rb and the second filter capacitor C2 through the second input end In2, so as to obtain the sampled analog audio signal output by the filter circuit 32a. The second stage power amplifier circuit 50 performs power amplification processing on the obtained sampled analog audio signal, and outputs a second target audio signal to the corresponding speaker 70, so as to drive the speaker 70 to output a sound signal.
It can be appreciated that in the present embodiment, the first target audio signal and the second target audio signal are both differential signals.
It will be appreciated that the present application does not limit the number of resistors in the sampling circuit 31 a. For example, referring to fig. 6, in other embodiments, at least one voltage dividing element may also include 3 resistors.
With continued reference to fig. 7, another embodiment of the present application further provides an audio signal output circuit 1b. The audio signal output circuit 1b is substantially identical to the audio signal output circuit 1a in circuit configuration, except that the audio signal output circuit 1b replaces the sampling circuit 31a in the audio signal output circuit 1a with the sampling circuit 31b.
In some embodiments, the at least one voltage dividing element in the sampling circuit 31b includes a first resistor R1, a second resistor R2, and a third resistor R3. The first resistor R1, the second resistor R2 and the third resistor R3 are connected in series between the first output terminal Out1 and the second output terminal Out2 of the first stage power amplifier circuit 20. That is, in the present embodiment, one end of the first resistor R1 is electrically connected between the first output terminal Out1 and the speaker 60, and the other end of the first resistor R1 is electrically connected to the second resistor R2. The other end of the second resistor R2 is electrically connected to the third resistor R3. The other end of the third resistor R3 is electrically connected between the second output terminal Out2 and the speaker 60. Thus, the total voltage of the first resistor R1, the second resistor R2 and the third resistor R3 after being connected in series is the voltage between the first output terminal out1 and the second output terminal out2 of the first stage power amplifier circuit 20.
It is understood that the filter circuit 32a may be electrically connected to two ends of any combination of the first resistor R1, the second resistor R2 and the third resistor R3 for obtaining the sampling signal. That is, the filter circuit 32a may be electrically connected to both ends of any one of the first resistor R1, the second resistor R2, or the third resistor R3. The filter circuit 32a may also be electrically connected to two ends of the first resistor R1 and the second resistor R2 connected in series, that is, the filter circuit 32a may be electrically connected between the first stage power amplifier circuit 20 and the first resistor R1, and between the second resistor R2 and the third resistor R3, so as to obtain the sampling signal. The filter circuit 32a may be further electrically connected to two ends of the first resistor R1, the second resistor R2, and the third resistor R3 after being connected in series, so as to obtain the sampling signal. That is, when one end of the filter circuit 32a is electrically connected between the first resistor R1 and the first stage power amplifier circuit 20 and the other end of the filter circuit 32a is electrically connected between the third resistor R3 and the speaker 60, the voltage of the sampling signal obtained by the filter circuit 32a is the same as the voltage of the first target audio signal output by the first stage power amplifier circuit 20.
In the present embodiment, the filter circuit 32a samples the first target audio signal output from the first stage power amplifier circuit 20 by acquiring the voltage across the second resistor R2. That is, the filter circuit 32a is electrically connected between the first resistor R1 and the second resistor R2 through the first filter resistor Ra, and electrically connected between the second resistor R2 and the third resistor R3 through the second filter resistor Rb to obtain the voltage across the second resistor R2. In this way, the filter circuit 32a further performs a filter process on the acquired sampling signal to output a sampled analog audio signal.
It is understood that the resistance values of the first resistor R1, the second resistor R2, the third resistor R3, the first filter resistor Ra and the second filter resistor Rb are not limited, and the capacitances of the first filter capacitor C1 and the second filter capacitor C2 are not specifically limited. The resistance value and the capacitance value can be adjusted according to actual needs by a person skilled in the art.
It is understood that the sampling circuits 31a/31b and the filtering circuit 32a mentioned in the above embodiments can be applied to any sampling filtering circuit 30 in the audio signal output circuit 100. That is, the above-mentioned first stage power amplifier circuit 20 may be replaced by an N-1 stage power amplifier circuit, and the above-mentioned second stage power amplifier circuit 50 may be replaced by an N-th stage power amplifier circuit 40, so as to apply the above-mentioned sampling circuits 31a/31b and filter circuit 32a to the audio signal output circuit 100.
It is understood that the circuit structure of each sampling filter circuit 30 in the audio signal output circuit 100 may be the same or different, and those skilled in the art can adjust the circuit structure of the sampling filter circuit 30 according to actual needs.
It is to be understood that the specific circuit structures of the sampling circuit 31 (31 a/31 b) and the filter circuit 32 (32 a) are not limited in this application, and the sampling circuit 31 (31 a/31 b) may be any circuit, electronic device, chip or the like capable of realizing the sampling function, and the filter circuit 32 (32 a) may be any circuit, electronic device, chip or the like capable of realizing the filter function.
It can be understood that the audio signal output circuit 100 (1/1 a/1 b) provided in the present application outputs an initial audio signal to the first stage power amplifier circuit 20 through one audio signal output port of the control chip 10, so that the first stage power amplifier circuit 20 drives the speaker 60; meanwhile, the sampling circuit 31 (31 a/31 b) and the filtering circuit 32 (32 a) are arranged behind the first stage power amplifier circuit 20 so as to sample and filter the first target audio signal output by the first stage power amplifier circuit 20, and thus the obtained sampled analog audio signal is output to the nth stage power amplifier circuit 40 so as to drive a plurality of speakers 70 in parallel through a plurality of power amplifier circuits.
Obviously, the audio signal output circuit 100 (1/1 a/1 b) provided in the present application can drive a plurality of speakers through one audio output port, and can use a digital power amplifier and an analog power amplifier in a mixed manner. Compared with the existing audio signal output circuit, the delay asynchronous phenomenon among a plurality of loudspeakers can be reduced, and the external sound quality of the electronic equipment is improved.
The above embodiments are only for illustrating the technical solution of the present application and not for limiting, and although the present application has been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application.
Claims (10)
1. An audio signal output circuit for driving a plurality of speakers, the audio signal output circuit comprising:
the control chip is used for outputting an initial audio signal;
the first-stage power amplifier circuit is used for receiving the initial audio signal and performing power amplification processing on the initial audio signal so as to output a target audio signal to the corresponding loudspeaker;
the N-stage power amplification circuit is electrically connected to the output end of any N-1-stage power amplification circuit through a sampling filter circuit, and the other end of the N-stage power amplification circuit is electrically connected to another loudspeaker, wherein N is greater than or equal to 2, the sampling filter circuit comprises a sampling circuit and a filter circuit which are electrically connected with each other, and the sampling filter circuit is used for carrying out sampling processing and filtering processing on a target audio signal output by the N-1-stage power amplification circuit so as to obtain a sampling analog audio signal and outputting the sampling analog audio signal to the N-stage power amplification circuit.
2. The audio signal output circuit according to claim 1, wherein the sampling circuit is electrically connected between any of the N-1 stage power amplifier circuits and a speaker electrically connected to the N-1 stage power amplifier circuit, and is configured to sample a target audio signal output by the N-1 stage power amplifier circuit;
the filter circuit is electrically connected to the sampling circuit and is used for acquiring a sampling signal and filtering the sampling signal to output the sampling analog audio signal, and the Nth stage power amplifier circuit is electrically connected to the output end of the filter circuit and is used for receiving the sampling analog audio signal and performing power amplification on the sampling analog audio signal to output a target audio signal to the correspondingly connected loudspeaker.
3. The audio signal output circuit according to claim 1, wherein: the first-stage power amplifier circuit comprises a first power amplifier, the first power amplifier is used for performing power amplification processing on the received initial audio signal, and the first power amplifier is a digital power amplifier or an analog power amplifier.
4. The audio signal output circuit according to claim 1, wherein: the Nth-stage power amplifier circuit comprises a second power amplifier, the second power amplifier is used for performing power amplification processing on the received sampled analog audio signals, and the second power amplifier is an analog power amplifier.
5. The audio signal output circuit according to claim 1, wherein: each sampling circuit comprises at least one voltage dividing element, and the at least one voltage dividing element is electrically connected between any N-1 stage power amplifier circuit and a loudspeaker electrically connected with the N-1 stage power amplifier circuit.
6. The audio signal output circuit according to claim 5, wherein: the at least one voltage dividing element comprises a voltage dividing resistor, the voltage dividing resistor is electrically connected between any N-1 level power amplifier circuit and a loudspeaker electrically connected with the N-1 level power amplifier circuit, and the filter circuit is electrically connected to two ends of the voltage dividing resistor and is used for acquiring the sampling signal.
7. The audio signal output circuit according to claim 5, wherein: the N-1 stage power amplifier circuit comprises a first output end and a second output end, one end of the first resistor is electrically connected between the first output end and a loudspeaker electrically connected with the first output end, the other end of the first resistor is electrically connected to the second resistor, the other end of the second resistor is electrically connected to the third resistor, the other end of the third resistor is electrically connected between the second output end and the loudspeaker electrically connected with the second output end, and the filter circuit is electrically connected to two ends of any combination of the first resistor, the second resistor and the third resistor and used for acquiring the sampling signal.
8. The audio signal output circuit according to any one of claims 6 to 7, wherein: the filter circuit comprises a first filter resistor, a second filter resistor, a first filter capacitor and a second filter capacitor, wherein one end of the first filter resistor is electrically connected to the sampling circuit, the other end of the first filter resistor is electrically connected to the first filter capacitor, the other end of the first filter capacitor is grounded, one end of the second filter resistor is electrically connected to the sampling circuit, the other end of the second filter resistor is electrically connected to the second filter capacitor, and the other end of the second filter capacitor is grounded.
9. The audio signal output circuit according to claim 8, wherein: the N-th stage power amplifier circuit comprises a first input end and a second input end, the N-th stage power amplifier circuit is electrically connected between the first filter resistor and the first filter capacitor in the corresponding connected filter circuit through the first input end, and is electrically connected between the second filter resistor and the second filter capacitor in the corresponding connected filter circuit through the second input end, so that the sampling analog audio signal output by the filter circuit is obtained.
10. An electronic device comprising at least two loudspeakers and an audio signal output circuit according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2022/116903 WO2023124188A1 (en) | 2021-12-31 | 2022-09-02 | Audio signal output circuit and electronic device |
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| CN2021116821592 | 2021-12-31 | ||
| CN202111682159 | 2021-12-31 |
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| CN202210106972.3A Active CN114501237B (en) | 2021-12-31 | 2022-01-28 | Audio signal output circuit and electronic equipment |
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| CN114501237B (en) * | 2021-12-31 | 2023-12-19 | 北京荣耀终端有限公司 | Audio signal output circuit and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008268251A (en) * | 2007-04-16 | 2008-11-06 | Yamaha Corp | Filter device and sound field support system |
| JP2008283600A (en) * | 2007-05-14 | 2008-11-20 | Pioneer Electronic Corp | Automatic sound field correction device |
| CN204206429U (en) * | 2014-08-22 | 2015-03-11 | 上海斐讯数据通信技术有限公司 | Audio signal processing |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5856759A (en) * | 1997-10-06 | 1999-01-05 | Ford Motor Company | Audio output amplifier with parallel class AB stages |
| JP2002330499A (en) * | 2001-04-27 | 2002-11-15 | Pioneer Electronic Corp | Automatic sound field correction device and computer program therefor |
| JP2005064972A (en) * | 2003-08-15 | 2005-03-10 | Sony Corp | Signal processor and signal processing method |
| KR100964378B1 (en) * | 2009-06-23 | 2010-06-25 | 한국전자통신연구원 | Digital receiver |
| CN107172537B (en) * | 2017-07-25 | 2023-09-15 | 成都德芯数字科技股份有限公司 | Signal amplifying circuit and power amplifying equipment |
| CN207053779U (en) * | 2017-08-09 | 2018-02-27 | 湖南康通电子股份有限公司 | Broadcasting equipment amplifies adjusting means |
| CN109005485A (en) * | 2018-07-28 | 2018-12-14 | 贵州航天天马机电科技有限公司 | A kind of voice power amplifier data processing circuit |
| CN210536927U (en) * | 2019-12-06 | 2020-05-15 | 深圳宇凡微电子有限公司 | Audio power amplifier chip and electronic equipment |
| CN114501237B (en) * | 2021-12-31 | 2023-12-19 | 北京荣耀终端有限公司 | Audio signal output circuit and electronic equipment |
-
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008268251A (en) * | 2007-04-16 | 2008-11-06 | Yamaha Corp | Filter device and sound field support system |
| JP2008283600A (en) * | 2007-05-14 | 2008-11-20 | Pioneer Electronic Corp | Automatic sound field correction device |
| CN204206429U (en) * | 2014-08-22 | 2015-03-11 | 上海斐讯数据通信技术有限公司 | Audio signal processing |
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| WO2023124188A1 (en) | 2023-07-06 |
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