CN114449430B - Test circuit and method for audio module - Google Patents
Test circuit and method for audio module Download PDFInfo
- Publication number
- CN114449430B CN114449430B CN202111625580.XA CN202111625580A CN114449430B CN 114449430 B CN114449430 B CN 114449430B CN 202111625580 A CN202111625580 A CN 202111625580A CN 114449430 B CN114449430 B CN 114449430B
- Authority
- CN
- China
- Prior art keywords
- resistor
- audio
- module
- electrically connected
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title abstract description 14
- 238000012545 processing Methods 0.000 claims abstract description 42
- 238000001514 detection method Methods 0.000 claims abstract description 40
- 239000003990 capacitor Substances 0.000 claims description 68
- 230000003321 amplification Effects 0.000 claims description 15
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 15
- 238000010998 test method Methods 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 8
- 230000010363 phase shift Effects 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
-
- 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
Landscapes
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The invention provides a test circuit and a method for an audio module, wherein the test circuit comprises a controller, a signal generator and a filter amplifier; the audio module comprises an audio input unit, an audio output unit and an audio processing unit; the controller is connected with the audio processing unit, the signal generator and the filter amplifier, the signal generator is also connected with the audio input unit, and the filter amplifier is also connected with the audio output unit and the audio processing unit; the signal generator sends a sine wave signal to the audio input unit; the audio module is used for recording the sine wave to obtain a recording signal, and the recording signal is sent to the filter amplifier; the filter amplifier converts the recording signal into a direct current signal and sends the direct current signal to the audio processing unit; the audio processing unit detects whether the voltage of the direct current signal is within a preset voltage range, generates a detection result and sends the detection result to the controller. The invention realizes automatic testing of the audio module, can effectively shorten the testing time and improve the testing efficiency.
Description
Technical Field
The present invention relates to electronic device testing, and more particularly, to a testing circuit and method for an audio module.
Background
In the field of electronic communication, most communication modules have analog audio interfaces, which include microphone interfaces and speaker interfaces; the analog audio signal represents the information content in terms of the amplitude of the analog voltage, which is continuous in time.
The reliability test can be carried out on the audio interfaces of the products in the production process of the electronic device products, and the audio interfaces need to be tested one by one manually, so that the reliability test of the audio interfaces in the mass production process has the defects of low production efficiency, long time period, huge personnel workload, errors in manual test and the like.
Disclosure of Invention
The invention aims to overcome the defects of low production efficiency, long time period, huge personnel workload, errors in manual test and the like in the reliability test of an audio interface in the mass production process in the prior art, and provides a test circuit and a test method for an audio module.
The invention solves the technical problems by the following technical scheme:
the invention provides a test circuit for an audio module, which comprises: a controller, a signal generator and a filter amplifier;
the audio module comprises an audio input unit, an audio output unit and an audio processing unit;
the controller is respectively and electrically connected with the signal generator and the filter amplifier, the signal generator is also electrically connected with the audio input unit, the audio output unit is electrically connected with the filter amplifier, the filter amplifier is also electrically connected with the audio processing unit, and the audio processing unit is also electrically connected with the controller;
the signal generator is used for sending sine wave signals to the audio input unit;
the audio module is used for recording the received sine wave to obtain a recording signal and sending the recording signal to the filter amplifier;
the filter amplifier is used for converting the received recording signal into a direct current signal and sending the direct current signal to an audio processing unit of the audio module;
the audio processing unit is used for detecting whether the voltage of the direct current signal is within a preset voltage range, generating a detection result and sending the detection result to the controller.
Preferably, the signal generator comprises a phase-shifted oscillator;
the phase-shifting oscillator is respectively and electrically connected with the controller and the audio input unit;
the phase-shifted oscillator is configured to transmit a sine wave signal to the audio input unit.
Preferably, the phase-shifting oscillator comprises a phase-shifting frequency selection module and a first amplifying module;
the output end of the phase-shifting frequency selection module is electrically connected with the input end of the first amplification module, and the output end of the first amplification module is electrically connected with the audio input unit of the audio module;
the phase-shifting frequency selection module is used for generating a sine wave with adjustable frequency and transmitting the sine wave to the first amplifying module;
the first amplifying module is used for amplifying the received sine wave signals and sending the amplified sine wave signals to the audio module.
Preferably, the phase-shift frequency selection module includes: the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the first triode;
the second end of the first resistor is electrically connected with the second end of the third capacitor, the first end of the fifth resistor and the base electrode of the first triode respectively, the second end of the second resistor is electrically connected with the collector electrode of the first triode and the first end of the first capacitor respectively, the second end of the first capacitor is electrically connected with the first end of the second capacitor and the first end of the third resistor respectively, the second end of the second capacitor is electrically connected with the first end of the third capacitor and the first end of the fourth resistor respectively, and the emitter electrode of the first triode is electrically connected with the first end of the sixth resistor and the first end of the fourth capacitor respectively;
the collector of the first triode is also electrically connected with the input end of the first amplifying module.
Preferably, the controller is further configured to set parameter values of the first capacitor, the second capacitor, the third resistor, the fourth resistor, and the fifth resistor, so as to set a frequency of the sine wave;
the controller is further configured to set parameter values of the first resistor and the fifth resistor to set an amplitude of the sine wave.
Preferably, the first amplifying module includes a common collector amplifier.
Preferably, the common collector amplifier includes: the fifth capacitor, the seventh resistor, the eighth resistor, the ninth resistor and the second triode;
the output end of the phase-shifting frequency selection module is electrically connected with the first end of the fifth capacitor, the second end of the fifth capacitor is respectively electrically connected with the second end of the seventh resistor, the first end of the eighth resistor and the base electrode of the second triode, and the emitter electrode of the second triode is electrically connected with the first end of the ninth resistor;
the emitter of the second triode is also electrically connected with the audio input unit of the audio module.
Preferably, the filter amplifier comprises a common emitter amplifier.
Preferably, the common emitter amplifier includes: a sixth capacitor, a seventh capacitor, an eighth capacitor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a third transistor;
the audio output unit of the audio module is electrically connected with the first end of the sixth capacitor, the second end of the sixth capacitor is electrically connected with the second end of the tenth resistor and the base electrode of the third triode respectively, the second end of the eleventh resistor is electrically connected with the collector electrode of the third triode and the first end of the twelfth resistor respectively, the second end of the twelfth resistor is electrically connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is electrically connected with the first end of the seventh capacitor and the first end of the fourteenth resistor respectively, and the second end of the fourteenth resistor is electrically connected with the first end of the eighth capacitor and the first end of the fifteenth resistor respectively;
the second end of the fourteenth resistor is also electrically connected with the audio processing unit of the audio module.
The invention also provides a test method for the audio module, which utilizes the test circuit for the audio module, and comprises the following steps:
a signal generator in the test circuit sends sine waves to an audio input unit of the audio module;
the audio module records the received sine wave to obtain a recording signal, and sends the recording signal to a filter amplifier in the test circuit;
the filter amplifier converts the received recording signal into a direct current signal and sends the direct current signal to an audio processing unit of the audio module;
the audio processing unit detects whether the voltage of the direct current signal is within a preset voltage range, generates a detection result and sends the detection result to a controller in the test circuit;
if the voltage of the direct current signal is within a preset voltage range, the detection result is normal; if the voltage of the direct current signal is not within the preset voltage range, the detection result is abnormal.
Preferably, the signal generator comprises a phase-shifted oscillator;
the step of sending a sine wave to an audio input unit of the audio module by a signal generator in the test circuit specifically comprises the following steps:
the phase-shifted oscillator transmits a sine wave signal to the audio input unit.
Preferably, the phase-shifting oscillator comprises a phase-shifting frequency selection module and a first amplifying module;
the step of transmitting a sine wave signal to the audio input unit by the phase-shifting oscillator specifically comprises:
the phase-shifting frequency selection module generates a sine wave with adjustable frequency and sends the sine wave to the first amplifying module;
and the first amplification module performs signal amplification processing on the received sine wave and sends the amplified sine wave to the audio module.
Preferably, the test method further comprises:
the controller sets parameter values of the first capacitor, the second capacitor, the third resistor, the fourth resistor and the fifth resistor to set the frequency of the sine wave;
the controller sets parameter values of the first resistor and the fifth resistor to set an amplitude of the sine wave.
The invention has the positive progress effects that: the method comprises the steps that a sine wave signal is sent to an audio module through a signal generator in a test circuit, the audio module processes the sine wave signal and then outputs a recording signal to a filter amplifier in the test circuit, the filter amplifier converts the recording signal into a direct current signal and sends the direct current signal to an audio processing unit of the audio module, the audio processing unit detects whether the voltage of the direct current signal is within a preset voltage range or not and generates a detection result, the detection result is sent to a controller in the test circuit, and if the voltage of the direct current signal is within the preset voltage range, the detection result is normal; otherwise, the detection result is abnormal, so that the automatic test of the audio module is realized, the test time can be effectively shortened, the test efficiency is improved, and the test error is reduced.
Drawings
Fig. 1 is a block diagram of a test circuit for an audio module according to embodiment 1 of the present invention.
Fig. 2 is a block diagram of an embodiment of a test circuit for an audio module according to embodiment 1 of the present invention.
Fig. 3 is a circuit diagram of a specific embodiment of a signal generator in a test circuit for an audio module according to embodiment 1 of the present invention.
Fig. 4 is a circuit diagram of a specific implementation of a filter amplifier in a test circuit for an audio module according to embodiment 1 of the present invention.
Fig. 5 is a flowchart of a testing method for an audio module according to embodiment 2 of the present invention.
Fig. 6 is a flowchart of a specific embodiment of step S11 in the test method for an audio module according to embodiment 2 of the present invention.
Fig. 7 is a flowchart of a specific implementation of step S111 in the test method for an audio module according to embodiment 2 of the present invention.
Fig. 8 is a flowchart of a testing method for an audio module according to embodiment 2 of the present invention.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
The present embodiment provides a test circuit for an audio module, referring to fig. 1, the test circuit includes: a controller 1, a signal generator 2 and a filter amplifier 3.
The audio module comprises an audio input unit, an audio output unit and an audio processing unit.
The controller 1 is electrically connected with the signal generator 2 and the filter amplifier 3 respectively, the signal generator 2 is also electrically connected with the audio input unit, the audio output unit is electrically connected with the filter amplifier 3, the filter amplifier 3 is also electrically connected with the audio processing unit, and the audio processing unit is also electrically connected with the controller 1.
The signal generator 2 is for transmitting a sine wave signal to the audio input unit.
The audio module is used for recording the received sine wave to obtain a recording signal, and sending the recording signal to the filter amplifier 3.
The filter amplifier 3 is configured to convert the received recording signal into a dc signal, and send the dc signal to an audio processing unit of the audio module.
The audio processing unit is used for detecting whether the voltage of the direct current signal is within a preset voltage range, generating a detection result, and sending the detection result to the controller 1.
The audio input unit of the audio module may be a microphone input interface, the audio output unit may be a speaker output interface, and the audio processing unit may be an ADC (Analog to Digital Converter, analog-to-digital converter) unit.
The method comprises the steps that a sine wave signal is sent to an audio module through a signal generator in a test circuit, the audio module processes the sine wave signal and then outputs a recording signal to a filter amplifier in the test circuit, the filter amplifier converts the recording signal into a direct current signal and sends the direct current signal to an audio processing unit of the audio module, the audio processing unit detects whether the voltage of the direct current signal is within a preset voltage range or not and generates a detection result, the detection result is sent to a controller in the test circuit, and if the voltage of the direct current signal is within the preset voltage range, the detection result is normal; otherwise, the detection result is abnormal, so that the automatic test of the audio module is realized, the test time can be effectively shortened, the test efficiency is improved, and the test error is reduced.
In particular, with reference to fig. 2, the signal generator 2 comprises a phase-shifted oscillator 21.
The phase-shift oscillator 21 is electrically connected to the controller 1 and the audio input unit, respectively.
The phase-shifted oscillator 21 is used to transmit a sine wave signal to the audio input unit.
The present embodiment further provides a specific implementation of the signal generator.
In particular, the phase-shifted oscillator 21 includes a phase-shifted frequency selection module 211 and a first amplification module 212.
The output end of the phase-shift frequency selection module 211 is electrically connected with the input end of the first amplification module 212, and the output end of the first amplification module 212 is electrically connected with the audio input unit of the audio module.
The phase shift frequency selection module 211 is configured to generate a sine wave with an adjustable frequency, and send the sine wave to the first amplification module 212.
The first amplifying module 212 is configured to amplify the received sine wave, and send the amplified sine wave to the audio module.
The present embodiment further provides a specific implementation of the phase-shifted oscillator.
In specific implementation, referring to fig. 3, the phase shift frequency selection module 211 includes: the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the first triode Q1.
The power supply voltage (for example, 3.3 volts) is electrically connected to the first end of the first resistor R1 and the first end of the second resistor R2, the second end of the first resistor R1 is electrically connected to the second end of the third resistor C3, the first end of the fifth resistor R5 and the base of the first transistor Q1, the second end of the second resistor R2 is electrically connected to the collector of the first transistor Q1 and the first end of the first resistor C1, the second end of the first resistor C1 is electrically connected to the first end of the second resistor C2 and the first end of the third resistor R3, the second end of the second resistor C2 is electrically connected to the first end of the third resistor C3 and the first end of the fourth resistor R4, the emitter of the first transistor Q1 is electrically connected to the first end of the sixth resistor R6 and the first end of the fourth resistor C4, and the second end of the third resistor R3, the second end of the fourth resistor R4, the second end of the fifth resistor R5, the second end of the fourth resistor R6 and the fourth end of the fourth resistor C4 are all grounded.
The collector of the first transistor Q1 is also electrically connected to the input of the first amplifying module 212.
The embodiment further provides a specific implementation mode of the phase-shift frequency selection module.
In specific implementation, the controller 1 is further configured to set parameter values of the first capacitor C1, the second capacitor C2, the third capacitor C3, the third resistor R3, the fourth resistor R4, and the fifth resistor R5, so as to set a frequency of the sine wave.
The controller 1 is also used to set the parameter values of the first resistor R1 and the fifth resistor R5 to set the amplitude of the sine wave.
According to the embodiment, the frequency and the amplitude of the sine wave can be set by setting the parameter values, so that the sine wave can adapt to the testing requirements of different audio modules, and the automatic testing of the different audio modules is completed.
In particular implementations, the first amplification module 212 includes a common collector amplifier.
The present embodiment further provides a specific implementation of the first amplifying module.
In particular implementation, referring to fig. 3, the common collector amplifier 2121 includes: a fifth capacitor C5, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a second transistor Q2.
The output end of the phase-shifting frequency selection module 211 is electrically connected to the first end of the fifth capacitor C5, the power supply voltage (for example, 3.3 volts) is electrically connected to the first end of the seventh resistor R7 and the collector of the second triode Q2, the second end of the fifth capacitor C5 is electrically connected to the second end of the seventh resistor R7, the first end of the eighth resistor R8 and the base of the second triode Q2, the emitter of the second triode Q2 is electrically connected to the first end of the ninth resistor R9, and the second end of the eighth resistor R8 and the second end of the ninth resistor R9 are both grounded.
The emitter of the second triode Q2 is also electrically connected with an audio input unit of the audio module (transmits a sine wave signal MIC).
The fifth capacitor C5 is a blocking capacitor. The common collector amplifying circuit has the characteristics of high input impedance and small output impedance, and can be matched with different modules under the condition that the rear end is connected with the modules
The present embodiment further provides a specific implementation of the common collector amplifier.
This embodiment uses a phase-shifted oscillator circuit as shown in fig. 3 to generate a sine wave with a frequency of 1kHz and a peak-to-peak value of 1V (volt). The basic structure of the phase-shifting oscillator consists of a phase-shifting frequency selection module and a common collector amplifier, the frequency range of sound is 20Hz (hertz) -20kHz, and the phase-shifting oscillator can completely meet the frequency requirement and has extremely low cost.
In practice, the filter amplifier 3 comprises a common emitter amplifier.
The present embodiment further provides a specific implementation of the filter amplifier.
In particular implementation, referring to fig. 4, the common emitter amplifier includes: a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a third transistor Q3.
The audio output unit of the audio module is electrically connected with the first end of the sixth capacitor C6 (transmits the recording signal SPK), the power supply Voltage (VBAT) is electrically connected with the first end of the tenth resistor R10 and the first end of the eleventh resistor R11, the second end of the sixth resistor C6 is electrically connected with the second end of the tenth resistor R10 and the base of the third triode Q3, the second end of the eleventh resistor R11 is electrically connected with the collector of the third triode Q3 and the first end of the twelfth resistor R12, the second end of the twelfth resistor R12 is electrically connected with the first end of the thirteenth resistor R13, the second end of the thirteenth resistor R13 is electrically connected with the first end of the seventh resistor C7 and the first end of the fourteenth resistor R14, the second end of the fourteenth resistor R14 is electrically connected with the first end of the eighth capacitor C8 and the first end of the fifteenth resistor R15, and the third resistor Q3 and the third resistor C8 and the third end of the triode Q15 are all grounded.
The second end of the fourteenth resistor R14 is further electrically connected to the audio processing unit of the audio module (transmitting a dc signal ADC).
The output power of the speaker of most audio modules is low, and the common emitter amplifying circuit can amplify the output recording signal, and the signal is converted into a direct current signal through a circuit formed by a thirteenth resistor R13 and a seventh capacitor C7 after being amplified.
The present embodiment further provides a specific implementation of the common emitter amplifier.
The method comprises the steps that a sine wave signal is sent to an audio module through a signal generator in a test circuit, the audio module processes the sine wave signal and then outputs a recording signal to a filter amplifier in the test circuit, the filter amplifier converts the recording signal into a direct current signal and sends the direct current signal to an audio processing unit of the audio module, the audio processing unit detects whether the voltage of the direct current signal is within a preset voltage range or not and generates a detection result, the detection result is sent to a controller in the test circuit, and if the voltage of the direct current signal is within the preset voltage range, the detection result is normal; otherwise, the detection result is abnormal, and the frequency and the amplitude of the sine wave can be set by setting the parameter value, so that the automatic test of the audio module is realized, the test time can be effectively shortened, the test efficiency is improved, the test error is reduced, the sine wave can adapt to the test requirements of different audio modules, and the automatic test of different audio modules is completed.
Example 2
The present embodiment provides a test method for an audio module, the test method using the test circuit for an audio module in embodiment 1, referring to fig. 5, the test method includes:
s11, a signal generator in the test circuit sends sine waves to an audio input unit of the audio module.
S12, recording the received sine wave by the audio module to obtain a recording signal, and sending the recording signal to a filter amplifier in the test circuit.
S13, the filter amplifier converts the received recording signal into a direct current signal and sends the direct current signal to an audio processing unit of the audio module.
S14, the audio processing unit detects whether the voltage of the direct current signal is within a preset voltage range, generates a detection result and sends the detection result to a controller in the test circuit.
If the voltage of the direct current signal is within the preset voltage range, the detection result is normal; if the voltage of the direct current signal is not within the preset voltage range, the detection result is abnormal.
The method comprises the steps that a sine wave signal is sent to an audio module through a signal generator in a test circuit, the audio module processes the sine wave signal and then outputs a recording signal to a filter amplifier in the test circuit, the filter amplifier converts the recording signal into a direct current signal and sends the direct current signal to an audio processing unit of the audio module, the audio processing unit detects whether the voltage of the direct current signal is within a preset voltage range or not and generates a detection result, the detection result is sent to a controller in the test circuit, and if the voltage of the direct current signal is within the preset voltage range, the detection result is normal; otherwise, the detection result is abnormal, so that the automatic test of the audio module is realized, the test time can be effectively shortened, the test efficiency is improved, and the test error is reduced.
In particular embodiments, the signal generator comprises a phase-shifted oscillator.
Referring to fig. 6, step S11 specifically includes:
s111, the phase-shifting oscillator sends sine wave signals to the audio input unit.
The present embodiment further provides a specific implementation of the control signal generator.
In specific implementation, the phase-shifting oscillator comprises a phase-shifting frequency selection module and a first amplifying module.
Referring to fig. 7, step S111 specifically includes:
s1111, the phase-shift frequency selection module generates a sine wave with adjustable frequency and sends the sine wave to the first amplification module.
S1112, the first amplifying module amplifies the received sine wave and sends the amplified sine wave to the audio module.
The present embodiment further provides a specific implementation for controlling the phase-shifted oscillator.
Referring to fig. 8, in implementation, the testing method further includes:
s15, the controller sets parameter values of the first capacitor, the second capacitor, the third resistor, the fourth resistor and the fifth resistor to set the frequency of the sine wave.
S16, the controller sets parameter values of the first resistor and the fifth resistor to set the amplitude of the sine wave.
The method comprises the steps that a sine wave signal is sent to an audio module through a signal generator in a test circuit, the audio module processes the sine wave signal and then outputs a recording signal to a filter amplifier in the test circuit, the filter amplifier converts the recording signal into a direct current signal and sends the direct current signal to an audio processing unit of the audio module, the audio processing unit detects whether the voltage of the direct current signal is within a preset voltage range or not and generates a detection result, the detection result is sent to a controller in the test circuit, and if the voltage of the direct current signal is within the preset voltage range, the detection result is normal; otherwise, the detection result is abnormal, and the frequency and the amplitude of the sine wave can be set by setting the parameter value, so that the automatic test of the audio module is realized, the test time can be effectively shortened, the test efficiency is improved, the test error is reduced, the sine wave can adapt to the test requirements of different audio modules, and the automatic test of different audio modules is completed.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.
Claims (8)
1. A test circuit for an audio module, comprising: a controller, a signal generator and a filter amplifier;
the audio module comprises an audio input unit, an audio output unit and an audio processing unit;
the controller is respectively and electrically connected with the signal generator and the filter amplifier, the signal generator is also electrically connected with the audio input unit, the audio output unit is electrically connected with the filter amplifier, the filter amplifier is also electrically connected with the audio processing unit, and the audio processing unit is also electrically connected with the controller;
the signal generator is used for sending sine wave signals to the audio input unit;
the audio module is used for recording the received sine wave to obtain a recording signal and sending the recording signal to the filter amplifier;
the filter amplifier is used for converting the received recording signal into a direct current signal and sending the direct current signal to an audio processing unit of the audio module;
the audio processing unit is used for detecting whether the voltage of the direct current signal is within a preset voltage range or not, generating a detection result and sending the detection result to the controller;
the signal generator comprises a phase-shifted oscillator; the phase-shifting oscillator comprises a phase-shifting frequency selection module and a first amplifying module;
the output end of the phase-shifting frequency selection module is electrically connected with the input end of the first amplification module, and the output end of the first amplification module is electrically connected with the audio input unit of the audio module;
the phase-shifting frequency selection module is used for generating a sine wave with adjustable frequency and transmitting the sine wave to the first amplifying module;
the first amplifying module is used for amplifying the received sine wave signals and sending the amplified sine wave signals to the audio module.
2. The test circuit for an audio module of claim 1, wherein the phase shift frequency selection module comprises: the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor and the first triode;
the second end of the first resistor is electrically connected with the second end of the third capacitor, the first end of the fifth resistor and the base electrode of the first triode respectively, the second end of the second resistor is electrically connected with the collector electrode of the first triode and the first end of the first capacitor respectively, the second end of the first capacitor is electrically connected with the first end of the second capacitor and the first end of the third resistor respectively, the second end of the second capacitor is electrically connected with the first end of the third capacitor and the first end of the fourth resistor respectively, and the emitter electrode of the first triode is electrically connected with the first end of the sixth resistor and the first end of the fourth capacitor respectively;
the collector of the first triode is also electrically connected with the input end of the first amplifying module.
3. The test circuit for an audio module of claim 2, wherein the controller is further configured to set parameter values of the first capacitor, the second capacitor, the third resistor, the fourth resistor, and the fifth resistor to set a frequency of the sine wave;
the controller is further configured to set parameter values of the first resistor and the fifth resistor to set an amplitude of the sine wave.
4. The test circuit for an audio module of claim 1, wherein the first amplification module comprises a common collector amplifier.
5. The test circuit for an audio module of claim 4, wherein the common collector amplifier comprises: the fifth capacitor, the seventh resistor, the eighth resistor, the ninth resistor and the second triode;
the output end of the phase-shifting frequency selection module is electrically connected with the first end of the fifth capacitor, the second end of the fifth capacitor is respectively electrically connected with the second end of the seventh resistor, the first end of the eighth resistor and the base electrode of the second triode, and the emitter electrode of the second triode is electrically connected with the first end of the ninth resistor;
the emitter of the second triode is also electrically connected with the audio input unit of the audio module.
6. The test circuit for an audio module of claim 1, wherein the filter amplifier comprises a common emitter amplifier.
7. The test circuit for an audio module of claim 6, wherein the common emitter amplifier comprises: a sixth capacitor, a seventh capacitor, an eighth capacitor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, and a third transistor;
the audio output unit of the audio module is electrically connected with the first end of the sixth capacitor, the second end of the sixth capacitor is electrically connected with the second end of the tenth resistor and the base electrode of the third triode respectively, the second end of the eleventh resistor is electrically connected with the collector electrode of the third triode and the first end of the twelfth resistor respectively, the second end of the twelfth resistor is electrically connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is electrically connected with the first end of the seventh capacitor and the first end of the fourteenth resistor respectively, and the second end of the fourteenth resistor is electrically connected with the first end of the eighth capacitor and the first end of the fifteenth resistor respectively;
the second end of the fourteenth resistor is also electrically connected with the audio processing unit of the audio module.
8. A test method for an audio module, wherein the test method utilizes the test circuit for an audio module as claimed in any one of claims 1 to 7, the test method comprising:
a signal generator in the test circuit sends sine waves to an audio input unit of the audio module;
the audio module records the received sine wave to obtain a recording signal, and sends the recording signal to a filter amplifier in the test circuit;
the filter amplifier converts the received recording signal into a direct current signal and sends the direct current signal to an audio processing unit of the audio module;
the audio processing unit detects whether the voltage of the direct current signal is within a preset voltage range, generates a detection result and sends the detection result to a controller in the test circuit;
if the voltage of the direct current signal is within a preset voltage range, the detection result is normal; if the voltage of the direct current signal is not within the preset voltage range, the detection result is abnormal;
the signal generator comprises a phase-shifted oscillator; the phase-shifting oscillator comprises a phase-shifting frequency selection module and a first amplifying module;
the phase-shifting frequency selection module generates a sine wave with adjustable frequency and sends the sine wave to the first amplifying module;
and the first amplification module performs signal amplification processing on the received sine wave and sends the amplified sine wave to the audio module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111625580.XA CN114449430B (en) | 2021-12-28 | 2021-12-28 | Test circuit and method for audio module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111625580.XA CN114449430B (en) | 2021-12-28 | 2021-12-28 | Test circuit and method for audio module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114449430A CN114449430A (en) | 2022-05-06 |
| CN114449430B true CN114449430B (en) | 2024-02-02 |
Family
ID=81366774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111625580.XA Active CN114449430B (en) | 2021-12-28 | 2021-12-28 | Test circuit and method for audio module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114449430B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1282853A (en) * | 1969-01-30 | 1972-07-26 | Int Standard Electric Corp | Oscillator arrangement |
| US4039750A (en) * | 1974-07-12 | 1977-08-02 | Hull Robert E | Audio frequency phase modulator in hearing test system |
| JPS5625866A (en) * | 1979-08-10 | 1981-03-12 | Nippon Telegr & Teleph Corp <Ntt> | Transmission system of communication signal |
| US4314374A (en) * | 1977-11-10 | 1982-02-02 | Westinghouse Air Brake Company | High power audio frequency transmitter |
| CN101771741A (en) * | 2008-12-29 | 2010-07-07 | 深圳富泰宏精密工业有限公司 | Audio channel detecting system and method thereof |
| CN202103852U (en) * | 2011-04-28 | 2012-01-04 | 刘家发 | Audio signal generator prepared by single transistor |
| CN104333837A (en) * | 2014-09-22 | 2015-02-04 | 深圳市江波龙电子有限公司 | Audio hardware equipment detection method and system |
-
2021
- 2021-12-28 CN CN202111625580.XA patent/CN114449430B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1282853A (en) * | 1969-01-30 | 1972-07-26 | Int Standard Electric Corp | Oscillator arrangement |
| US4039750A (en) * | 1974-07-12 | 1977-08-02 | Hull Robert E | Audio frequency phase modulator in hearing test system |
| US4314374A (en) * | 1977-11-10 | 1982-02-02 | Westinghouse Air Brake Company | High power audio frequency transmitter |
| JPS5625866A (en) * | 1979-08-10 | 1981-03-12 | Nippon Telegr & Teleph Corp <Ntt> | Transmission system of communication signal |
| CN101771741A (en) * | 2008-12-29 | 2010-07-07 | 深圳富泰宏精密工业有限公司 | Audio channel detecting system and method thereof |
| CN202103852U (en) * | 2011-04-28 | 2012-01-04 | 刘家发 | Audio signal generator prepared by single transistor |
| CN104333837A (en) * | 2014-09-22 | 2015-02-04 | 深圳市江波龙电子有限公司 | Audio hardware equipment detection method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114449430A (en) | 2022-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110290359B (en) | Camera signal transmission system | |
| CN1960175B (en) | Method and apparatus to control output power of a power amplifier and audio player having the same | |
| US20110026739A1 (en) | High level capable audio amplification circuit | |
| CN110324431B (en) | User data management system based on cloud computing | |
| CN110988579B (en) | Power grid fault real-time monitoring system | |
| CN110376989B (en) | Industrial control system based on big data | |
| WO2014164233A1 (en) | Reducing audio distortion in an audio system | |
| CN105704634A (en) | Feedback audio output detection method and device | |
| CN103379419A (en) | Audio frequency access test system | |
| CN114449430B (en) | Test circuit and method for audio module | |
| TW201328189A (en) | Signal processing system and method | |
| CN205754856U (en) | For testing the device of multiple speaker | |
| CN207817140U (en) | A kind of acquisition of driving voltage and control device | |
| CN211919150U (en) | Water-soluble fertilizer finished product weighing system | |
| CN111245376A (en) | Electrical cabinet remote monitoring system based on Internet of things | |
| CN210487857U (en) | Fault information mining system based on big data | |
| CN202406292U (en) | Reliability testing system for piezoelectric ceramic loudspeaker | |
| CN220653545U (en) | Audio detection circuit and chip | |
| CN117572018A (en) | Measuring circuit and measuring device | |
| CN203775413U (en) | Vehicle audio system testing device | |
| KR100650709B1 (en) | Meansurement system of noise with c-microphone | |
| CN108028630A (en) | Integrated circuit, circuit unit and the method for its operation | |
| CN112511115B (en) | Composite signal amplifying circuit and signal generator | |
| JP2016123028A (en) | Capacitor microphone and microphone circuit for use therein | |
| CN115567007B (en) | Power amplifier direct current operating point tracking circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |