CN212990672U - Voice wake-up test circuit - Google Patents
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Abstract
The present disclosure relates to a voice wake-up test circuit, comprising: pulse density modulation converters and voice systems; the input end of the pulse density modulation converter is used for receiving the audio analog signal, the output end of the pulse density modulation converter is connected with the signal input end of a microphone interface of the voice system, and the pulse density modulation converter is used for converting the audio analog signal into a pulse density modulation signal; and transmitting the pulse density modulation signal to a voice system to carry out awakening test of the voice system. Therefore, the problems of test interference among the experiment racks and waste of space and financial resources in the existing scheme can be solved; namely, the pulse density modulation converter is used for converting the analog audio signal into the pulse density modulation signal, and the pulse density modulation signal is used for performing wake-up test, so that the automatic wake-up test of a voice system can be realized without making sound, and the test interference is avoided; and a plurality of experiment platforms can be tested in a limited space, so that the space can be saved, and the waste of space and financial resources can be reduced.
Description
Technical Field
The present disclosure relates to audio testing technologies, and in particular, to a voice wake-up testing circuit.
Background
In recent years, with the development of automobile intelligence, voice technology, such as automobile Audio Bus (A2B) Bus Microphone (MIC) voice technology, has become one of the configurations of contemporary automobiles. The voice technology can replace various original operations which need to be carried out manually, and the driving safety is improved. In order to ensure the stability and reliability of the A2B bus MIC voice system, the system needs to be tested.
However, in the existing testing method, voice equipment is awakened by audible sound, for example, an external speaker is used to play an awakening word for voice awakening, which may interfere with the testing of other experiment racks; if the test bench is separately arranged in a quiet space, the waste of space and financial resources is caused.
SUMMERY OF THE UTILITY MODEL
To solve the above technical problem or to at least partially solve the above technical problem, the present disclosure provides a voice wake-up test circuit.
The embodiment of the present disclosure provides a voice wake-up test circuit, which includes: pulse density modulation converters and voice systems;
the input end of the pulse density modulation converter is used for receiving an audio analog signal, the output end of the pulse density modulation converter is connected with the microphone interface signal input end of the voice system, and the pulse density modulation converter is used for converting the audio analog signal into a pulse density modulation signal; and transmitting the pulse density modulation signal to the voice system to carry out awakening test of the voice system.
Optionally, the pulse density modulation converter includes a pulse density modulation signal conversion chip, a first resistor, a second resistor, a first capacitor, and a second capacitor;
the first resistor and the first capacitor are connected in series at an input interface end of the pulse density modulation signal conversion chip, and the first capacitor is connected in series between the first resistor and the pulse density modulation signal conversion chip; the second resistor and the second capacitor are connected in series between the input end of the pulse density modulation converter and the ground, and the second capacitor is connected in series between the second resistor and the ground.
Optionally, a power interface of the pulse density modulation signal conversion chip is electrically connected to a power end of a microphone interface of the speech system.
Optionally, a clock signal interface of the pulse density modulation signal conversion chip is electrically connected to a microphone interface clock end of the speech system.
Optionally, the voice wake-up test circuit further includes a sound card and an attenuator;
the attenuator is connected in series between the sound card and the pulse density modulation converter;
the attenuator is used for attenuating the amplitude of the received audio analog signal with the first amplitude output by the sound card to a second amplitude and outputting the audio analog signal to the pulse density modulation converter; the first amplitude and the second amplitude are amplitudes corresponding to the same audio frequency analog signal and have different sizes, and the second amplitude is smaller than the first amplitude.
Optionally, the attenuator comprises a resistor network with a preset attenuation ratio.
Optionally, the resistor network with the preset attenuation ratio includes a third capacitor, a third resistor and a fourth resistor;
the third capacitor and the third resistor are connected in series between the input end and the output end of the attenuator, and the third resistor is connected in series between the third capacitor and the output end of the attenuator; the fourth resistor is connected between the output end of the attenuator and the ground in series.
Optionally, the voice wake-up test circuit further includes a sound source terminal, and an input end of the sound card is connected to an output end of the sound source terminal;
and the input end of the sound card is used for receiving initial audio data output by the sound source terminal.
Optionally, the sound card is connected to the sound source terminal through a universal serial bus.
Optionally, the sound source terminal includes a car audio bus.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the technical scheme of the embodiment of the disclosure can solve the problems that the voice equipment awakened by audible sound interferes with the test of other experiment racks in the existing scheme, and if the test experiment rack is placed in a quiet space, the waste of space and financial resources can be caused; meanwhile, a plurality of experiment platforms can be tested in a limited space, so that the space is saved, and the waste of space and financial resources is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a voice wake-up test circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another embodiment of a voice wake-up test circuit;
FIG. 3 is a schematic diagram of a voice wake-up test circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another voice wake-up test circuit according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Fig. 1 is a schematic structural diagram of a voice wake-up test circuit according to an embodiment of the present disclosure. Referring to fig. 1, the voice wake-up test circuit includes: a Pulse Density Modulation (PDM) converter 11 and a voice system 12; an input end of the PDM converter 11 is configured to receive an audio analog signal, an output end of the PDM converter 11 is connected to a signal input end of a microphone interface (hereinafter, also referred to as "MIC interface") of the speech system 12, and the PDM converter 11 is configured to convert the audio analog signal into a PDM signal; the PDM signal is transmitted to the voice system 12 for performing a wake-up test of the voice system 12.
Wherein, PDM is a modulation mode which uses binary number 0 or 1 to represent analog signals; in the PDM signal, the amplitude of the analog signal is represented using the density of the corresponding region of the output pulse. The PDM converter 11 may convert the received audio analog signal into a PDM signal (also referred to as "PDM data") and transmit the PDM signal to the voice system 12, where the voice system 12 is a system that operates in response to the PDM signal output by the PDM converter 11, and may be, for example, a vehicle-mounted display system or a vehicle-mounted voice broadcast system, and the embodiment of the disclosure is not limited thereto.
In the embodiment of the present disclosure, the PDM signal is directly output from the PDM converter 11 to the MIC interface signal input terminal of the speech system 12, instead of being output to the microphone interface in the prior art. In this way, the PDM converter 11 can output a signal that matches the audio signal into which the microphone converts the sound, that is, the PDM signal described above, which is transmitted to the speech system 12, so that the voice wake-up test can be implemented without emitting the sound.
In the voice wake-up test circuit provided by the embodiment of the disclosure, the PDM converter 11 is used to convert the analog audio signal into the PDM signal, and the PDM signal is transmitted to the voice system 12 to perform the wake-up test of the voice system 12, so that the automatic wake-up test of the voice system 12 can be realized without making a sound, and the interference to other experiment racks can be avoided; meanwhile, a plurality of experiment platforms can be tested in a limited space, so that the space is saved, and the waste of space and financial resources is reduced.
In an embodiment, fig. 2 is a schematic structural diagram of another voice wake-up test circuit according to an embodiment of the present disclosure. On the basis of fig. 1, referring to fig. 2, the pulse density modulation converter 11 includes a pulse density modulation signal conversion chip 111, a first resistor 112, a second resistor 113, a first capacitor 114, and a second capacitor 115; the first resistor 112 and the first capacitor 114 are connected in series to the input interface of the pwm signal converting chip 111, and the first capacitor 114 is connected in series between the first resistor 112 and the pwm signal converting chip 111; the second resistor 113 and the second capacitor 115 are connected in series between the input terminal of the pulse density modulation converter 11 and the ground, and the second capacitor 115 is connected in series between the second resistor 113 and the ground.
The first resistor 112 is connected in series with the first capacitor 114, and the second resistor 113 is connected in series with the second capacitor 115, so that peak voltages in the two branches can be correspondingly absorbed, and interference is reduced; therefore, the signal-to-noise ratio of the audio analog signal input to the PDM signal conversion chip 111 is improved, and the accuracy of the voice awakening test is improved.
Illustratively, a first end of the first resistor 112 and a first end of the second resistor 113 are both input ends of the PDM converter 11, a second end of the first resistor 112 is electrically connected to a first end of the first capacitor 114, and a second end of the first capacitor 114 is grounded; a second end of the second resistor 113 is electrically connected to a first end of the second capacitor 115, a second end of the second capacitor 115 is electrically connected to an input interface of the PDM signal conversion chip 111, and an output interface of the PDM signal conversion chip 111 is an output end of the PDM converter 11.
Thus, the PDM converter 11 is a circuit composed of a PDM signal output chip (i.e., the PDM signal conversion chip 111), a resistance component (including the first resistor 112 and the second resistor 113) and a capacitance component (including the first capacitor 114 and the second capacitor 115), an input terminal of the PDM converter 11 receives the audio analog signal, and an output terminal of the PDM converter 11 outputs the PDM signal.
The PDM signal conversion chip 111 is a chip that converts an analog signal into a digital signal based on the PDM technology. Illustratively, the PDM signal conversion chip 111 may be any type of PDM-based analog-to-digital conversion chip known to those skilled in the art, and the embodiment of the present disclosure is not limited thereto.
It should be noted that the resistance value of the first resistor 112, the resistance value of the second resistor 113, the capacitance value of the first capacitor 114, and the capacitance value of the second capacitor 115 can be set according to the requirement of the voice wake-up test circuit, which is neither described nor limited in this embodiment of the disclosure.
In other embodiments, other circuit structures known to those skilled in the art may be adopted to implement the conversion from the audio analog signal to the PDM signal, which is not limited by the embodiments of the present disclosure.
In one embodiment, with continued reference to fig. 2, the power interface of the PDM signal conversion chip 111 is electrically connected to the MIC interface power terminal of the speech system 12.
Therefore, the MIC interface power supply end of the voice system 12 can supply power to the PDM signal conversion chip 111, a power supply source of the PDM signal conversion chip 111 does not need to be additionally arranged, the circuit structure is favorably simplified, the space occupied by the experiment bench where the voice awakening test circuit is located is reduced, and the cost of the voice awakening test circuit is favorably reduced.
In other embodiments, a power supply of the PDM signal conversion chip 111 may be additionally provided, which is not limited in the embodiment of the disclosure.
In one embodiment, with continued reference to fig. 2, the clock signal interface of the PDM signal conversion chip 111 is electrically connected to the MIC interface clock terminal of the speech system 12.
Therefore, the time of the PDM signal conversion chip 111 and the time of the voice system 12 can be unified, so that the voice system 12 is ensured to act in response to the current PDM signal, and the accuracy of the voice response test is ensured.
Meanwhile, the MIC interface clock end of the voice system 12 is used for providing a clock signal for the PDM signal conversion chip 111, so that the time synchronization module of the PDM signal conversion chip 111 and the voice system 12 does not need to be additionally arranged, the circuit structure is favorably simplified, the space occupied by an experiment bench where the voice awakening test circuit is located is reduced, and the cost of the voice awakening test circuit is favorably reduced.
In other embodiments, a time synchronization module of the PDM signal conversion chip 111 and the speech system 12 may also be additionally provided, which is not limited in the embodiment of the present disclosure.
In an embodiment, fig. 3 is a schematic structural diagram of a voice wake-up test circuit according to another embodiment of the present disclosure. On the basis of fig. 1, referring to fig. 3, the voice wake-up test circuit further includes a sound card 13 and an attenuator 14, and the attenuator 14 is connected in series between the sound card 13 and the pulse density modulation converter 11. Illustratively, an input terminal of the attenuator 14 is electrically connected to an output terminal of the sound card 13, and an output terminal of the attenuator 14 is electrically connected to an input terminal of the PDM converter 11.
Wherein, the attenuator 14 is configured to attenuate the amplitude of the received audio analog signal with the first amplitude output by the sound card 13 to a second amplitude, and output the audio analog signal to the PDM converter 11; the second amplitude and the first amplitude are amplitudes corresponding to the same audio frequency analog signal and have different sizes, and the second amplitude is smaller than the first amplitude.
The sound card 13 is different from the sound card in the prior art in that: the sound card in the prior art transmits an audio analog signal to a player, such as a loudspeaker, for playing, so as to make a sound; the sound card 13 in the embodiment of the present disclosure transmits the audio analog signal to the PDM converter, and the PDM converter converts the audio analog signal into a PDM signal and then performs a wake-up test on the voice system 12. Therefore, the whole wake-up test link does not make sound, and the voice wake-up test without audible sound can be realized.
The audio analog signal with the first amplitude and the audio analog signal with the second amplitude correspond to the same audio analog signal with the same frequency characteristic, and the difference is that the amplitudes of the two are different, the sound card 13 outputs the audio analog signal with the larger amplitude, and the attenuator 14 outputs the audio analog signal with the smaller amplitude. Generally, the amplitude of the audio analog signal output by the sound card 13 is large, whereas the PDM converter 11 requires the amplitude of the input audio analog signal to be small. Based on this, by setting the attenuator 14, output-to-input amplitude matching can be achieved, namely: the audio analog signal output by the sound card 13 is attenuated to the audio analog signal that can be received by the PDM converter 11 for signal conversion and voice wake-up test.
It can be understood that when the audio analog signal output by the sound card 13 can meet the receiving requirement of the PDM converter 11, the voice wake-up test circuit may also not be provided with the attenuator 14, i.e. the voice wake-up test circuit shown in fig. 1 or fig. 2.
Specifically, if the amplitude of the audio analog signal exceeds the range of amplitude that can be received by the PDM converter, the signal is easily distorted when the signal conversion is performed in the PDM converter 11, resulting in a lower accuracy of the voice wake-up test. Based on this, whether the attenuator 14 needs to be set depends on the amplitude range of the audio analog signal output by the sound card 13 and the input amplitude range requirement of the PDM converter 11; if the two amplitude ranges can be matched, an attenuator is not required to be arranged; if the two amplitude ranges do not match, then the attenuator 14 needs to be set.
It should be noted that the first amplitude depends on the amplitude of the audio analog signal output by the sound card 13, and the second amplitude depends on the amplitude of the audio analog signal that can be received by the PDM converter 11.
In an embodiment, fig. 4 is a schematic structural diagram of a voice wake-up test circuit according to another embodiment of the present disclosure. On the basis of fig. 3, with reference to fig. 4, the attenuator 14 comprises a resistive network with a preset attenuation ratio.
In this way, the audio analog signal output by the sound card 13 can be attenuated to the audio analog signal that can be received by the PDM converter 11, and the configuration of the attenuator 14 is simple.
It will be appreciated that the predetermined attenuation ratio is equal to the ratio of the second amplitude to the first amplitude.
In one embodiment, with continued reference to fig. 4, the resistor network with the predetermined attenuation ratio includes a third capacitor 141, a third resistor 142, and a fourth resistor 143; the third capacitor 141 and the third resistor 142 are connected in series between the input terminal and the output terminal of the attenuator 14, and the third resistor 142 is connected in series between the third capacitor 141 and the output terminal of the attenuator 14; the fourth resistor 143 is connected in series between the output of the attenuator 14 and ground.
Illustratively, the first end of the third capacitor 141 is an input end of the attenuator 14, the second end of the third capacitor 141 is electrically connected to the first end of the third resistor 142, the second end of the third resistor 142 and the first end of the fourth resistor 143 are both output ends of the attenuator 14, and the second end of the fourth resistor 143 is grounded.
Therefore, the attenuator 14 is a resistor network with a preset attenuation ratio, which is composed of resistor components (including the third resistor 142 and the fourth resistor 143) and capacitor components (including the third capacitor 141), and has a simple structure and low cost.
It should be noted that the resistance value of the third resistor 142, the resistance value of the fourth resistor 143, and the capacitance value of the third capacitor 141 can be set according to the requirement of the voice wake-up test circuit, which is neither described nor limited in the embodiment of the present disclosure.
In other embodiments, other circuit structures known to those skilled in the art may be adopted to implement the attenuation of the audio analog signal, which is not limited by the embodiments of the present disclosure.
In an embodiment, referring to any one of fig. 1 to 4, the voice wake-up test circuit further includes a sound source terminal 15, and an input terminal of the sound card 13 is connected to an output terminal of the sound source terminal 15; the input of the sound card 13 is for receiving the initial audio data output by the sound source terminal 15.
Here, the sound source terminal 15 stores therein original audio data (also referred to as "original audio data"), or audio data generated by recording the original audio data on the sound source terminal 15.
Illustratively, the sound source terminal 15 may be a Personal Computer (PC) terminal. The original audio data of the PC end is output as an audio analog signal through the sound card 13, the audio analog signal is attenuated by the attenuator 14 or directly transmitted to the PDM converter 11, and is converted into a PDM signal through the PDM converter 11, and the PDM signal is output to the MIC interface signal input end of the voice system 12, thereby implementing a voice wake-up test.
In one embodiment, the sound card 13 and the sound source terminal 15 are connected via a Universal Serial Bus (USB).
Namely, the original audio data of the sound source terminal 15 is transmitted to the sound card 13 through the USB interface, the transmission mode is simple, and the signal fidelity is high, which is beneficial to realizing the accurate test of voice wakeup.
In one embodiment, the sound source terminal 15 comprises a car audio bus.
Therefore, the voice wake-up test circuit can be a circuit of an A2B bus MIC of a voice automatic test, can automatically wake up a voice system without making a sound, and can test a plurality of experiment racks in a limited space to avoid mutual interference among the racks.
In other embodiments, the voice wake-up test circuit is not limited to the automatic test of the voice system of the smart car, and may also be used for the silent automatic test of other voice products, which is not limited in the embodiments of the present disclosure.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A voice wake-up test circuit, comprising: pulse density modulation converters and voice systems;
the input end of the pulse density modulation converter is used for receiving an audio analog signal, the output end of the pulse density modulation converter is connected with the microphone interface signal input end of the voice system, and the pulse density modulation converter is used for converting the audio analog signal into a pulse density modulation signal; and transmitting the pulse density modulation signal to the voice system to carry out awakening test of the voice system.
2. The voice wake-up test circuit according to claim 1, wherein the pulse density modulation converter comprises a pulse density modulation signal conversion chip, a first resistor, a second resistor, a first capacitor and a second capacitor;
the first resistor and the first capacitor are connected in series at an input interface end of the pulse density modulation signal conversion chip, and the first capacitor is connected in series between the first resistor and the pulse density modulation signal conversion chip; the second resistor and the second capacitor are connected in series between the input end of the pulse density modulation converter and the ground, and the second capacitor is connected in series between the second resistor and the ground.
3. The voice wake-up test circuit of claim 2, wherein the power interface of the pulse density modulated signal converting chip is electrically connected to a microphone interface power terminal of the voice system.
4. The voice wake-up test circuit according to claim 2, wherein the clock signal interface of the pulse density modulated signal conversion chip is electrically connected to a microphone interface clock terminal of the voice system.
5. The voice wake-up test circuit of claim 1, further comprising a sound card and an attenuator;
the attenuator is connected in series between the sound card and the pulse density modulation converter;
the attenuator is used for attenuating the amplitude of the received audio analog signal with the first amplitude output by the sound card to a second amplitude and outputting the audio analog signal to the pulse density modulation converter; the first amplitude and the second amplitude are amplitudes corresponding to the same audio frequency analog signal and have different sizes, and the second amplitude is smaller than the first amplitude.
6. The voice wake-up test circuit of claim 5, wherein the attenuator comprises a resistor network having a preset attenuation ratio.
7. The voice wake-up test circuit according to claim 6, wherein the resistor network with the predetermined attenuation ratio comprises a third capacitor, a third resistor and a fourth resistor;
the third capacitor and the third resistor are connected in series between the input end and the output end of the attenuator, and the third resistor is connected in series between the third capacitor and the output end of the attenuator; the fourth resistor is connected between the output end of the attenuator and the ground in series.
8. The voice wake-up test circuit according to claim 5, further comprising a sound source terminal, wherein an input terminal of the sound card is connected to an output terminal of the sound source terminal;
and the input end of the sound card is used for receiving initial audio data output by the sound source terminal.
9. The voice wake-up test circuit of claim 8, wherein the sound card is connected to the sound source terminal via a universal serial bus.
10. The voice wake-up test circuit of claim 8, wherein the sound source terminal comprises a car audio bus.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114245284A (en) * | 2021-12-10 | 2022-03-25 | 深圳市精泰达科技有限公司 | Microphone performance detection method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114245284A (en) * | 2021-12-10 | 2022-03-25 | 深圳市精泰达科技有限公司 | Microphone performance detection method and system |
| CN114245284B (en) * | 2021-12-10 | 2024-02-27 | 深圳市精泰达科技有限公司 | Microphone performance detection method and system |
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