CN113784269A - A2B digital microphone test system and test method - Google Patents
A2B digital microphone test system and test method Download PDFInfo
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- CN113784269A CN113784269A CN202110943301.8A CN202110943301A CN113784269A CN 113784269 A CN113784269 A CN 113784269A CN 202110943301 A CN202110943301 A CN 202110943301A CN 113784269 A CN113784269 A CN 113784269A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
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- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
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Abstract
The invention belongs to the technical field of microphone testing, and relates to an A2B digital microphone testing system and a testing method, wherein the system comprises the following steps: the system comprises an A2B bus, an A2B microphone mainboard, an audio line and an audio test system; the method comprises the following steps: s1, connecting the A2B digital microphone and the A2B microphone mainboard by an A2B bus to complete the conversion of audio signals; and S2, connecting the audio test system with the A2B microphone mainboard by using an audio line, transmitting the audio test system with the audio signal required by the audio test system, and completing the test of the A2B digital microphone. The method and the device solve the problem that the existing AP test system or B & K test system cannot directly test the A2B digital microphone due to different input of the audio signals.
Description
Technical Field
The invention belongs to the technical field of microphone testing, and relates to an A2B digital microphone testing system and a testing method.
Background
With the advent of A2B (Automotive Audio Bus) microphone, the conversion from an electret microphone to an analog silicon microphone and then to a digital silicon microphone is completed, and with the test problem about the A2B microphone, the A2B microphone is just a model of digital microphone, and the test for the digital microphone on the market, such as an AP or B & K test system, cannot directly test the A2B microphone due to different inputs of Audio signals.
Disclosure of Invention
To solve the problems in the prior art, the application provides that the main node A2B is used for completing the conversion of audio signals, so that the audio signals are connected with an AP or B & K system in a butt joint mode, the testing problem of the A2B microphone is solved, and the specific technical scheme is as follows:
an A2B digital microphone testing system, comprising: the system comprises an A2B bus, an A2B microphone mainboard, an audio line and an audio test system;
the A2B microphone main board is connected with an A2B digital microphone through an A2B bus, and the A2B microphone main board is connected with an audio test system through an audio line;
the A2B microphone main board is used for: completing the conversion of the audio signal;
the audio test system is configured to: the test for the A2B digital microphone was completed.
On the basis of the above technical solution, the audio test system includes: an AP (Audio Precision Audio analyzer) test system and a B & K (danish B & K electro-acoustic test system) test system.
On the basis of the technical scheme, the A2B bus carries out span transmission of audio data through a low-cost unshielded twisted pair UTP.
On the basis of the above technical solution, the A2B bus is: a vehicle-mounted high-bandwidth (up to 50Mbps) and bidirectional digital audio bus adopts a daisy chain structure, is a single Master (Master) -multi-Slave (Slave) system, and maximally supports 11 nodes (10 Slave nodes), wherein the distance between the nodes is maximally 15 meters, and the longest distance between the nodes is 40 meters in the whole daisy chain.
On the basis of the above technical solution, the A2B bus supports span digital audio transmission, supports at most 32 data channels (uplink and downlink), and has a conventional code rate: 48kHz-44.1kHz (supporting 96kHz, 192kHz high fidelity audio); a clock and power supply are embedded in the A2B bus.
On the basis of the technical scheme, the audio line is as follows: and a shielded wire.
On the basis of the above technical solution, the audio line includes: audio-frequency electric signal cable and audio-frequency optical signal cable.
On the basis of the above technical solution, the audio line includes: the audio cable comprises an audio cable body and plastic outer molds connected to two ends of the audio cable body, wherein contact pins are arranged at the front ends of the plastic outer molds, first magnets are arranged in the plastic outer molds, a plurality of spherical bodies are arranged on the audio cable body in a row at equal intervals, a second magnet is arranged in each spherical body, and an elastomer outer protective layer is arranged on the periphery of the audio cable body.
A method for testing an A2B digital microphone by using the A2B digital microphone testing system comprises the following steps:
s1, connecting the A2B digital microphone and the A2B microphone mainboard by an A2B bus to complete the conversion of audio signals;
and S2, connecting the audio test system with the A2B microphone mainboard by using an audio line, transmitting the audio test system with the audio signal required by the audio test system, and completing the test of the A2B digital microphone.
The invention has the following beneficial technical effects:
the method solves the problem that the existing AP test system or B & K test system can not directly test the A2B digital microphone due to different input of the audio signals
Drawings
The invention has the following drawings:
fig. 1 is a block diagram illustrating a structure of an A2B digital microphone testing system according to the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
As shown in fig. 1, the A2B bus is used to connect the A2B digital microphone and the A2B microphone main board, so as to complete the conversion of the audio signal; and then, connecting the AP test system or the B & K test system with the A2B microphone mainboard by using an audio line, so as to transmit audio signals required by the AP test system or the B & K test system, and completing the test of the A2B digital microphone.
On the basis of the technical scheme, the A2B bus carries out span transmission of audio data through a low-cost unshielded twisted pair UTP.
On the basis of the above technical solution, the A2B bus is: a vehicle-mounted high-bandwidth (up to 50Mbps) and bidirectional digital audio bus adopts a daisy chain structure, is a single Master (Master) -multi-Slave (Slave) system, and maximally supports 11 nodes (10 Slave nodes), wherein the distance between the nodes is maximally 15 meters, and the longest distance between the nodes is 40 meters in the whole daisy chain.
On the basis of the above technical solution, the A2B bus supports span digital audio transmission, supports at most 32 data channels (uplink and downlink), and has a conventional code rate: 48kHz-44.1kHz (supporting 96kHz, 192kHz high fidelity audio); a clock and power supply are embedded in the A2B bus.
On the basis of the technical scheme, the audio line is as follows: and a shielded wire.
On the basis of the above technical solution, the audio line includes: audio-frequency electric signal cable and audio-frequency optical signal cable.
On the basis of the above technical solution, the audio line includes: the audio cable comprises an audio cable body and plastic outer molds connected to two ends of the audio cable body, wherein contact pins are arranged at the front ends of the plastic outer molds, first magnets are arranged in the plastic outer molds, a plurality of spherical bodies are arranged on the audio cable body in a row at equal intervals, a second magnet is arranged in each spherical body, and an elastomer outer protective layer is arranged on the periphery of the audio cable body.
It is to be understood that the foregoing description of the embodiments of the present invention is provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims.
Those not described in detail in this specification are within the knowledge of those skilled in the art.
Claims (9)
1. An A2B digital microphone testing system, comprising: the system comprises an A2B bus, an A2B microphone mainboard, an audio line and an audio test system;
the A2B microphone main board is connected with an A2B digital microphone through an A2B bus, and the A2B microphone main board is connected with an audio test system through an audio line;
the A2B microphone main board is used for: completing the conversion of the audio signal;
the audio test system is configured to: the test for the A2B digital microphone was completed.
2. The A2B digital microphone testing system of claim 1, wherein: the audio test system comprises: an AP test system and a B & K test system.
3. The A2B digital microphone testing system of claim 1, wherein: the A2B bus transmits audio data over the span via an unshielded twisted pair UTP.
4. The A2B digital microphone testing system of claim 1, wherein: the A2B bus is: a vehicle-mounted high-bandwidth and bidirectional digital audio bus adopts a daisy chain structure, is a single-host-multi-slave system, supports 11 nodes, has the longest distance between the nodes of 15 meters, and has the longest whole daisy chain of 40 meters.
5. The A2B digital microphone testing system of claim 1, wherein: the A2B bus supports span digital audio transmission, supports 32 data channels, and has a conventional code rate: 48kHz-44.1 kHz; a clock and power supply are embedded in the A2B bus.
6. The A2B digital microphone testing system of claim 1, wherein: the audio line is: and a shielded wire.
7. The A2B digital microphone testing system of claim 6, wherein: the audio line includes: audio-frequency electric signal cable and audio-frequency optical signal cable.
8. The A2B digital microphone testing system of claim 1, wherein: the audio line includes: the audio cable comprises an audio cable body and plastic outer molds connected to two ends of the audio cable body, wherein contact pins are arranged at the front ends of the plastic outer molds, first magnets are arranged in the plastic outer molds, a plurality of spherical bodies are arranged on the audio cable body in a row at equal intervals, a second magnet is arranged in each spherical body, and an elastomer outer protective layer is arranged on the periphery of the audio cable body.
9. A method for performing A2B digital microphone test using the A2B digital microphone testing system of any one of claims 1-8, comprising the steps of:
s1, connecting the A2B digital microphone and the A2B microphone mainboard by an A2B bus to complete the conversion of audio signals;
and S2, connecting the audio test system with the A2B microphone mainboard by using an audio line, transmitting the audio test system with the audio signal required by the audio test system, and completing the test of the A2B digital microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110943301.8A CN113784269A (en) | 2021-08-17 | 2021-08-17 | A2B digital microphone test system and test method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110943301.8A CN113784269A (en) | 2021-08-17 | 2021-08-17 | A2B digital microphone test system and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115550101A (en) * | 2022-09-20 | 2022-12-30 | 中国第一汽车股份有限公司 | Automobile audio bus test system |
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2021
- 2021-08-17 CN CN202110943301.8A patent/CN113784269A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115550101A (en) * | 2022-09-20 | 2022-12-30 | 中国第一汽车股份有限公司 | Automobile audio bus test system |
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