CN111313984B - Testing device and method for various audio codes of Bluetooth headset - Google Patents
Testing device and method for various audio codes of Bluetooth headset Download PDFInfo
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- CN111313984B CN111313984B CN202010101943.9A CN202010101943A CN111313984B CN 111313984 B CN111313984 B CN 111313984B CN 202010101943 A CN202010101943 A CN 202010101943A CN 111313984 B CN111313984 B CN 111313984B
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Abstract
The invention relates to the technical field of Bluetooth testing, in particular to a testing device and a testing method for various audio codes of a Bluetooth headset. The test device comprises: a USB distributor; the android software and hardware system comprises a CPU and an android software platform and is used for encoding audio signals and sending the encoded audio signals to the switching chip in a PCM audio format; a high resolution sound card; the switching chip is used for butting a Bluetooth radio frequency chip and a Bluetooth LE radio frequency chip and selecting one of the Bluetooth radio frequency chip and the Bluetooth LE radio frequency chip to carry out audio signal transmission; a Bluetooth radio frequency chip supporting A2DP and HFP; and the Bluetooth LE radio frequency chip supports LC3 codes and is used for synchronously connecting a plurality of Bluetooth earphones to be tested and simultaneously carrying out audio streaming test. The testing device and the method support all coding formats and all transmission protocol tests, and one piece of equipment can replace various pieces of equipment in the prior art, so that the testing efficiency of all coding formats of the Bluetooth headset is greatly improved.
Description
Technical Field
The invention relates to the technical field of Bluetooth testing, in particular to a device and a method for testing various audio codes of a Bluetooth headset.
Background
Bluetooth is a substitute term of wireless audio, and thoroughly changes the way that people communicate through multimedia. Bluetooth enables earphones, speakers and entertainment equipment to get rid of the wired constraint, so that consumers can have music and entertainment experience without data lines. Statistically, consumer demand for bluetooth headsets continues to increase in all headsets currently on the market, 50% of which contain bluetooth functionality.
The bluetooth headset needs to be tested in the production and design processes, and currently, audio source devices and the bluetooth headset gradually support more coding formats, so that the testing for various transmission protocols and coding formats is particularly necessary. Currently, compatibility tests of various formats for bluetooth headsets are independent, as shown in fig. 1.
Whether the common earphone or the TWS earphone is tested based on the SBC coding, because the SBC coding efficiency is relatively low. The SBC is a mandatory and default codec for sub-band encoding, all stereo bluetooth headsets with advanced audio distribution profiles (A2 DP). Its bit rate is up to 328kbps and the sampling rate is 44.1 Khz. It provides general audio quality without requiring a large amount of processing power to encode or decode. But the audio quality will degrade and the high quality audio music sand noise and the recorded audio analysis will have a bad breath, especially when using a cheap bluetooth transmitter.
AAC is advanced audio coding, similar to SBC but with better sound quality, and this codec is widely used mainly by Apple's iTunes platform and some other non-wireless applications. aptX is a proprietary and optional codec designed for CSR. It is well suited for demanding audio applications because it can encode audio more efficiently and at a rate slightly higher than SBC. There are two additional variants, aptX (LL) and aptX HD, that can significantly reduce the delay of the connection or significantly improve its audio quality. However, it is limited in that the bluetooth transmitter and receiver must have aptX or compatible codecs to enable the codec to operate. LDAC is the wireless audio coding technology mainly proposed by Sony, the transmission rate can reach up to 990kbps, is more than three times higher than that of SBC coding, and can be said to be the closest lossless coding mode in the current wireless transmission. HWA is HWA (hi res Wireless audio) high-quality bluetooth protocol proposed by wach, which is also the third bluetooth high-quality protocol in the industry following aptX HD, LDAC. The HWA is based on an encoding protocol named LHDC, and provides three code rate modes, namely 400kbps, 500kbps/560kbps and 900kbps, so that the encoding efficiency of the SBC is completely improved.
The bluetooth alliance has released a new generation of bluetooth standards: LE-audio, the main characteristics are: low power consumption and high performance. In particular, its support for "multiple audio streaming technology" will have a disruptive effect on TWS (true wireless) headsets. Wherein the encoding format LC3 is the latest Bluetooth standard, and the Bluetooth organization adopting LE Audio will use a brand new high-quality low-power Audio codec LC 3. The feature of LC3 to provide high sound quality even at low data rates provides developers with great flexibility to better trade off key product attributes such as sound quality and power consumption when designing the product. However, the conventional bluetooth test equipment cannot perform multi-coding format test capability, and simultaneously lacks support for LC3 coding.
There is a bluetooth headset testing system (chinese patent publication No. CN109413557A) using an android phone as a bluetooth adapter, but it is also unable to test all the compatible coding formats, and the testing system relies on an additional phone.
Currently, Bluetooth headset test instruments are SBC, aptX or AAC single test instruments. At present, none of the devices can be compatible to carry out all coding format tests. The existing testing equipment and method have low efficiency and high cost when testing all the coding formats.
Disclosure of Invention
The invention discloses a device and a method for testing various audio codes of a Bluetooth headset, and aims to solve the technical problems in the prior art.
The invention adopts the following technical scheme:
a testing device for multiple audio codes of a Bluetooth headset comprises:
one end of the USB distributor is in signal connection with the upper computer through a USB, and the other end of the USB distributor is selectively connected with an android software and hardware system or a high-resolution sound card;
the android software and hardware system comprises a CPU and an android software platform and is used for encoding audio signals and sending the encoded audio signals to the switching chip in a PCM audio format; the android software and hardware system is in signal connection with the USB distributor, the high-resolution sound card and the switching chip respectively;
the high-resolution sound card is in signal connection with the android software and hardware system by adopting an I2S signal;
the switching chip is used for butting the Bluetooth radio frequency chip and the Bluetooth LE radio frequency chip and selecting one of the Bluetooth radio frequency chip and the Bluetooth LE radio frequency chip to transmit audio signals under the control of an android software and hardware system;
the Bluetooth radio frequency chip supports A2DP and HFP and is used for transmitting and receiving the multi-coding format of the Bluetooth headset to be tested;
and the Bluetooth LE radio frequency chip supports LC3 codes and is used for synchronously connecting a plurality of Bluetooth earphones to be tested and simultaneously carrying out audio streaming test.
As a further preferred technical solution, the multiple encoding format includes: one or more of SBC encoding, APT-X (LL) encoding, APT-X HD encoding, AAC encoding, LDAC encoding, and HWA encoding.
As a further preferred technical solution, the bluetooth LE rf chip is a multiple streaming audio function chip of LC3 supporting bluetooth low energy.
As a further preferred technical solution, the encoded PCM audio is sent to the bluetooth source end in an original format without conversion.
As a further preferred technical solution, the USB distributor includes a USB slave device chip.
As a further preferred technical scheme, the android software and hardware system comprises a control chip, and a CPU chip of the mobile phone based on the USB transfer control type is used for controlling the android system to perform setting and code running.
As a further preferable technical scheme, the audio signal adopts a high-speed 32-bit 96KHz sampled I2S signal to be butted with an android system of a mobile phone CPU chip, and lossless audio is transmitted.
As a further preferred technical scheme, the android software and hardware system controls the high-resolution sound card.
As a further preferred technical solution, the USB distributor is a USB HUB device.
The invention also relates to a method for testing various audio codes of the Bluetooth headset, which utilizes the testing device for testing various audio codes of the Bluetooth headset to test and comprises the following steps:
firstly, connecting the testing device to an upper computer through a USB;
secondly, the upper computer controls the testing device to be connected with the Bluetooth headset to be tested in a Bluetooth mode; controlling the android software and hardware system to select one or more of SBC code, APT-X (LL) code, APT-X HD code, AAC code, LDAC code, HWA code and LC3 code according to the Bluetooth headset to be tested and then outputting the selected codes to a switching chip;
thirdly, the android software and hardware system controls the switching chip and selects one of the Bluetooth radio frequency chip and the Bluetooth LE radio frequency chip to transmit audio signals; when a Bluetooth radio frequency chip is selected, carrying out multi-coding format transmitting and receiving tests of the Bluetooth headset; when the Bluetooth LE radio frequency chip is selected, single audio source equipment and single or multiple Bluetooth earphones are synchronously connected with the multiple Bluetooth earphones for audio streaming test at the same time.
As a further preferable embodiment, the method further includes: and fourthly, carrying out a transmission test of the selected audio coding format when high-quality audio is used.
The technical scheme adopted by the invention can achieve the following beneficial effects:
1. the testing device for various audio codes of the Bluetooth headset can perform function testing on all the current Bluetooth headsets, supports all the coding formats and all the transmission protocol tests, and uses one piece of equipment to replace various pieces of equipment in the prior art, so that the testing efficiency aiming at all the coding formats is greatly improved, and compared with the total cost of various traditional testing equipment, the testing device has relatively low cost and wide market prospect. 2. The testing device for various audio codes of the Bluetooth headset does not need to use a mobile phone, and can realize standardization. 3. The testing device can be applied to the online detection of factory assembly lines, and can complete various Bluetooth tests only by arranging one testing device for each assembly line as an important link of factory automation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof illustrate the present invention and do not constitute a limitation of the present invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art Bluetooth headset testing device;
fig. 2 is a schematic diagram of a testing apparatus for multiple audio codes of a bluetooth headset according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the current situation that the test cannot be carried out completely, the embodiment provides the test of various audio coding formats of the Bluetooth headset. The embodiment generally adopts: and fusing a plurality of software and hardware systems. The basic scheme employs USB connection and control front-end, and format protocol changes. And a software hardware platform with more than 10.0 versions of android is adopted for audio coding, a PCM audio original non-conversion format is adopted for sending a Bluetooth emission source end after coding, and a multi-protocol Bluetooth emission source end emission chip, a high-pass Bluetooth radio frequency chip and a TI Bluetooth radio frequency chip are adopted for the source end.
According to fig. 1, the present embodiment provides a testing apparatus 10 for multiple audio codes of a bluetooth headset, comprising: one end of the USB distributor 11 is in signal connection with an upper computer through a USB, and the other end of the USB distributor is selectively connected with an android software and hardware system 13 or a high-resolution sound card 12; the android software and hardware system 13 comprises a control chip and an android software platform, and is used for encoding an audio signal, and sending the encoded audio signal to the switching chip 14 by adopting a PCM audio format; the android software and hardware system 13 is respectively in signal connection with the USB distributor 11, the high-resolution sound card 12 and the switching chip 14;
the high-resolution sound card 12 is in signal connection with the android software and hardware system 13 by adopting an I2S signal; the control chip of the android software and hardware system 13 can be selected from a mobile phone CPU. The high resolution sound card 12 is preferably a USB sound card.
And switching the chip 14, butting the Bluetooth radio frequency chip 15 and the Bluetooth LE radio frequency chip 16, and selecting one of the Bluetooth radio frequency chip 15 and the Bluetooth LE radio frequency chip 16 to transmit audio signals under the control of the android software and hardware system 13.
The bluetooth radio frequency chip 15, which is a conventional bluetooth radio frequency chip, supports A2DP and HFP, and is used for transmitting and receiving multiple encoding formats of a bluetooth headset to be tested; the bluetooth LE radio frequency chip 16 supports LC3 encoding, and is used for synchronously connecting a plurality of bluetooth headsets to be tested and simultaneously performing audio streaming test.
The multiple encoding formats include: one or more of SBC encoding, APT-X (LL) encoding, APT-X HD encoding, AAC encoding, LDAC encoding, and HWA encoding.
The Bluetooth LE radio frequency chip is a multi-streaming audio function chip of LC3 supporting Bluetooth low energy, and realizes simultaneous audio streaming test by synchronously connecting a plurality of devices among a single audio source device (source device) such as a smart phone and a single or a plurality of audio receiving devices (sink device). The selective audio coding format transmission test is performed when high quality audio is used.
And after coding, sending the coded audio to a Bluetooth transmitting source end by adopting a PCM audio original non-conversion format.
The USB distributor 11 comprises a USB slave device chip, and a USB collection sound card and a control card device are inserted into a computer and used for collection, analysis and control of an upper computer. The USB slave device chip is distributed to the sound card chip and the android software and hardware system 13 control chip by a distributor. The control chip is distributed to the android software and hardware system 13, and the USB slave device chip is used for controlling the USB control device (serial port) and sending an instruction to the android system.
Preferably, the captured audio is captured and played through a sound card.
Preferably, the USB distributor 11 is a USB HUB device.
The android software and hardware system 13 comprises a control chip, and a CPU chip of the mobile phone based on USB switching control, and is used for controlling the android system to set and code to run.
The audio signal adopts a high-speed 32-bit 96KHz sampled I2S signal to be butted with an android system of a mobile phone CPU chip, and lossless audio is transmitted.
The android software and hardware system 13 controls the high resolution sound card 12.
The embodiment also provides a method for testing multiple audio codes of a bluetooth headset, which uses the device 10 for testing multiple audio codes of a bluetooth headset to perform testing, and comprises the following steps:
firstly, connecting the testing device 10 to an upper computer through a USB;
and secondly, the USB is in butt joint with an upper computer, the upper computer needs to acquire audio signals and also needs to control the android system to select various formats. The upper computer controls the test device 10 to be connected with a Bluetooth headset to be tested in a Bluetooth mode; controlling the android software and hardware system 13 to select one or more of SBC code, APT-X (LL) code, APT-X HD code, AAC code, LDAC code, HWA code and LC3 code according to the Bluetooth headset to be tested and then outputting the selected codes to a switching chip;
thirdly, the android software and hardware system 13 controls the switching chip 14, and selects one of the Bluetooth radio frequency chip 15 and the Bluetooth LE radio frequency chip 16 to transmit audio signals; when the Bluetooth radio frequency chip 15 is selected, carrying out multi-coding format transmitting and receiving tests of the Bluetooth headset; when the Bluetooth LE radio frequency chip 16 is selected, a single audio source device and one or more Bluetooth earphones are synchronously connected with each other to simultaneously perform audio streaming test.
When the bluetooth LE radio frequency chip 16 is selected, a plurality of bluetooth headsets can be tested simultaneously. When the bluetooth radio chip 15 is selected (i.e., the conventional A2DP and HFP), a separate selection test is required.
Fourth, optionally, a selective audio coding format transmission test is performed when high quality audio is used.
The testing method can test the functions of all the current Bluetooth earphones, supports all the coding formats and all the transmission protocol tests, and uses one device to replace various devices in the prior art, so that the testing efficiency for all the coding formats is greatly improved. In addition, for a new encoding format which may appear in the future, the method provided by the embodiment still maintains the possibility of support, in other words, after the testing device of the embodiment is adaptively modified, the device and the method of the present invention still can provide support for the new encoding format or protocol.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A testing device for multiple audio codes of a Bluetooth headset is characterized by comprising:
one end of the USB distributor is in signal connection with the upper computer through a USB, and the other end of the USB distributor is selectively connected with an android software and hardware system or a high-resolution sound card;
the android software and hardware system comprises a CPU and an android software platform and is used for encoding audio signals and sending the encoded audio signals to the switching chip in a PCM audio format; the android software and hardware system is in signal connection with the USB distributor, the high-resolution sound card and the switching chip respectively;
the high-resolution sound card is in signal connection with the android software and hardware system by adopting an I2S signal;
the switching chip is used for butting the Bluetooth radio frequency chip and the Bluetooth LE radio frequency chip and selecting one of the Bluetooth radio frequency chip and the Bluetooth LE radio frequency chip to transmit audio signals under the control of an android software and hardware system;
the Bluetooth radio frequency chip supports A2DP and HFP and is used for transmitting and receiving the multi-coding format of the Bluetooth headset to be tested;
the Bluetooth LE radio frequency chip is a multi-streaming audio frequency function chip of LC3 supporting Bluetooth low energy, and is used for synchronously connecting a plurality of Bluetooth headsets to be tested and simultaneously carrying out audio streaming test.
2. The test device of claim 1, wherein the multiple encoding formats comprise: one or more of SBC encoding, APT-X (LL) encoding, APT-X HD encoding, AAC encoding, LDAC encoding, and HWA encoding.
3. The test device of claim 1, wherein the encoded PCM audio is transmitted to the Bluetooth transmitter site in a raw, unconverted format.
4. The testing device of claim 1, wherein the android software and hardware system comprises a control chip, and a CPU chip of the mobile phone based on the USB switching control type is used for controlling the android system to set and run codes.
5. The testing device of claim 4, wherein the audio signal is in butt joint with an android system of a mobile phone CPU chip by adopting a high-speed 32-bit 96KHz sampled I2S signal, and lossless audio is transmitted.
6. The testing device of claim 5, wherein the android software and hardware system controls the high resolution sound card.
7. The test apparatus of claim 1, wherein the USB dispenser is a USB HUB device.
8. A method for testing multiple audio codes of a bluetooth headset by using the testing device of any one of claims 1-7, comprising the following steps:
firstly, connecting the testing device to an upper computer through a USB;
secondly, the upper computer controls the testing device to be connected with the Bluetooth headset to be tested in a Bluetooth mode; controlling the android software and hardware system to select one or more of SBC code, APT-X (LL) code, APT-X HD code, AAC code, LDAC code, HWA code and LC3 code according to the Bluetooth headset to be tested and then outputting the selected codes to a switching chip;
thirdly, the android software and hardware system controls the switching chip and selects one of the Bluetooth radio frequency chip and the Bluetooth LE radio frequency chip to transmit audio signals; when a Bluetooth radio frequency chip is selected, carrying out multi-coding format transmitting and receiving tests of the Bluetooth headset; when the Bluetooth LE radio frequency chip is selected, single audio source equipment and single or multiple Bluetooth earphones are synchronously connected with the multiple Bluetooth earphones for audio streaming test at the same time.
9. The method as claimed in claim 8, further comprising: and fourthly, carrying out a transmission test of the selected audio coding format when high-quality audio is used.
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| CN112822623B (en) * | 2020-12-31 | 2022-11-18 | 佳禾智能科技股份有限公司 | Wireless earphone abnormity detection method and structure |
| CN113179477B (en) * | 2021-06-30 | 2021-09-07 | 杭州兆华电子有限公司 | LHDC earphone testing method and system |
| CN115499040B (en) * | 2022-09-09 | 2024-05-07 | 安克创新科技股份有限公司 | Bluetooth adapter and connection method thereof |
| WO2024087001A1 (en) * | 2022-10-25 | 2024-05-02 | 哲库科技(上海)有限公司 | Bluetooth encoding method and apparatus, bluetooth decoding method and apparatus, and device and medium |
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