| 摘要(英) |
The primary purpose of this research is to reduce the audio Latency. The headset development board and the Bluetooth receiver (dongle) development board of the same Bluetooth chip manufacturer are used to implement a path that shortens the transmission time, the audio data is sent in the shortest path according to a specific ACL (Asynchronous Connectionless Link) format is transmitted to the Bluetooth low layer and sent out. In the interference environment, the faster the transmission, the more packet loss distortion will be generated. Therefore, a retransmission mechanism is used to process and experimentally analyze the relationship between the distortion caused by signal interference and the latency caused by retransmission in this transmission path.
The experiment will be divided into two parts: objective assessment and subjective evaluation under interference environment. The objective assessment experiment uses APx525b acoustic measuring instrument to measure THD+N (Total Harmonic Distortion + Noise), SNR (Signal-to-noise ratio), which are used to quantify signal performance. Measure indicators to evaluate the linear relationship between distortion and delay caused by signal interference. And then observe the output audio waveform through the recording tool “CoolEdit” and capture its distortion ratio as a reference basis for distortion and latency.
In the subjective assessment experiment, the subject is asked the testers watching and listening to the MV of the audio-visual platform in an interference environment with subtitles/captions to evaluate the feeling of latency and distortion. The result is supplemented by objective experimental data to find out the best retransmission value setting in this interference environment. This value is the best choice for the anti-interference and low latency under this method. |
| 參考文獻 |
[1] ITU-R Recommendation, General methods for the subjective assessment of sound quality, International Telecommunication Union, BS.1284-1, Geneva, 2003.
[2] Hangil Moon, N. Lee, H. Kim and S. Lee, "Low latency audio coder design for bluetooth and bluetooth low energy," 2015 IEEE International Conference on Consumer Electronics (ICCE), 2015, pp. 138-141, doi: 10.1109/ICCE.2015.7066354.
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[6] Bluetooth SIG, “HFP1.5_SPEC”, 2005-11-25 Adopted V10r00
[7] Bluetooth SIG, “HSP_SPEC”, 2008-12-18 V12r00
[8] Bluetooth SIG, ”Bluetooth Core Specification V5.3”, Revision Date: 2021-07-13
[9] Andrew Holmes, “A comparison of SCO and ACL packets for audio transmission in Bluetooth”, Semantic Scholar, Published 2002.
[10] Kester, Walt (2009), Understand SINAD, ENOB, SNR, THD, THD + N, and SFDR so You Don′t Get Lost in the Noise Floor, Tutorial, Analog Devices, MT-003
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[12] THD+N
Rane audio′s definition of both THD and THD+N. [2012-03-03].
https://en.wikipedia.org/wiki/Total_harmonic_distortion [Last accessed: 2 Jan 2022]
[13] SNR
https://en.wikipedia.org/wiki/Signal-to-noise_ratio [Last accessed: 2 Jan 2022]
[14] Adele [easy on me] https://www.youtube.com/watch?v=xXyV5qVfnFU[Last accessed: 2 Jan 2022]
[15] G.E.M.[光年之外 LIGHT YEARS AWAY ]MV https://www.youtube.com/watch?v=T4SimnaiktU[Last accessed: 2 Jan 2022]
[16] 老王樂隊 [安九 Enjoy] https://www.youtube.com/watch?v=4bSeT_9gmJs[Last accessed: 2 Jan 2022]
[17] 告五人 Accusefive [ 在這座城市遺失了你 Where I Lost Us ] https://www.youtube.com/watch?v=PlCbgZxonJs[Last accessed: 2 Jan 2022]
[18] 原子邦妮 Astro Bunny [離開後別對我好]
https://www.youtube.com/watch?v=4XCK91R4Euk[Last accessed: 2 Jan 2022] |
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