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Audio over Bluetooth: most detailed information about ...
https://habr.com/en/post/456182/
CVSD The basic speech transfer codec CVSD was standardized in 2002, and is supported by all bidirectional Bluetooth devices. It provides audio transmission with a sampling frequency of 8 kHz, which corresponds to the quality of conventional wired telephony. An example of recording in this codec. mSBC
Developing Bluetooth Audio Devices - Silicon Labs
https://www.silabs.com/documents/login/presentations/Developing-Bluetooth-Audio.pdf
• Audio transmitted over a synchronous SCO channel and a separate data channel used for controlling the audio stream (AT commands) • Features – Mono audio – Sampling rates from 8 to 16kHz – Typical audio delay 20-30ms – Uses CVSD (8kHz) and alternative mSBC (16 kHz) (in HFP v.1.6) audio codecs
QCA9377 3 Bluetooth and WLAN - Qualcomm
https://developer.qualcomm.com/qfile/35615/80-yc636-2_d_qca9377-3_bt_wlan_release_notes.pdf
CVSD audio coding over SCO mSBC audio coding over eSCO A2DP/AVDTP Source 1.2 Sink 1.2 HID over GATT Profile . 1.0 . SPP Over BR/EDR 1.2 BLE Concurrent Central/Peripheral . Bluetooth 4.1 . BLE Secure Connection . Bluetooth 4.2 . QCA9377-3 Bluetooth and WLAN Release Notes .
AN214937 - Bluetooth Audio Over I2S - Cypress
https://www.cypress.com/file/298666/download
Air_Coding_Format= 0x0 (0, “CVSD”) Write_SCO_PCM_Int_Param SCO_Routing: PCM [1C FC 05]: 00 02 00 01 01 opcode= 0xFC1C (64540, “Write_SCO_PCM_Int_Param”) SCO_Routing a= a.See SCO_Routing for details. 0x0 (0, “PCM”) PCM_Interface_Rate = 0x2 (2, “512 KBps”) Frame_Type= 0x0 (0, “Short”) Sync_Mode= 0x1 (1, “Master”)
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