LC3 codec with 24-bit PCM

RE: LC3 codec with 24-bit PCM

Amanda Hsieh — Mon, 14 Nov 2022 18:48:23 GMT

Good to hear that. 🙂

-Amanda

RE: LC3 codec with 24-bit PCM

kieran.cheung — Mon, 14 Nov 2022 15:12:14 GMT

Hi Amanda, thanks for the answer. After some experimentation I found I was having an endianness issue when attempting reformat the data from my microphones for the codec.

Converting the PCM buffers to and from the codec-buffer and my larger-type buffer for the I2S driver using little endian seems to be giving the expected output now.

RE: LC3 codec with 24-bit PCM

Amanda Hsieh — Fri, 11 Nov 2022 15:21:58 GMT

Hi,

There is a parameter to set bitDepth. Not sure if you are using the LC3 directly or if you are going through our application, because we removed support for 24 bit I2S since we are having issues with the clock divisions. In any case our application is set to default use 16 bit. Also note that the T2 implementation of LC3 only use 16 bit to encode, meaning you mask out all the upper bits if given 24 or 32 bits. It does support 24 bit, but the information is lost.

Regards,
Amanda H.

RE: LC3 codec with 24-bit PCM

Amanda Hsieh — Thu, 10 Nov 2022 17:42:32 GMT

Hi,

Let me check with the team and update the case later.

Regards,
Amanda H.