Sujet : Voice compression
De : pozzugno (at) *nospam* gmail.com (pozz)
Groupes : comp.arch.embeddedDate : 02. Apr 2025, 17:33:56
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vsjotj$14v21$1@dont-email.me>
User-Agent : Mozilla Thunderbird
I need to manage some audio voice streams. They will be saved on a non volatile memory as raw arrays of unsigned char.
The main goal is to play these audio streams through a DAC/PWM. I'm not interested in high quality, a "mid/low" quality could be good.
My hardware is a poor AVR8 8-bits MCU.
I have a limited memory space, so I'm searching a good voice codec with compression. Lower the bitrate, more streams I can store. 16kbps can be good for my application. Maximum 24kbps.
By using 4-bits ADPCM I could have 32kpbs at 8kHz sampling rate. With 3-bits ADPCM I could read 24kbps.
I tried to reduce sampling frequency to 4kHz, but the quality is drastically reduced.
I know there are many others voice codecs that reduce the bitrate a lot, but the decoder seems too complex to implement on AVR8.
Any suggestions?
Voice compression
Re: Voice compression