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Speex encoding for voice data on STM32F407

Question asked by nguyen.nhan.002 on Mar 6, 2014
Latest reply on Mar 6, 2014 by fm
Hi, I use speex encoding with Stm32f407VG microcontrollers follows application note "Vocoder demonstration using a Speex audio codec on STM32F101xx and STM32F103xx microcontrollers" but differrent: I use an codec IC to ADC and DAC. I take library on sample code for stm32f103xx into stm32f407's project. I use functions: speex_encode_int, speex_bits_write, speex_bits_read_from, speex_decode_int to test encode and decode function. ADC and DAC is 8khz on Codec. Then the equal is, - The quality is very bad, I cannot hear human voice. I would like to ask the quality of Speex encoding on Stm32? Is it really good or have someting wrong with mine? - Are there any compression voice library on stm32f407. My voice stream is 64kbp and I need to compress as small as it can. Thanks you so much.,