When making a call using a microphone and a speaker, such as in video conferencing systems and in-vehicle hands-free calling systems, the sound (echo) from the speaker to the microphone interferes with the call, and this echo needs to be eliminated.
In addition, since ambient noise is often input to the microphone in such systems, noise reduction processing is also required.
TMC has developed and commercialized a software IP that reduces echoes and noise to enable calls with high speech intelligibility. It is also useful as pre-processing for speech recognition during music playback.
|Data Sampling Frequency||8k Hz, 16k Hz, 24k Hz, 32k Hz, 48k Hz|
|Input/Output Data Format||16-bit linear PCM (monaural)|
|echo elimination||Approx. 60 dB (max.)|
|Erasable echo length||Up to 128m sec (customizable)|
|Strength of background noise reduction||9 levels of adjustment|