The Echo and noise elimination speech recognition module adopts double wheat design, double wheat means double microphones, install two microphones, again through technical processing, the external noise elimination, so that the receiver voice is very clean, the design is also comes from the sound wave superposition principle of set-off, due to the vibration of transmission is through the medium of sound, between wave and wave waveform, if the opposite phase offset condition in theory.
It supports echo cancellation of reference signal analog input, digital I2S input, analog output or digital I2S output after processing signal, and the sampling rate can be configured according to different audio frequencies. Echo cancellation is a kind of technology to remove echo, using echo cancellation method, that is, by adaptive method to estimate the size of the echo signal, and then subtract this estimate in the received signal to cancel the echo.
The module size of double wheat noise reduction and echo elimination scheme is only 28.1×33.8×3mm. In the face of complex range hood, it only needs to connect two cables in the SCM to connect the module, and it is not necessary to connect the lights 1 and 2.... in the SCM Or motor 1, motor 2... Perform complex debugging operations.
It also supports low power management, which is a great help for home appliances to save energy.
