Microchip Technology Audio Digital-to-Analog Converter Manual de usuario descargar pdf (Pagina 42)

Audio Software Support

Noise

Suppression

Acoustic Echo

Cancellation

Line Echo

Cancellation

Speech

Recognition

WAVEFORM

CODERS

VOCODERS

G.711 G.726A

SPEEX

SOLUTIONS

SPEECH CODING SPEECH PROCESSING

HARDWARE

Audio PICtail Plus

The Speech coding libraries can be classified into waveform coders and vocoders.

Waveform coders exploit the redundancies in the signal waveform to decrease the number

of bits used to represent a speech frame. G.711 and G.726A are examples of waveform

coders. Vocoders encode a speech frame as a set of parameters. These parameters are

then used by the decoder to re-generate the corresponding speech signal. The SPEEX

algorithm is an example of a vocoder. Typically vocoders are capable of better compression

than waveform coders, but they require more computational resources. Any of the Speech

Coding libraries can be used with the DAC module.

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Microchip Technology Audio Digital-to-Analog Converter Manual de usuario Pagina 42