IS2064 datasheet(15/74 Pages) MICROCHIP

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 2016 Microchip Technology Inc.

Advance Information

DS60001409A - Page 15

IS2062/64

2.0

AUDIO

The input and output audios have different stages and

each stage can be programmed to vary the gain

response characteristics. For microphone, both

single-end inputs and differential inputs are supported.

To maintain a high quality signal, a stable bias voltage

source to the condenser microphone’s FET is provided.

The DC blocking capacitors can be used at both

positive and negative sides of the input. Internally, this

analog signal is converted to 16-bit, 8/16 kHz linear

PCM data.

2.1

Digital Signal Processor

A Digital Signal Processor (DSP) is used to perform

speech and audio processing. The advanced speech

features, such as acoustic echo cancellation and noise

reduction are in-built. To reduce nonlinear distortion

and help echo cancellation, an outgoing signal level to

the speaker will exceed the threshold (and therefore

likely to create echo). This may result in suppression of

the signal. Adaptive filtering is also applied to track the

echo path impulse in response to provide echo free and

full-duplex user experience. The embedded noise

reduction algorithm helps to extract clean speech sig-

nals from the noisy inputs captured by microphones

and improves mutual understanding in communication.

Advanced audio features, such as multi-band dynamic

range control, parametric multi-band equalizer, audio

widening and virtual bass are in-built. The audio effect

algorithms are to improve the user’s audio listening

experience in terms of better quality audio after audio

signal processing.

Figure 2-1 and Figure 2-2 illustrate the processing flow

of speaker phone applications for speech and audio

signal processing.

FIGURE 2-1:

SPEECH PROCESSING

FIGURE 2-2:

AUDIO PROCESSING

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