BM63 datasheet(13/56 Pages) MICROCHIP

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Advance Information

DS60001431A-Page 13

BM63

2.0

AUDIO

The input and output audios have different stages and

each stage can be programmed to vary the character-

istics of the gain response. For microphones, both sin-

gle-ended 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 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

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 is monitored and adjusted to avoid satura-

tion of speaker output or microphone input. Adaptive fil-

tering 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 signals from a noisy input

captured by the 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

improve

the

user’s

audio

listening

experience in terms of better quality 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 SIGNAL PROCESSING

FIGURE 2-2:

AUDIO SIGNAL PROCESSING

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