BM83 datasheet(16/76 Pages) MICROCHIP

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outgoing signal level to the speaker is monitored and adjusted to avoid saturation of speaker output or microphone

input. Adaptive filtering is also applied to track the echo path impulse in response, to provide an echo free and full-

duplex user experience.

The embedded noise reduction algorithm helps to extract clean speech signals from the noisy inputs captured by the

microphones and improves communication.

In addition to NR/AEC function, audio effect functions such as Multiband Dynamic Range Compression (MB-DRC),

virtual bass enhancement (VB), and audio widening (AW)), for A2DP audio streaming are also available to enhance

the audio quality for various applications. For mono speaker/speakerphone and stereo headset applications, MB-

DRC and VB can be enabled to have better audio clarity. For stereo speaker/speakerphone applications, in addition

to MB-DRC and VB, AW can be enabled to provide better live audio effect for the users.

The following figures illustrate the signal processing flow of speakerphone applications for speech and audio signal

processing.

Figure 3-2. Speech Signal Processing

Antenna

MCU

CVSD/A-Law/

μ-Law/MSBC

Decoders

CVSD/A-Law/

μ-Law/MSBC

Encoders

Far-end

HPF

DAC

Audio

Amplifier

Speaker

Equaliser

Near-end

NR/AES

AEC

HPF

ADC

Microphones

BM83

DSP

Equaliser

SRC

Digital

MIC Gain

Additive

Background Noise

Figure 3-3. Audio Signal Processing

Antenna

MCU

SBC/AAC

Decoders

Audio

Effect

Equaliser

Speaker

DSP

BM83

Amplifier

Audio

SRC

DAC

(Speaker

Gain)

Line-In

ADC

External Audio

Source

Note:

The DSP parameters can be configured using the Config Tool.

3.2

Codec

The built-in codec has a high SNR performance and it consists of an ADC, a DAC and an additional analog circuitry.

The internal codec supports 20-bit resolution for DAC and 16-bit resolution for ADC.

• Interfaces

– Two mono differential or single-ended MIC inputs

– One stereo single-ended line input

– One stereo single-ended line output

BM83

Audio Subsystem

Datasheet

DS70005402C-page 16

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