R261 datasheet(13/28 Pages) ONSEMI

13 / 28 page

BelaSigna R261

http://onsemi.com

Architecture Detailed Information

The architecture of BelaSigna R261 is shown in Figure 5.

Interrupt

Controller

Power Mgt

PLL and

Clock

Detection

Algorithm

Protection

Timers

SPI

UART

Output

Driver0

GPIO

BelaSigna R261

Preamps

A/D

PCM/I2S

Interpolation

D/A

Ch0

Ch1

DMIC

LSAD

Debug

Port

Custom

Handler

DSP−Based

Application Controller

Two−Microphone

Noise Reduction

(BSE)

Algorithm

Control

Sleep Mode

Control

H/W Config

Selection

Boot

Selection

Command

Handler

Mode

Switching

System

Monitoring

Figure 5. BelaSigna R261 Architecture: A Complete Audio Processing System

I2C

Mode

Decimation

I2C

Two−Microphone Noise Reduction System

Blind Speech Extraction (BSE) from Exaudio AB

BelaSigna R261 contains the BSE algorithm inside its

ROM memory. Exaudio offers a unique solution to the

problem of blindly extracting wave propagating signals

using one or more sensors without having any prior

knowledge about source’s or sensor’s positions. The

solution operates simultaneously in the frequency, temporal

and the spatial domain using one global optimization

criterion, with no constraints on the number of sources vs.

the number of sensors. The solution is Signal−to−Noise

Ratio (SNR) independent, meaning that it operates

optimally in both low SNR as in high SNR environments and

at the same time it performs de−reverberation of the received

signals. The solution is ideal for electronic communication

devices such as mobile phones and portable computers

where it is desired to extract useful speech signals hidden in

various noise fields. The flexibility offered by Exaudio’s

solution allows for flexible microphone positioning and

arbitrary placement of the self adaptive device in the actual

environment.

Algorithm Modes

The noise reduction algorithm built into BelaSigna R261

has two algorithm modes called Algorithm Mode 0 and

Algorithm Mode 1. Algorithm Mode 0 is optimized for

far−talk applications where the end user can be very far from

the microphones (up to 6 meters) such as laptops or

speakerphones (including cell phones in a speakerphone

mode). This algorithm mode is also known as “Conference

Mode”. Algorithm Mode 1 is optimized for close−talk

applications where the end user is close to the microphones

(< 5 cm) such as telephony handset (including cell phones

in a handset mode).

A Custom Algorithm Mode is also available in BelaSigna

R261; it allows supporting special configurations and tuning

by loading new algorithm parameters via an external

EEPROM or the I2C control interface. The algorithm

performance can be optimized for specific applications,

microphones types and positioning as well as other system

parameters via this mechanism.

For additional details on the custom mode handler and

algorithm performance tuning options, please refer to

“BelaSigna R261 Configuration & Communications

Guide.”

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