R262 datasheet(14/28 Pages) ONSEMI

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BelaSigna R262

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Table 7. ALGORITHM PERFORMANCE

Parameter

Test Conditions

Value

Unit

CLOSE−TALK MODE (5 cm to 10 cm talking distance)

SNR Improvement (SNR−I)

White noise, 6 dB SNR

30.0

Babble noise, 9 dB SNR

20.6

Pink noise, 12 dB SNR

19.9

PESQ Improvement

White noise, 6 dB SNR

0.8

−

Babble noise, 9 dB SNR

0.3

−

Pink noise, 12 dB SNR

0.4

−

NEAR−TALK MODE (50 cm to 100 cm talking distance)

SNR Improvement (SNR−I)

White noise, 6 dB SNR

19.6

Babble noise, 9 dB SNR

10.6

Pink noise, 12 dB SNR

14.5

PESQ Improvement

White noise, 6 dB SNR

0.5

−

Babble noise, 9 dB SNR

0.4

−

Pink noise, 12 dB SNR

0.4

−

FAR−TALK MODE (2.5 m to 5 m talking distance)

SNR Improvement (SNR−I)

White noise, 6 dB SNR

14.7

Babble noise, 9 dB SNR

6.9

Pink noise, 12 dB SNR

11.1

PESQ Improvement

White noise, 6 dB SNR

0.7

−

Babble noise, 9 dB SNR

0.4

−

Pink noise, 12 dB SNR

0.5

−

Pick−Up Distance

BelaSigna R262 is a fully adaptive system that will

automatically adjust its signal processing algorithm

depending on the input conditions. The three modes

discussed in this document, close−talk, near−talk and

far−talk, all have distinct use cases. Each of these modes will

adjust the distance from the microphone that they effectively

capture speech based on the amount of noise present. As an

example, the close−talk algorithm will allow a pick−up

distance up to 15 cm in very quiet situations, whereas it will

shrink the pick−up distance down to between 5 cm and 10

cm when the noise around the microphone increases.

Close−talk mode is designed to handle high noise situations;

up to 90 dB SPL.

Near−talk mode is tuned to pick up speech within 50 cm

to 100 cm in a quiet environment, and will shrink the

pick−up distance down 20 cm to 30 cm if the noise level

increases. Given the extended pick−up distance, compared

to close−talk mode, voice is effectively captured in noise

situations up to 70 dB SPL with extremely good noise

reduction.

Far−talk mode is designed to handle lower noise levels (up

to 50 dB SPL) with a much larger pick−up distance.

Figures 5, 6 and 7 below show the optimal talking distance

for the three algorithm modes as a function of the input

signal−to−noiseratio. When designing BelaSigna R262 into

a device, it is important to assess the targeted use case of the

product and to consequently select an appropriate algorithm

mode. It is also important to realize that the three modes

discussed here are just examples of what can be obtained

with BelaSigna R262. Adjustment of the talking distance

and the noise reduction aggressiveness are just two of the

performance parameters that can be controlled.

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