CDB6420 Просмотр технического описания (PDF) - Cirrus Logic

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CDB6420

Full-Duplex Speakerphone Chip

Cirrus Logic 

CS6420

GLOSSARY

Echo

A signal that returns to its source after some delay.

Network Echo

Echo resulting from signal reflection due to an impedance mismatch in a 2-to-4 wire converter

(hybrid).

Acoustic Echo

Echo created by signal propagation in a room from a speaker to a microphone.

Reverberation

Local information that bounces around the room before it reaches the microphone. An example

of reverberation is when your back is to the speakerphone, and your voice bounces off the wall

before it reaches the microphone.

Near-End

The location with the acoustic interface (speaker and microphone).

Far-End

The location connected to the network interface.

Transmit Path

The signal path from Near-End input to Far-End output.

Receive Path

The signal path from Far-End input to Near-End output.

Full-Duplex

The state when both Transmit and Receive paths are simultaneously active.

Half-Duplex

The state when either Transmit or Receive path is active.

Supplementary Echo Suppression

Dynamic attenuation placed in the opposite path of the active path to mask residual echo. For

example, if the receive path is active, the transmit path is attenuated. When both paths are

simultaneously active, the suppression attenuation is removed. See the section on Suppression

in Design Considerations for more details.

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DS205PP2

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