CS6422-IS Cirrus Logic Inc, CS6422-IS Datasheet - Page 23

• Manufacturer Part Number: CS6422-IS
• Description: Speech Network Standard 12dB 20-Pin SOIC
• Manufacturer: Cirrus Logic Inc
• Type: Audio Processorr

Specifications of CS6422-IS

• Package: 20SOIC
• Maximum Transmitter Gain: 12 dB
• Typical Supply Current: 50 mA
• Typical Operating Supply Voltage: 5 V
• Applications: Speakerphones
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 598-1201-5

3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
DS295F1
PCSEN- PATH CHANGE SENSITIVITY
TDBTS - TX DOUBLE-TALK SUPPRESSION ATTENUATION
RDBTS - RX DOUBLE-TALK SUPPRESSION ATTENUATION
TSTHD - TRANSMIT SUPPRESSION THRESHOLD
TSBIAS - TRANSMIT SUPPRESSION BIAS
TSATT - TRANSMIT SUPPRESSION ATTENUATION
This parameter sets the amount of attenuation inserted into the transmit path when transmit suppres-
sion is engaged.
The Acoustic Interface is likely to have many path changes as people move about in the room where
the full-duplex speakerphone is being used. The sensitivity of the path change detector can be
changed with the PCSen bit. Set PCSen to ‘0’ for high sensitivity and ‘1’ for low sensitivity.
In any adaptive echo cancelling system, there is a trade-off between hearing echo and remaining in
full-duplex when the acoustic path changes. When PCSen is set to ‘0’ for high sensitivity, the CS6422
will tend to drop to half-duplex in the event of a path change, preventing the far-end listener from hear-
ing echo as the adaptive filter adjusts to the new path.
When PCSen is set to ‘1’ for low sensitivity, the CS6422 will tend to remain in full-duplex during the
path change, and the far-end listener may hear some residual echo as the adaptive filter adjusts to
the new path.
This parameter controls the amount of attenuation that is added to the transmit channel during dou-
ble-talk, that is, when parties at both ends of the link are speaking simultaneously.
This parameter controls the amount of attenuation that is added to the receive path during double-talk.
This parameter sets the ERLE requirement for discrimination between echo and near-end speech by
the transmit suppressor. See Section 4.1.4.1, “Transmit Suppression” for full details.
This bias level affects the ease with which near-end speech may break-in or be attenuated by far-end
echo which causes the transmit suppressor to engage. See Section 4.1.4.1, “Transmit Suppression”
for full details.
CS6422
CS6422
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