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CDB6422

Enhanced Full-Duplex Speakerphone IC

Cirrus Logic 

CS6422

3.5.7 RDSRMP - RX DOUBLE-TALK SUPPRESSION RAMP RATE

When “Rx Double-talk Suppression attenuation” (RDbtS, Register 3) is set to a non-zero value, the

CS6422 will introduce a programmable amount of attenuation into the receive path during a double-

talk event. RDSRmp controls the decay rate of the receive double-talk attenuation (the attack rate is

~40 ms).

The ‘slow’ setting of RDSRmp results in an attenuation decay rate of about 1 second. The ‘normal’

setting of RDSRmp results in an attenuation decay rate of about 100 ms.

3.5.8 IDLTX - HALF-DUPLEX IDLE RETURN-TO-TRANSMIT

When IdlTx is enabled, the CS6422’s half-duplex engine will automatically switch into <Transmit>

mode from the <Idle> state. The <Idle> state is entered when the previously active channel has been

silent for the time period set by HDly (half-duplex Holdover Delay) in Register 2.

The use of IdlTx permits a full-duplex-like behavior when operating in half-duplex at the beginning of

a call. This benefit is most noticeable when the listener at the far end is using a handset.

When TSMde is set to ‘0’ (Noise Guard enabled), IdlTx is usually disabled. IdlTx is disabled by de-

fault.

DS295F1

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