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CS6420 Datasheet(PDF) 14 Page - Cirrus Logic |
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CS6420 Datasheet(HTML) 14 Page - Cirrus Logic |
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14 / 52 page  CS6420 14 DS205PP2 Register 1 * Denotes reset value Table 4. Register 1 Bit Definitions HD - Half-Duplex Disable In normal operation, the CS6420 will be in a half- duplex mode if the echo canceller is not providing enough loop gain reduction to prevent howling. This half-duplex mode would be active at power- up, for example, before the adaptive filter has had a chance to adapt. This half-duplex mode prevents howling and also masks the convergence process. In some cases, such as when measuring conver- gence speed (see Testing Issues), the half-duplex mode is undesirable. By default, the half-duplex mode is enabled. RSD - Receive Suppression Disable The Receive Supplementary Echo Suppression function is a non-linear echo control mechanism. Supplementary Echo Suppression attenuates sig- nals in the receive direction by 24 dB when far-end speech is absent in the receive path. The attenua- tion is released only when the receive channel is ac- tive. It is also designed to not be triggered by b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0 HD RSD Taps NCC TVol RGain 0 1 0 0 0 10 00 01010 00 0 1 0 Bits Name Function Word Operation 15 HD Half-Duplex Disable 0* 1 enable half-duplex disable half-duplex 14 RSD Rx Suppression Disable 0* 1 enable Rx suppression disable Rx suppression 13-12 Taps AEC/NEC Tap Allocation 00 01 10* 11 444/0 (55.5ms/disabled) 380/128 (47.5ms/16ms) 316/192 (39.5ms/24ms) 252/256 (31.5ms/32ms) 11-10 NCC NEC Coefficient Control 00* 01 10 11 Normal Clear Freeze reserved 9-5 TVol Tx Volume Control 00000 00001 --- 00100 --- 01010* 01011 --- 11101 11110 11111 +30 dB +27 dB +18 dB +0 dB -3 dB -57 dB -60 dB mute 4-3 RGain Rx Analog Gain 00* 01 10 11 0 dB 6 dB 9.5 dB 12 dB |
Similar Part No. - CS6420 |
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Similar Description - CS6420 |
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