[AK4634]
■ SOFTMUTE
Soft mute operation is performed in the digital input domain. When the SMUTE bit changes to “1”, the input signal is
attenuated by −∞ (“0”) in 245/fs cycles (31msec@fs=8kHz). When the SMUTE bit is returned to “0”, the mute is
cancelled and the input attenuation gradually changes to 0dB in 245/fs cycles (31msec@fs=8kHz). If the soft mute is
cancelled within the 245/fs cycles (31msec@fs=8kHz), the attenuation is discontinued and returned to 0dB. The soft mute
for Playback operation is effective for changing the signal source without stopping the signal transmission.
SMUTE bit
245/fs
(1)
245/fs
0dB
(3)
Attenuation
-∞
GD
GD
(2)
Analog Output
Figure 40. Soft Mute Function
(1) The input signal is attenuated by −∞ (“0”) in 245/fs cycles (31msec@fs=8kHz).
(2) Analog output corresponding to digital input has group delay (GD).
(3) If the soft mute is cancelled within the 245/fs cycles (31msec@fs=8kHz), the attenuation is discounted and returned to
0dB within the same cycle.
MS0983-E-00
2008/07
- 49 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
