AK4636 Datasheet, PDF (59/105 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK/Video-AMP

[AK4636]
■ 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, DVOL bits = F5H). 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, DVOL bits
= F5H). If the soft mute is cancelled within the 245/fs cycles (31msec@fs=8kHz, DVOL bits = F5H), 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
0dB
A tte n u a tio n
245/fs
(1)
245/fs
(3)
-∞
Analog O utput
GD
GD
(2)
Figure 48. Soft Mute Function
(1) The input signal is attenuated by −∞ (“0”) in 245/fs cycles (31msec@fs=8kHz, DVOL bits = F5H).
(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, DVOL bits = F5H), the attenuation is
discounted and returned to 0dB within the same cycle.
MS1012-E-01
- 59 -
2010/08