AK4634 Datasheet, PDF (49/77 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

[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”) during the cycle of 245/fs (31msec@fs=8kHz). When the SMUTE bit is returned to “0”, the mute
is cancelled and the input attenuation gradually changes to 0dB during the cycle of 245/fs (31msec@fs=8kHz). If the soft
mute is cancelled within the cycle of 245/fs (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
0dB
A tte n u a tio n
245/fs
(1)
245/fs
(3)
-∞
GD
GD
(2)
Analog O utput
Figure 40. Soft Mute Function
(1) The input signal is attenuated by −∞ (“0”) during the cycle of 245/fs (31msec@fs=8kHz).
(2) Analog output corresponding to digital input has the group delay (GD).
(3) If the soft mute is cancelled within the cycle of 245/fs (31msec@fs=8kHz), the attenuation is discounted and returned
to 0dB within the same cycle.
Rev. 0.5
- 49 -
2007/10