AK4950 Datasheet, PDF (57/106 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP & mini DSP

[AK4950]
■ Soft Mute
Soft mute operation is performed in the digital domain. When the SMUTE bit is set “1”, the output signal is attenuated to
-∞ in 10ms@fs =44.1kHz. When the SMUTE bit is returned to “0”, the mute is cancelled and the output attenuation
gradually changes to the value set by DVOL7-0 bits from -∞ in 10ms@fs =44.1kHz. If the soft mute is cancelled before
attenuating to -∞, the attenuation is discontinued and the volume returns to the level set by DVOL7-0 bits in the same
cycle. The soft mute function is effective for changing signal source without stopping the signal transmission at playback
path. SMUTE bit is invalid during an ALC operation.
SMUTE bit
TBD
0dB
(1)
Attenuation
TBD
(3)
-∞
GD
GD
(2)
Analog Output
Figure 40. Soft Mute Function
(1) The input signal is attenuated to −∞ (“0”) during 10ms@fs =44.1kHz.
(2) Analog output corresponding to digital input has group delay (GD).
(3) If soft mute is cancelled before attenuating to −∞, the attenuation is discounted and returned to the level set by
DVOL7-0 bits within the same cycle.
MS1320-E-00
- 57 -
2011/10