TEF6901A_3 © NXP B.V. 2008. All rights reserved.
Product data sheet Rev. 03 — 20 March 2008 50 of 107
NXP Semiconductors
TEF6901A
Integrated car radio
8.2.16 Write mode: data byte SOFTMUTE
[1] When for an external audio source dynamic compression is enabled (bit COMP is logic 1) the MSL setting
controls the compression ratio. For default 2 : 1 compression MSL = 01 is used; see Table 82.
[1] When for an external audio source dynamic compression is enabled (COMP = 1) the MST setting controls
the compression range. For default full compression MST = 7 is used; see Table 81.
Table 65. SOFTMUTE - format of data byte 0Eh with default setting
7 6 5 4 3 2 1 0
MST2 MST1 MST0 MSL1 MSL0 UMD1 UMD0 MSLE
01101010
Table 66. SOFTMUTE - data byte 0Eh bit description
Bit Symbol Description
7 to 5 MST[2:0] soft mute start; start setting of the soft mute; for FM see
Table 67 and
Figure 28; for AM see Table 68 and Figure 29
4 and 3 MSL[1:0] soft mute slope
[1]
; slope setting of the soft mute (α
10 kHz
/V
eq.LEVEL
); for
FM see
Table 69 and Figure 28; for AM see Table 70 and Figure 29
2 and 1 UMD[1:0] USN soft mute depth; setting of the maximum attenuation of the USN fast
soft mute control; see
Figure 30
00 = 3 dB
01 = 6 dB
10 = 9 dB
11 = 12 dB
0 MSLE soft mute slope extension; additional slope setting of the soft mute; for
FM see
Table 69 and Figure 28; for AM see Table 70 and Figure 29
Table 67. Start of soft mute control weak signal processing; FM mode
[1]
MST2 MST1 MST0 Soft mute control start (V
eq.LEVEL
)
0 0 0 0.88 V
0 0 1 1.0 V
0 1 0 1.12 V
0 1 1 1.25 V
1 0 0 1.38 V
1 0 1 0.75 V
1 1 0 0.81 V
1 1 1 0.94 V
