2003 Oct 21 34
Philips Semiconductors Product specification
Car radio integrated signal processor TEF6890H
11.2.7 SUBADDRESS 9H; SOFTMUTE
Table 33 Format of data byte 9H with default setting
Table 34 Description of data byte 9H
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
MST2 MST1 MST0 MSL1 MSL0 UMD1 UMD0 SMON
01101011
BIT SYMBOL DESCRIPTION
7 to 5 MST[2:0] Soft mute start. α
mute
= 3 dB; see Fig.12.
4 and 3 MSL[1:0] Soft mute slope. See Fig.13.
2 and 1 UMD[1:0] USN mute depth. Maximum soft mute attenuation of the soft mute via USN control;
see Fig.14.
0 SMON Soft mute enable. 0 = disable; 1 = enable.
handbook, halfpage
0.25 0.75
V
eq
(V)
1.25 1.75
α
mute
(dB)
2.25
0
60
48
36
24
12
MHC339
(1) (5) (6) (7) (8)
(2) (3) (4)
Fig.12 Soft mute attenuation α
mute
as a function of
equivalent level voltage V
eq
(start).
(5) MST[2:0] = 100 = 1.25 V.
(6) MST[2:0] = 101 = 1.5 V.
(7) MST[2:0] = 110 = 1.75 V.
(8) MST[2:0] = 111 = 2 V.
MSL[1:0] = 11
(1) MST[2:0] = 000 = 0.75 V.
(2) MST[2:0] = 001 = 0.88 V.
(3) MST[2:0] = 010 = 1 V.
(4) MST[2:0] = 011 = 1.12 V.
handbook, halfpage
0.25 0.5 1.5
V
eq
(V)
0
6
18
24
12
0.75 1
α
mute
(dB)
1.25
MHC340
(4)
(2)
(1)
(3)
Fig.13 Soft mute attenuation α
mute
as a function of
equivalent level voltage V
eq
(slope).
MST[2:0] = 000
(1) MSL[1:0] = 00 = 8 dB/V.
(2) MSL[1:0] = 01 = 16 dB/V.
(3) MSL[1:0] = 10 = 24 dB/V.
(4) MSL[1:0] = 11 = 32 dB/V.
