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1999 Apr 14 20
Philips Semiconductors Product specification
Audio processor with head amplifier for VHS hi-fi TDA9605H
7.4 Control byte at subaddress 00H
The control byte is used to set the parameters of hi-fi processing and head amplifier control.
7.4.1 A
UDIO FM MODE
Bit AFM controls the main mode of the hi-fi processing and head amplifier. The function of other bits of the control byte
and bit EOS of the output byte depends on the state of bit AFM.
Table 9 Audio FM mode selection (bit AFM)
7.4.2 PLAYBACK MODE
When during the playback mode no FM carrier is detected from tape, the normal audio signal on pin LININ is
automatically selected by the output select function.
For this auto-normal mode:
• The timing of the hi-fi carrier detection can be selected via bit DETH which defines the auto-normal release time:
– Fast mode: hi-fi detection delay is 1 to 2 HID control signal periods (for NTSC: 33 to 66 ms; for PAL: 40 to 80 ms)
– Slow mode: hi-fi detection delay is 7 to 8 HID control signal periods (for NTSC: 233 to 267 ms;
for PAL: 280 to 320 ms).
• The state of hi-fi detection and auto-normal can be monitored by I
2
C-bus control bit AUTN of the read byte.
• In case automatic selection of the normal audio signal is not required the normal input level control can be set to mute
(bits NIL3 to NIL0 of the select byte).
Table 10 Dropout cancelling (bit DOC), sample-and-hold high-state (bit SHH) and detector time hi-fi (bit DETH) in the
playback mode; note 1
Note
1. X = don’t care.
Playback head amplifier disable standard operating mode and playback
disabled
HPD
Power output muting power mute MUTE
Operating mode standard operating mode, active standby
and passive standby
STBP and STBA
AFM MODE DESCRIPTION
0 playback hi-fi processing in playback mode and head amplifier in playback mode
1 record hi-fi processing in record mode and head amplifier is in record mode or record-mute mode
AFM DOC SHH DETH MODE DESCRIPTION
0 0 X X playback and DOC off dropout cancelling disabled
0 1 X X playback and DOC on dropout cancelling active
0 X 0 X playback and sample-and-hold time = 6 µs head switch noise cancel time set to 6 µs
0 X 1 X playback and sample-and-hold time = 8 µs head switch noise cancel time set to 8 µs
0 X X 0 playback and hi-fi detect = fast fast mode hi-fi detector timing
0 X X 1 playback and hi-fi detect = slow slow mode hi-fi detector timing
FUNCTION MODES CONTROL BITS