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1999 Apr 14 21
Philips Semiconductors Product specification
Audio processor with head amplifier for VHS hi-fi TDA9605H
7.4.3 RECORD MODE
During the record-mute mode, the recording output current on pin RECOUT is muted and the head amplifier is partly
disabled. The record mode, set by I
2
C-bus control, can also be changed to the record-mute mode by an external control
signal on pin RMHID. Sometimes the record-mute mode is named loop-through mode or EE mode.
Table 11 Dropout cancelling (bit DOC), sample-and-hold high-state (bit SHH) and detector time hi-fi (bit DETH) in the
record mode
Note
1. Power-on reset state.
7.4.4 S
YSTEM STANDARD SELECTION
Bit NTSC selects between the NTSC and PAL (SECAM) system carrier frequencies for the CCO modulators or PLL
demodulators and the band-pass filters. FM carrier frequencies of 1.3 and 1.7 MHz are used for the NTSC system where
1.4 and 1.8 MHz are used for the PAL system. Different code settings for the auto-calibration circuit assure proper
calibration using the standard HID control signal frequency of 29.97 Hz for NTSC mode and 25 Hz for PAL mode. After
auto-calibration is completed bit NTSC enables instant switching between the NTSC and PAL system.
Table 12 System standard selection (bit NTSC)
Note
1. Power-on reset state.
AFM DOC SHH DETH MODE DESCRIPTION
1000record-mute record-mute and no recording output current; note 1
1001record and 3 dB mix recording with 3 dB output carrier ratio (1 : 1.4)
1010record and 4.5 dB mix recording with 4.5 dB output carrier ratio (1 : 1.7)
1011record and 6 dB mix recording with 6 dB output carrier ratio (1 : 2)
1100record and 8 dB mix recording with 8 dB output carrier ratio (1 : 2.5)
1101record and 9.5 dB mix recording with 9.5 dB standard output carrier ratio (1 : 3)
1110record and 11 dB mix recording with 11 dB output carrier ratio (1 : 3.5)
1111record and 12.5 dB mix recording with 12.5 dB output carrier ratio (1 : 4.2)
NTSC MODE DESCRIPTION
0 PAL hi-fi circuit in PAL mode
1 NTSC hi-fi circuit in NTSC mode; note 1