Record Mode; System Standard Selection - Philips TDA9605H Datasheet

Philips Semiconductors
Audio processor with head amplifier for VHS hi-fi
7.4.3 R
ECORD 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
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

AFM DOC SHH
1 0 0
1 0 0
1 0 1
1 0 1
1 1 0
1 1 0
1 1 1
1 1 1
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)
NTSC
0
1
Note
1. Power-on reset state.
1999 Apr 14
2
C-bus control, can also be changed to the record-mute mode by an external control
DETH MODE
0 record-mute
1 record and 3 dB mix
0 record and 4.5 dB mix
1 record and 6 dB mix
0 record and 8 dB mix
1 record and 9.5 dB mix
0 record and 11 dB mix
1 record and 12.5 dB mix
MODE
PAL
NTSC
record-mute and no recording output current; note 1
recording with 3 dB output carrier ratio (1 : 1.4)
recording with 4.5 dB output carrier ratio (1 : 1.7)
recording with 6 dB output carrier ratio (1 : 2)
recording with 8 dB output carrier ratio (1 : 2.5)
recording with 9.5 dB standard output carrier ratio (1 : 3)
recording with 11 dB output carrier ratio (1 : 3.5)
recording with 12.5 dB output carrier ratio (1 : 4.2)
hi-fi circuit in PAL mode
hi-fi circuit in NTSC mode; note 1
21
Product specification
TDA9605H
DESCRIPTION
DESCRIPTION