1995 Mar 21

11

Philips Semiconductors

Product specification

Audio FM processor for VHS hi-fi audio

TDA9610H

Control byte

Table 3

Bits of control byte

Table 4

Bits IPAF and RAF

Notes

1. The RAF bit can be overruled externally by applying a low-ohmic voltage to the RAF I/O (pin 14) either logic 0 or

logic 1 (0 or +5 V). The actual mode of the IC is determined by the level measured at this pin.

2. The two record modes are equal, only differing in their reaction to forcing RAF LOW at the RAF I/O pin; the status of

the IPAF bit determines whether the IC is switched to the playback or loop-through mode.

Table 5

Bit NTSC

Table 6

Bit PAFM

Note

1. Bit PAFM has the same effect as the internally generated mute signal from the modem part when no FM carrier is

detected during playback mode. If one (or both) of these signals is HIGH, the audio signal coming from the modem

is muted.

Table 7

Bit MUTE

BIT

DESCRIPTION

IPAF

Inverse Playback Audio FM; see Table 4

RAF

Record Audio FM; see Table 4

NTSC

National Television Standards Committee; television standard; see Table 5

PAFM

Playback Audio FM Mute; see Table 6

MUTE

Mute; see Table 7

IPAF

MODE

DESCRIPTION

0

0

playback

NR and modem in playback mode

1

0

loop-through

NR in record mode; modem not active [por]

0

1

NR and modem in record mode

1

1

NR and modem in record mode

NTSC

MODE

DESCRIPTION

0

PAL

modem set to PAL carrier frequencies [por]

1

NTSC

modem set to NTSC carrier frequencies

MODE

DESCRIPTION

0

−

1

PB mute

the signal from the modem is muted in playback mode

MUTE

MODE

DESCRIPTION

0

−

1

full mute

all audio outputs are muted [por]