TDA9875 datasheet(39/92 Pages) PHILIPS

39 / 92 page

1998 Feb 13

Philips Semiconductors

Preliminary speciﬁcation

Digital TV Sound Processor (DTVSP)

TDA9875

Table 25 De-emphasis

Table 26 Description of bits ADEEM1 and ADEEM2 (note 1)

Note

1. The FM de-emphasis gain is 0 dB at 40 Hz.

10.3.8

FM MATRIX REGISTER

10.3.8.1

Description

This register is used to select the proper dematrixing characteristics as appropriate for the standard of the received

carrier and the related sound mode identification. For the dematrixing, it is assumed that the output from sound carrier 1

is on channel L input.

10.3.8.2

Deﬁnition

Table 27 Subaddress 11 (notes 1 and 2)

Notes

1. X = don’t care.

2. The default setting at power-up is 00000000.

Table 28 Description of Subaddress 11 (bits B2 to B0)

B6 and B2

B5 and B1

B4 and B0

DE-EMPHASIS

000

µs (Europe)

001

µs

010

µs (M standard)

011

J17

100

off

NAME

HIGH/LOW

FUNCTION

ADEEM1,

ADEEM2

HIGH

Activates the adaptive de-emphasis function, which is required for certain satellite

FM channels. The standard FM de-emphasis must then be set to 75

µs.

LOW

The adaptive de-emphasis is off.

MSB

LSB

see Table 28

L OUTPUT

R OUTPUT

MODE

L input

mono 1

R input

mono 2

L input

R input

dual

R input

L input

dual swapped

100

2L input

− R input

R input

stereo Europe

101

stereo Korea

L input

R input

-------------------------------------------

L input

R input

–

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