SAA2521 datasheet(18/28 Pages) PHILIPS

18 / 28 page

August 1993

Philips Semiconductors

Preliminary speciﬁcation

Masking threshold processor for MPEG

layer 1 audio compression applications

SAA2521

Fig.14 Order of appearance of bits on the interface.

MBC133

LTENA/C

LTCLK(C)

LTDATA(C)

bit :

T :

911

111

234

012

345

LTCNT0(C)/1(C)

Sample frequency indication.

MODE identiﬁcation.

MSB

LSB

44.1 kHz

default value

48 kHz

32 kHz

do not use

MSB LSB

MODE

OUTPUT

stereo

L and R

joint stereo

L and R

2 - channel

mono

I or II as selected

1 - channel

mono

mono, no selection

Frequency Range Limitation

In encode mode the frequency range will be limited at

lower rates. This is implemented by making the samples of

higher frequency sub-bands equal to logic 0 before the

allocation calculation. This automatically ensures that

these sub-bands do not get any bits allocated.

The following table shows the sub-bands affected and the

resulting frequency range.

The transfer of either 8-bits or 16-bits is permitted for the

transfer of status information. When only 8-bits are

transferred, these will always form the first byte and may

be used in checking the ready-to-receive bit.

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