SAA2521GP Philips, SAA2521GP Datasheet - Page 15

• Manufacturer Part Number: SAA2521GP
• Description: Masking threshold processor for MPEG layer 1 audio compression applications
• Manufacturer: Philips

Philips Semiconductors
With stereo encoding, Left and Right channels are
designated L and R. This changes to channels I or II for
2-channel mono mode. If SCALE = logic 0 the transfer of
allocation information will be followed by the transfer of
scale factors. Each 16-bit transfer contains two scale
factor indices.
Algorithm showing the process of information transfer:
COUNT: = logic 0
SEND ALLOCATION (COUNT)
REPEAT
READ STATUS
UNTIL
READY-TO-RECEIVE
FOR COUNT: = 1 to 15
DO
SEND ALLOCATION (COUNT)
SEND SETTINGS
IF SCALE = logic 0
THEN
FOR COUNT; = logic 0 TO 31
DO
SEND SCALE FACTORS (COUNT)
August 1993
Masking threshold processor for MPEG
layer 1 audio compression applications
LTENA/C
LTCLK(C)
LTDATA(C)
LTCNT0(C)/1(C)
bit :
Fig.12 Order of interface bits during allocation information transfer.
A or SL :
8
9
1
0
1
1
1
2
1
3
15
1
4
1
5
0
1
2
3
4
5
6
7
Preliminary specification
SAA2521
MEA691