SAA2521GP Philips, SAA2521GP Datasheet - Page 18

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

Philips Semiconductors
Sample frequency indication.
MODE identification.
August 1993
Masking threshold processor for MPEG
layer 1 audio compression applications
MSB LSB
MSB
LTENA/C
LTCLK(C)
LTDATA(C)
LTCNT0(C)/1(C)
00
01
10
11
00
01
10
11
bit :
stereo
joint stereo
2 - channel
mono
1 - channel
mono
MODE
44.1 kHz
48 kHz
32 kHz
LSB
--
T :
Fig.14 Order of appearance of bits on the interface.
L and R
L and R
I or II as selected
mono, no selection
8
default value
do not use
9
OUTPUT
1
0
1
1
1
2
1
3
1
4
18
1
5
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.
0
1
2
3
4
5
6
7
Preliminary specification
MBC133
SAA2521