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參數資料
| 型號： | SAA2520GP |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Stereo filter and codec for MPEG layer 1 audio applications |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 14 X 14 X 2.20 MM, PLASTIC, QFP-44 |
| 文件頁數： | 23/36頁 |
| 文件大小： | 151K |
| 代理商： | SAA2520GP |
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August 1993
23
Philips Semiconductors
Preliminary specification
Stereo filter and codec for MPEG layer 1
audio applications
SAA2520
I
NTERNAL
S
ETTINGS
(LTCNT1 =
LOGIC
1, LTNCT 0 =
LOGIC
0)
The operation of the codec is controlled by the bits transferred in this mode.
Table 8
Internal Settings (LTCNT1 = logic 1, LTNCT 0 = logic 0).
Table 9
Internal Settings (LTCNT1 = logic 1, LTCNT0 = logic 0).
msb
lsb
name
function
valid in
S15
S11
...
...
S12
S10
bit rate index
sample frequency
bit rate indication
44.1, 48 or 32 kHz
indication
1 = decode; 0 = encode
1 = external;
0 = internal 256FS
1 = 2-CH mono;
0 = stereo
1 = mute; 0 = no mute
not used
1 = CH1; 0 = CH2
transparent bits
emphasis indication
encode
encode
S9
S8
decode
EXT 256FS
encode/decode
encode/decode
S7
2-channel mono
encode
S6
S5
S4
S3
S1
MUTE
encode/decode
CH1
Tr0 to Tr1
EMPHASIS
decode
encode
encode
...
...
S2
S0
msb
lsb
bit rate
1
1
0
0
1
0
1
1
0
0
1
0
0
0
0
0
384 kbits/s
256 kbits/s
192 kbits/s
128 kbits/s
default value
The bit rate index indicates the bit rate of the encoded
signal and is only effective in the encode mode.
The decode bit determines the operation mode of the
SAA2520. The default value is logic 1 (decoding mode).
EXT 256FS in the encoding mode determines whether or
not the SAA2520 is master or slave of the Filtered-I
2
S
interface (default is logic 0, master mode).
2CH MONO is used in the encoding mode to determine
whether the sub-band signal is generated as a stereo or
2-channel mono signal. Default value is logic 0.
MUTE is used in both the encoding and decoding modes
to mute the information to or from the Filtered-I
2
S interface
(the default value is logic 0).
CH1 is utilized in the decoding mode to select one of the
2-channel mono signals to be decoded (default is
I - channel 1). A value of 0 results in channel 2 being
decoded).
The transparent bits are copied in the sub-band signal,
default is 00.
The information from S15 to S10, S7 and S3 to S0 will be
copied into the sub-band signal.
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