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參數(shù)資料
| 型號(hào)： | SAA2500H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | MPEG Audio Source Decoder |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, SOT-307-2, QFP-44 |
| 文件頁數(shù)： | 13/47頁 |
| 文件大?。?/td> | 199K |
| 代理商： | SAA2500H |
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September 1994
13
Philips Semiconductors
Preliminary specification
MPEG Audio Source Decoder
SAA2500
Decoding control signals
The decoding is performed by 3 signals as shown in
Table 6.
Table 6
Signals for decoding control.
The master reset signal RESET forces the SAA2500 into
its default state when HIGH. RESET must stay HIGH
during at least 24 MCLKIN periods if MCLKIN has
frequency 24 MHz (i.e. MCLK24 = 1) or 12 MCLKIN
periods if MCLKIN has frequency 12 MHz (MCLK24 = 0).
At a reset, the SAA2500 synchronization to the input
bitstream is lost, the subband filter and baseband audio
output signals are muted, and the SAA2500 settings are
initialised.
The decoding can be stopped by making input signal
STOP HIGH. Stopping the decoding forces the SAA2500
to end decoding of input data, yet feeding zeroed subband
samples to the synthesis subband filter bank to create a
soft muting. When using the master input, input requesting
is also stopped. CDMWS stays in its current state while
STOP is asserted. The SAA2500 assumes the input
synchronisation to be lost when the decoding is stopped,
SIGNAL
DIRECTION
FUNCTION
RESET
input
reset SAA2500 to
default state
stop decoding
unreliable input data;
interrupt decoding
STOP
URDA
input
input
thus causing re-synchronization when STOP is
de-activated again. Then the SAA2500 mutes, meanwhile
searching for a frame sync pattern or frame sync pulse (the
synchronisation mode is selected via the L3 control bus) at
the input.
If synchronisation is found, the SAA2500 starts producing
output data. The maximum response time to the activation
of signal STOP is half a sample period; the
re-synchronisation time after STOP going LOW again
differs in various situations.
An ‘unreliable data’ indication can be given to the
SAA2500 by making signal URDA HIGH. URDA, like
STOP, mutes the subband signals and forces the
SAA2500 out of synchronisation. However, in contrast to
STOP, master input data requesting continues at the bit
rate that was decoded before URDA became active. The
maximum response time to URDA is half a sample period.
Coded data interfaces
The SAA2500 contains:
A coded data master input interface
A coded data slave input interface.
T
HE CODED DATA MASTER INPUT INTERFACE
When using the master input, the SAA2500 requests for
input data. With the master input, the coded input data may
not use the ISO/MPEG free format bit rate. The coded data
master input interface consists of 4 signals (see Fig.7).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SAA2501 | Digital Audio Broadcast DAB decoder |
| SAA2501H | Digital Audio Broadcast DAB decoder |
| SAA2502 | ISO/MPEG Audio Source Decoder |
| SAA2502H | ISO/MPEG Audio Source Decoder |
| SAA2503 | MPEG2 audio decoder(MPEG2 音頻譯碼器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SAA2500HB-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Video Processing/ENDEC for MPEG |
| SAA2501 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Audio Broadcast DAB decoder |
| SAA2501H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Digital Audio Broadcast DAB decoder |
| SAA2501HB-S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Digital Audio Decoder & Support |
| SAA2502 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:ISO/MPEG Audio Source Decoder |
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