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(yè)數(shù): 20/47頁(yè)
文件大小: 199K
代理商: SAA2500H
September 1994
20
Philips Semiconductors
Preliminary specification
MPEG Audio Source Decoder
SAA2500
A leading edge in signal TB indicates the start of each TO
frame. The length of each TB pulse is one sample period;
TB is HIGH during a S[0,L] and S[0,R] pair. Signal TA
being HIGH indicates muting of TO due to input data errors
(see Fig.13).
TA can only change value at each TB leading edge, i.e.
after each 384 sample periods (ISO/MPEG layer I input
data) or 1152 sample periods (ISO/MPEG layer II input
data): only whole frames are marked to be correct or
muted. As shown in detail in Fig.13, transitions of TB and
TA take place one SCK period before a trailing edge of
WS.
The optionally processed subband data TI must be
synchronous to SCK and WS. Furthermore, the subband
index of the TI samples must be synchronised to TB: a
subband 0 sample pair must be input when TB is HIGH (as
shown in Fig.12). This means that the delay of the external
processing is allowed to be any integer multiple of
32 sample periods. If no external processing is to be
applied, TO must be input back directly to TI.
The baseband output interface
The decoded baseband audio data is output in an I
2
S-like
format (see Fig.14).
The output interfacing consists of 3 signals (see Table 11).
Fig.13 Filter data error flag (TA) timing.
handbook, full pagewidth
WS
TB
TA
SCK
WS
TB
TA
SCK
WS
TB
TA
1
2
3
4
MGB501
384 (layer I)
1152 (layer II)
1
2
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