參數(shù)資料
型號(hào)： LC89057W-VF4-E
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： 7 X 7 MM, SQFP-48
文件頁(yè)數(shù)： 22/61頁(yè)
文件大?。?/td> 355K
代理商： LC89057W-VF4-E
LC89057W-VF4-E
No. 7202-29/61
8.7 IEC61937, DTS-CD/LD Detection Flag Output
A function to output IEC61937 and DTS-CD/LD detection flags for non-PCM data is provided.
When the UNPCM non-PCM signal output setting is selected through the INT output contents setting, an interrupt
signal is output from INT upon detection of an IEC61937 or DTS-CD/LD sync signal. Non-PCM signal details can
be known by reading this information from the output register.
When channel status bit 1 is non-PCM data ("1"), the IEC61937 sync signal is detected and output. If bit 1 is PCM
data, the IEC61937 sync signal is not output.
DTS-CD/LD sync signal detection is done based on the sync pattern and the base frequency. In the case of DTS-ES
data detection, output is performed when the DTS5.1 channel sync signal is detected and the DTS-ES sync pattern
has been verified.
The IEC61937 and DTS-CD/LD detection flags are cleared when fs has changed or upon occurrence of a PLL lock
error or data error.
Since the DTS sync signal is provided within the audio data, digital data with the same code as the DTS sync signal
may in rare cases exist for regular CD/LD records that are not recorded in the DTS format. Protection using the sync
pattern or base frequency is provided so that such data is not misinterpreted as DTS-CD/LD detection flags. The
detection sequence is shown below.
Frame counter
rese
NO
YES
NO
YES
NO
YES
NO
YES
Input data
DTS-CD/LD SYNC
detection
*
512
=>
512 or 1024
1024
=> 1024 or 2048
2048
=>
2048 or 4096
4096
=>
4096
1st count
2nd count
DTS-CD/LD
data hold
Frame counter
start
YES
NO
YES
PaPb
detection
Bit 1 detection
Bit 1 = 1
PaPb detection
during 4096
frames
IEC61937 flag OK
INT lowered
IEC61937 flag
not valid
INT lowered
PaPb detection
during 4096
frames
IEC61937 data hold
*Depending on the frame count,
the subsequent detection count
is expanded up to x2.
Periodic fluctuation is supported.
Frame count
512, 1024, 2048, 4096
SYNC detection
Frame count
512, 1024, 2048, 4096
SYNC detection
Frame count hold
x2 count detection
expansion
DTS-CD/LD flag OK
INT lowered
DTS-CD/LD flag
not valid
INT lowered
Frame counter
rese
Frame counter
start
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