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參數(shù)資料
| 型號： | TEA2028-TEA2029 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | APPLICATION NOTE |
| 中文描述： | 應(yīng)用筆記 |
| 文件頁數(shù)： | 29/47頁 |
| 文件大?。?/td> | 532K |
| 代理商： | TEA2028-TEA2029 |
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16.66ms
20ms
50Hz
Sync
60H z
Sync
15.773ms
17.696ms
19.744ms 20.128ms
L247
L277
L309
L315
W
R(60Hz)
W
R(50Hz)
2
Figure57
V.6.3.1- 50/60HzStandard recognition
This function is performed by two shift registers
which are loaded by sync pulses(if present) and if
thesepulses fall within the time interval specific to
eachstandard.Theseintervalsarecalled”Register
Windows” andlabeled ”W
R
(50)” and W
R
(60).
A. 50Hz STANDARD RECOGNITION
This identification is consideredvalid if twosuces-
sive sync pulses applied to 50Hz shift register fall
within the 50Hz window ”W
R
(50)”. At the time of
synchronization capture, the first pulse will reset
the counters. The second pulse, if present, will
then trigger the 50Hz identification 20ms later
[I
D
(50) = 1].
The identificationis not valid iftwosucessive50Hz
pulses arenotdetected.Identificationsignalisalso
used toreducetheverticalsynchronizationwindow
in 50Hz standard thereby offering excellent noise
immunity against noise susceptible to be present
in sync signal and hence good displaystability.
B. - 60Hz STANDARD RECOGNITION
This identificationis validatedafterthreesucessive
sync pulses at 16.6
μ
s periodhave been detected.
Three pulses are necessaryto ascertainthe iden-
tificationpriorto switchingthesaw-toothamplitude.
The identificationsignal [I
D
(60)= 1] is also used to
reduce the synchronization window and,in case of
one ortwomissing pulsescloseto 60Hz,to setthe
free-runningfrequency.
V.6.3.2 - Vertical synchronization window -
Free-running period
In the absence of sync pulse various free-running
periodsarespecified.Since verticalscanningmust
be always active, these free-running periods must
be higher thanthose of 50 and 60Hz standardsso
as to ensure synchronization.
An other window, allowing synchronizationonly at
the end of scanning,is alsonecessary. Upon syn-
chronization,this window will allow vertical flyback
only at the bottom of screen. This window should
be narrow for good noise immunity but also wide
enough to yield, upon synchronization, a capture
time unperceptibleon screen.
In our case, as long as no standard identification
takesplace the windowwill remain wide, and once
one of the standards has been identified, the win-
dow will be considerablyreduced.
InVCRmode,thiswindowwillbealwayswidesince
framefrequenciesdeliveredin high-speedsearch,
slow review and picture pause modes are very
much variable and must be taken into considera-
tion.
Intheabsenceoftransmission(Mute=0), synchro-
nization is disabled (so as to avoid incorrect syn-
chronization due to noise) and the free-running
frequency is around 50Hz. This will eliminate the
occurrenceof picture overlay at theend of trace at
a lower free-running frequency.
Register’s
Window
L247
L277
L309 L315
L361
50Hz
60Hz
Free-running Period
Reset
Reset
Reset
Reset
W
R(60)
W
R(50)
W
R(WIDE)
W
R
= 0
Mute = 1
Mute = 1
Mute = 1
No Transmission
(Mute = 0)
50HzStandard
60Hz Standard
I
D60
= 1
I
D50
= 1
I
D50
= 0, I
D60
= 0
or VCR Mode
2
Figure 58 :
Definitionof SynchronizationWindows and Free-runningPeriods
TEA2028 - TEA2029 APPLICATIONNOTE
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