sync pulse การใช้

• A cable conducts the sync pulse from camera to sound recorder.
• An example of this is a video sync pulse generator.
• The format of the horizontal sync pulse varies.
• In signal processing terms, it compensates for the fall time and settling time following the sync pulse.
• The sync pulse is typically a sine wave of 50 or 60 Hz with an RMS amplitude of approximately 1 volt.
• The Super8 Sound Recorder could also " resolve " sound that had been recorded onto cassette tape with this new " digital " sync pulse.
• Short duration full carrier ( 100 % ) is the sync pulse and the 73 % is so called back porch ( black level ).
• So the measuring equipment's measure only the highest level ( sync pulse ) of a line waveform which is "'100 % " '.
• The sync pulse is normally 40 IRE below this 0 IRE value, so the total range covered from peak to trough of an all white signal would be 140 IRE.
• The " back porch " is the portion of each scan line between the end ( rising edge ) of the horizontal sync pulse and the start of active video.
• Note that this behavior differs somewhat from analog video interfaces, where the line transition is deemed to occur at the sync pulse, which occurs roughly halfway through the horizontal blanking region.
• The SpecDrum could also, in principle, be synchronized to other musical equipment, using a sync pulse sent and received from the ZX Spectrum's " ear " and " mic " audio input / output sockets.
• Two timing intervals are defined  the " front porch " between the end of displayed video and the start of the sync pulse, and the " back porch " after the sync pulse and before displayed video.
• Two timing intervals are defined  the " front porch " between the end of displayed video and the start of the sync pulse, and the " back porch " after the sync pulse and before displayed video.
• This pulse would trigger a gate which would sample the received video signal during the " back porch " which was a guaranteed black-level transmitted between the end of the line-sync pulse and the start of the picture information.
• If location, a camera is driven by a DC motor, with some sort of governor control to hold it fairly accurate at 24 fps, a sync pulse generator geared to the movement or motor shaft could be employed to provide the sync pulse output.
• If location, a camera is driven by a DC motor, with some sort of governor control to hold it fairly accurate at 24 fps, a sync pulse generator geared to the movement or motor shaft could be employed to provide the sync pulse output.
• These and the sync pulse itself are called the " horizontal blanking " ( or " retrace " ) " interval " and represent the time that the electron beam in the CRT is returning to the start of the next display line.
• Each word is preceded by a 3 ?s sync pulse ( 1.5 ?s low plus 1.5 ?s high for data words and the opposite for command and status words, which cannot occur in the Manchester code ) and followed by an odd parity bit.
• Instead, it compromises on a 449-line frame ( instead of the expected 450 ), with the back porch extended to 34 lines, and the front porch to 13, with an unaltered 2-line sync pulse-and the active image taking up 89 % of the total scan period rather than 91 %.