Service manual

A-12
PAL-M video output
A
Technical specifications
Nominal output level 0 dBV
Difference between black and blanking level 0 IRE or 7.5 IRE, selectable
Non-useful DC-component < ±30 mV
Output Video Stability
SCH phase jitter (Jitter free input) < 2 degr
pp
Line time jitter (Jitter free input) < ±2.5 ns
pp
Maximum color sub-carrier frequency deviation from input frequencyPAL and
NTSC
(measured during > 0.2 s) 0.045 ppm
Maximum sub-carrier frequency change rate,PAL system I and NTSC
(measured during > 0.2 s) 0.1 Hz/s
Burst amplitude variation < 2%PP
Video Performance
4)
Gain
Insertion gain 0 dB ±0.2 dB
3 dB ±0.2 dB (-3 dB input level)
Level stability ±0.10 dB / 1 hour
±0.15 dB / 24 hour
Noise
Quantization noise (unified weighted) < -58 dB RMS relative to 0.7V
Non-linear distortion
Differential gain ≤ 1% peak to peak
Differential phase ≤ 1.5° peak to peak
Linear waveform distortion
2T pulse response K2T ≤ 1.0%
2T pulse to bar 98% to 102% (KP/B ≤ 0.5%)
2T bar response 99.5% to 100.5%
50 Hz square wave response 99% to 100%
Bounce (700 mV 0.25 Hz square wave) Peak-overshoot ≤ 1%
Chrominance-luminance inequality
Gain (20 TC pulse) ≤ ±2%
Delay (20 TC pulse) ≤ ±10 ns
SCH phase error < ±5°
Steady State Characteristics
Frequency response (relative to
white bar) ±0.2 dB, 10 Hz to 4.75 MHz
≤ -3 dB, 5.75 MHz
≥ -24 dB, 6.75 MHz
≥ -40 dB, 8 MHz to 27 MHz
Group delay response
(reference at 500 kHz) ≤ ±20 ns, 10 Hz to 4.75 MHz
4) The video performance specifications are valid for a encoder - decoder pair using composite input and output.
Minimum bandwidth is 7 Mbit/s with 4:2:0 or 4:2:2 chrominance resolution.