Features - Sony BVT-2000 Operation And Maintenance Manual

1-1. FEATURES
Correction range of 4 Hp-p to 12 Hp·p
The memory built into the model can be used to .correct time base
errors up to a maximum of 4Hp-p in the VTR output. Moreover, by
combining it with the optional dynamic tracking memory circuit
board, time base errors up to 12 Hp-p (add ition of one memory
circuit board) can be corrected.
Also, if the above correction range is exceeded, the BVT-2000
output has no horizontal n;iovement (break-up) or sync fluctuations.
Wide range dynamic tracking playback
When combined with the model BVH-1100 VTR equipped with a
dynamic tracking mechanism, the model allows dynamic tracking
playback from one-fourt h the rated speed in the rewind direction to
twice the rated speed in the forward direction. (This form of
playback is also known as guard band noise-less playback.)
In this case, the optional dynamic tracking memory circuit board
is required .
Built-in 9 -bit analog-digital converter
The BVT-2000 processes the video signals by converting the analog
signals to the 9-bit digital signals. With this system, S/N deterioration
of the VTR playback signal which is caused by using the TBC can
practically be ignored.
Clock frequency four times the value of subcarrier frequency
The clock frequency required to convert the video signals into
digital data is selected to four times the subcarrier freq uency and so
a K factor of less than l % and a flat frequency response up to
4.2 MHz are obtained without taxing the signal processing fu nctions
in any way.
1 H prior d ropout compensation with digital Y /C separation
Thanks to the provision of a digital dropout compensator, the
dropout section can be replaced by a l H prior signal featuring a
high signal correlation.
Since 1 H prior dropout compensation displays a higher correlat ion
of the signals in the replaced section than 2 H prior dropo ut
compensation, the dropout compensation effect is greatly improved.
Furthermore, since digital Y /C separation is employed for the
dropout compensation, a high stability is yielded and there is no
need to adjust the gain or phase.
Synchronizes to external reference signals with high and low speed
tape playback
The BVT-2000 can synchronize the VTR output to external
reference signals and produce stable color while the tape is set to
the fast forward, re wind or slow motion/still playback if the tape is
traveling at not more than l 0 times faster or slower than the normal
tape speed.
Built-in velocity error compensation
The phase error is continuously compensated for within each line
due to tlie inclusion of the built-in velocity error compensator.
The BVT-2000 is also equipped with a unique high-speed auto-
matic phase control (APC) which, in company with the velocity
error compensator, helps to keep the residual phase errors down to
within ±2.5 nsecs for color signals.
Built-in sync generator
The built-in sync generator can be gen locked to external reference
video signals, or composite sync signals, subcarrier by setting the
switch to the proper position when required.
When the gen lock signa ls are not connected, sync is generated
automat ically by the internal source.
1-2
Picture improvement functions
As outlined below, the BVT-2000 features a number of picture
improvement functions.
• Cable compensation
The cable compensation circuit built into the input video circuit
enables
deteri~ration
to the freque ncy response caused by the
cable to be compensated.
• Differential gain compensation
Differential gain produced by the VTR can be linearly compen-
sated for across a range of ±8%.
• Differential phase compensation
Differential phase produced by the VTR can be linearly
compensated for across a range of ±8°.
• Chrominance noise reduction
By providing a line adding mode in the chroma system, the
signal-to-noise ratio in the chroma system can be improved.
Built-in video processor
The video level, chroma level, set up level, hue level, system
subcarrier phase and the system sync phase can all be adjusted with
the built-in video processor.
Shaping during the vertical blanking period
Unnecessary video signals in the vertical blanking period can be
selected at any line unit and replaced by pedestal potential.
Built-in automatic advanced sync generator
An automatic advanced sync generator is self-contained and this
automatically controls the advanced sync phase which is fed out to
the VTR so tha t the phase of the playback video signals is brought
to the center of the correction range while the BVH-1000 or BVU-
100 and BVU-200A is being employed.
This means tha t there is no need to align the advanced sync phase
when changing over tapes.
Attachable adapter for heterodyne color VTRs (option)
It is also possible to attach an adapter (BK-2003) which converts
playback signals from· a heterodyne color VTR without a subcarrier
input connector into standard broadcasting signals.