VooDoo DCR 6000, Planning & Installation Manual

Page: 33 / 149

1. General DCR 6024/6128/6000
1 – 24 Planning and Installation – Rev. 1 / 7. 2001
The following low pass filter BX 5111 cuts noise above 80 MHz. To have a constant
output level for the quantized feedback circuit, the level is regulated by an AGC (Au-
tomatic Gain Control Circuit).
BY 5165 Clock Recovery
The clock recovery is a PLL circuit which regenerates the clock signal, to be used
to clock the data. The VCO is tuned via I
2
C-bus for various Standards and data
rates in the operation modes play, shuttle, variable. After clocking the data signal
is digital in time and level and is parallelized into 2 bits which are fed to output buffer
of the active terminal board BY 5121.
BX 5121 Active Terminal Board
The active terminal board contains ECL buffers for the playback clock and data sig-
nal.
Record
From all of the reproduced digital audio data and the aux input data, cue record sig-
nal is generated and transmitted to the Tapedeck.
The signal, transmitted in a digital form to the cue control analog board BY 5115,
is converted back to an analog signal to be recorded on tape. Before recording level
and frequency response are aligned and bias is added.
Play
The cue playback signal passes through a level control and equalizer stage before
it is converted back to a digital form on the cue control analog board and transmitted
to the Processor.
The time code signal, generated in the system control unit BY 5160, is recorded
on tape after adding bias on the board cue control analog BY 5115.
The playback signal is fed via the board cue control analog BY 5115 to the wave-
form monitor stage of the board scanner power supply BY 5112 and after clipping
to the system control board BY 5160.
During record, a signal derived from the record current is fed to the waveform moni-
tor stage.
The control track signal, generated in the system control unit BY 5160, is recorded
on tape after adding bias on the board cue control analog BY 5115.
The playback signal is fed via BY 5115 board to to the waveform monitor stage
of the board scanner power supply BY 5112 and after clipping to the system control
unit BY 5160.
During record, a signal derived from the record current is fed to the waveform moni-
tor stage.
The main erase stage is located on the cue control analog board BY 5115 and is
active during crash and assemble record mode to erase the complete tape.
Cue Audio
Timecode
Control Track
Main Erase