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7837CD2, 7837CD2-A4, 7837CD2-A8

Dual Composite Decoder

Product ManualManual
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The 7837CD2 line of composite analog to serial digital video converters are dual broadcast quality video decoders. The 7837CD2-A4 and the 7837CD2-A8 versions offer four (two per decoded channel) or eight (four per decoded channel) high quality analog audio A/D converters. Advanced 3D adaptive comb filtering technology is utilized to eliminate moving artifacts introduced during the decoding process. This makes the 7837CD2 series ideal for use in applications where the signal is destined to enter compression systems. The 7837CD2 series utilizes 12 bit video ADCs for superior precision and image quality.

The 7837CD2 series is fully SNMP enabled when used in conjunction with a 7700FC frame controller card. With full SNMP capabilities, the 7837CD2 series can also be controlled by any SNMP enabled Evertz control panel like the CP-2232E, amongst others. In addition to SNMP control, the 7837CD2 series can be controlled locally used its internal On-Screen-Display capabilities.

Features
  • One input BNC per channel
  • 75Ω or Hi-Z input impedance (jumper configurable)
  • Two SD-SDI outputs per per channel without OSD text
  • One composite analog video output with OSD text for card control
  • One composite analog reference input (NTSC or PAL-B) on BNC with 75Ω or Hi-Z input impedance (jumper configurable). One time base for both channels
  • Video frame synchronizer
  • Infinitely variable output phase (27MHz clock increments)
  • Freeze modes: black, freeze
  • Comprehensive on screen display for module config
  • The Features of the Decoding Process
  • 12 bit sampling of input analog video
  • Advanced 3D adaptive video decoding
  • Mode for support of non-time base corrected signals
  • User configurable luma detail enhancement
  • User selectable noise reduction
  • Chroma AGC available, if desired
  • User adjustable input video processing functions: black level, gain, hue, and saturation
  • The Features of "-A4" and “-A8” Option
  • 4 balanced analog audio inputs (two stereo pair) on 7837CD2-A4
  • 8 balanced analog audio inputs (four stereo pair) on 7837CD2-A8
  • High impedance inputs (user supplies termination resistors for other impedances)
  • Analog audio levels are software selectable (separate controls for coarse/fine)
  • Audio delay tracks video delay
  • Additional audio delay up to 2.5 seconds
  • Audio advance of up to 1 frame
  • 2 channels (1/2 group) of audio is multiplexed onto each of the outgoing digital video signals (7837CD2-A4)
  • 4 channels (one full group) of audio is multiplexed onto each of the outgoing digital video signals (7837CD2-A8)
  • 2 unbalanced AES audio outputs using BNC connectors (7837CD2-A4)
  • 4 unbalanced AES audio outputs using BNC connectors (7837CD2-A8)
Block DiagramBlock Diagram

Specifications

Analog Video Input
StandardNTSC, SMPTE ST 170 PAL, ITU624-4
Number of Inputs1 per channel
ConnectorBNC per IEC 61169-8 Annex A
Signal Level1V nominal
Frequency Lock Range±50 ppm from nominal
Input Level Control Range> ±4dB
Black Level Control Range> ±5IRE
Chroma Level Control Range> ±20%
Hue Control Range±20° (NTSC only)
Input Impedance75Ω or High impedance (jumper selectable)
Return Loss> 35dB to 5MHz
Reference Video Input
StandardNTSC, SMPTE ST 170 PAL, ITU624-4
Number of Inputs1
ConnectorBNC per IEC 61169-8 Annex A
Signal Level1V nominal
Frequency Lock Range±50 ppm from nominal
Input Impedance75Ω or High impedance (jumper selectable)
Return Loss> 35dB to 5MHz
Analog Monitoring Video Output
StandardNTSC, SMPTE ST 170 PAL, ITU624-4
Number of Outputs1
ConnectorBNC per IEC 61169-8 Annex A
Signal Level1V nominal
Output Impedance75Ω
Return Loss> 35dB to 5MHz
Serial Video Output
StandardSMPTE ST 259-C - 525 or 625 line.
Number of Outputs4 (2 per channel)
ConnectorBNC per IEC 61169-8 Annex A
Signal Level800mV nominal
DC Offset0V ±0.5V
Rise and Fall Time900ps nominal
Overshoot< 10% of amplitude
Return Loss> 15dB to 270MHz
Jitter< 0.20UI (all outputs)
Embedded AudioSMPTE ST 272-A
Decoder PerformanceSDI outputs only
Frequency Response< ±0.1dB (100kHz to 4.2MHz)
Differential Gain< ±0.5% typical
Differential Phase< ±0.5° typical
Noise Floor< -60dB rms (black video VBI lines, 15kHz to 5MHz)
C/L Gain< ±0.5%
C/L Delay< ±9ns
Minimum Delay4.5 lines
Maximum Delay1 frame +4.5 lines
Inter-channel crosstalkWithin noise floor measurement
Analog Audio Input-A4 and -A8 only
Number of Inputs
7837CD2-A44 (2 per video channel)
7837CD2-A88 (4 per video channel)
TypeBalanced analog audio
Input Impedance20kΩ minimum (differential)
Sampling Frequency48kHz
Signal Level0dB FS => 18 or 24dBu (Software selectable)
Level Control Range±10dB
Frequency Response±0.1dB (20Hz to 20kHz) (broadcast quality)
SNR100 dB
THD+N< 0.001% (> 100dB) @ 1kHz, -0.5 dB FS
< 0.001% (> 100dB) @ 20Hz to 20kHz, -0.5 dB FS (input video locked to genlock video)
CMRR> 90dB @ 1kHz
AES Audio Outputs
Number of Outputs
7837CD2-A42 (1 per channel)
7837CD2-A84 (2 per channel)
Output StandardSMPTE ST 276, single ended synchronous AES
ConnectorsBNC per IEC 61169-8 Annex A
Resolution24 bits
Sampling Ratesynchronous 48kHz
Minimum I/O Delay2.9ms
Maximum I/O Delay2.5s
Electrical
Voltage+12V DC
Power
7837CD217 Watts
7837CD2-A421 Watt
7837CD2-A821 Watts
EMI/RFIComplies with FCC Part 15, Class A
EU EMC directive
Physical
Number of Slots
7700FR-C2 (7837CD2) or 3 (7837CD2-A4/A8)
7800FR1 (7837CD2) or 2 (7837CD2-A4/A8)

Ordering Information

7837CD2Dual Composite Decoder
7837CD2-A4Dual Composite Decoder with 4 analog inputs
7837CD2-A8Dual Composite Decoder with 8 analog inputs
Ordering Options
NotesRear plate must be specified at time of order - eg: [model]+3RU
Rear Plate Suffix
+3RU3RU rear plate for use with 7700FR-C, 7800FR, 7800FR-QT or 7801FR Multiframes
Enclosures
7700FR-C3RU Multiframe which holds 15 single slot modules
7800FR3RU Multiframe which holds 15 single slot modules
7800FR-QT3RU Quiet Multiframe which holds 15 single slot modules
7801FR1RU Multiframe which holds 4 single slot modules