Burst Electronics DG-4 Digital Generator

Burst Electronics DG-4 Digital Generator

The DG4 is afull featured, multi-pattern, multi-format, SMPTE 259M (SD) and SMPTE 274M/296M(HD) SDI test pattern generator with 16-Channel voice ID’s and tones plusanalog genlock input and analog black-burst output. The pattern lineup wasspecifically chosen to expose system weakness and limitations. The movingzoneplate is used to qualify video compression and scaling. The pathologicalpattern is used to stress the PLL’s in the signal path. There is even thetraveling image which moves smoothly and randomly about the screen to revealdropped or repeated frames. Also included is a white flash video pattern withcoincident audio tone to measure the audio-to-video encoder delays.

The embeddedvoice channel ID repeats every 15 seconds, leaving no doubts or confusion aboutwhat audio channel is being monitored. In between the voice ID’s are standardlevel 1kHz audio tones for the “right” and 440Hz audio tones for the “left”within each group. The dwell is approximately 1 sec of voice and 14 seconds oftone. The inclusion of standard level tones permits very accurate systemleveling. The DG4 digital audio output level can be selected for the US -20dBFSor the European -18dBFS standard output level.

A genlockinput can force the output of the DG4 to match the genlock source frame ratesimplifying the format selection process. The DG4 also outputs an analog blackreference, tri-level for HD, bi-level for SD, in the selected format providingthe user the ability to generate a time adjustable reference signal.

The DG4 testpattern, format, and operational features are front panel selected using smartpushbuttons (function defined by mode) and displayed on an integrated 20×2 LCDdisplay.

Technical Specifications

Genlock Input:
Number: 1
Connectors:BNC
Standards:Tri-level sync, analog SMPTE 274M, 296M
Bi-level,analog NTSC (SMPTE 170M), PAL (ITU624-4)Level: 1v p-p
FrequencyLock Range: +/-75ppm from nominal
Impedance:Hi-z looping input
SDI Outputs:
Number: 5
Connectors:BNC
Standards:SMTPE 274M/296M/259M
Level: 800mvp-p
Impedance:75 ohm