Digital Processing Systems DPS-295
1×Composite (CVBS) (BNC)
1×Y/C DUB color-under (Hirose 7-pin DUB)
1×Component (YPbPr) (BNC)
Description
The Digital Processing Systems DPS-295 is an infinite window multi-format transcoding TBC designed for cable, broadcast, and post-production facilities. It eliminates timebase error while providing a single platform capable of interfacing various composite and component video standards including NTSC, SVHS, Y/C-688, Y/C-629, and CAV (MII or Betacam).
The DPS-295 features advanced digital circuitry including chroma noise reduction, chroma edge enhancement, automatic adaptive 3D dropout compensation, and an adaptive comb filter. The adaptive comb filter maintains full 6.0 MHz luminance bandwidth for transcoding and processing in all modes.
A built-in 48-pattern component test signal generator provides a complete set of true multi-format component test signals including SMPTE bars, EIA bars, multiburst, pulse and bar, convergence grid, ramps, and various measurement patterns.
Digital effects include posterization, black stretch, sepia, and solarization, each with 16 levels of adjustment. Freeze modes include frame, field (with selection of 1-3 captured fields), and variable strobe.
An optional waveform monitor board enables digitally synthesized waveform, vector, and component parade displays, with the ability to download digitized video data to a PC for automated signal measurement or multimedia integration.
The unit is housed in a 1U rackmount enclosure and provides comprehensive remote control options via RS-422 ES-buss or RS-232 serial interfaces, plus a GPI input for remote freeze triggering.
Photos
Specifications
Video Processing
| Parameter | SVHS/DUB Input | NTSC Input |
|---|---|---|
| Sampling | 8-bit, 14.318 MHz, Component | 8-bit, 14.318 MHz, Component |
| Frequency Response | ±0.25 dB (FCC Multi-burst), 6 MHz (-3 dB) | ±0.5 dB (FCC Multi-burst), 6 MHz (-3 dB) |
| Differential Phase | <1° | <2° |
| Differential Gain | <1% | <2% |
| K-Factor | <0.5% | <1% |
| S/N Luma (weighted) | >58 dB | >58 dB |
| Synchronizing Range | — | Infinite |
| Residual Timebase Error | — | <15 ns |
Test Signal Generator
| Parameter | Specification |
|---|---|
| Frequency Response | ±0.1 dB (FCC Multi-burst) |
| Differential Phase | <0.25° |
| Differential Gain | <0.25% |
| Luma Non-linearity | <1% (5-Step) |
| Chroma Non-linearity | <0.25%, <1° (NTC-7) |
| Y/C Delay | <5 ns |
| K-Factor (2T) | <0.25% |
| S/N Luma (weighted) | >70 dB |
Proc Amp Controls
| Control | Range |
|---|---|
| Luminance Gain | +6 to -40 dB |
| Set-up (Black Level) | ±20 IRE |
| Chroma Gain | +6 to -40 dB |
| Hue | ±60° |
| Y/C Delay Horizontal | ±1 µs |
| Y/C Delay Vertical | +1 to -2 lines |
| System Phase | ±17 µs |
Effects
| Effect | Range |
|---|---|
| Posterization | 16 levels |
| Black Stretch | 16 levels |
| Solarization | 16 levels |
| Sepia | 16 levels |
| Strobe | 0-100 frames |
Physical
| Parameter | Specification |
|---|---|
| Dimensions (W × H × D) | 17" × 1.75" × 20" (43.2 × 4.4 × 50.8 cm) |
| Rack Height | 1U |
| Operating Temperature | 0-40°C |
| Spec Temperature | 10-40°C |
| Storage Temperature | -40 to 75°C |
Inputs
| Connector | Signal | Level |
|---|---|---|
| NTSC-1 (BNC) | Composite NTSC | 1V p-p, 75Ω terminated |
| NTSC-2/DUB-C (BNC) | Composite NTSC or DUB chroma | 1V p-p, 75Ω terminated |
| SVHS (4-pin Mini-DIN) | Y/C-3.58 | Y: 1V p-p, 75Ω; C: 286mV burst, 75Ω |
| DUB-Y (7-pin) | Luminance | 1V p-p, 75Ω |
| Ref. Video (BNC) | Color black | 1V, Hi-Z loop-through |
Outputs
| Connector | Signal | Level |
|---|---|---|
| NTSC-1 (BNC) | Composite NTSC | 1V p-p, 75Ω |
| NTSC-2 (BNC) | Composite NTSC | 1V p-p, 75Ω |
| SVHS (4-pin Mini-DIN) | Y/C-3.58 | Y: 1V p-p, 75Ω; C: 286mV burst, 75Ω |
| DUB (7-pin) | Y/C-688 | Y: 1V p-p, 75Ω; C: 688 kHz, 230mV burst, 75Ω |
| CAV Y (BNC) | Component Y | Betacam: 714mV; MII: 700mV |
| CAV R-Y (BNC) | Component R-Y | Betacam: 700mV (75% bars); MII: 486mV (75% bars) |
| CAV B-Y (BNC) | Component B-Y | Betacam: 700mV (75% bars); MII: 486mV (75% bars) |
| Subcarrier (BNC) | 3.58 MHz feedback | 2V p-p, 75Ω |
| Advanced Sync (BNC) | Composite sync, 32 lines early | 4V p-p, 75Ω |
| RGB (optional) | RGB with sync | 714mV RGB with 286mV sync |
Test Signal Generator Patterns
The built-in test signal generator provides 48 patterns:
| # | Pattern | # | Pattern |
|---|---|---|---|
| 0 | SMPTE Bars | 24 | Modulated Ramp |
| 1 | EIA Bars | 25 | Demodulator Alignment Multi Ramp |
| 2 | Full Field Bars | 26 | FCC Composite |
| 3 | Bars/Luma Bars | 27 | NTC-7 Combination |
| 4 | Bars/Red | 28 | Multi-Pulse |
| 5 | Bars/Reverse Bars | 29 | Sin(X)/X |
| 6 | Bars/Timing (20T modulated pulses) | 30 | Timing Bowtie (±50, ±100...±250 ns markers) |
| 7 | Luma Bars | 31 | Matrix-1: Pulse & Bar, Bars, Modulated Ramp |
| 8 | Multi-Burst 60 IRE (0.5/1/2/3/3.58/4.2 MHz) | 32 | Matrix-2: FCC Composite, Bars, NTC-7 |
| 9 | FCC Multi-Burst 100 IRE | 33-40 | Bounce 10/90 |
| 10 | Luma Line Sweep (0-5.5 MHz with markers) | 41-48 | Bounce 0/100 |
| 11 | Chroma Sweep (0-1.0 MHz with markers) | ||
| 12 | Pulse & Bar with Window | ||
| 13 | Convergence Grid | ||
| 14 | Super Black (0 IRE) | ||
| 15 | Black (7.5 IRE) | ||
| 16 | Gray (50 IRE) | ||
| 17 | White (100 IRE) | ||
| 18 | Red Field | ||
| 19 | Luma 5-Step | ||
| 20 | Modulated 5-Step | ||
| 21 | Luma 10-Step | ||
| 22 | Modulated 10-Step | ||
| 23 | Luma Ramp (0-100 IRE) |
Input Modes
The DPS-295 supports three input processing modes:
- HET (Heterodyne) — Used for all TBC applications when the subcarrier feedback is not used. Also suitable for synchronizer applications.
- DIRECT — Used only in TBC applications when the subcarrier feedback from the DPS-295 is connected to the playback VTR.
- SYNC — Used for synchronizer applications when the signal being processed does not require timebase correction. Provides better stability and Y/C separation with noisy signals.
Remote Control
The DPS-295 supports three remote control methods:
- GPI — Contact closure or TTL input for freeze toggle
- RS-232 — 9600 bps, 8N1, for PC-based control
- RS-422 ES-buss — 38.4 kbps with even parity, for broadcast automation systems
The remote port uses a 9-pin D-sub connector with jumper-selectable RS-232 or RS-422 electrical interface.
Options
- Waveform Monitor Board — Provides digitally synthesized waveform, vector, and component parade displays. Supports video data download to PC via serial port for automated measurement.
- RGB Output Board — Adds RGB output capability (714mV RGB with 286mV sync) in addition to Y/R-Y/B-Y component outputs. Supports RGB-S (4-wire) applications via advanced sync output.
See Also
- Digital Processing Systems
- Digital Processing Systems DPS-290
- Time base correctors and frame synchronizers
