2×Analog stereo (Phoenix connector, Stereo audio)
2×Analog stereo (Phoenix connector)
Description
The Leitch DPS-475 is a broadcast-quality digital processing synchronizer designed for NTSC-only operation. Originally developed by Digital Processing Systems (DPS) and continued under the Leitch brand following the 2000 acquisition, the DPS-475 is hardware identical to its multi-standard sibling, the DPS-575, but is software-locked to operate only with NTSC signals.
The unit combines frame synchronization, time base correction, format transcoding, and audio/video processing in a single 1U rackmount chassis. It serves as a universal bridge between analog and digital video systems, accepting composite, S-Video, component analog, SDI, and optionally DV (IEEE-1394) inputs while providing simultaneous outputs in all formats.
A key innovation is the DigiDuplex mode, which enables bi-directional connectivity between analog tape machines and digital routing systems. This allows the SDI input to feed analog outputs (for recording to an analog VTR) while simultaneously accepting the VTR's analog output, processing it, and outputting via SDI—all in a single unit.
The DPS-475 employs a 12-bit adaptive 3-dimensional comb filter decoder featuring DPS's proprietary Phase Quadrature Mixing (PQM) technology, which virtually eliminates cross-luminance and cross-chrominance artifacts from composite sources. The integrated framestore supports still image storage with linear keying, enabling logo insertion and source identification.
Available in video-only (DPS-475) and audio/video (DPS-475AV) configurations, as well as "LC" variants without front panel controls for remote-operated installations.
Photos
Relationship to DPS-575
The DPS-475 is hardware identical to the DPS-575. The only difference is a software lock that restricts the DPS-475 to NTSC operation, whereas the DPS-575 supports auto-sensing dual-standard PAL/NTSC operation.
According to discussions in the laserdisc community, it is reportedly possible to convert a DPS-475 to a DPS-575 via firmware flashing, effectively unlocking PAL support. This involves uploading DPS-575 firmware to the unit. See this LDDB forum thread for details.
Specifications
Video Processing
| Parameter | Specification |
|---|---|
| ADC/DAC Resolution | 12-bit |
| Component Pipeline | 10-bit YUV |
| Synchronizing Range | Infinite |
| Frequency Response (Sync Mode) | ±0.25 dB (0–5.5 MHz), -1 dB (5.5–5.75 MHz) |
| Frequency Response (TBC Mode) | -3 dB (0–4.2 MHz, notch at 3.58 MHz) |
| Signal-to-Noise (TSG/SDI) | >75 dB luminance weighted |
| Signal-to-Noise (Sync Mode) | >70 dB luminance weighted |
| Signal-to-Noise (TBC Mode) | >60 dB luminance weighted |
| Differential Phase | <1° (modulated ramp) |
| Differential Gain | <1% (modulated ramp) |
| K-Factor (2T) | <0.5% |
| Luminance Jitter (TBC Mode) | <15 ns |
Video Inputs
| Input | Specification |
|---|---|
| Composite Video (BNC) | 1V p-p, 75Ω |
| Component Y (BNC) | 1V p-p, 75Ω |
| Component R-Y/B-Y (BNC) | 0.7V p-p, 75Ω |
| S-Video Y (Mini-DIN-4) | 1V p-p, 75Ω |
| S-Video C (Mini-DIN-4) | 286 mV burst (NTSC) |
| SDI (BNC) | 75Ω, auto EQ to 300m, reclocked/buffered loop output |
| DV (6-pin Molex, optional) | IEEE-1394 |
| Genlock Reference (BNC loop) | 1V p-p, 75Ω |
Video Outputs
| Output | Specification |
|---|---|
| Composite Video (BNC ×2) | 1V p-p, 75Ω |
| Component Y (BNC) | 1V p-p, 75Ω |
| Component R-Y/B-Y (BNC) | 0.7V p-p, 75Ω |
| S-Video Y (Mini-DIN-4) | 1V p-p, 75Ω |
| S-Video C (Mini-DIN-4) | 286 mV burst (NTSC) |
| RGB (BNC) | 1V p-p, 75Ω |
| RGBS Sync (BNC) | 300 mV or 8V p-p (selectable) |
| SDI (BNC ×2) | 75Ω |
| DV (6-pin Molex, optional) | IEEE-1394 |
Proc Amp Controls
| Control | Range |
|---|---|
| Video Level | ±3 dB |
| Setup Level | ±20 IRE |
| Chroma Level | ±6 dB |
| Hue Phase | ±45° |
| Horizontal Genlock Timing | ±6 µs |
| Subcarrier Genlock Timing | 360° |
| Input Y/C Delay | -592 ns to +518 ns |
Audio Specifications (DPS-475AV)
| Parameter | Specification |
|---|---|
| Processing Resolution | 24-bit |
| Analog Input Sampling Rate | 32, 44.1, 48 kHz |
| Maximum Analog Level | +24 dBu |
| Analog Input Impedance | 600Ω or 18kΩ |
| Operating Levels | +8, +4, 0, -4, -10 dBu |
| AES/EBU Resolution | 24-bit, up to 96 kHz |
| SDI Embedded Resolution | 20-bit, 48 kHz synchronous |
General
| Parameter | Specification |
|---|---|
| Dimensions (W × H × D) | 17" × 1.75" × 20" (43.2 × 4.4 × 50.8 cm) |
| Rack Height | 1U |
| Power | 70W, 100–240 VAC, 50/60 Hz |
| Remote Control | RS-232/RS-422 (DB-9F), Ethernet 10Base-T (RJ-45), DCN (BNC) |
| GPI | 2× input (on breakout cable), 1× output (on breakout cable) |
Model Variants
| Model | Description |
|---|---|
| DPS-475 | Video-only synchronizer (NTSC only) |
| DPS-475AV | Integrated audio/video synchronizer (NTSC only) |
| DPS-475LC | Video-only without front panel controls |
| DPS-475LCAV | Audio/video without front panel controls |
Options
| Part Number | Description |
|---|---|
| AS-575 | Four-channel digital audio synchronizer module (upgrades DPS-475 to DPS-475AV) |
| AS-575L | Audio synchronizer module with audio limiter |
| ASL-575 | Audio limiter option (requires existing AS-575) |
| NR-575 | Digital noise reduction and bandwidth filter |
| AL-475 | Animated logo option (NTSC) |
| DVM-5010 | DV I/O module (IEEE-1394) |
| RC-475 | Multi-channel remote panel |
| RC-4000 | Multi-channel remote panel with Ethernet |
| 774-753 | Video breakout cable |
| 774-755 | Audio breakout cable |
Test Signals
The DPS-475 includes over 30 built-in 10-bit test patterns for NTSC:
- SMPTE Bars
- EIA Bars
- Full Field Bars
- Bars / Luma
- Bars / Reverse
- Bars / Red
- Bars 100%
- Super Black
(Plus additional multiburst, pulse & bar, and specialized test patterns)
Remote Control
The DPS-475 supports multiple remote control methods:
- Serial — RS-232 or RS-422 via DB-9F connector at 9600 or 38400 bps
- Ethernet — 10Base-T for LAN/WAN control via web browser or Leitch PILOT GUI software
- DCN — Proprietary DPS serial control network (BNC)
- GPI — Two TTL/contact closure inputs and one TTL pulse output (via breakout cable)
Multiple DPS-475 units can be networked and controlled from a central location using the optional RC-475 or RC-4000 remote panels.
Documents
See Also
- Leitch DPS-575 — Multi-standard (PAL/NTSC) version
- Digital Processing Systems
- Digital Processing Systems DPS-290
- Leitch
