Dolby Cat. No. 778 Digital Input/Output Card is an expansion card for the Dolby CP650 cinema processor, which adds digital audio input and output capabilities, making it particularly appropriate for studio applications requiring digital throughput. It also provides Dolby Digital Surround EXTM decoding, and decodes Dolby Digital bitstreams from non-film sources such as DVDs, Digital Video Recorders, digital cinema servers, and digital television broadcasts. When installed in a CP650 with version 2.2 or newer software, the Cat. No. 778 also provides Unity Gain and Noise Floor Optimization features. Unity Gain maintains the original level of digital signals as they pass through the CP650, while Noise Floor Optimization maximizes each channel's headroom based on its B-chain settings to provide the lowest possible noise floor within the CP650. Once the Cat. No. 778 has been installed, its digital inputs and outputs are accessed via the Option Card I/O 25-pin female D-connector on the CP650's rear panel. Note: Installation of the Cat. No. 778 automatically disables the CP650's analog outputs.
The Dolby Cat. No. 778 adds digital audio input and output capabilities to the Dolby CP650 cinema processor, supporting AES/EBU connections, Dolby Digital Surround EX decoding, and various playback formats. It also provides Unity Gain and Noise Floor Optimization when used with CP650 version 2.2 or newer.
Installation is performed via the Option Card I/O 25‑pin female D‑connector on the CP650 rear panel; once installed, the card’s digital inputs and outputs become available and the CP650’s analog outputs are automatically disabled. The manual includes detailed specifications, channel designations, synchronization requirements, and warranty information.
| Digital Audio Coding | 16-, 20-, and 24-bit PCM, 44.1 to 48 kHz |
|---|---|
| Digital Audio Inputs | 4 × AES/EBU, balanced (up to eight channels) |
| Input Impedance | 110Ω |
| Digital Audio Outputs | 5 × AES/EBU, balanced (up to ten channels) |
| Output Impedance | 110Ω |
| Synchronization Requirement | First digital input pair (L/R) sync; others must be phase‑ and sample‑synchronous |
Installation of the Cat. No. 778 automatically disables the CP650's analog outputs.
The system synchronizes to the first digital input pair (L/R); other digital inputs must be phase‑ and sample‑synchronous.
Dolby warrants the equipment against defects in materials and workmanship for one year from the date of purchase.