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Orban 8685 Surround
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The 8685 is Orban's second-generation surround/2.0 processor. In addition to the effective automatic loudness control of its predecessor, the 8685 offers new input/output capabilities that include support for SDI and HD-SDI and for Dolby E. Dual redundant power supplies help ensure maximum uptime. In addition to surround processing, the 8685 can simultaneously provide up to three channels of 2.0 processing, allowing it to provide all the audio processing necessary for a typical ATSC broadcast with multiple subchannels. Like the 8585, the 8685 is dialnorm-aware. Loudness control is excellent when measured by the ITU BS.1770 standard or by the 8685's built-in CBS Loudness Meters, allowing stations to comply effortlessly with the requirements of the CALM act.
Experience has shown that the mass television audience wants two things from television audio: dialog should be comfortably intelligible and commercials should not be irritatingly loud compared to program material. Home theater owners may want the opportunity to watch feature films while hearing a wide dynamic range signal. However, even these viewers usually consume television in a much more passive way when viewing garden-variety programs. To be an acceptable part of the domestic environment, television sound cannot overwhelm household members not interested in viewing (not to mention neighbors, particularly in multi-family dwellings). For a variety of reasons, the dynamic range of sound essential to the intelligibility of the program should not exceed 15 dB in a domestic listening environment. Underscoring and ambient sound effects will, of course, be lower than this.
Differences between the 8585 and 8685:
- Up to three full-featured 2.0 processors that can run simultaneously with the surround (up to 7.1-channel) processing. (The 8585 offers one such 2.0 processor.) Each 2.0 processor has a loudness controller and loudness meter. A single 8685 can provide processing and loudness control for up to three stereo ATSC SD subchannels with stereo audio and one surround ATSC HD subchannel. (The number of usable 2.0 processors depends on the I/O configuration; only the optional HD-SDI I/O can accommodate the number of inputs and outputs necessary to feed the three 2.0 processors and the surround processor simultaneously.)
- Optional SDI input and output interface that supports SD-SDI (per SMPTE 259M); 1.5 Gbit/s HD-SDI (per SMPTE 292M; up to 720p and 1080i) and 3.0 Gbit/s single-wire HD-SDI (per SMPTE 424M; 1080p). A relay provides hard-wire safety bypass from the SDI input to the SDI output in case of hardware failure. The SDI I/O includes three AES3id inputs and three AES3id outputs, which can be used as a loop-through for Orban's Penteo® 2.0->5.1 upmixer or to provide I/O for up to three channels of 2.0 processing. The SDI I/O option provides up to 11 frames of video delay to match the delay of the 8685's loudness processing, optional Penteo 2.0->5.1 upmixer, and optional Dolby-E encode and decode. Dolby E encode and decode requires the optional SDI I/O interface.
- An expanded routing switcher that offers versatile, programmable, remote-controllable routing of the various inputs and outputs added by the SDI interface.
- Dual-redundant, automatically switched, high-efficiency power supplies with separate AC line inputs.
Features:
- The 8685 includes third-generation CBS Loudness Controllers™ for DTV applications
- Precise control of peak levels
- Pre-emphasis limiting for the two standard pre-emphasis curves of 50 µs & 75 µs
- Color LCD and large rotary knob
- Two processors in one
- Stereo analog monitor output
- Stereo headphone jack
- RS485 ports for Dolby Digital Metadata I/O
- Sync Input
- "Protect" function
- Phase-linear processing structures
- Remote software
- Bypass Test Mode
