Dolby Laboratories Spectral Processor 740 Brochure

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The Dolby 740 is a two-channel, dynamics-based processor for emphasizing low-level

sonic details in audio programming.

Whether bringing out the subtleties in all aspects of recording,

mastering, postproduction, and live performance, or lending

character to audio broadcasts, the Dolby

provides a high level of flexibility in audio processing. Based on

the versatile filtering characteristics of Dolby SR noise reduction,

this two-channel dynamic processor allows boosting of low-level

signals while leaving high-level signals untouched. Like a

magnifying glass for sonic details, the Spectral Processor allows

you to tailor your sound like never before.

The Dolby 740 processes low-level signals in a side chain, where

as much as 20 dB of boost can be added in low-, mid-, and high-

frequency bands. The side chain's signal is then added to the

original input signal, resulting in an output with the low-level

details boosted, while the high-level signals remain unaffected.

For maximum effectiveness, the threshold below which the

processing occurs, the amount of boost in each band, and

the crossovers between bands are all user-adjustable. A gentle

sliding-band noise reduction circuit providing up to 12 dB of

action is also included, to reduce any source noise that the

low-level equalization process might have emphasized. Other

controls include a stereo link switch and adjustable output level.

The user adjustments described above make it possible to

emphasize ambience, lift harmonics, and bring out otherwise

740 Spectral Processor

inaccessible details—all without compressing or limiting

transients, increasing overall level, or disturbing the overall

sense of dynamics.

User adjustments for selectively boosting low-level signals allow

broadcasters to tailor the sound for their station, whatever the

format. It conveys all the detail of the original source material

while eliminating the over-processed sound that can fatigue

listeners. When used in conjunction with a conventional

compressor/limiter, the Spectral Processor adds greater

punch, presence, clarity, and loudness to broadcast signals.

740

Spectral Processor