User Manual

Room

The Room algorithm was introduced in the PCM96 and is one of the most ﬂexible algorithms

we’ve ever invented. Reﬂection patterns can be easily selected, scaled and equalized all while

simultaneously passing audio, and the room size can be instantly changed or reversed. It is

similar to other Lexicon

reverbs in that it is used to create the illusion of space. However it

differs in important ways. A room is comprised of a selectable early impulse taken from actual

room measurements. There are several categories of responses, including small rooms, large

rooms and odd rooms (impulses from unconventional sources). There are parameters to allow

adjustments to this response, including scaling and reversing the response. In many cases this

is sufﬁcient.

There are three primary applications for the Room algorithm:

• Post Production - Lexicon

reverbs are renowned for smooth tails and controlled frequen-

cy response. However, in many cases the earlier components are more important. This

may be true for some forms of popular music and is even more true for post-production.

In these cases, speciﬁc types of spaces need to be invoked for convincing dialog and

effects.

• Reverbs – This algorithm can also be used to generate large reverberant spaces that

have a very different character from the more traditional Lexicon reverbs. These reverbs

provide a high-quality counterpoint to the original “Lexicon Sound”. There are a number

of presets which take advantage of this.

• Effects – Because room patterns can be reversed, there are many additional sounds avail-

able, such as backwards reverb and gated sounds.

The Room algorithm provides the inherent realism of the actual space with all the precise

control and manipulation that is only possible with a reverb synthesizer.



NOTE: Though the term “impulse” is used in this manual, these algorithms are NOT

convolution reverbs!