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5.1
Five full-range channels plus the LFE channel.
6.1
Six full-range channels plus the LFE channel.
7.1
Seven full-range channels plus the LFE channel.
Acoustics
The characteristics, such as how sound is reflected and absorbed, that give a space such as a living
room, concert hall, or cinema an identifiable sonic "signature."
ADR
ADR (automated dialogue replacement or additional dialogue recording) is a film sound technique involving the rerecording of dialogue after the original film shoot. This process can be used when the original sound was unusable due to background noise on the set such as traffic, or to replace the singing of actors with that of professional singers.
AIM
Ascend Inverse Multiplexing. Ascend Communication's proprietary inverse multiplexing method. Bonding
is currently preferred (see below).
Ambience
Low-level sounds (including sound reflections) that set a mood or suggest the character of a
particular place.
Analog vs. digital soundtrack
The width of an analog soundtrack varies in a way that is directly analogous to the varying soundwaves
of the original sound. When played back, the varying width of the track is translated to a varying
electrical voltage which ultimately causes the theatre's loudspeaker cones to move back and forth to
recreate the original sound. With a digital soundtrack, points along the soundwaves of the original
sound are assigned a numeric (or digital) value, consisting of ones and zeroes represented as tiny
dots on the track. When a digital track is played back, the numeric values are converted to the
varying electrical voltage needed to drive the speakers. (See Optical soundtrack.)
Atmospheres
Low level background sounds, such as wind or traffic noise, on a film's soundtrack which add to
the reality of a scene. These sounds are sometimes recorded separately at a shooting location,
creating what is called a wild track for mixing into the soundtrack later.
Basic Rate Interface (BRI)
An ISDN interface that provides two 64 kbps digital B (Bearer) channels for voice or data and
one 16 kbps signaling D (Delta) channel.
Bonding
Bandwidth ON Demand INteroperability Group, which is an industry inverse multiplexing standard for
dialing, establishing, maintaining, and terminating N x 56 and N x 64 kbps calls.
Center Speaker
Firmly anchors the dialogue to the image. Reproduces nearly all of the dialogue and an estimated
70% of all movie sound.
Channel
In communications, any pathway between two devices (e.g. computers, multiplexers). The channel may
refer to the physical medium (e.g. coaxial cable) or to a specific carrier frequency (subchannel)
within a larger channel. Within the ISDN BRI format there are two B channels.
Channel
An independently processed or recorded audio signal.
CPE
Customer Premises Equipment. This equipment is owned by the customer, and includes items such as
an audio codec, TA and NT-1. The RBOC does not typically assume any responsibility for this
equipment.
CSU (Channel Service Unit)
A device that interfaces between a communications network and data terminal equipment.
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