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Entries found for search: channel

5.1-channel format &searchtxt A digital, discrete six channel mix of Left/Center/Right/Left surrond/Right Surround/ Subwoofer mix. 5.1 is not a specific surround format tied to any particular company or codec. However, all the hardware is the same for any 5.1-based system except for the codec. It is planned that CDs, laserdiscs, and DVDs will have an ID flag to let the decoder know which codec was used, enabling decoders to recognize all incoming bitstreams and automatically switch modes and process the incoming signal appropriately. It is a listening platform and hardware concept for a surround loudspeaker system. See DTS, Dolby Digital, HDTV, CDS, LFE.

basic channel : In a MIDI device, the channel on which the device receives fundamental messages governing its operation, e.g., Reception Mode changes. In Mono Mode, the basic channel is the lowest-numbered channel.

B-Channel : See ISDN.

channel : An independently processed or recorded signal. (1) An electrical signal path. In analog audio (such as a mixer), each channel consists of separate wired components. In the digital domain, channels may share wiring, kept separate through logical operations. (2) A system for independently addressing up to sixteen separate MIDI devices over a single MIDI cable. MIDI provides definitions for 16 channels which transmit not audio signals, but digital control signals for triggering synthesizers and other devices. MIDI data are associated with a particular channel by virtue of a Channel ID Number that is interwoven with other MIDI data being recorded. A track holds data that (depending on the sequencer) may or may not be restricted to one MIDI channel. MIDIís 16-channel limitation has been overcome by employing multiple independent MIDI ports that each route sixteen channels, offering the possibility of hundreds of channels. (3) The left or right signals of a stereo audio system, or the left, right, center, surround and/or subwoofer signals of a multichannel system, such as LCRS or 5.1. (4) In film, A complete, self-sufficient recording setup. A production channel would include a recorder, mixer, microphones, headsets, etc. A transfer channel would include a 1/4" tape deck, a 35mm mag recorder, a resolver, and a monitoring system.

channel assignment matrix : In a recording console, the group of buttons or switches by which the signal from any input channel can be assigned to one or more busses, and thereby be sent to one or more tracks of the multitrack recorder.

channel bit rate : The actual bits being read from a digital medium are greater than the number strictly required to encode the audio signal. This is because of ECC and synchronization bits, etc. For example, with a CD, the audio bit rate is 1.41Mbps, but the channel bit rate is actually three times as high, 4.32Mbps.

channel insert : An insertion point in a mixer channel which opens up the signal path and allows an outboard device to be inserted in-line. The output point (the place where the signal is routed to the outboard device) is called the channel insert send, and the place where the effected comes back into the mixer is called the channel insert return. The actual point at which the channel signal path is broken with the insert connection is not standard among all consoles. Some are between the preamp and equalizer sections, some after the equalizer, but before the fader, and some are post-fader. Some are switchable with an internal jumper or other modification. If, for example, the channel insert send is post-fader, the fader setting will affect the action of a compressor that is inserted into the channelís signal path. On the other hand, a post-fader insert is good when it is desirable to send a single channelís signal direct to a tape track, making the fader into a convenient record-level control. See normalled connection.

channel message : A class of MIDI messages which only affect devices on a MIDI network set to a particular channel, i.e., all non-system messages. Channel messages may be of either Channel Mode or Channel Voice type. See MIDI.

channel mode : See MIDI mode.

channel path : The record section of the signal chain in a mixer. See also monitor path.

channel pressure : A type of MIDI channel message that is applied equally to all of the notes on a given channel; the opposite of poly pressure, in which each MIDI note has its own pressure value. Also called aftertouch, channel pressure is generated on keyboard instruments by pressing down on a key or keys while they are resting on the keybed. Also called channel key pressure.

channel separation : Channel separation refers to the amount of crosstalk between the channels of a stereo system. It is the inverse of interchannel crosstalk, as measured in decibels. A small amount of crosstalk is equivalent to a large channel separation.

channel strip : One of multiple identical sections in a mixering console from the mic preamp and phantom power (if present) to the bus outputs, and typically includes the input pad, EQ, and signal routing, including pan, effect sends and effects returns, and main channel fader, and optionally an automation interface. There is one channel strip per mixer input.

Channel Voice : A classification of MIDI channel message relating specifically to a musical performance, where features of the performance (notes, articulation, etc.) are individually described by a unique message. Channel Voice messages include Note On, Note Off, Polyphonic Key Pressure, Channel Pressure, Program Change, Pitch-bend, and Controller Change. These messages all include a specific channel number, allowing similar messages to address different devices on the same MIDI network. The message will only be implemented by a receiving device whose channel number matches that of the message.

channelize : See MIDI mapping.

Shannonís channel capacity the :The formula, DRmax=W log 2 (1+sn) , where DR is data rate, W is channel bandwidth, and SN is the S/N ratio. It expresses the relationship between these three variables in digital audio.

multichannel : (1) In film, used to refer to a final mix that includes more than stereo information, i.e., LCRS or six-channel surround-sound formats. (2) In audio, any recording or playback system with at least two tracks.

Multichannel TV Sound (MTS) : A standard for transmitting stereo audio signals to home television sets.

six-channel mix : A nomenclature used for an audio-only surround-sound mix, more generally referred to as 5.1 which can refer to either audio-only or audio-for-video.

production channel : See channel.

ProLogic: A multichannel p 

surround channel : A single audio channel that feeds multiple speakers, either on the walls of a theater, or in a home surround system. In practice, any format which does not have spilt surrounds will be used for ambient sound only.

transfer channel : See channel.

voice channel : A signal path containing, (at a minimum,) an oscillator and a VCA, and capable of producing a note. On a typical synthesizer, two or more voice channels, each with its own waveform and parameter settings, can be combined to form a single note.

TCA Target Channel Adapter the IB component that connects an input/output device to other IB devices. TCAs only require support for capabilities appropriate to the particular input/output device. TCAs live inside of (on a backplane) or are attached to a device, such as a solid-state memory cache or device group, such as a tape library.

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