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Entries found for search: head

Aachen Head : A binaural microphone developed by Head Acoustics.

erase head : The head on a tape recorder that erases magnetic information on the tape, located just before the record head in the tape path. A high-level, high-frequency (150-300kHz) tone, called an erase frequency which, when fed through the erase head, re-randomizes the orientation of the tape’s magnetic domains so that the signal to be recorded will have no hysteresis. See erase oscillator.

head : (1) On a tape recorder, an electro-magnetic transducer that (i) converts electrical energy in the signal into a magnetic field that induces magnetization in the tape, or (ii) produces an electrical signal in response to the varying remanent magnetism stored along a passing length of tape. See erase head, playback head, record head, sync head. (2) In general, the transducing mechanism used in recording or playing back signals on various media, e.g., the cutting head of a record mastering lathe, the optical head of a motion picture projector, etc.

head gap : See gap.

head losses : Limitations in the frequency response of the signal a tape head can transfer to or read from tape due to its inherent design or construction.

headphone box : See cue box.

headphone mix : See cue mix.

headroom : The amount of additional signal above the nominal input level that can be sent into a module before clipping distortion occurs. On a digital tape, input levels are set very low, -15VU to -12VU, to allow adequate headroom for occasional input peaks that might exceed -12VU. See dynamic headroom, dynamic range, overs.

head shield : A metal shield installed around as much of the playback head as is possible, in order to minimize distortion due tokeeping EMI from being picked up.

heads-out heads out: A tape recording which has been rewound and is ready to play. It is generally considered best for long-term storage to leave recordings tails-outtails out for minimum print-through.

head stack : The assembly of tape heads in a magnetic recorder. The head stack normally consists of an erase head, a record head, and a playback head. Also called a head block.

rotary head : The video -recording system that uses a rotating drum carrying two or more heads which sweep across the tape at a small angle, typically 5˚-8˚. This allows a high rate of scanning to be combined with a low tape speed.

repro head : See replay head.

replay head : In a tape recorder, an electro-magnetic device for converting the magnetic patterns previously recorded on tape into a voltage whose amplitude is proportional to the pattern. On some systems, the replay head is also used as a record head, i.e., the replay head is driven rather than listened to, and it may also be used as a sync head. The replay head is sometimes called a repro head.

record head : The head on a tape recorder that applies a varying magnetic force to the tape so t hat the audio signal will be recorded on the tape for later playback. A very high-frequency signal is mixed with the audio program before it reaches the record head. This bias signal helps to linearize the over-all frequency response of the tape itself, reducing distortion.

preview head : A supplementary playback head on a tape recorder designed for reproducing the master tapes for the production of phonograph records. The signal from the preview head tells the variable-pitch circuitry on the cutting lathe the program amplitude level that it will cut one groove later. This allows the unit to space the grooves so that they do not intersect due to amplitude transients. In quieter passages, it allows the circuit to pack the grooves more closely, minimizing land.

playback head : The head on a tape recorder that is used to detect the varying remnant magnetism present on the tape. The output of this head is then amplified and heard as the recorded program.

sync head : In a multitrack tape recorder, the use of the record head to replay material from other tracks to be heard by the musicians while they simultaneously record a new track. This is essential for accurate synchronization as the extra few milliseconds afforded by its position will compensate for the inevitable delay if the signal was taken from the main replay head which is some millimeters downstream in the tape stream. The replay quality is less good when using the record head for a function for which it was not designed, thus it is important that the machine returns to monitoring from the main replay head during mixdown. (2) On a recorder used for synchronization of sound with motion pictures or videotape, a separate head that records and plays the synchronizing tone or signal. See sel-sync(2).

tape head : The transducer used in a magnetic recording tape machine to create patterns in the magnetic surface of the tape during the recording process, or conversely, to read the patterns on playback. See magnetic recording tape.

thermal headroom : A term which denotes the difference between the nominal operating temperature of a power amplifier and the maximum temperature at which the amplifier will continue operating, i.e., before its thermal protection circuitry will shut it down.

three-head : A tape recorder with separate record, replay, and erase heads.

dynamic headroom : The ability of a power amplifier to handle short bursts of power without overload.

Header essentially metadata that describes what is contained in the essence, packet, frame, or file remainder that follows, Typically, it is the part of a packet or frame that indicated the start of the data essence or payload; also, a preamble. Headers usually contain metadata such as addressing and error detection information.

Overhead : In IT land, overhead refers to any service, protocol or process that requires resources in excess of those needed by default.

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