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Entries found for search: delay

group delay : The rate of change of phase of the response of a device or a system as a function of frequency. A pure time delay, equal at all frequencies, gives a constant slope ofphase versus frequency. If, in an audio component (frequently a passive network), this slope is not constant but varies with frequency, the component is said to produce group delay distortion. This is equivalent to a time delay that varies with frequency, called a group delay because the distortion occurs within a group of adjacent frequencies, but not over the entire spectrum. The audible result is a loss of precision in musical transients; they are spread out or smeared in time and a more diffuse stereo image results.

MIDI Delay : (1) A facility provided on some sequencers to allow a track to be fractionally delayed or advanced relative to others. Particularly useful for synthesizer voices which speak late, or to give a part a sense of urgency by being played very slightly ahead of the beat. Also called MIDI offset. (2) Noticeable delay in the transmission caused by MIDI Choke. This usually happens when too many MIDI devices try to send bulk dumps or unthinned continuous controller data over the same MIDI port.

propagation delay : The time taken for a signal to move through a circuit, system, or device.

pre-delay : In reverberation, the time between the incident sound delay and the first sound reflection before any reflected sound is heard.

tape delay : The original delay lines were made by using a three-head tape recorder to record a signal while playing it back on the same machine. : The distance between the record and replay heads causes a time delay which varies with tape speed; this technique is called tape delay. If some of the replay signal was mixed with the direct signal, a pseudo-reverb could be created. The record-replay idea was further developed with specific machines which used tape loops and multiple replay heads and the ability to adjust the contribution and feedback of each head. These machines were replaced with DDLs.

delay : (1) The first stage of a five-stage D(elay)AD(ecay)SR envelope, which delays the beginning of the envelope’s attack segment. See ADSR. (2) An audio effect which temporarily suppresses the beginning of a sound, producing echo, chorusing, phasing, and flanging effects. A modulated digital delay effect which varies the time and/or intensity of the delay effect over time. See double tracking. (3) A signal processor used for flanging, chorusing, and echo, that holds its input for some period of time before passing it to the output, or the algorithm within a signal processor that creates delay. Also used in artificial reverberation systems and to provide delayed sound to certain loudspeakers in time-coherent sound reinforcement systems. (4) See MIDI delay.

delay line : Used to simulate an acoustic echo or reverberation. There exist both digital delay lines (DDL) and analog delay lines as well. The original delay lines were made by using tape recorders to record a signal while playing it back on the same machine. The distance between the record and reproduce heads causes a time delay; this technique is called tape delay. See tape delay.

delay line feedback : A type of modulation which creates a series of echoes when the modulation source is boosted. The greater the amount of feedback, the more repetitions of each echoed event.

digital delay line (DDL) : See delay line.

digital time delay : See delay.



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