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Information about Delay Line

The term delay line has multiple meanings:
  • In electronics and derivative fields such as telecommunications, a delay line is a device where the input signal reaches the output of the device after a known period of time has elapsed. It is rigorously defined as a single-input-channel device, in which the output channel state at a given instant, t, is the same as the input channel state at the instant t−n, where n is a number of time units, i.e., the input sequence undergoes a delay of n time units, such as n femtoseconds, nanoseconds, or microseconds. (The delay line may have additional taps yielding output channels with values less than n.) Specific devices and approaches:
  • A transmission line or equivalent device (such as an analog delay line) used to delay a signal.
  • In computer simulation it can be used as a numerical technique, also called a bi-directional delay line or transmission line modelling (TLM) method.
  • In digital logic and digital signal processing, a delay line or digital delay line refers to a sequential logic element in which the output state at a given time n (in samples) is the same as the input was at the time n−L. Delay lines are generally expressed as z-L, where L is the length of the delay in samples. A unit delay (a delay of one sample) is therefore expressed as z-1.
  • In computing, delay line often refers to delay line memory.
  • In Optics : cavity delay lines or trombone delay lines e.g. http://www.eso.org/outreach/press-rel/pr-2000/phot-26-00.html
  • In sound reenforcement, the delay line refers to the system of loudspeakers used to supplement the main delivery system in areas where it does not reach effectively, such as the back of a large (deep) room, or underneath a balcony. The speakers are sent a signal that has been delayed in relation to the mains.
  • In neurobiology, delay lines can refer to neurons, the cells that transmit electrical information in the brain. Electrical conduction in neurons is not instantaneous; it is delayed depending on the length of the axon and other properties of the neuron (e.g. myelination). This delay can be used for time sensitive calculations; the canonical example is the calculation of inter-aural time differences in the pons, used for sound localization.
An earlier version of this page came from Federal Standard 1037C and from MIL-STD-188.
Electronics is the study of the flow of charge through various materials and devices such as, semiconductors, resistors, inductors, capacitors, nano-structures, and vacuum tubes. All applications of electronics involve the transmission of power and possibly information.
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Telecommunication is the transmission of signals over a distance for the purpose of communication. In modern times, this process typically involves the sending of electromagnetic waves by electronic transmitters, but in earlier times telecommunication may have involved the use of
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Input is the term denoting either an entrance or changes which are inserted into a system and which activate/modify a process. It is an abstract concept, used in the modeling, system(s) design and system(s) exploitation. It is usually connected with other terms, e.g.
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Channel, in communications (sometimes called communications channel), refers to the used to convey information from a sender (or transmitter) to a receiver.

Overview

A Channel can take many forms.
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For the British independent record label, see Output Recordings
Output is the term denoting either an exit or changes which exits a system and which activate/modify a process.
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time.

One view is that time is part of the fundamental structure of the universe, a dimension in which events occur in sequence, and time itself is something that can be measured.
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sequence is an ordered list of objects (or events). Like a set, it contains members (also called elements or terms), and the number of terms (possibly infinite) is called the length of the sequence.
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In its general sense, delay refers to a lapse of time. In other contexts, it may refer to one of many topics:

Law

  • To delay payment of a debt, a crime in the United Kingdom

Telecommunications and broadcasting


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To help compare orders of magnitude of different times this page lists times between 10−15 seconds and 10−12 seconds (1 femtosecond and 1 picosecond). A femtosecond is one billionth of one millionth of a second.
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To help compare orders of magnitude of different times this page lists times between 10−9 seconds and 10−8 seconds (1 nanosecond and 10 nanoseconds). A nanosecond is one billionth of a second.
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To help compare orders of magnitude of different times this page lists times between 10−6 seconds and 10−5 seconds (1 microsecond to 10 microseconds). A microsecond is one millionth of a second.
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A transmission line is the material medium or structure that forms all or part of a path from one place to another for directing the transmission of energy, such as electromagnetic waves or acoustic waves, as well as electric power transmission.
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An analog delay line is a network of electrical components connected in series; where each individual element creates a time difference or phase change between its input signal and its output signal.
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In telecommunication, signalling (UK spelling) or signaling (US spelling) has the following meanings:
  • The use of signals for controlling communications.

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computer simulation, a computer model or a computational model is a computer program that attempts to simulate an abstract model of a particular system. Computer simulations have become a useful part of mathematical modelling of many natural systems in physics
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In mathematics, a bi-directional delay line is a numerical analysis technique used in computer simulation for solving ordinary differential equations by converting them to hyperbolic equations.
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Digital electronics are electronics systems that use digital signals. Digital electronics are representations of Boolean algebra and are used in computers, mobile phones, and other consumer products.
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Digital signal processing ('DSP') is the study of signals in a digital representation and the processing methods of these signals. DSP and analog signal processing are subfields of signal processing.
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A digital delay line is a discrete element in digital filter theory, which allows a signal to be delayed by a number of samples. If the delay is an integer multiple of samples digital delay lines are often implemented as circular buffers.
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computing is synonymous with counting and calculating. Originally, people that performed these functions were known as computers. Today it refers to a science and technology that deals with the computation and the manipulation of symbols.
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Delay line memory was a form of computer memory used on some of the earliest digital computers. Like many modern forms of electronic computer memory, delay line memory was a refreshable memory, but as opposed to modern random access memory, delay line memory was serial
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Optics (ὀπτική appearance or look in Ancient Greek) is a branch of physics that describes the behavior and properties of light and the interaction of light with matter.
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Neurons (also known as neurones and nerve cells) are electrically excitable cells in the nervous system that process and transmit information. In vertebrate animals, neurons are the core components of the brain, spinal cord and peripheral nerves.
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In animals, the brain or encephalon (Greek for "in the skull"), is the control center of the central nervous system, responsible for behavior. The brain is located in the head, protected by the skull and close to the primary sensory apparatus of vision, hearing,
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axon or nerve fiber, is a long, slender projection of a nerve cell, or neuron, that conducts electrical impulses away from the neuron's cell body or soma.

Anatomy


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Myelin is an electrically insulating phospholipid layer that surrounds the axons of many neurons. It is an outgrowth of glial cells: Schwann cells supply the myelin for peripheral neurons while oligodendrocytes supply it to those of the central nervous system.
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The pons (sometimes pons Varolii after Costanzo Varolio) is a structure located on the brain stem. It is rostral to the medulla oblongata, caudal to the midbrain, and ventral to the cerebellum.
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Sound localization is a listener's ability to identify the location or origin of a detected sound or the methods in acoustical engineering to simulate the placement of an auditory cue in a virtual 3D space (see binaural recording).
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Federal Standard 1037C, entitled Telecommunications: Glossary of Telecommunication Terms is a United States Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended.
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