“delay line”的概念、定义、翻译、参考文献-科学参考

delay line

Physics

A component in an electronic circuit that is introduced to provide a specified delay in transmitting the signal. Coaxial cable or inductor-capacitor networks can be used to provide a short delay but for longer delays an acoustic delay line is required. In this device the signal is converted by the piezoelectric effect into an acoustic wave, which is passed through a liquid or solid medium, before reconversion to an electronic signal.

Computer

An electronic device that produces a finite accurate time delay between a signal imposed on its input and the appearance of the same signal at its output. These devices may be used as short-term signal stores or to provide accurate delays in signal-processing circuits. In an acoustic delay line electrical signals are converted into a pattern of acoustic (sound) waves that travel through a medium between a transmitter and receiver.
Delay lines were the most common storage devices in first generation computers: this acoustic memory was used, for example, in EDSAC, EDVAC, pilot ACE and ACE, UNIVAC 1, and LEO 1. In EDSAC (1949), quartz crystals were used as transducers and the ultrasonic pulses were passed along a tube of mercury about 5 feet (1.5 metres) in length. The delay was approximately 1 millisecond but it enabled nearly 1000 pulses to be stored. Later acoustic memory used magnetostrictive transducers and nickel-iron wire, with the electrical signals converted into stress waves.
Although delay lines as storage devices have been superseded by more cost-effective components they are still to be found in almost all computer motherboards, where they are used to equalize the delay between signals in parallel busses, as found with most microprocessors operating at 100 MHz or more. RCB tracks are used to present equal path lengths for each signal, enabling fast clocking to be used.

Electronics and Electrical Engineering

Any circuit, device, or transmission line that introduces a known delay in the transmission of a signal. Coaxial cable or suitable L-C (inductance-capacitance) networks may be used to provide short delay times but the attenuation is usually too great when longer delay times are required.
Acoustic delay lines are often employed when a longer delay is needed. The signals are converted to acoustic waves, usually by means of the piezoelectric effect. They are then delayed by circulation through a liquid or solid medium before being reconverted into electrical signals. Fully electronic analogue delay lines are now being provided by charge-coupled devices. Shift registers and charge-coupled devices may be used for digital delay lines.

单词	delay line
释义	delay line Physics A component in an electronic circuit that is introduced to provide a specified delay in transmitting the signal. Coaxial cable or inductor-capacitor networks can be used to provide a short delay but for longer delays an acoustic delay line is required. In this device the signal is converted by the piezoelectric effect into an acoustic wave, which is passed through a liquid or solid medium, before reconversion to an electronic signal. Computer An electronic device that produces a finite accurate time delay between a signal imposed on its input and the appearance of the same signal at its output. These devices may be used as short-term signal stores or to provide accurate delays in signal-processing circuits. In an acoustic delay line electrical signals are converted into a pattern of acoustic (sound) waves that travel through a medium between a transmitter and receiver. Delay lines were the most common storage devices in first generation computers: this acoustic memory was used, for example, in EDSAC, EDVAC, pilot ACE and ACE, UNIVAC 1, and LEO 1. In EDSAC (1949), quartz crystals were used as transducers and the ultrasonic pulses were passed along a tube of mercury about 5 feet (1.5 metres) in length. The delay was approximately 1 millisecond but it enabled nearly 1000 pulses to be stored. Later acoustic memory used magnetostrictive transducers and nickel-iron wire, with the electrical signals converted into stress waves. Although delay lines as storage devices have been superseded by more cost-effective components they are still to be found in almost all computer motherboards, where they are used to equalize the delay between signals in parallel busses, as found with most microprocessors operating at 100 MHz or more. RCB tracks are used to present equal path lengths for each signal, enabling fast clocking to be used. Electronics and Electrical Engineering Any circuit, device, or transmission line that introduces a known delay in the transmission of a signal. Coaxial cable or suitable L-C (inductance-capacitance) networks may be used to provide short delay times but the attenuation is usually too great when longer delay times are required. Acoustic delay lines are often employed when a longer delay is needed. The signals are converted to acoustic waves, usually by means of the piezoelectric effect. They are then delayed by circulation through a liquid or solid medium before being reconverted into electrical signals. Fully electronic analogue delay lines are now being provided by charge-coupled devices. Shift registers and charge-coupled devices may be used for digital delay lines.
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