“signal”的概念、定义、翻译、参考文献-科学参考

signal

Physics

The variable parameter that contains information and by which information is transmitted in an electronic system or circuit. The signal is often a voltage source in which the amplitude, frequency, and waveform can be varied.

Statistics

The value of a measurement that would be observed if the measurement were not contaminated by random errors.

Chemical Engineering

Transmitted information about a process variable in a controlled system in the form of a voltage, current, pneumatic, mechanical, or digital signal. The error signal in a closed-loop system is the signal formed when subtracting a particular return signal from its corresponding input signal. The input signal is the signal applied to the system, whereas the output signal is the signal delivered by the system.

Computer

1. A form of data that is usually envisaged as a sequence of values of a scalar quantity—the amplitude—recorded (i.e. measured, tabulated, or plotted) against time. The amplitude is most often, but by no means always, an electric potential. For example, if the signal is a sine wave with a mean value of zero (symmetrical about zero volts), then the amplitude is the value of the peak voltage. See also discrete and continuous systems, space domain.
2. Any path transmitting some data or function.
3. To convey data or control information from one point to another.

Electronics and Electrical Engineering

A variable electrical parameter, such as voltage or current, that is used to convey information through an electronic circuit or system. The sequence of values of the parameter, recorded against time, represents the information. An analogue signal varies continuously in amplitude and time. The amplitude of a digital signal varies discretely: it will be at any one of a group of different levels, usually two, at any particular time.
In communications systems, signal transmission is either analogue or digital. In analogue transmission signals are transmitted in continuously variable form. In digital transmission there are two discrete signal levels representing a binary ‘1’ and binary ‘0’. In multilevel signalling systems the number of signal levels is increased from two, thereby allowing more information to be transmitted in each ‘bit’. See also digital communications; digital codes.

单词	signal
释义	signal Physics The variable parameter that contains information and by which information is transmitted in an electronic system or circuit. The signal is often a voltage source in which the amplitude, frequency, and waveform can be varied. Statistics The value of a measurement that would be observed if the measurement were not contaminated by random errors. Chemical Engineering Transmitted information about a process variable in a controlled system in the form of a voltage, current, pneumatic, mechanical, or digital signal. The error signal in a closed-loop system is the signal formed when subtracting a particular return signal from its corresponding input signal. The input signal is the signal applied to the system, whereas the output signal is the signal delivered by the system. Computer 1. A form of data that is usually envisaged as a sequence of values of a scalar quantity—the amplitude—recorded (i.e. measured, tabulated, or plotted) against time. The amplitude is most often, but by no means always, an electric potential. For example, if the signal is a sine wave with a mean value of zero (symmetrical about zero volts), then the amplitude is the value of the peak voltage. See also discrete and continuous systems, space domain. 2. Any path transmitting some data or function. 3. To convey data or control information from one point to another. Electronics and Electrical Engineering A variable electrical parameter, such as voltage or current, that is used to convey information through an electronic circuit or system. The sequence of values of the parameter, recorded against time, represents the information. An analogue signal varies continuously in amplitude and time. The amplitude of a digital signal varies discretely: it will be at any one of a group of different levels, usually two, at any particular time. In communications systems, signal transmission is either analogue or digital. In analogue transmission signals are transmitted in continuously variable form. In digital transmission there are two discrete signal levels representing a binary ‘1’ and binary ‘0’. In multilevel signalling systems the number of signal levels is increased from two, thereby allowing more information to be transmitted in each ‘bit’. See also digital communications; digital codes.
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