Signal FAQs:

Q: Are signals typically provided by a sensor?

A: Yes, and often the original form of a signal is converted to another form of energy using a transducer.

Q: Is a signal transmitted to the receiving telephone by wires?

A: Yes, at the receiver it is reconverted into sounds.

Q: Is a signal a measured response to changes in physical phenomena?

A: Yes, such as sound, light, temperature, position, or pressure.

Q: Is a signal vector-valued with dimension three?

A: Yes.

Q: Are signals present in all digital electronics?

A: Yes, and notably computing equipment and data transmission.

Q: Is a signal converted to an electrical signal by a microphone?

A: Yes, and generating a voltage signal as an analog of the sound signal, making the sound signal available for further signal processing.

Q: Is a signal any continuous signal for which the time varying feature of the signal is a representation of some other time varying quantity?

A: Yes, and i.e., analogous to another time varying signal.

Q: Is a signal a sequence of images?

A: Yes.

Q: Is a signal a signal that is constructed from a discrete set of waveforms of a physical quantity so as to represent a sequence of discrete values?

A: Yes.

Q: Are signals now generally processed digitally?

A: Yes.

Q: Are signals often referred to as time series in other fields?

A: Yes.

Q: Is a signal usually accompanied by noise?

A: Yes.

Q: Are signals the output of a thermocouple?

A: Yes, and which conveys temperature information, and the output of a pH meter which conveys acidity information.

Q: Is a signal a digital signal with only two possible values?

A: Yes, and describes an arbitrary bit stream.

Q: Are signals often referred to as continuous signals even when the signal functions are not continuous?

A: Yes, an example is a square-wave signal.

Q: Is a signal one-dimensional?

A: Yes, and the range is generally three-dimensional.

Q: Are signals the field of information theory?

A: Yes.

Q: Is a signal an electric potential?

A: Yes, The domain is more difficult to establish.

Q: Are signals between continuous and discrete time?

A: Yes.

Q: Is a signal available for further processing by electrical devices such as electronic amplifiers and electronic filters?

A: Yes, and can be transmitted to a remote location by electronic transmitters and received using electronic receivers.

Q: Is a signal a codified message?

A: Yes, that is, the sequence of states in a communication channel that encodes a message.

Q: Are signals in signal processing?

A: Yes.

Q: Are signals defined as the continuous-time waveform signals in a digital system?

A: Yes, and representing a bit-stream.

Q: Is a signal to be represented as a sequence of numbers?

A: Yes, and it is impossible to maintain exact precision - each number in the sequence must have a finite number of digits.

Q: Is a signal the sampling of a continuous signal?

A: Yes, and approximating the signal by a sequence of its values at particular time instants.

Q: Are signals quantized?

A: Yes, while analog signals are continuous.

Q: Is a signal sometimes defined as a sequence of discrete values?

A: Yes, that may or may not be derived from an underlying continuous-valued physical process.

Q: Is a signal any real-valued function which is defined at every time t in an interval?

A: Yes, and most commonly an infinite interval.

Q: Is a signal the set of real numbers , whereas the domain of a discrete-time signal is the set of integers?

A: Yes, What these integers represent depends on the nature of the signal; most often it is time.