What is multichannel and multidimensional signal?

Answer 1

A multichannel signal refers to a signal that consists of multiple individual channels, each representing a different aspect or component of the overall signal. These channels can be used to convey different types of information simultaneously. On the other hand, a multidimensional signal refers to a signal that has multiple dimensions, with each dimension representing a different characteristic or parameter of the signal. This can include signals that vary in multiple dimensions such as time, frequency, spatial location, or any other relevant parameter.

Answer 2

Multichannel Signals. Signals which are generated by multiple sources or multiple sensors are called Multichannel signals. These signals are represented by vector.

S(t) = [(S1(t) S2(t) S3 (t)]

Above signal represents a 3-channel signal. In electrocardiography, 3-lead and 12-lead electrocardiograph is often used in practice, which results in 3-channel and 12-channel signals, respectively.

Multidimensional Signal. A signal is called multidimensional signal if it is a function of M independent variables. For example : Speech signal is a one dimensional signal because amplitude of signal depends upon single independent variable, namely, time. TV Picture Signal : A B/W picture signal is an example of 2-dimensional signal because brightness of the signal at each point is a function of two spatial independent variable, namely, x and y. Variables x and y are width and height of the picture element.

A colored picture signal is an example of 3-dimensional signal because brightness of the signal at each point is a function of three independent variables, namely, x, y and time (t).

-------Arif, RUET.