# Post History

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**#3: Post edited**

- > Is there a mathematical process resembling the terms "digital"/"discrete" and "analog"/"continuous"?
- Rounding (down, or up, or to the nearest integer) is he mathematical process which discretizes value.
- Multiplication by the [Ш-function (Dirac comb)](https://en.wikipedia.org/wiki/Dirac_comb) discretizes time.
~~> There is no such thing as digital signal. There is only digital information imposed on an analog signal. "Digital signal" is just a shorthand.~~**[Prof. Donald Cox]**

- > Is there a mathematical process resembling the terms "digital"/"discrete" and "analog"/"continuous"?
- Rounding (down, or up, or to the nearest integer) is he mathematical process which discretizes value.
- Multiplication by the [Ш-function (Dirac comb)](https://en.wikipedia.org/wiki/Dirac_comb) discretizes time.
- >
**I always had trouble understanding the terms "digital" and "analog"...** **I'll can reply with a quote from a lecture by Prof. Donald Cox :****>**There is no such thing as digital signal. There is only digital information imposed on an analog signal. "Digital signal" is just a shorthand.

##
**#2: Post edited**

- > Is there a mathematical process resembling the terms "digital"/"discrete" and "analog"/"continuous"?
- Rounding (down, or up, or to the nearest integer) is he mathematical process which discretizes value.
~~Multiplication by the [Ш-function (Dirac comb)](https://en.wikipedia.org/wiki/Dirac_comb) discretizes time.~~

**> There is no such thing as digital signal. There is only digital information imposed on an analog signal. "Digital signal" is just a shorthand. [Prof. Donald Cox]**

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**#1: Initial revision**

Rounding (down, or up, or to the nearest integer) is he mathematical process which discretizes value.

Multiplication by the [Ш-function (Dirac comb)](https://en.wikipedia.org/wiki/Dirac_comb) discretizes time.