Final answer:
The 8-bit representation of the character 'A' as 01000001 is an example of digital coding, which is essential for computer data representation and transmission.
Step-by-step explanation:
The representation of the character A by the group of 8 bits, 01000001, is an example of digital coding. This process is a way of encoding characters and symbols into a binary format that can be handled by computers and transmitted through digital communication systems. Each bit is a fundamental unit of digital data, and a group of eight such bits forms a byte.
In digital coding, each character from a text is mapped to a specific byte according to a coding standard such as ASCII, where the character 'A' is indeed represented by the byte value 01000001. Digital coding is widely used in computer systems to represent and manipulate text data and is also foundational for processes involving data compression and transmission.
In contrast, phase modulation and binary modulation are techniques used in the realm of signal processing for transmitting information, while analog transmission and pitch variation refer to aspects of audio signal processing and music theory respectively.