# SLR13 Coding sound and music Flashcards

1
Q

﻿Sample resolution

A

“The representation (or size of the numbers) used to write samples in digital sound recording.”

2
Q

Sampling rate

A

“This is a value typically expressed in samples per second, or hertz (Hz), it represents the rate at which samples of an analogue signal are taken to be converted into digital form.”

3
Q

Nyquist theorem

A

“Also known as the sampling theorem, is a principle that engineers follow in the digitisation of analogue signals. For analogue-to-digital conversion (ADC) to result in a faithful reproduction of the signal, slices, called samples, of the analogue waveform must be taken frequently.”

4
Q

Musical Instrument Digital Interface

A

“A widely used standard for interconnecting electronic musical instruments and computers.”

5
Q

Lossy compression

A

“A compression scheme that generally involves a loss of resolution in parts of the image where experience shows it will be least noticed.”

6
Q

Lossless compression

A

“A compression scheme that allows the original images to be recreated.”

7
Q

Run-length encoding

A

“A very simple form of data compression in which runs of data (that is, sequences in which the same data value occurs in many consecutive data elements) are stored as a single data value and count, rather than as the original run.”

8
Q

Dictionary-based encoding

A

“A class of lossless data compression algorithms which operate by searching for matches between the text to be compressed and a set of strings contained in a data structure maintained by the encoder.”

9
Q

Encryption

A

“The process of making data in a computer system unintelligible.”

10
Q

Caesar cipher

A

“One of the simplest forms of encryption. It is a substitution cipher, where each letter in the message (plaintext) is replaced with a letter corresponding to a certain number of letters up or down in the alphabet. In this way, a message that initially was quite readable ends up in a form that cannot be understood at a simple glance.”

11
Q

Vernam cipher

A

“Cipher that is based on the principle that each plaintext character from a message is ‘mixed’ with one character from a key stream. If a truly random key stream is used, the result will be a truly ‘random’ ciphertext which bears no relation to the original plaintext.”

12
Q

“The representation (or size of the numbers) used to write samples in digital sound recording.”

A

Sample resolution

13
Q

“This is a value typically expressed in samples per second, or hertz (Hz), it represents the rate at which samples of an analogue signal are taken to be converted into digital form.”

A

Sampling rate

14
Q

“Also known as the sampling theorem, is a principle that engineers follow in the digitisation of analogue signals. For analogue-to-digital conversion (ADC) to result in a faithful reproduction of the signal, slices, called samples, of the analogue waveform must be taken frequently.”

A

Nyquist theorem

15
Q

“A widely used standard for interconnecting electronic musical instruments and computers.”

A

Musical Instrument Digital Interface

16
Q

“A compression scheme that generally involves a loss of resolution in parts of the image where experience shows it will be least noticed.”

A

Lossy compression

17
Q

“A compression scheme that allows the original images to be recreated.”

A

Lossless compression

18
Q

“A very simple form of data compression in which runs of data (that is, sequences in which the same data value occurs in many consecutive data elements) are stored as a single data value and count, rather than as the original run.”

A

Run-length encoding

19
Q

“A class of lossless data compression algorithms which operate by searching for matches between the text to be compressed and a set of strings contained in a data structure maintained by the encoder.”

A

Dictionary-based encoding

20
Q

“The process of making data in a computer system unintelligible.”

A

Encryption

21
Q

“One of the simplest forms of encryption. It is a substitution cipher, where each letter in the message (plaintext) is replaced with a letter corresponding to a certain number of letters up or down in the alphabet. In this way, a message that initially was quite readable ends up in a form that cannot be understood at a simple glance.”

A

Caesar cipher

22
Q

“Cipher that is based on the principle that each plaintext character from a message is ‘mixed’ with one character from a key stream. If a truly random key stream is used, the result will be a truly ‘random’ ciphertext which bears no relation to the original plaintext.”

A

Vernam cipher