SLR13 Coding sound and music Flashcards
Sample resolution
“The representation (or size of the numbers) used to write samples in digital sound recording.”
Sampling rate
“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.”
Nyquist theorem
“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.”
Musical Instrument Digital Interface
“A widely used standard for interconnecting electronic musical instruments and computers.”
Lossy compression
“A compression scheme that generally involves a loss of resolution in parts of the image where experience shows it will be least noticed.”
Lossless compression
“A compression scheme that allows the original images to be recreated.”
Run-length encoding
“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.”
Dictionary-based encoding
“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.”
Encryption
“The process of making data in a computer system unintelligible.”
Caesar cipher
“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.”
Vernam cipher
“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.”
“The representation (or size of the numbers) used to write samples in digital sound recording.”
Sample resolution
“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.”
Sampling rate
“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.”
Nyquist theorem
“A widely used standard for interconnecting electronic musical instruments and computers.”
Musical Instrument Digital Interface
