Resampling (audio)
Encyclopedia
Resampling is synonymous with several processes commonly used in manipulating audio, through which a segment of sampled audio (often erroneously termed a sample) is manipulated before being stored back to a (possibly different) sampled format.
involves converting a sampled signal from one sampling frequency to another without changing the period of the sample as would occur if the sampled audio was played at the new rate directly. For instance, the output waveform of a digital audio workstation
that was processed at 96 kHz must be resampled to 44.1 kHz to be placed on a Compact Disc
. See sample rate conversion
.
.
that are reused or substituted in the work, synonymous with bouncing as applied to multitrack recording
. Such resampling was commonplace to work with the limitations of contemporary samplers
or other digital audio manipulation systems
, where memory or processor use could be reduced by combining several samples that would always sound simultaneously through recording their combination to make a new sample
Sample rate conversion
This operation in digital signal processingDigital signal processing
Digital signal processing is concerned with the representation of discrete time signals by a sequence of numbers or symbols and the processing of these signals. Digital signal processing and analog signal processing are subfields of signal processing...
involves converting a sampled signal from one sampling frequency to another without changing the period of the sample as would occur if the sampled audio was played at the new rate directly. For instance, the output waveform of a digital audio workstation
Digital audio workstation
A digital audio workstation is an electronic system designed solely or primarily for recording, editing and playing back digital audio. DAWs were originally tape-less, microprocessor-based systems such as the Synclavier and Fairlight CMI...
that was processed at 96 kHz must be resampled to 44.1 kHz to be placed on a Compact Disc
Compact Disc
The Compact Disc is an optical disc used to store digital data. It was originally developed to store and playback sound recordings exclusively, but later expanded to encompass data storage , write-once audio and data storage , rewritable media , Video Compact Discs , Super Video Compact Discs ,...
. See sample rate conversion
Sample rate conversion
Sample rate conversion is the process of converting a signal from one sampling rate to another, while changing the information carried by the signal as little as possible...
.
Sample depth conversion
This operation in digital signal processing involves converting each sample of a sampled signal from one representation of amplitude to another. For instance, the output waveform of a digital audio workstation that was processed using 24 bits to represent amplitude would be resampled to 16 bits to be placed on a Compact Disc. See quantization (sound processing)Quantization (sound processing)
In signal processing and digital audio, quantization is the process of approximating a continuous range of values by a relatively small set of discrete symbols or integer values...
.
Mixing
The term "resampling" is often applied to short recordings completed before final mixdownAudio mixing (recorded music)
In audio recording, audio mixing is the process by which multiple recorded sounds are combined into one or more channels, most commonly two-channel stereo. In the process, the source signals' level, frequency content, dynamics, and panoramic position are manipulated and effects such as reverb may...
that are reused or substituted in the work, synonymous with bouncing as applied to multitrack recording
Multitrack recording
Multitrack recording is a method of sound recording that allows for the separate recording of multiple sound sources to create a cohesive whole...
. Such resampling was commonplace to work with the limitations of contemporary samplers
Sampler (musical instrument)
A sampler is an electronic musical instrument similar in some respects to a synthesizer but, instead of generating sounds, it uses recordings of sounds that are loaded or recorded into it by the user and then played back by means of a keyboard, sequencer or other triggering device to perform or...
or other digital audio manipulation systems
Digital audio workstation
A digital audio workstation is an electronic system designed solely or primarily for recording, editing and playing back digital audio. DAWs were originally tape-less, microprocessor-based systems such as the Synclavier and Fairlight CMI...
, where memory or processor use could be reduced by combining several samples that would always sound simultaneously through recording their combination to make a new sample