Digital Audio

Time Compression/Expansion

The Music Telegraph | Text 2019/02/12 [14:24]
Digital Audio

Time Compression/Expansion

The Music Telegraph| 입력 : 2019/02/12 [14:24]

▲ Concept of Granular synthesis

 



Time Compression/Expansion

 

 

Time Compression/Expansion:

A process where a sound file of a given length is electronically speed up or slowed down so it will play in a shorter or longer period of time. When speaking of time compression or expansion it is generally assumed that the pitch of the material is not changed, so this isn’t as simple as just speeding up or slowing down the playback device. This type of process requires that the material’s playback speed be adjusted and then some type of pitch correction applied to return its pitch to normal. These techniques have been fairly common for a number of years, particularly in commercial studios where it is common to have a 32 second (for example) commercial that must run in a 30 second slot of time. **Excerpts from Sweetwater Sound (https://www.sweetwater.com/insync/time-compression-expansion/)

 

Algorithm:

1. Pitch/Time are Not tied

2. +/- 33% is ‘OK’

 

 

 

Granular synthesis (Time Compression/Expansion technique derived from granular synthesis):

is a method by which sounds are broken into tiny grains which are then redistributed and reorganized to form other sounds. (Refer to the Top picture)

 

What is a grain?

A grain is a small piece of sonic data. In granular synthesis it will usually have a duration between 10 to 50 ms. The grain can be broken down into smaller components, the envelope and the contents. The envelope is used primarily so that there is no distortion and crunching noises at the beginning and end of the sample. The shape of the envelope though has a significant effect on the grain. The contents of the grain is audio. This can be derived from any source. Sine wave, square wave, audio sample, etc. **Excerpts from Granularsynthesis.com (https://granularsynthesis.com/guide.php)

 

 

< Copyright ⓒ The Music Telegraph :: Prohibit reprinting and redistribution >
The Music Telegraph Another articles
Comment
  • 도배방지 이미지

Time Compression/Expansion Related Articles

광고
Most Read
1
Broadway Orchestra Wage Scales: What Musicians Earn
2
Sound Magic 'Neo Orchestra CE': A Full Symphony Orchestra VST/AU Plug-in and Sample Library designed for Cinematic Music, bringing Ultra Realistic Sound of Solo and Ensemble Instruments
3
Review #7 (Digital Audio)
4
Basic Waveforms of Synthesizer: Pulse Wave
5
From Airplay to Income: Understanding U.S. TV Music Royalties
6
Yooz Music 'Mawashi Geri': A Complete Kick-Drum Designing Instrument that brings Complete Control Over Your Kick-Drum Sound
7
About the 'Harry Fox Agency': A Key Player in Music Rights Management
8
Ablaze 'Screamer': The Ultimate Plugin that Instantly Transforms Raw Screams into Massive, Studio-Ready Extreme Vocals for Modern Metal
9
Understanding Sound Fields: Near, Close, Critical, and Reverberant Space in Acoustics
10
About 'Spectrum of Sound': Sub-Sonic, Sonic, and Ultra-Sonic
광고
Digital Audio (popular articles)
광고
Most Recent
'Days Of Yore' Launches Boutique Audio Brand with Bold Line of Handcrafted Hardware
From Airplay to Income: Understanding U.S. TV Music Royalties
Building from the Bottom Up: The Foundation of Modern Music Production
Frap Tools 'Magnolia': An 8-Voice Analog Thru-Zero FM Synthesizer
Behind the Sound: The Critical Roles of Monitor and FOH Engineers in Live Performance
광고
광고
광고
광고
광고
광고
광고
광고
광고