Browse Definitions :
Definition

chorus

In audio production, chorus is one of the two standard audio effects defined by the Musical Instrument Digital Interface ( midi ). The other effect is reverb (reverberation). Chorus adds a swirling property to a sound that it is applied to, thickening the sound. Chorus is commonly used with instruments like the electric piano and guitar and with synthesizers. Most sound cards that have an onboard MIDI sound set contain both chorus and reverb.

A digital signal processing ( DSP ) algorithm that combines digital delays and at least one low-frequency oscillator (LFO) produces the chorus effect. The delays add a time offset and the LFOs vary the pitch. Varying the number of delays used in the design of the chorus DSP algorithm changes the quality of the chorusing effect. In addition, the number and speed of the LFOs used in the algorithm design also contribute to the overall effect. In general, the more individual delay lines and LFOs that are part of the DSP algorithm, the thicker and more complex the effect can be.

Here's how it works: An audio signal that is to be processed with chorus is first delayed by a small amount. (Typical delay times are small, in the range of 5 to 40 milliseconds.) This produces a doubling effect. Each delayed signal is then sent to the LFO. The LFO takes the delayed signal and moves its pitch up and down, changing the tuning from sharp to flat. The LFO usually runs at a slow speed; 1 to 5 oscillations per second are typical. The output of the delayed and pitch-altered signal is then mixed in with the original audio. This blending completes the chorusing effect.

This was last updated in March 2008
SearchNetworking
SearchSecurity
  • man in the browser (MitB)

    Man in the browser (MitB) is a security attack where the perpetrator installs a Trojan horse on the victim's computer that is ...

  • Patch Tuesday

    Patch Tuesday is the unofficial name of Microsoft's monthly scheduled release of security fixes for the Windows operating system ...

  • parameter tampering

    Parameter tampering is a type of web-based cyber attack in which certain parameters in a URL are changed without a user's ...

SearchCIO
  • chief procurement officer (CPO)

    The chief procurement officer, or CPO, leads an organization's procurement department and oversees the acquisitions of goods and ...

  • Lean Six Sigma

    Lean Six Sigma is a data-driven approach to improving efficiency, customer satisfaction and profits.

  • change management

    Change management is a systematic approach to dealing with the transition or transformation of an organization's goals, processes...

SearchHRSoftware
SearchCustomerExperience
  • clickstream data (clickstream analytics)

    Clickstream data and clickstream analytics are the processes involved in collecting, analyzing and reporting aggregate data about...

  • neuromarketing

    Neuromarketing is the study of how people's brains respond to advertising and other brand-related messages by scientifically ...

  • contextual marketing

    Contextual marketing is an online marketing strategy model in which people are served with targeted advertising based on their ...

Close