Audio level compression, also called compression or limiting, is a process that manipulates the dynamic range of an audio signal. Compression is used in sound recording and live sound reinforcement fields to improve the perceived quality of audio. (This should not be confused with audio data compression, which reduces the data size of digital audio signals.) A compressor is the device used to create compression. ...more on Wikipedia about "Audio level compression"
Time stretching is the process of changing the speed or duration of an audio signal without affecting its pitch. ...more on Wikipedia about "Audio timescale-pitch modification"
A falling scream is a sound effect used mostly in animation and live action movies when an object falls down with great speed. It is generally described as a long, continuous whistle from the dropping point, which gets louder in mid-flight then dies out at the point of impact. It often demonstrates the Doppler effect. ...more on Wikipedia about "Falling scream"
The foley artist on a film crew is the person who creates and records many of the sound effects. Foley artists, editors, and supervisors are highly specialized and are essential for producing a professional-sounding soundtrack suitable for distribution and exhibition. ...more on Wikipedia about "Foley artist"
A sampler is an electronic musical instrument that can record and store audio signal samples, generally recordings of existing sounds, and play them back at a range of pitches. However, sampler is sometimes used to describe instruments which store and play back samples but lack the capability to record them. (See Rompler.) ...more on Wikipedia about "Sampler (musical instrument)"
A slide whistle (variously known as a swanee whistle, piston flute or less commonly jazz flute) is a wind instrument consisting of a fipple like a recorder's and a tube with a piston in it. It thus has an air reed like some woodwinds, but varies the pitch with a slide. Because the air column is cylindrical and open at one end and closed at the other, it overblows the third harmonic (like the clarinet, the only closed-end, cylindrical Western orchestral instrument). ...more on Wikipedia about "Slide whistle"
Sound effects or audio effects are artificially created or enhanced sounds, or sound processes used to emphasize artistic or other content of movies, video games, music, or other media. ...more on Wikipedia about "Sound effect"
In American radio, film, and television, walla is a sound effect imitating the murmur of a crowd in the background. A group of actors brought together in the post-production stage of film production to create this murmur is known as a walla group. According to one story, walla received its name during the early days of radio, when it was discovered that having several people repeat the sound walla in the background was sufficient to mimic the indistinct chatter of a crowd. Nowadays, walla actors make use of real words and conversations, often improvised, tailored to the languages, speech patterns, and accents that might be expected of the crowd to be mimicked. Walla is called rhubarb in the UK and rhabarber in Germany, perhaps in part reflecting the varying textures of crowd noise in the different countries. ...more on Wikipedia about "Walla"
Wild track, also known as wild sound, is an audio recording intended to be synchronized with film or video but recorded separately. Generally, the term "wild track" refers to sound recorded on location, such as sound effects gathered when the cameras were not rolling or extra takes of lines performed for audio only. ...more on Wikipedia about "Wild track"
The Wilhelm scream is a stock sound effect first used in 1951 for the movie Distant Drums. It has been featured in dozens of movies since. Alongside a certain recording of the cry of the Red-tailed Hawk, the "Universal Telephone Ring" and "Castle Thunder", it is probably the most well-known cinematic sound cliché. ...more on Wikipedia about "Wilhelm scream"
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