(1) A sound characteristic of repeating vibration at a specific frequency. Unpitched sound is called noise. Pitch is measured in units called Hertz (Hz) which is equivalent to “cycles per second.” For practical purposes, pitch and frequency are interchangeable terms.
(2) The number of grooves per inch on the surface of a phonograph record.
(3) The subjective impression of the frequency, or musical tone of a sound, expressed in the latter case by its name-number, e.g., A2. Also the frequency of that musical note, e.g., for this example, 440Hz. (4) The distance between two perforations or sprocket holes along a strip of film. Camera-original film is generally short-pitch, and print film is generally long-pitch, the difference in these lengths being on the order of .0006″ per frame. The two different pitches are necessary to prevent slippage between original and print film as they wind around various sprocket wheels in the contact printers used to make most prints.