an audible tone
121Telephone exchange — A telephone operator manually connecting calls with cord pairs at a telephone switchboard. In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central… …
122Overtone — Overtones redirects here. For other uses, see Overtones (disambiguation). An overtone is any frequency higher than the fundamental frequency of a sound. The fundamental and the overtones together are called partials. Harmonics are partials whose… …
123WWV (radio station) — WWV is the callsign of NIST s shortwave radio station located in Fort Collins, Colorado. WWV s main function is the continuous dissemination of official U.S. Government time signals. The station broadcasts simultaneously on five distinct… …
124Video game music — Part of a series on …
125Vocal pedagogy — Vocal pedagogy, or voice pedagogy, is the study of the teaching of singing. Vocal pedagogists are people who study the teaching of singing. To some extent all voice teachers are vocal pedagogists because vocal pedagogy informs them about not only …
126Superheterodyne receiver — A 5 tube superheterodyne receiver made in Japan around 1955 In electronics, a superheterodyne receiver (sometimes shortened to superhet) uses frequency mixing or heterodyning to convert a received signal to a fixed intermediate frequency, which… …
127Maria Callas — Callas redirects here. For other uses, see Callas (disambiguation). Maria Callas Maria Callas (Greek: Μαρία Κάλλας) (December 2, 1923 – September 16, 1977) was an American born Greek soprano and one of the most renowned opera singers of the… …
128Pitch (music) — In musical notation, the different vertical positions of notes indicate different pitches. Pitch is an auditory perceptual property that allows the ordering of sounds on a frequency related scale.[1] Pitches are compared as higher and lower in… …
