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The commonly given measurement of PMPO (peak music power out) is largely meaningless and often used in marketing literature; in the late 1960s there was much controversy over this point and the US Government (FTA) required that RMS figures be quoted for all high fidelity equipment. Music power has been making a comeback in recent years.
Higher speed machines using compact cassettes commonly use 3 3 ⁄ 4 ips. Although the microcassette is specified to have a standard record speed of 2.4 cm/s and low speed of 1.2 cm/s, in the dictaphone application for which it was designed these speeds are in practice identical to 15 ⁄ 16 ips and 15 ⁄ 32 ips. Playback speed is not ...
The audio typist will have learnt to touch type at a high speed which means they can look at the monitor or keep an eye on a waiting area as they are typing because they do not need to look at the keyboard. A specialist player called a micro cassette transcriber (below) is used for playback of the cassettes to maximise the typing speed.
Digital music players such as CD, DAT, or MP3 use electronic clocks to govern the speed of replay. The circuits used to control these frequencies do permit a very small amount of flutter (usually termed jitter ), but the level is far below that which the human ear can discern.
Thus, the roll represented a recording of the actual performance of an individual, not just the more common method of punching the master roll through transcription of the sheet music. This technology to record a live performance onto a piano roll was not developed until 1904. Piano rolls were in continuous mass production from 1896 to 2008.
Sound intensity, also known as acoustic intensity, is defined as the power carried by sound waves per unit area in a direction perpendicular to that area, also called the sound power density and the sound energy flux density. [2]