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With call in dictation systems, the author dials a phone number, enters a PIN and starts dictating. Touch tone controls allow for start, pause, playback, and sending of dictation audio file. The call-in dictation systems usually feature a Pod that can be plugged into a phone line.
Top left, stereo headphones with a cassette player built into one side. Top right, a portable cassette player and audio recorder with radio for use with headphones. Below, a miniature dictation machine mainly for business dictations, use by journalists, etc. The latter is far more widely used than the other two types, which were rather rare.
Wireless telegraphy or radiotelegraphy, commonly called CW (continuous wave), ICW (interrupted continuous wave) transmission, or on-off keying, and designated by the International Telecommunication Union as emission type A1A or A2A, is a radio communication method.
Frances Densmore and Blackfoot chief Mountain Chief working on a recording project of the Bureau of American Ethnology (1916).. Sound recording and reproduction is the electrical, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental music, or sound effects.
They began their work at Bell's Volta Laboratory in Washington, D. C., in 1879, and continued until they were granted basic patents in 1886 for recording in wax. [ 46 ] Although Edison had invented the phonograph in 1877, the fame bestowed on him for this invention was not due to its efficiency.
A Webster-Chicago Model 7 wire recorder from 1948 Poulsen Telegraphone recorder from 1922. Wire recording, also known as magnetic wire recording, was the first magnetic recording technology, an analog type of audio storage. It recorded sound signals on a thin steel wire using varying levels of magnetization.