Tape head
Sound head is the generic term for the speech , listening or combination heads of tape recorders , video recorders and film projectors used for sound recording or sound reproduction .
A tape recorder typically has two or three magnetic heads , rarely more:
- The erase head (LK) for demagnetization (erasure) of the tape with high frequency (rarely constant field)
- The recording head or speaking head (SK) for the actual recording
- The playback head or listening head (HK) for playback or rear tape control (control of the recording)
The listening and speaking head can be replaced by a combination head, which, however, means a compromise in terms of acoustic quality (head gap) and the need to switch the head from recording to playback. There is also no longer any possibility of monitoring the rear belt. With cassette recorders this is mostly the case for reasons of space and costs, with high-quality devices the hearing and speaking heads are housed in a common housing ("3-head cassette deck").
Also VCR and movie projectors for films with magnetic sound have sound heads:
When VCR is the sound track at the edge of the strip next to the diagonally adjacent image tracks with the head on the head drum are scanned. An analog audio track must therefore be read or written with a separate audio head, whereas the data of digital audio tracks are often recorded as part of the helical video track.
In the case of film, the soundtrack is arranged next to the images, either as magnetic sound or as optical sound . For scanning, the film must be guided over a sound wave which, in contrast to the jerky movement of the image reproduction, creates a uniform movement of the film.
See also
literature
- Gustav Büscher, A. Wiegemann: Little ABC of electroacoustics. 6th edition, Franzis Verlag, Munich, 1972, ISBN 3-7723-0296-3
Web links
Frank Brattig: Something about tape heads and tapes for analog magnetic sound recording. (PDF, 1.03 MB) Archived from the original on September 3, 2013 ; accessed on March 12, 2014 .