Key-actuated volume control

Details Key-actuated volume control Key-actuated volume control

1989-11-13

1991-10-01

Isen, Forester W.

Electrical audio signal processing systems and devices

Including amplitude or volume control

With manual volume control

381 82, H03G 300

Patent

active

050540769

ABSTRACT:
A device for providing limited-access volume control for at least one remote speaker in an audio system, the device comprising a lockable, key-actuable attenuator that attenuates an input audio signal to provide an attenuated output audio signal. The attenuator is adjustable upon the insertion of a key to selectively adjust the degree of attenuation, and is lockable upon the removal of the key to prevent unauthorized adjustment of the degree of attenuation. The attenuator preferably comprises a transformer having primary and secondary windings. A plurality of tap means is connected to the secondary winding. A lockable, key-actuable, multiple position switch, having a contact corresponding to each switch position, is connected to the tap means with each contact being connected to one of the tap means. The switch can be operated upon insertion of a key to move from position to position and can be locked upon removal of the key.

REFERENCES:
patent: 1424863 (1922-08-01), Walker et al.
patent: 2176732 (1939-10-01), Faber
patent: 2769873 (1956-11-01), Noregaard
patent: 2856474 (1958-10-01), Norris
patent: 3372251 (1968-03-01), Bowman et al.
patent: 4584856 (1986-04-01), Petersdorff et al.
patent: 4644111 (1987-02-01), Hammond
Allied Electronics Catalog, 1986, p. 561.

Affiliated with

Also associated with

Rating

Key-actuated volume control does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Key-actuated volume control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Key-actuated volume control will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1761194