Transducer switching system
US4028491A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1976 |
| Grant date | Jun 7, 1977 |
| Priority date | — |
| Expiry date | Apr 2, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/345
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transducer switching system for, in effect, removing electrical energy from a transducer without breaking the electrical circuit. A resistor is in series with the transducer. An electro-mechanical switch shunts the resistor. The switch is within the enclosure containing the transducer. When the acoustic connector of a use-element, such as a stethoscope type headset for a listener, is inserted into the enclosure the switch is changed from its normally open state to a closed state, thereby shorting out the resistor and allowing an effective level of electrical power to operate the transducer. Two systems may be simultaneously actuated for stereophonic sound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.