Patent US3718862A successfully refreshed from Google Patents.
US3718862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wireless microphone and adapter kit
Assignee: SOUND SYST INT Inc
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Filing: 1969-06-30
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Granted: 1973-02-27
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Expires: 1989-06-30
Abstract
Abstract A wireless microphone assembly is disclosed which uses a frequency modulated transmitter having improved radiation characteristics and eliminates the need for a separate external antenna. An adapter unit is disclosed as being connectable to a conventional microphone with the adapter unit including a transmitting oscillator having its input circuit coupled with the conventional microphone output circuit via plug connectors and with the output circuit of the frequency modulated oscillator being connected via a grounding terminal to the case of the conventional microphone. The case of the conventional microphone then acts as a radiating antenna giving rise to high strength signals without the need for any protruding antenna arrangements. Mechanical construction details as well as schematic circuit diagrams are provided.
Inventors
- 👤 E Norris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:34
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/08; H04R2420/00; H04R2420/07
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
144 words
A hand-held portable microphone assembly comprising in combination: a. a conventional microphone unit including a transducer element having electric circuit means connected thereto; a housing member having said element disposed therein, and including means defining a radio frequency antenna, said housing member being a metal microphone case having an electrical ground lead connected thereto with the case serving as the antenna means; and b. an adapter unit for said conventional microphone unit including a radio frequency transmitter having said electric circuit means connected thereto as an input circuit, a second housing member having said transmitter disposed therein means insulating said second housing member from said metal microphone case and means connecting the output circuit of the transmitter to said ground lead and to said second housing member, whereby said metal microphone case and said second housing member act as the antenna for said transmitter.
Claim 2
Dependent Claim
144 words
A hand-held portable microphone assembly comprising in combination: a. a conventional microphone unit including a transducer element having electric circuit means connected thereto; a housing member having said element disposed therein, and including means defining a radio frequency antenna, said housing member being a metal microphone case having an electrical ground lead connected thereto with the case serving as the antenna means; and b. an adapter unit for said conventional microphone unit including a radio frequency transmitter having said electric circuit means connected thereto as an input circuit, a second housing member having said transmitter disposed therein means insulating said second housing member from said metal microphone case and means connecting the output circuit of the transmitter to said ground lead and to said second housing member, whereby said metal microphone case and said second housing member act as the antenna for said transmitter.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1 including a first electrical connector assembly secured to said housing and a second connector assembly connected to said second housing member, said first and second connector assemblies being a matching pair and adapted for connection and disconnection.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 wherein said transmitter is a frequency modulated transmitter.
Claim 5
Dependent Claim
44 words
The apparatus of claim 1 including first and second inductors connected in the input circuit of said transmitter, each of said inductors being connected in series between said transducer element and said transmitter to substantially block radio frequency signals but pass audio frequency signals.
Claim 6
Dependent Claim
155 words
An adapter unit for converting a conventional hand-held microphone unit having a metal case and a transducer therein and a connector assembly including a pair of output leads connected to said transducer and a lead connected to the metal case, into a portable wireless microphone transmitter comprising: a housing member, a radio frequency transmitter disposed within said housing member having first and second signal input leads, a signal transmission output lead, and a ground lead connected to said housing member; and an electrical connector assembly having said each of said three leads connected thereto and arranged for connection to the connector assembly of the microphone unit with said output lead connected to the lead in the microphone unit which is connected to the metal case and said first and second signal input leads connected to said pair of output leads, said electrical connector assembly further including means insulating said housing member from said metal case.
Claim 7
Dependent Claim
155 words
An adapter unit for converting a conventional hand-held microphone unit having a metal case and a transducer therein and a connector assembly including a pair of output leads connected to said transducer and a lead connected to the metal case, into a portable wireless microphone transmitter comprising: a housing member, a radio frequency transmitter disposed within said housing member having first and second signal input leads, a signal transmission output lead, and a ground lead connected to said housing member; and an electrical connector assembly having said each of said three leads connected thereto and arranged for connection to the connector assembly of the microphone unit with said output lead connected to the lead in the microphone unit which is connected to the metal case and said first and second signal input leads connected to said pair of output leads, said electrical connector assembly further including means insulating said housing member from said metal case.
Claim 8
Dependent Claim
25 words
The apparatus of claim 5 including circuit means in the input circuit of said transmitter blocking radio frequency input signals and passing audio frequency signals.
Claim 9
Dependent Claim
19 words
The apparatus of claim 6 wherein said circuit means includes first and second inductors connected to said input leads.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |