Very low power cordless headset system

Patent 5568516 Issued on October 22, 1996. Estimated Expiration Date:

October 3, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Cordless transmitting and receiving apparatus
Patent #: 4462113
Issued on: 07/24/1984
Inventor: Iwata

Cordless communications system
Patent #: 4584707
Issued on: 04/22/1986
Inventor: Goldberg , et al.

Electronic data collection system
Patent #: 5054112
Issued on: 10/01/1991
Inventor: Ike

Energy recovering hearing system
Patent #: 5276910
Issued on: 01/04/1994
Inventor: Buchele

Contactless linking device for interconnecting data bus sections Patent #: 5293400
Issued on: 03/08/1994
Inventor: Monod, et al.

Inventors

Assignee

Phonic Ear Incorporated

Application

No. 316920 filed on 10/03/1994

US Classes:

375/259, SYSTEMS USING ALTERNATING OR PULSATING CURRENT375/219, TRANSCEIVERS375/258, Transformer coupling381/163, Having bi-directional transducer455/41.1Near field (i.e., inductive or capacitive coupling)

Examiners

Primary: Chin, Stephen
Assistant: Ghebretinsae, T.

Attorney, Agent or Firm

Graham & James LLP

International Class

H04L 027/00

Abstract

A cordless headset, requiring very low power using Time Variant Modulation (TVM) for reception of a magnetic signal and TVM of RF or infrared as the transmitter. The headset area or zone of operations is defined by the magnetic field that the headset operates within and uses a handshake protocol that takes advantage of the TVM fixed clock period. The headset communicates with a base station that includes a TVM transmitter and loop for transmitting a TVM signal to the cordless headset, and a RF or infrared receiver capable of receiving TVM signals from the headset. The base station also contains the headset protocol logic for controlling the headset transmission. The headset and base station receiver can both be fixed, mobile or portable and vary with respect to orientation and distance from each other. The receiver circuits in both base station and headset automatically adjust to the variance in signal strength.