Communication device utilizing channel based oscillator...

Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C455S192200, C455S255000, C455S259000

Reexamination Certificate

active

06704556

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates in general to communication devices having an oscillator, and more specifically to a communication device having channel based oscillator aging compensation.
2. Description of the Related Art
Communication devices, such as cellular telephones, pagers, and fixed station transceivers are widely used today. All such communications devices share one common problem, over time drift of the oscillator which controls channel frequency, can lead to unintelligible communications, and in the extreme, complete failure to receive information being transmitted over a radio frequency channel. This problem is especially problematic for communication devices used in unattended locations that are used to provide remote monitoring of operating equipment or to provide security for a facility. As a result, such communication devices have to be periodically checked by a trained serviceman, and the oscillator retuned, should the oscillator have drifted off frequency. The problem can be alleviated to some extent through the used of high stability oscillators, which would extended the time interval between which checking the oscillator is performed, but such oscillators are often costly, and do not necessarily justify the added expense to the communication device.
What is needed is a method and apparatus by which communication devices having relatively low stability oscillators can be regularly adjusted without the intervention of the user of the device.


REFERENCES:
patent: 4901036 (1990-02-01), Herold et al.
patent: 5109544 (1992-04-01), Mittel et al.
patent: 5115515 (1992-05-01), Yamamoto et al.
patent: 5493710 (1996-02-01), Takahara et al.
patent: 5566213 (1996-10-01), Carsello
patent: 5625351 (1997-04-01), Willard et al.
patent: 6108525 (2000-08-01), Takemura

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Communication device utilizing channel based oscillator... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Communication device utilizing channel based oscillator..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communication device utilizing channel based oscillator... will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3200826

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.