Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2003-04-11
2008-10-07
Tsang, Fan (Department: 2614)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S574000
Reexamination Certificate
active
07433709
ABSTRACT:
The invention provides for a mobile radio communications device having a first crystal oscillator for providing a first master clock frequency for a timebase of a first communication system, a second crystal oscillator for providing a second master clock frequency for a timebase for a second communication system, a third oscillator for providing a relatively low frequency clock signal within the device, and means for calibrating each of the first and second master clock signals to the third oscillator clock signal, means for determining the ratio of the first and second master clocks on the basis of respective measurements of the first and second master clocks to the relatively low frequency clock signal.
REFERENCES:
patent: 6766149 (2004-07-01), Hikita et al.
patent: 2003/0043766 (2003-03-01), McDonough et al.
patent: 2 320 398 (1998-06-01), None
patent: 2000-188522 (2000-07-01), None
patent: 2000-252968 (2000-09-01), None
Translation of relevant portions of Japanese Office Action issued on Jul. 16, 2008 in connection with corresponding Japanese Patent Application No. 2003-107275.
Nec Corporation
Ostrolenk Faber Gerb & Soffen, LLP
Sing Simon
Tsang Fan
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