Receiving portion of radio communication device

H - Electricity – 04 – B

Patent

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Details

H04B 1/16 (2006.01) H04B 17/00 (2006.01) H04M 1/73 (2006.01) H04Q 7/32 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2220258

A receiving portion of a radio communication device includes a circuit periodically moving into a sleep mode of operation. The circuit periodically moves out of the sleep mode of operation in response to a re-activation signal. A first clock signal is generated. Clock pulses in the first clock signal are counted. The re-activation signal is generated each time the number of the counted clock pulses in the first clock signal reaches an updatable number. A second clock signal is generated which has a frequency higher than a frequency of the first clock signal. Clock pulses in the second clock signal are counted during every time interval determined by the first clock signal. An error of the frequency of the first clock signal with respect to the frequency of the second clock signal is calculated on the basis of a result of the counting of clock pulses in the second clock signal. The updatable number is set in response to the calculated error of the frequency of the first clock signal.

La partie réceptrice d'un dispositif de communication radio comprend un circuit qui passe périodiquement en mode de fonctionnement dit de veille. Le circuit quitte périodiquement le mode de veille en réponse à un signal de relance. Un premier signal d'horloge est émis. Les impulsions d'horloge du premier signal d'horloge sont comptées. Le signal de réactivation est émis chaque fois que le nombre des impulsions d'horloge comptées atteint un nombre actualisable. Un deuxième signal d'horloge est ensuite émis; sa fréquence est supérieure à celle du premier signal d'horloge. Les impulsions d'horloge du deuxième signal d'horloge sont comptées au cours de chaque intervalle de temps déterminé par le premier signal d'horloge. Une erreur de la fréquence du premier signal d'horloge, quant à la fréquence du deuxième signal d'horloge, est calculée en fonction du compte des impulsions d'horloge durant le deuxième signal d'horloge. Le nombre actualisable est établi en réponse à l'erreur calculée concernant la fréquence du premier signal d'horloge.

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