Radio wave receiver and wave clock
AssigneeCasio Computer Co., Ltd.
InventorKaoru Someya
Life of this patent
Estimating the term…
Abstract
Disclosed is a radio wave receiver including: a receiving unit to receive a radio wave including a time code in which a plurality of types of data pulse different in pulse width from one another are arranged with a predetermined period of time; a detection circuit to detect the time code in the radio wave received by the receiving unit to obtain a detected signal; a low-pass filter to pass low-frequency components in the detected signal detected by the detection circuit, a cutoff frequency of the low-pass filter being twice a transmit frequency of the data pulse or less; and a data distinction unit to distinguish the types of data pulse based on an output of the low-pass filter for at least one specific point of time during a transmit period of data pulse.
Claims11
A radio wave receiver comprising:
- a receiving unit to receive a radio wave including a time code in which a plurality of types of data pulse different in pulse width from one another are arranged with a predetermined period of time;
- a detection circuit to detect the time code in the radio wave received by the receiving unit to obtain a detected signal;
- a low-pass filter to pass low-frequency components in the detected signal detected by the detection circuit, a cutoff frequency of the low-pass filter being twice a transmit frequency of the data pulse or less;
- and
- a data distinction unit to distinguish the types of data pulse based on an output of the low-pass filter for at least one specific point of time during a transmit period of data pulse.
A radio wave receiver comprising:
- a receiving unit to receive a radio wave including a time code in which a plurality of types of data pulse different in pulse width from one another are arranged with a predetermined period of time;
- a detection circuit to detect the time code in the radio wave received by the receiving unit to obtain a detected signal;
- a low-pass filter to pass low-frequency components in the detected signal detected by the detection circuit, when one of the types of data pulse which has a largest pulse is received, charges stored in the low-pass filter remaining at an end of a transmit period of the one of the types of data pulse;
- a data distinction unit to distinguish the types of data pulse based on an output of the low-pass filter for at least one specific point of time during a transmit period of data pulse;
- and
- a reset unit to remove the charges remaining in the low-pass filter every time the types of data pulse are distinguished by the data distinction unit.
Dependencies are inferred from the claim text.