Radio Wave Receiving Device Frequency Switching Circuit
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Solution Overview
Problem
Radio wave watches struggle to receive time data in environments where standard waves are difficult to access, leading to interference issues when using repeaters, and require complex circuitry to handle multiple frequency reception systems.
Innovation Solution
A radio wave receiving device that switches reception frequency to an intermediate frequency when standard waves are not received, allowing for direct detection of relayed radio waves without synthesizing with a local oscillation signal, enabling reception of multiple frequencies with a simple structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a repeater transmits the standard wave through relayed radio wave at the same frequency, then the time data can be relayed, but the relayed radio wave superposes on the original standard wave and may damage the original signal when out of phase
Solution Approach 1:
The patent changes the frequency parameter of the relayed radio wave from the original standard wave frequency to a different frequency (intermediate frequency). This parameter change allows the relayed signal to be transmitted without superposing on the original standard wave, thereby eliminating the harmful interference while maintaining the relay capability.
2Adaptability or versatility
If the radio wave watch uses a super-heterodyne system to receive both standard wave and relayed radio wave, then multiple frequencies can be received, but the local oscillation signal frequency must be changed according to reception frequency
Solution Approach 1:
The patent makes the reception system dynamic by allowing switching between different reception modes (standard wave reception and relayed radio wave reception). The system can adapt its operating frequency based on the reception requirements, enabling multi-frequency reception without requiring complex frequency switching mechanisms for the local oscillation signal.
3Ease of manufacture
If the radio wave watch receives relayed radio wave at intermediate frequency, then the relayed signal can be detected directly, but the local oscillation signal output must be temporarily stopped
Solution Approach 1:
The patent implements periodic switching between different reception modes. When receiving relayed radio waves at intermediate frequency, the local oscillation signal is temporarily stopped, and when switching to standard wave reception, the local oscillation signal is restarted. This periodic action allows the system to maintain circuit simplicity while enabling reliable reception of both signal types.
Data Source
AI summary
A frequency switching signal for switching a reception frequency of an antenna based on a reception success or failure signal output from a detection circuit and a standard time code output from a demodulator is output to a reception frequency selection circuit. The reception frequency is switched to the frequency which is the same as an intermediate frequency other than that of the standard radio waves, and at the same time, an output temporarily stopping signal is output to a local oscillation circuit to temporarily stop the output of a local oscillation signal of the local oscillation circuit, enabling to output the reception signal which was received by the antenna as the intermediate frequency signal without synthesizing and converting it in the frequency conversion circuit to be detected by a detection circuit.Thereby, the reception of the radio wave composed of a plurality of frequencies can be realized with a simple structure.