Electronic device, control method of electronic device, and control program of electronic device
An electronic device includes a controller that performs control to enable switching between a first band mode such that a transmission wave is in a first band and a second band mode such that the transmission wave is in a second band broader than the first band. The controller performs control to switch to the second band mode when an object is detected within a predetermined distance in the first band mode.
1. An electronic device comprising:
a transmitter configured to transmit a transmission wave; and
a controller configured to perform control to enable switching between a first band mode such that the transmission wave is in a first band and a second band mode such that the transmission wave is in a second band broader than the first band;
wherein the controller is configured to:
detect whether an object is within a predetermined distance,
switch to the second band mode upon detecting that the object is within the predetermined distance while in the first mode,
remain in the second band mode for an entire duration the object is detected as being within the predetermined distance,
measure a distance to the object based on a beat signal obtained from a signal transmitted as the transmission wave and a signal received as a reflected wave, the reflected wave being a portion of the transmission wave reflected by the object, and
judge that the object is detected within the predetermined distance when a ratio between a peak in a frequency spectrum obtained based on the beat signal and an average noise intensity excluding the peak in the frequency spectrum exceeds a predetermined threshold.
2. The electronic device of claim 1 , wherein millimeter waves with a bandwidth of 1 gigahertz are transmitted as the transmission wave in the first band mode.
3. The electronic device of claim 1 , wherein millimeter waves with a bandwidth of 4 gigahertz are transmitted as the transmission wave in the second band mode.
4. The electronic device of claim 1 , wherein in the first band mode, the controller is configured to set the first band of the transmission wave transmitted from a plurality of transmitters to a different band for each transmitter.
5. The electronic device of claim 4 , wherein in the first band mode, the controller is configured to set the first band of the transmission wave transmitted from the plurality of transmitters to a different band in accordance with a direction of transmission of the transmission wave.
6. The electronic device of claim 5 , wherein the controller is configured to judge the direction of transmission of the transmission wave based on a direction detected by a direction detector.
7. A control method comprising:
transmitting a transmission wave; and
performing control to enable switching between a first band mode such that the transmission wave is in a first band and a second band mode such that the transmission wave is in a second band broader than the first band;
wherein the control includes:
detecting whether an object is within a predetermined distance,
switching to the second band mode upon detecting that the object is within the predetermined distance while in the first mode,
remaining in the second band mode for an entire duration the object is detected as being within the predetermined distance
measuring a distance to the object based on a beat signal obtained from a signal transmitted as the transmission wave and a signal received as a reflected wave, the reflected wave being a portion of the transmission wave reflected by the object, and
judging that the object is detected within the predetermined distance when a ratio between a peak in a frequency spectrum obtained based on the beat signal and an average noise intensity excluding the peak in the frequency spectrum exceeds a predetermined threshold.
8. A non-transitory computer-readable recording medium that stores a control program, the control program configured to control an electric device to execute processes of:
transmitting a transmission wave; and
performing control to enable switching between a first band mode such that the transmission wave is in a first band and a second band mode such that the transmission wave is in a second band broader than the first band;
wherein the control includes:
detecting whether an object is within a predetermined distance,
switching to the second band mode upon detecting that the object is within the predetermined distance while in the first mode,
remaining in the second band mode for an entire duration the object is detected as being within the predetermined distance
measuring a distance to the object based on a beat signal obtained from a signal transmitted as the transmission wave and a signal received as a reflected wave, the reflected wave being a portion of the transmission wave reflected by the object, and
judging that the object is detected within the predetermined distance when a ratio between a peak in a frequency spectrum obtained based on the beat signal and an average noise intensity excluding the peak in the frequency spectrum exceeds a predetermined threshold.