Signal processing device, sound wave system, and vehicle
A signal processing device includes a wave-transmission signal generator configured to generate a wave-transmission signal for wave transmission of a sound wave, a wave-reception signal output unit configured to output a wave-reception signal based on wave reception of a sound wave, and a reflected-wave detection unit configured to detect, based on the wave-reception signal, a reflected wave of the wave transmission that may be included in the wave reception. The wave-transmission signal includes a first signal having a first predetermined number of waves, and a second signal generated after the first signal and having a second predetermined number of waves, the second predetermined number being smaller than the first predetermined number.
1 . A signal processing device, comprising:
a wave-transmission signal generator configured to generate a wave-transmission signal for wave transmission of a sound wave;
a wave-reception signal output unit configured to output a wave-reception signal based on wave reception of a sound wave; and
a reflected-wave detection unit configured to detect, based on the wave-reception signal, a reflected wave of the wave transmission included in the wave reception,
wherein the wave-transmission signal includes a first signal having a first predetermined number of waves, and a second signal generated after the first signal and having a second predetermined number of waves, the second predetermined number being smaller than the first predetermined number, and
wherein a maximum amplitude of wave transmission corresponding to the first signal is larger than a maximum amplitude of wave transmission corresponding to the second signal.
2 . A signal processing device, comprising:
a wave-transmission signal generator configured to generate a wave-transmission signal for wave transmission of a sound wave;
a wave-reception signal output unit configured to output a wave-reception signal based on wave reception of a sound wave; and
a reflected-wave detection unit configured to detect, based on the wave-reception signal, a reflected wave of the wave transmission included in the wave reception,
wherein the wave-transmission signal includes a first signal having a first predetermined number of waves, and a second signal generated after the first signal and having a second predetermined number of waves, the second predetermined number being smaller than the first predetermined number, and
wherein the wave-transmission signal generator is configured to generate the second signal after reverberation following the first signal ends.
3 . A signal processing device, comprising:
a wave-transmission signal generator configured to generate a wave-transmission signal for wave transmission of a sound wave;
a wave-reception signal output unit configured to output a wave-reception signal based on wave reception of a sound wave; and
a reflected-wave detection unit configured to detect, based on the wave-reception signal, a reflected wave of the wave transmission included in the wave reception,
wherein the wave-transmission signal includes a first signal having a first predetermined number of waves, and a second signal generated after the first signal and having a second predetermined number of waves, the second predetermined number being smaller than the first predetermined number,
the reflected-wave detection unit is configured to detect, based on a correlation between the wave-reception signal and reference data, a reflected wave of the wave transmission included in the wave reception, and
wherein a frequency of the first signal and a frequency of the second signal are different from each other.
4 . A sound wave system, comprising:
the signal processing device according to claim 1 ; and
a sound-wave transmission reception device configured to be directly or indirectly connected to the signal processing device.
5 . A vehicle comprising the sound wave system according to claim 4 .
6 . A sound wave system, comprising:
the signal processing device according to claim 3 ; and
a sound-wave transmission reception device configured to be directly or indirectly connected to the signal processing device.
7 . A vehicle comprising the sound wave system according to claim 6 .
8 . A sound wave system, comprising:
the signal processing device according to claim 6 ; and
a sound-wave transmission reception device configured to be directly or indirectly connected to the signal processing device.
9 . A vehicle comprising the sound wave system according to claim 8 .
10 . The signal processing device according to claim 3 , further comprising a determination unit,
wherein the determination unit is configured
to determine a time period from the wave transmission corresponding to the second signal until detection of the reflected wave corresponding to the second signal in a case where the reflected wave corresponding to the second signal has been detected by the reflected-wave detection unit, and
to determine a time period from the wave transmission corresponding to the first signal until detection of the reflected wave corresponding to the first signal in a case where the reflected wave corresponding to the second signal has not been detected but the reflected wave corresponding to the first signal has been detected by the reflected-wave detection unit.
11 . A sound wave system, comprising:
the signal processing device according to claim 10 ; and
a sound-wave transmission reception device configured to be directly or indirectly connected to the signal processing device.
12 . A vehicle comprising the sound wave system according to claim 11 .