Signal processing device, sound wave system, and vehicle
AssigneeRohm Co., Ltd.
InventorShogo Takamura
Life of this patent
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Abstract
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.
Claims12
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.
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.
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.
Dependencies are inferred from the claim text.