The present technology relates to a signal processing device, a signal processing method, and a program that can provide sound with more increase in realistic sense by restoring a difference of sound pressure between sound sources. The signal processing device includes: an acoustic signal obtaining unit that obtains an acoustic signal; a sound source positional information obtaining unit that obtains sound source positional information relating to a distance between a sound source and a sound collecting unit that collects sound from the sound source; a listening positional information obtaining unit that obtains listening positional information relating to a distance between a reproducing device that reproduces the acoustic signal and a listener who listens to sound reproduced by the reproducing device; and a correcting unit that corrects gain of the acoustic signal on a basis of the sound-source positional information and the listening positional information. The present technology can be applied to, e.g., a TV telephone system.

An optical safety sensor is inexpensively implemented. An optical safety sensor includes: a plurality of light projectors/receivers (a first light projector/receiver and a second light projector/receiver), which includes light projecting portions and light receiving portions; distance measurement portions, which measure distances using the time from light projecting to light receiving; and detection portions, which detect, based on measurement results, an abnormality occurring in any one of the plurality of light projectors/receivers; each of the light receiving portion provided in the plurality of light projectors/receivers receives reflected light caused by the light projected from the light projecting portions of all the plurality of light projectors/receivers.

An optical safety sensor is inexpensively implemented. An optical safety sensor includes: a plurality of light projectors/receivers (a first light projector/receiver and a second light projector/receiver), which includes light projecting portions and light receiving portions; distance measurement portions, which measure distances using the time from light projecting to light receiving; and detection portions, which detect, based on measurement results, an abnormality occurring in any one of the plurality of light projectors/receivers; each of the light receiving portion provided in the plurality of light projectors/receivers receives reflected light caused by the light projected from the light projecting portions of all the plurality of light projectors/receivers.

The system (100) for positioning an underwater device (105, 110, 115, 120), comprises: at least two surface transponders (125, 130, 135) comprising a receiver (160) for receiving radio signals transmitted by a geolocation system (200); each surface transponder comprising: a means (180) for estimating at least one radio pseudo-distance; an attachment (185) to a float; and a means (140) for communicating information representative of the radio pseudo-distances; and an underwater acoustic transmitter (140); the underwater device comprising: a means (145) for receiving information representative of the radio pseudo-distances; an acoustic signal receiver (145); a means (150) for determining one or more acoustic pseudo-distances between at least two underwater acoustic transmitters and the underwater device; and a means (155) for calculating the position of the device in a terrestrial frame of reference centered on one of the surface transponders.

The system (100) for positioning an underwater device (105, 110, 115, 120), comprises: at least two surface transponders (125, 130, 135) comprising a receiver (160) for receiving radio signals transmitted by a geolocation system (200); each surface transponder comprising: a means (180) for estimating at least one radio pseudo-distance; an attachment (185) to a float; and a means (140) for communicating information representative of the radio pseudo-distances; and an underwater acoustic transmitter (140); the underwater device comprising: a means (145) for receiving information representative of the radio pseudo-distances; an acoustic signal receiver (145); a means (150) for determining one or more acoustic pseudo-distances between at least two underwater acoustic transmitters and the underwater device; and a means (155) for calculating the position of the device in a terrestrial frame of reference centered on one of the surface transponders.

A positioning system includes a radio frequency (RF) device, a microphone array, and a calculation device. The RF device is configured to transmit an RF signal to an external device for pairing with the external device. The microphone array is configured to receive an audio signal transmitted from the external device after the positioning system is paired with the external device. The calculation device is configured to calculate a direction from the positioning device to the external device based on a time interval of the audio signal received by the microphone array, and configured to calculate a distance between the positioning system and the external device based on the audio signal transmitted by the external device after pairing. The calculation device is configured to position a location of the external device according to the direction and the distance.

A positioning system includes a radio frequency (RF) device, a microphone array, and a calculation device. The RF device is configured to transmit an RF signal to an external device for pairing with the external device. The microphone array is configured to receive an audio signal transmitted from the external device after the positioning system is paired with the external device. The calculation device is configured to calculate a direction from the positioning device to the external device based on a time interval of the audio signal received by the microphone array, and configured to calculate a distance between the positioning system and the external device based on the audio signal transmitted by the external device after pairing. The calculation device is configured to position a location of the external device according to the direction and the distance.

A system and method for determining the position and orientation of a wearable audio device, for example, methods and systems for determining the position, orientation, and/or height of a wearable audio device using acoustic beacons. In some examples, the determined position, orientation, and/or height can be utilized to correct for drift experienced by an inertial measurement unit (IMU). In other examples, the drift may cause am externalized or virtualize audio source, generated within a known environment, to move or drift relative to the known locations of physical audio sources within the environment. Thus, the systems and methods described herein can be utilized to correct for drift in the position of a virtual audio source with respect to the wearable audio device by first determining its own absolute position and orientation within the environment.

The present disclosure relates to an acoustic position determination system that includes a mobile communication device and at least one base transmitter unit. The mobile communication device is configured to transmit and receive acoustic signals. Due to relative movements between the mobile communication device and the base transmitter unit, frequencies of the received signals shift due to Doppler effect. The mobile communication device is configured to compensate Doppler frequency shifts in the received acoustic signals prior to performing a deconvolution decoding process. The mobile communication device is further configured to compensate Doppler frequency shifts and perform deconvolution decoding process on acoustic signals received from multiple signal transmission paths.

The present disclosure relates to an acoustic position determination system that includes a mobile communication device and at least one base transmitter unit. The mobile communication device is configured to transmit and receive acoustic signals. Due to relative movements between the mobile communication device and the base transmitter unit, frequencies of the received signals shift due to Doppler effect. The mobile communication device is configured to compensate Doppler frequency shifts in the received acoustic signals prior to performing a deconvolution decoding process. The mobile communication device is further configured to compensate Doppler frequency shifts and perform deconvolution decoding process on acoustic signals received from multiple signal transmission paths.