Abstract: A vehicle proximity notification device that notifies proximity of a vehicle by causing a speaker disposed outside a vehicle interior of the vehicle to output a warning sound. The vehicle proximity notification device includes: a controller that, when a sound pressure of a sound collected by a microphone disposed outside the vehicle interior exceeds a first threshold, sets a sound pressure of the warning sound output by the speaker to a level lower than the sound pressure of the warning sound output by the speaker when the sound pressure of the sound collected by the microphone is lower than or equal to the first threshold.

Abstract: A vehicle proximity notification device that notifies proximity of a vehicle by causing a speaker disposed outside a vehicle interior of the vehicle to output a warning sound. The vehicle proximity notification device includes: a controller that, when a sound pressure of a sound collected by a microphone disposed outside the vehicle interior exceeds a first threshold, sets a sound pressure of the warning sound output by the speaker to a level lower than the sound pressure of the warning sound output by the speaker when the sound pressure of the sound collected by the microphone is lower than or equal to the first threshold.

Abstract: Provided is a sound reproduction device that can accurately adjust a warning sound output from a loudspeaker. The sound reproduction device includes a loudspeaker unit including a loudspeaker and an identifier that identifies a characteristic of the loudspeaker and an amplifier unit that amplifies a signal corresponding to a sound output from the loudspeaker. The amplifier unit includes an amplifier that amplifies the signal input from a sound source and outputs the amplified signal to the loudspeaker, a determination unit, and an amplification degree adjuster. When the loudspeaker unit and the amplifier unit are connected to each other, the determination unit determines the characteristic of the loudspeaker from the identifier of the connected loudspeaker unit. The amplification degree adjuster adjusts the amplification degree of the signal output from the amplifier according to the characteristic of the loudspeaker determined by the determination unit.

Abstract: A sound output device is configured to be installed in a vehicle. The sound output device includes a driving-status detector for detecting a driving status of the vehicle, a sound signal generator for generating a reference signal in response to the detected driving status, first and second units for processing the generated reference signal, first and second sound output parts for outputting the reference signals processed by the first and second units. The first unit includes a phase shifter for shifting a phase of the reference signal such that the reference signals output from the first sound output part and the second sound output part have a phase difference between the respective reference signals. This sound output device allows a passenger at a predetermined position to hear the sound in a preferable condition.

Abstract: A sound output device is configured to be installed in a vehicle. The sound output device includes a driving-status detector for detecting a driving status of the vehicle, a sound signal generator for generating a reference signal in response to the detected driving status, first and second units for processing the generated reference signal, first and second sound output parts for outputting the reference signals processed by the first and second units. The first unit includes a phase shifter for shifting a phase of the reference signal such that the reference signals output from the first sound output part and the second sound output part have a phase difference between the respective reference signals. This sound output device allows a passenger at a predetermined position to hear the sound in a preferable condition.