摘要:
A sound reproduction device includes a superdirective speaker having a first surface, and an attachment part having a second surface opposed to the first surface. The first surface has a convex face, and the second surface has a concave face which can come into contact with the convex face. A curvature of the convex face is set larger than that of the concave face. A direction of emitting a sound wave of the superdirective speaker can be adjusted by making the convex face move along the concave face.
摘要:
A sound reproducing device includes parametric speakers disposed to a display, a loudspeaker, drivers, a human-body sensor, and a controller. The loudspeaker has a wider directivity than the parametric speakers. The drivers change directions of the parametric speakers, respectively. The parametric speakers and the drivers constitute at least two parametric speaker units each composed of respective one of the parametric speakers and respective one of the drivers. The controller reproduces sound information based the number of persons in front of the display detected from an output from the human-body senor. The sound reproducing device reduces the possibility for a number of persons to hear the sound noisily, and allows drawing more attention to the content, e.g. an advertisement.
摘要:
A sound reproducing device includes parametric speakers disposed to a display, a loudspeaker, drivers, a human-body sensor, and a controller. The loudspeaker has a wider directivity than the parametric speakers. The drivers change directions of the parametric speakers, respectively. The parametric speakers and the drivers constitute at least two parametric speaker units each composed of respective one of the parametric speakers and respective one of the drivers. The controller reproduces sound information based the number of persons in front of the display detected from an output from the human-body senor. The sound reproducing device reduces the possibility for a number of persons to hear the sound noisily, and allows drawing more attention to the content, e.g. an advertisement.
摘要:
An sound reproducing apparatus is configured such that a correction amount is calculated on the basis of a masking model, determiner for determining a correction parameter correcting input signal so as to be natural for human ears to hear on the basis of the calculated correction amount is provided, and a characteristic of correction filter is changed on the basis of a result of determiner when inputting vehicle speed information.
摘要:
In a sound reproducing apparatus, part of a frequency band where mode-coupled vibration can be excited is regarded as a carrier frequency. A frequency of mode coupling, with a low rate of change in vibration displacement with respect to the frequency, is regarded as a carrier signal so that a signal in an audible band which is outputted from an audible band signal source can be demodulated and reproduced with stable sound pressure in a broad frequency band.
摘要:
The sound reproducing apparatus for use with a signal source comprises, a first output unit connected to the signal source via a first power amplifier, a first phase shifter connected to the signal source, a second output unit connected to the first phase shifter via a second power amplifier, a second phase shifter connected to the signal source, a third output unit connected to the second phase shifter via a third power amplifier, a fourth phase shifter connected to a third phase shifter, and a fourth output unit connected to the fourth phase shifter via a fourth power amplifier, wherein the first output unit and the second output unit are in right and left relation with each other, the third output unit and the fourth output unit are in right and left relation with each other, a group of the first output unit and the second output unit and a group of the third output unit and the fourth output unit are in front and rear relation with each other. The vehicle is equipped with the sound reproducing apparatus. In this way, it is possible to obtain a sound reproducing apparatus improved in sound quality and a vehicle using the sound reproducing apparatus.
摘要:
A drunk driving detection system to be incorporated in a vehicle includes a steering wheel, a film, a pair of contact detection electrodes, an alcohol sensor, and a control circuit. The steering wheel is provided with an opening in a portion to be grasped by a driver. The film is liquid-impermeable and air-permeable, and covers the first opening. The contact detection electrodes are provided on the film. The alcohol sensor is provided in a space in communication with the opening. The control circuit is connected to the contact detection electrodes and the alcohol sensor, and measures the resistance between the contact detection electrodes. When the resistance is within a predetermined range, the control circuit determines that the driver is in contact with the film and detects an alcohol drinking condition of the driver based on the output from the alcohol sensor.
摘要:
In a sound reproducing apparatus, a target control value is determined automatically from a noise and a sound radiated from a loudspeaker unit, and a volume of a reproduced sound is naturally compensated according to an amount of the noise against a masking due to a noise at a listening point. A first microphone is located near a loudspeaker box, and a second microphone is located in the loudspeaker box. A gain of s variable gain amplifier is changed so that an integrated value of a signal obtained by filtering and adding the outputs of the microphone may be equal to an integrated value of the filtered signal of the output of the variable gain amplifier.
摘要:
A signal produced by a speaker is removed from a totaled sound of noise around the speaker and the signal from the speaker, thereby extracting correctly the noise around. This structure allows an audio reproducing apparatus of the present invention to masking compensation more naturally. This audio reproducing apparatus includes a detecting coil (17) disposed on a bobbin (16) of the speaker (13), and a microphone (15) disposed around the speaker (13). An output signal from the detecting coil (17) and an output signal from the microphone (15) are respectively filtered, and then undergo an adding process. An input signal is adjusted its magnitude based on these processed signals.
摘要:
The object of the present invention is to offer an sound reproduction apparatus equipped with a speaker having a drastically improved acoustic characteristics securing a stable and high S/N ratio over a wide frequency range. In order to accomplish these objects, the inputted audio signal is amplified by a power amplifier and is reproduced in an acoustic output by driving a speaker, and the reproduced acoustic output is detected by a microphone disposed in a closed cabinet together with said speaker and the detected signal is amplified by a microphone amplifier and is processed by a filter. Then, the output signal from said filter and the input signal to said power amplifier are added and processed, and the difference signal between the added signal and said inputted audio signal is used as an input signal to said power amplifier constituting a negative feedback circuit accomplishing the objects of this invention.