Sony Corporation

Kaoru Gyotoku

Yoshitaka Miyake

Takuya Daishin

Kohei Asada

Toru Sasaki

Tooru Sasaki

Takaaki Hashimoto

Disclosed herein is a recording apparatus including: an audio signal correction block configured to execute correction for flattening the frequency characteristic of an audio signal supplied from a microphone and/or correction of the level of the audio signal; a correction control block configured to make the audio signal correction block adjust the level of the audio signal attenuate the reference value with time, and, if an audio signal with a level thereof exceeding the reference value is entered, use the absolute value of the level of the audio signal exceeding the reference value as a new reference value; and a recording block configured to record the audio signal to a recording media.

Recording apparatus, recording method, audio signal correction circuit, and program

An audio signal processing apparatus generates an audio signal having an omni-directivity in the whole circumferential direction, generates an audio signal having a directivity in the right-left direction, generates an audio signal having a directivity in the front-back direction, adds the audio signal resulting from the multiplication of the audio signal having a directivity in the whole circumferential direction by a predetermined coefficient, the audio signal resulting from the multiplication of the audio signal having a directivity in the right-left direction by a predetermined coefficient, and the audio signal resulting from the multiplication of the audio signal having a directivity in the front-back direction by a predetermined coefficient, and generates a unidirectional audio signal.

Audio signal processing apparatus, audio signal processing method and imaging apparatus

An audio signal processing apparatus includes first, second and third omni-directional microphones each of which receives sound and generates an omni-directional audio signal and which are spaced apart by a predetermined distance, a first adder section that adds audio signals generated by the first, second and third omni-directional microphones and generates an audio signal having an omni-directivity in the whole circumferential direction, a first subtractor section that subtracts audio signals generated by the first and third omni-directional microphones and generates an audio signal having a directivity in the right-left direction, a second adder section that adds audio signals generated by the first and third omni-directional microphones, a second subtractor section that subtracts an audio signal generated by the second omni-directional microphone from the audio signal added by the second adder section and generates an audio signal having a directivity in the front-back direction, and an output section that adds the audio signal resulting from the multiplication of the audio signal having a directivity in the whole circumferential direction by a predetermined coefficient, the audio signal resulting from the multiplication of the audio signal having a directivity in the right-left direction by a predetermined coefficient, and the audio signal resulting from the multiplication of the audio signal having a directivity in the front-back direction by a predetermined coefficient and generates a unidirectional audio signal.

A recording device obtains audio signals by plural microphones and records the audio signals on a recording medium. The device includes plural incorporated microphones for obtaining the audio signals; correction circuits for changing characteristics by correction parameters for the incorporated microphones, for correcting characteristics of the audio signals obtained by the incorporated microphones to a reference characteristic, and for outputting the corrected audio signals; and a recording device for recording the corrected audio signals output from the circuits on the recording medium. When an audio signal obtained by an external microphone is input to the correction circuits and recorded on the recording medium instead of all the audio signals or a part of the audio signals obtained by the plural incorporated microphones, the characteristic of a corresponding correction circuit is set by a correction parameter for the external microphone, the parameter is obtained from the external microphone, the audio signal obtained by the external microphone is corrected to the reference characteristic to produce a different corrected audio signal, and the different corrected audio signal is output.

Recording device and adjustment method of recording device

A loudspeaker apparatus includes a modulator for frequency-modulating an audio signal to a signal of a frequency band and an ultrasonic generating device adapted to be driven by the output signal of the modulator. The modulator frequency-modulates the audio signal into a first signal modulated on the basis of a an ultrasonic frequency and a source signal and a second signal modulated on the basis of the ultrasonic second frequency and an inverted version of the source signal. As the ultrasonic generating device is driven by the modulated signals, it emits an ultrasonic wave of a first frequency and an ultrasonic wave of a second frequency and the frequency component corresponding to the difference of the two frequencies provides audible sound. Since the ultrasonic generating device emits ultrasonic waves, an ultradirectivity can be realized.

Loudspeaker and method of driving the same as well as audio signal transmitting/receiving apparatus

A microphone apparatus having a first microphone for picking up a desired sound and a second microphone with directionality in which sensitivity is low to the desired sound arrival direction. A sound signal from the second microphone is supplied to a subtracting circuit through an adaptive filter. The subtracting circuit subtracts an output signal of the adaptive filter from the sound signal coming from the first microphone. A circuit is provided to adjust the adaptive filter so that the output power of the subtracting circuit is minimized. The setup implements a microphone system which is compact in size and easily provides desired directionality.

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Kanagawa, Japan

Kaoru Gyotoku