Abstract: An audio processing apparatus has converting means for converting n-channel (positive integral number: n?1) audio signals input from at least one sound source into two-channel signals, a pair of correcting filter means to which a pair of two-channel signals converted by the converting means are supplied and which corrects a difference of the sense of hearing due to a difference of headphone characteristics, and an output section for supplying a pair of output signals from the pair of correcting filter means to right and left speaker units of a headphone.

Abstract: A distributing circuit distributes audio signals of a predetermined number of channels to audio signals of a predetermined number of channels. A first signal processing circuit processes audio signals that are output from the distributing circuit in parallel, reproduces the resultant signals with a plurality of speakers, and localizes sound images of the individual audio signals at predetermined positions. A second signal processing circuit inputs audio signals that are output to the plurality of speakers and performs signal processes equivalent to the transfer functions from the individual speakers to both the ears of the listener. The output signals of the second signal processing circuit are reproduced with the headsets.

Abstract: This invention is directed to a transmitting apparatus adapted for carrying out transmission of audio signals by using infrared rays and a reproducing apparatus using a headphone device adapted to receive audio signals transmitted from the transmitting apparatus to reproduce them. The transmitting apparatus allows digital audio signal to undergo time axis compression every unit time period, and to repeat the same contents to transmit such repetitive signals by infrared rays. The headphone device comprises a light receiving element for receiving infrared rays, and a memory adapted so that valid signals of the received repetitive signals are written thereinto and the written signals are caused to undergo time axis expansion and are read out therefrom to allow the signals which have been read out from the memory to undergo D/A conversion to deliver the signals thus obtained to speaker units of the headphone device to reproduce them.

Abstract: An audio processing apparatus has converting means for converting n-channel (positive integral number: n?1) audio signals input from at least one sound source into two-channel signals, a pair of correcting filter means to which a pair of two-channel signals converted by the converting means are supplied and which corrects a difference of the sense of hearing due to a difference of headphone characteristics, and an output section for supplying a pair of output signals from the pair of correcting filter means to right and left speaker units of a headphone.

Abstract: An audio processing apparatus has a converter for converting n-channel (positive integral number: n?1) audio signals input from at least one sound source into two-channel signals, a pair of correcting filters to which a pair of two-channel signals converted by converter are supplied and which correct a difference of the sense of hearing due to a difference of headphone characteristics, and an output section for supplying a pair of output signals from the pair of correcting filters to right and left speaker units of a headphone.

Abstract: A headphone device having the function of detecting the head turning angle, in which attempts to realize sound image localization in the forward direction and that in the rear direction simultaneously does not result in the impulse response processing becoming voluminous. If a headphone 7 experiences a rotary movement, a rotational angular velocity sensor 8, mounted on a headband 7a, outputs a voltage proportionate to the angular velocity. The output voltage is filtered by a bandwidth limiting filter 9 and encoded by an A/D converter 10 to enter a micro-processor 11. The output signal of the A/D converter 10, entering the micro-processor 11, is sampled at a pre-set time interval and integrated so as to be converted into angular data. A rotational angle for actually localizing the sound image is calculated from the angular data and corresponding signal processing data is transmitted to a digital signal processing circuit 4.

Abstract: An audio reproducing unit 2 has a audio signal processor 5 responsive to results of detection by a turning angular velocity sensor 16 for carrying out calculations for localizing the input audio outside the head of a wearer of a head attachment unit 15, for preventing the sound image orientation from following head turning movement and for setting the sound image orientation in a pre-set direction in the viewing/hearing environment of the wearer. The image reproducing unit 10 has an image signal processor 12 for setting the input image in a pre-set orientation in the viewing/hearing environment of the wearer responsive to the results of detection by the turning angular velocity sensor 16.

Abstract: According to the present invention, when an audio signal is reproduced through headphones, the same localization, sound field and so on as those obtained when the sound is reproduced by loudspeakers located in a predetermined relationship upon reproduction of the sound by the loudspeakers can be obtained. Particularly, gyration of a head of a listener is detected by using a vibratory gyroscope suitable for detection of the gyration of the head. Even when a vibratory gyroscope (175A), (175B) or (175C) is attached to an attachment position which is a head band (177) of a headphones (170) or a left arm (17L) or a right arm (17R) thereof, it is possible to detect the gyration of the head of the listener.

Abstract: An object of the present invention is to provide a video signal and audio signal reproducing apparatus in which a sound image reproduced from an audio signal is localized so as to correspond to a picture and a listener can change a positional information thereon. According to the present invention, a real sound image is determined at a position, of objects 117, 118 and 119 on a screen 116 of a TV monitor 115, from which a beam of a position corresponding to a sound source position changed by a position information changer 93. It is possible to form the real sound image on the TV monitor 115 as if a sound was emanated from a position of an image which was displayed on the screen 116 of the TV monitor 115 and corresponded to a changed sound source position.

Abstract: An object of the present invention is to provide an audio reproducing apparatus which makes a radiation impedance from an inlet of an external auditory canal of a listener to an outside approximate to that obtained when the listener does not put the apparatus, facilitates localization of a reproduced sound image, and allows the listener to feel more comfortable when putting the apparatus on the head. Headphone units (120) of a headphone are disposed so as to be opposed to both the left and right ears (23a), (23b) of a listener (23). Planes of the headphone units (120) opposed to both the left and right ears (23a), (23b) of the listener (23) are provided with being inclined at a predetermined angle forward or backward so as not to be perpendicular to a straight line passing the centers of both the left and right ears (23a), (23b) of the listener (23).

Abstract: A signal input at an input terminal (1) is divided into signals of two systems, and the signal of one system is supplied to a low-pass filter (2) and then fed to a downsampling processor (3). The downsampled signal is superimposed with an impulse response of a characteristic to be realized by an FIR filter (4), and outputted to an oversampling LPF (5), wherein a sampling frequency thereof is matched with a sampling signal of an inputted signal. The other signal of the second system of the two systems is extracted only as a high-band signal by a high-pass filter (6). The high-band signal is added to the output of the LPF (5) by an adder (7), and outputted from an output terminal (8). Thus, an accurate frequency response can be reproduced by use of an FIR filter with a short tap length.

Abstract: According to the present invention, when an audio signal is reproduced through headphones, the same localization, sound field and so on as those obtained when the sound is reproduced by loudspeakers located in a predetermined relationship upon reproduction of the sound by the loudspeakers can be obtained. Particularly, gyration of a head of a listener is detected by using a vibratory gyroscope suitable for detection of the gyration of the head. Even when a vibratory gyroscope (175A), (175B) or (175C) is attached to an attachment position which is a head band (177) of a headphones (170) or a left arm (17L) or a right arm (17R) thereof, it is possible to detect the gyration of the head of the listener.

Abstract: A digital filter is composed of an FIR filter with a finite tap length and a feedback section. An apparatus for reproducing sound is arranged to use the digital filter. In the feedback section, an output of one of a plurality of delaying units included in the FIR filter is attenuated through the effect of a coefficient multiplier. The attenuated output is fed back to an adder located between adjacent delaying units arranged before the one delaying unit. The feedback section repeats the feedback operation to generate an infinitely continuing impulse response.

Abstract: A vibration type gyroscope apparatus of digital type which is good in operability and high in detection accuracy includes a variable gain amplifier (3), for amplifying a detection signal of a vibration type gyroscope, and an analog to digital converter (5), for converting an output signal of the variable gain amplifier (3) into a digital signal, are integratedly contained in the vibration type gyroscope apparatus. Accordingly, the detection signal is amplified and converted into a digital signal at a range as near as possible to a vibration type gyroscope (1) to thereby prevent the detection signal from being deteriorated by the influence of external noise in a transmission line. Accordingly, the transmission line can be used effectively, so that the signal can be transmitted at high-grade and high-fidelity.

Abstract: Audio reproducing apparatus reproducing an audio signal corresponding to a picture which localizes a sound image in a direction corresponding to the picture by processing an audio signal in a real-time fashion is supplied with an audio signal from a general-purpose signal source such as a laser disc a digital vibratory gyroscope detects a rotational angle of a listener's head. In response to the detected rotational angle, the audio reproducing apparatus subjects the audio signal to a predetermined signal processing in a real-time fashion. Thus, a sound image is localized in the direction corresponding to the picture projected on a screen from a projector.

Abstract: To provide an audio reproduction apparatus can save the capacity of a memory, can process audio signals quickly depending on the movement of the head of a listener, and is not affected by conditions in which sounds are picked up, digital audio signals in respective channels from a multichannel digital stereophonic signal source 1, or digital audio signals in respective channels which are converted by A/D converters 3 from analog signals that are inputted to an analog stereophonic signal source 2, and a set of impulse responses digitally recorded in a memory 35 based on an angle of the head of a listener 23 with respect to a reference position, the impulse responses containing corrective characteristics of sound sources and headphones used to measure the impulse responses, are subjected to convolutional integration on a real-time basis by convolutional integrators 5, 7, 9, 11.

Abstract: A sound collecting system and a sound reproducing apparatus by means of which an actual audio image can be reproduced. The sound collecting system includes a plurality of microphones for producing sound signals and a plurality of position detecting apparatus for detecting locations of the microphones and/or positions of sound sources to produce position signals. The sound signals and the position signals are multiplexed by a plurality of multiplexers, and the multiplexed signals are stored into respective audio channels or different channels by a signal recording apparatus. The multiplexing may be performed by a frequency multiplexing method, a time division multiplexing method or the like. Since also position information is stored into corresponding audio channels together with acoustic sound signals, at the reproducing stage, reproduction is possible taking the positions into consideration and an actual audio image can be produced.

Abstract: An audio reproducing apparatus includes a signal source, an audio reproducing unit, an address signal generating unit, a memory and an integrating circuit. The signal source outputs digitized audio signals of a plurality of channels. The audio reproducing unit is fitted into listener's ear portions to reproduce the digital audio signals supplied thereto from the signal source by an electro-acoustic transducer. The address signal generating unit generates an address signal based on a detected signal supplied thereto from a detecting unit for detecting listener's head motion relative to the standard direction. The integrating circuit processes the digital audio signals supplied thereto from the signal source and data concerning impulse response, dependent on head position and memorized in the memory. The audio signals supplied to the audio reproducing unit being corrected in response to listener's head motion in a real time fashion.

Abstract: In the audio signal reproducing apparatus, information on the transfer characteristics representative of the transfer characteristics from virtual sound sources to both ears of a listener in at least a first quadrant of the rotational angular position of the head M of the listener is stored in storing unit 22. The transfer characteristics in rotational angular position of the head M represented by detection outputs from detecting unit 5L, 5R and 13 for detecting the rotational angle position depending upon the movement of the head of the listener are formed based upon the transfer characteristics information of at least the first quadrant stored in the storing unit and left and right channel audio signals are processed by audio signal processing unit 23 for achieving a proper binaural reproduction relative to the virtual sound sources.

Abstract: An acoustic signal reproducing apparatus for supplying an acoustic signal to a headphone device, in which position-detecting reference signals from a reference signal source are sensed by a pair of signal sensors provided at two places over a listener's head. The turning angle and the relative distance of the head with respect to the reference signal source are calculated by processing units on the basis of these signal sensors and transmission characteristics with respect to an arbitrarily positioned imaginary sound source are found from the information concerning the relative distance and the turning angle, with the reference signal source as a reference position. Acoustic signals are processed by acoustic signal processing devices on the basis of the transmission characteristics to realize binaural reproduction with respect to the imaginary sound source.