Abstract: A light-signal transfer apparatus capable of continuously reproducing signals even if the transfer passage is temporarily intercepted, the apparatus being structured in such a manner that a delay memory delays time-sequential digital data to generate digital data, a multiplexer multiplexes two digital data items to transfer the data items as infrared rays. An error correction circuit corrects the transmitted signals to output multiplexed data and outputs error detection signal indicating a fact that correction cannot be performed because of interception of the transfer passage or the like. A demultiplexer separates transmitted multiplexed data into two digital data items, and a delay memory delays one of the digital data items to make coincide the time bases of the two data items. A data selector selects either of the two digital data items in accordance with information of the error detection signal.

Abstract: A light-signal transfer apparatus capable of continuously reproducing signals even if the transfer passage is temporarily intercepted, the apparatus being structured in such a manner that a delay memory delays time-sequential digital data to generate digital data, a multiplexer multiplexes two digital data items to transfer the data items as infrared rays. An error correction circuit corrects the transmitted signals to output multiplexed data and outputs error detection signal indicating a fact that correction cannot be performed because of interception of the transfer passage or the like. A demultiplexer separates transmitted multiplexed data into two digital data items, and a delay memory delays one of the digital data items to make coincide the time bases of the two data items. A data selector selects either of the two digital data items in accordance with information of the error detection signal.

Abstract: The movie film has two tracks of left and right digital audio data recording areas in addition to a frame image information recording area in the form of frames, an analog audio data recording area, and left and right perforations. In these audio data recording areas, the same encoded audio data is recorded. Preferably, the audio data is constituted, using the encoding system called the ATRAC system, by the encoding parameter data, the encoded audio data, and the same parameter as the encoding parameter doubly written. This doubly written parameter is recorded in a manner so that when for example the encoding parameter and the encoded audio data are recorded on the left side audio data recording area for a certain channel, the tracks are switched so that the recording is carried out on the opposite right side audio data recording area.

Abstract: With the signal encoding method and apparatus according to the present invention, noise components of plural channels are encoded individually by a first encoding unit 124, while noise components of plural channels are encoded in common by a second encoding unit 125. A discriminating unit 123 discriminates characteristics of noise components of plural channels. Based upon the results of discrimination, selective switching is made between an output of the first encoding unit 124 and an output of the second encoding unit 125. If the noise components of plural channels are encoded in common, the compression ratio for the noise components of plural channels may be improved. On the other hand, if the noise components of plural channels are not encoded in common, ill effects due to common handling can be prohibited.

Abstract: The present invention relates to a transmission device and a transmission method which can efficiently perform transmission of audio signals with infrared ray and suppress the complication of data processing in modulation and demodulation processes to the minimum level. Audio signals reproduced by a digital audio instrument are transmitted to and recorded into a digital audio recorder through an audio signal transmission device by infrared ray. In the digital audio recorder, the recorded audio signals are immediately reproduced, transmitted and output to a digital audio instrument through an audio transmission device with infrared ray. In the transmitters, a transmission channel clock having the frequency of 5/4-times the data clock thereof from the audio signals, and modulated signals obtained by modulating the audio signals are output at the timing of the transmission channel clock.

Abstract: There is provided a coding method which can effectively prevent a pre-echo and a post-echo from being generated and can perform effective coding to which an psycho-acoustic model is applied. A coding apparatus according to the coding method of the present invention detects the attack and release portions of a waveform signal, and performs gain control to a waveform signal before the attack portion and the waveform signal of the release portion by using a gain control amount adaptively calculated according to the characteristics of the waveform signal. An psycho acoustic model window circuit to an aural model application circuit calculate a masking level based on the psycho-acoustic model from a frequency component obtained by transforming the waveform signal, and a quantization precision determination circuit determines a quantization precision by using the masking level. An window circuit and a transform circuit transform the waveform signal into a plurality of frequency components.

Abstract: An apparatus and method for high efficient signal coding by separating frequency components obtained by converting an input signal into tone property component signals and the other component signals by using a mask level obtained based on the psychoacoustic model and coding these signals respectively to increase signal coding quality and efficiency.

Abstract: The input signal of one of the plural channels is converted by a converting circuit into frequency components which are separated into tonal components and noise components in a signal comment separating circuit. The tonal components and the signal components are encoded by a tonal component encoding circuit and a noise component encoding circuit, respectively. The amount of bytes allocated to the noise components in the respective channels is determined by a byte allocation circuit based upon time changes of the sum of the scale factors of the respective channels.

Abstract: An encoding method and apparatus for encoding multi-channel signals employed in, for example, a stereo system of a video disc player, a video tape recorder, a motion picture film picture system, or a so-called multi-surround acoustic system. Five channels, namely the center (C) channel, left (L) channel, right (R) channel, left surround (SL) channel and the right surround (SR) channel, for example, are handled in common depending upon frequency characteristic of digital audio signal and the targeted playback environment, and encoding is done while the combinations of the channels to be handled in common are altered. High compression may be achieved with the use of pre-existing encoding and decoding units by handling the channels in common without dependency upon the degree of correlation of multi-channel digital data.

Abstract: A method and apparatus for encoding input signals, such as digital data, by so-called high-efficiency encoding, in which pre-echo and post-echo are suppressed. A gain control position decision circuit detects an attack portion and a release portion of an audio signal entering an input terminal. An acoustic model application circuit finds a masking level based on a psychoacoustic model of the input signal. A gain control decision circuit determines the gain control value adaptively selected in accordance with the masking level. A gain control circuit controls the gain of the audio signal entering the input terminal in meeting with the gain control value.

Abstract: A low bit rate encoder for compression-encoding digital audio signals of a plurality of channels makes use of both the property of the audio signal and the hearing sense of the human being. The encoder includes: an energy detecting section for detecting energies of the digital audio signals every digital audio signals of the respective channel, a bit allocation amount determining section for determining bit allocation amounts to the respective channels on the basis of the detected result, a compression-encoding section for compression-encoding the digital audio signals on the basis of the bit allocation amounts allocated for every respective channel in accordance with the determined bit allocation amounts, and a multiplexing section for multiplexing the compression-encoded signals every respective channels.

Abstract: A high-efficiency encoding method and apparatus assuring a higher data compression ratio than with known encoding method and apparatus. The multi-channel signals including bandwidth-limited signals of at least one channel are encoded by the same encoding technique by an encoding unit. The bandwidth-limited signals of at least one channel, resulting from encoding by the encoding unit, are re-encoded by a re-encoding unit for eliminating the redundant information produced by the bandwidth limitation.

Abstract: A motion picture film capable of reproducing the sound field full of ambience in the reproducing system. The digital sound tracks 5L and 5R, on which digital audio data have been recorded, are recorded so that temporally same digital audio signals are recorded with a spatial shift by a preset distance along the film running direction.

Abstract: A motion picture film capable of reproducing the sound field full of ambience in the reproducing system. The digital sound tracks 5L and 5R, on which digital audio data have been recorded, are recorded so that temporally same digital audio signals are recorded with a spatial shift by a preset distance along the film running direction.

Abstract: A motion picture film capable of reproducing the sound field full of ambience in the reproducing system. The digital sound tracks 5L and 5R, on which digital audio data have been recorded, are recorded so that temporally same digital audio signals are recorded with a spatial shift by a preset distance along the film running direction.

Abstract: In a motion picture film of the present invention, audio data digitized from right channel analog audio signals is held in a recording region provided in a left channel digital sound track having the left channel audio data recorded in it, while audio data digitized from left channel analog audio signals is held in a recording region provided in a right channel digital sound track having the right channel audio data recorded in it. With a reproducing system for reproducing the motion picture film of the present invention, unless the left and right channels are destroyed simultaneously, the audio data reproduced from the sound track is used in substitution for the audio data from the destroyed channel to compensate for playback sound interruption.

Abstract: An encoding method and apparatus for audio signals for generating ten-channel audio signals from audio signals of a left channel, a left center channel, a center channel, a right center channel, a right channel, a surround left channel, a surround right channel and a sub-woofer channel, totalling at eight channels.

Abstract: In an apparatus for reproducing signals recorded in a plurality of slant tracks on a recording medium by a rotary head, the signals in the tracks contain a digital information signal in a first predetermined area on the slant tracks and a tracking control signal including a tracking pilot signal and an erase signal in a second predetermined area. When the recorded tracks are reproduced by a rotary playback head having a tracing width greater than the track width, the pilot signals from the adjacent tracks will be detected and compared in level. A tracking signal for controlling the tracking alignment of the rotary playback head is generated in response to the level comparison. The level of the tracking signal is adjusted in response to the level of the tracking control signal.