Abstract:
A head-related transfer function (HRTF) measurement method includes the following steps: An acousto-electric conversion unit such as a microphone is placed at the expected location of a listeners ears, Firstly, sound waves emitted at a perceived sound source position are picked up by the acousto-electric conversion unit when a dummy head or a human is placed at the listener position. A HRTF is determined from only the sound waves directly reaching the acousto-electric conversion unit. Secondly, sound waves emitted at a perceived sound source position are picked up by the acousto-electric conversion unit when there is no dummy head or a human placed at the listener position. A natural-state transfer property is then determined from only the sound waves directly reaching the acousto-electric conversion unit. Finally, the HRTF is normalized with the natural-state transfer property to obtain a normalized HRTF; which is stored in a storage unit and may be mixed with an audio signal by convolution.
Abstract:
A recording medium which realizes high sound quality and is playable on a conventional playback device has a recording layer provided with a double-layered structure having at least a first layer L1 and a second layer L2, an audio data program is recorded on the first layer in the first data format, which is the conventional format, and the audio data program is recorded on the second layer in a second, new data format. The audio data programs recorded on the first layer and on the second layer are the same program and can be produced using 1-bit DELTA SIGMA modulation having a high sampling rate as the new format, the DELTA SIGMA modulated signal being passed through successive decimation filters to form the lower sampling rate signal of the conventional format. The double-layered disk can be played back using a disk judging unit that detects the disk's table of contents and controls a laser beam focus of a pick up, an operating clock frequency, and the decoder for reading out the data recorded in pits formed on the disk.
Abstract:
A recording medium which is replaceable with a conventional CD player and from which a host reproducing device can reproduce high-quality sounds. The recording medium is provided with a first recording area (3) in which digital audio signals which are sampled at a prescribed sampling frequency and quantized with a prescribed number of bits are recorded, a first management area (2) in which the information required to manage the digital audio signals recorded in the area (3) is recorded, a second recording area (6) in which the digital audio signals corresponding to the digital audio signals recorded in the first recording area (3) are recorded, and a second management area (5) in which the information required to manage the digital audio signals recorded in the area (6) is recorded. Identification data representing the presence of the plurality of recording areas are recorded in the first management area (2).
Abstract:
An audio signal recording device having an input terminal 51, a modulator 50 for modulating an input signal, a detecting circuit 52 for detecting whether an input signal maintains a fixed value for a predetermined period of time, a signal generator 53 for generating an idling signal, a delay 54 for delaying a modulated input signal and a switch 56 for alternately inputting either the idling signal or modulated input signal to a recording circuit. The idling signal may be derived by applying the delayed signal to a flip-flop circuit. Various recording/reproducing arrangements including sigma/delta modulators but not the switching feature are also described in the specification.
Abstract:
A connector (2) in Fig. 5 provided on a projector has an RF chip (6). A plug (1A) connected to the connector (2) has an RF chip (5A) at a position opposite to the RF chip (6) of the connector (2). When a protruding section (7) of the plug (1A) is inserted and fit into an aperture section (8) of the connector (2), the RF chip (5A) of the plug (1A) and the RF chip (6) of the connector (2) perform wireless communication with each other in a non-contact state. Thus, a connecting tool can be easily attached to/detached from a receiving tool without breaking a terminal due to contact such as in a case where a conventional contact type terminal is used.
Abstract:
A recording medium which realizes high sound quality and is playable on a conventional playback device has a recording layer provided with a double-layered structure having at least a first layer L1 and a second layer L2, an audio data program is recorded on the first layer in the first data format, which is the conventional format, and the audio data program is recorded on the second layer in a second, new data format. The audio data programs recorded on the first layer and on the second layer are the same program and can be produced using 1-bit DELTA SIGMA modulation having a high sampling rate as the new format, the DELTA SIGMA modulated signal being passed through successive decimation filters to form the lower sampling rate signal of the conventional format. The double-layered disk can be played back using a disk judging unit that detects the disk's table of contents and controls a laser beam focus of a pick up, an operating clock frequency, and the decoder for reading out the data recorded in pits formed on the disk.
Abstract:
A recording medium which is replaceable with a conventional CD player and from which a host reproducing device can reproduce high-quality sounds. The recording medium is provided with a first recording area (3) in which digital audio signals which are sampled at a prescribed sampling frequency and quantized with a prescribed number of bits are recorded, a first management area (2) in which the information required to manage the digital audio signals recorded in the area (3) is recorded, a second recording area (6) in which the digital audio signals corresponding to the digital audio signals recorded in the first recording area (3) are recorded, and a second management area (5) in which the information required to manage the digital audio signals recorded in the area (6) is recorded. Identification data representing the presence of the plurality of recording areas are recorded in the first management area (2).
Abstract:
A recording medium which is replaceable with a conventional CD player and from which a host reproducing device can reproduce high-quality sounds. The recording medium is provided with a first recording area (3) in which digital audio signals which are sampled at a prescribed sampling frequency and quantized with a prescribed number of bits are recorded, a first management area (2) in which the information required to manage the digital audio signals recorded in the area (3) is recorded, a second recording area (6) in which the digital audio signals corresponding to the digital audio signals recorded in the first recording area (3) are recorded, and a second management area (5) in which the information required to manage the digital audio signals recorded in the area (6) is recorded. Identification data representing the presence of the plurality of recording areas are recorded in the first management area (2).
Abstract:
A recording medium which realizes high sound quality and is playable on a conventional playback device has a recording layer provided with a double-layered structure having at least a first layer L1 and a second layer L2, an audio data program is recorded on the first layer in the first data format, which is the conventional format, and the audio data program is recorded on the second layer in a second, new data format. The audio data programs recorded on the first layer and on the second layer are the same program and can be produced using 1-bit DELTA SIGMA modulation having a high sampling rate as the new format, the DELTA SIGMA modulated signal being passed through successive decimation filters to form the lower sampling rate signal of the conventional format. The double-layered disk can be played back using a disk judging unit that detects the disk's table of contents and controls a laser beam focus of a pick up, an operating clock frequency, and the decoder for reading out the data recorded in pits formed on the disk.