Acoustic signal reproducing apparatus
First Claim
1. An acoustic signal reproducing apparatus for supplying an acoustic signal to a headphone device on a listener'"'"'s head, comprising:
- a reference signal source for sending out a reference signal for sensing the position of the listener'"'"'s head;
a pair of signal sensor means provided at two positions above the listener'"'"'s head and adapted for receiving the reference signal from said reference signal source and for producing detection output signals;
processing means receiving said detection output signals for calculating a distance and a turning angle of the head relative to a reference position and for finding transmission characteristics for an imaginary sound source which is optionally positioned with said reference signal source at the reference position; and
acoustic signal processing means for processing left-channel acoustic input signals and right-channel acoustic input signals on the basis of an information representing said transmission characteristics as found by said processing means;
wherein the apparatus further comprises level detection means for detecting that the detection output signal of at least one of said pair of signal sensor means has become lower than a reference level, andcontrol means receiving processed acoustic signals from said acoustic signal processing means for controlling an acoustic signal supplied to said headphone device on the basis of a detection output of said level detection means;
wherein an alarm signal is supplied by said control means to said headphone device in response to the level detection output of said level detection means.
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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. A level detection unit detects when the output level of at least one of the signal sensors becomes lower than a reference level and, on the basis of a detection output of the detection unit, the acoustic signals supplied to the headphone device are controlled by a control unit to realize a stable binaural playback operation, and an alarm is supplied to the headphone device in response to the output of the level detection unit.
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Citations
11 Claims
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1. An acoustic signal reproducing apparatus for supplying an acoustic signal to a headphone device on a listener'"'"'s head, comprising:
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a reference signal source for sending out a reference signal for sensing the position of the listener'"'"'s head; a pair of signal sensor means provided at two positions above the listener'"'"'s head and adapted for receiving the reference signal from said reference signal source and for producing detection output signals; processing means receiving said detection output signals for calculating a distance and a turning angle of the head relative to a reference position and for finding transmission characteristics for an imaginary sound source which is optionally positioned with said reference signal source at the reference position; and acoustic signal processing means for processing left-channel acoustic input signals and right-channel acoustic input signals on the basis of an information representing said transmission characteristics as found by said processing means; wherein the apparatus further comprises level detection means for detecting that the detection output signal of at least one of said pair of signal sensor means has become lower than a reference level, and control means receiving processed acoustic signals from said acoustic signal processing means for controlling an acoustic signal supplied to said headphone device on the basis of a detection output of said level detection means; wherein an alarm signal is supplied by said control means to said headphone device in response to the level detection output of said level detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A headphone device for use by a listener, comprising:
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a pair of headphone units supplied with acoustic signals from an acoustic signal source; a main headphone body including said pair of headphone units and a connecting part interconnecting said headphone units; at least two signal sensor means for receiving signals for detecting a head turning angle relative to a reference signal source; supporting means for supporting said signal sensor means so that, when said main headphone body is attached to the listener'"'"'s head, said signal sensor means are disposed on left and right sides of the center of said main headphone body, and so that said signal sensor means are disposed at positions spaced from said main headphone body; said signal sensor means being attached to said main headphone body by said supporting means; and
further comprisinga slider slidably mounted on said connecting part, said supporting means being attached to said slider. - View Dependent Claims (9, 10, 11)
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Specification