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US 7,933,418 B2Granted
Sound reproducing apparatus and method of identifying positions of speakers
AssigneeYamaha Corporation
InventorMorito Morishima
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AssigneeYamaha Corporation
InventorMorito Morishima
Estimating the term…
A position of a speaker is detected two-dimensionally or three-dimensionally, and a sound field is corrected. A sound reproducing apparatus includes a measuring signal generating portion for generating a first measuring signal, a transmission portion for transmitting a second measuring signal as soon as the first measuring signal is generated, sensors disposed in a listening position and for measuring a time difference between a time instant when the second measuring signal was received and a time instant when a measuring sound wave radiated from a to-be-detected speaker in accordance with the first measuring signal was received, and a position calculating portion for calculating a distance, as to each of n sensors, between each of the n sensors and the to-be-detected speaker based on the measured time difference, and calculating the position of the to-be-detected speaker based on distances among the n sensors and the calculated distance.
A sound reproducing apparatus for driving a plurality of speakers with two of the speakers having a known distance therebetween to reproduce multi-channel sound, the sound reproducing apparatus comprising:
A method of identifying a position of each of a plurality of speakers using at least two sensors disposed in a listening position, the method comprising the steps of:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
This is a U.S. National Phase Application of PCT International Application PCT/JP2005/002833 filed on Feb. 16, 2005.
The present invention relates to a sound reproducing apparatus for reproducing multi-channel sound, and particularly, relates to a sound reproducing apparatus and a method of identifying positions of speakers in which positions of speakers are detected two-dimensionally or three dimensionally so that a sound field can be corrected effectively.
Recently, multi-channel audio signals such as 5.1-channel audio signals are recorded in some audio sources such as DVDs. Multi-channel sound reproducing systems for reproducing such audio sources have been coming into wide use even in general homes. In such a multi-channel sound reproducing system, a multi-channel sound reproducing effect expected by an audio equipment maker can be obtained when respective speakers are disposed in a listening room according to a layout method recommended by the maker. It is therefore likely that sound image localization will be out of place if the layout of the speakers is greatly different from the recommended layout.
FIG. 1 is a block diagram showing the configuration of a sound reproducing apparatus according to a first embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of each sensor in the sound reproducing apparatus according to the first embodiment of the present invention.
FIG. 3 is a flow chart showing a sound field correction process in the sound reproducing apparatus according to the first embodiment of the present invention.
Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a sound reproducing apparatus according to a first embodiment of the present invention.
The sound reproducing apparatus in FIG. 1 includes sensors 1 (1-1 and 1-2) for detecting positions of speakers SP-C, SP-L, SP-R, SP-RL, SP-RR, SP-RC and SP-SW, and a multi-channel amplifier 2.
The multi-channel amplifier 2 includes a decoder 20, a multiplexer 21, a sound field processing portion 22, a changeover switch 23, a power amplifier 24, a measuring signal generating portion 25, a reference signal transmitting portion 26, a reception portion 27, a position calculating portion 28, a position table 29, a speaker layout correction portion 30 and a sound field control portion 31.
Control circuits for electronic adaptation of the sound field: electronic adaptation dependent on speaker or headphone connection
Stereophonic arrangements: spatial or constructional arrangements of loudspeakers
Control circuits for electronic adaptation of the sound field: automatic calibration of stereophonic sound system, e.g. with test microphone
Details of stereophonic arrangements covered by H04R5/00 but not provided for in any of its subgroups: positioning of loudspeaker enclosures for…
Term ended 6 Jul 2026 (estimated)