Response waveform synthesis method and apparatus
First Claim
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1. A response waveform synthesis method comprising:
- an inverse FFT step, performed by a processor, of using frequency characteristics stored on a frequency characteristic storage, determined for individual ones of a plurality of analyzed bands divided from a predetermined audio frequency range, to set a plurality of synthesized bands in such a manner that each of the synthesized bands is set by using two frequency characteristics respectively of two adjoining analyzed bands of the plurality of analyzed bands, the two frequency characteristics determined respectively through two different frequency resolution values, and in such a manner that a part of each synthesized band overlaps with a part of another adjoining synthesized band on a frequency axis and then determining a time-axial response waveform for each of the synthesized bands, said frequency characteristics being determined, for the individual analyzed bands, with frequency resolution that becomes finer in order of lowering frequencies of the analyzed bands; and
an additive synthesis step, performed by the processor, of adding together the response waveforms of the synthesized bands, to thereby provide a response waveform for a whole of the audio frequency range.
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Abstract
Using frequency characteristics determined for individual ones of a plurality of analyzed bands of a predetermined audio frequency range with frequency resolution that becomes finer in order of lowering frequencies of the analyzed bands, a synthesized band is set for each one or for each plurality of the analyzed bands, and then a time-axial response waveform is determined for each of the synthesized bands. The response waveforms of the synthesized bands are then added together to thereby provide a response waveform for the whole of the audio frequency range.
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Citations
14 Claims
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1. A response waveform synthesis method comprising:
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an inverse FFT step, performed by a processor, of using frequency characteristics stored on a frequency characteristic storage, determined for individual ones of a plurality of analyzed bands divided from a predetermined audio frequency range, to set a plurality of synthesized bands in such a manner that each of the synthesized bands is set by using two frequency characteristics respectively of two adjoining analyzed bands of the plurality of analyzed bands, the two frequency characteristics determined respectively through two different frequency resolution values, and in such a manner that a part of each synthesized band overlaps with a part of another adjoining synthesized band on a frequency axis and then determining a time-axial response waveform for each of the synthesized bands, said frequency characteristics being determined, for the individual analyzed bands, with frequency resolution that becomes finer in order of lowering frequencies of the analyzed bands; and an additive synthesis step, performed by the processor, of adding together the response waveforms of the synthesized bands, to thereby provide a response waveform for a whole of the audio frequency range. - View Dependent Claims (2, 3, 4, 5)
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6. A response waveform synthesis apparatus comprising:
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a frequency characteristic storage storing frequency characteristics determined for individual ones of a plurality of analyzed bands divided from a predetermined audio frequency range, said frequency characteristics being determined with frequency resolution that becomes finer in order of lowering frequencies of the analyzed bands; and a processor performing the operations of; an inverse FFT operation section that sets a plurality of synthesized bands in such a manner that each of the synthesized bands is set by using two frequency characteristics respectively of two adjoining analyzed bands of the plurality of analyzed bands, the two frequency characteristics determined respectively through two different frequency resolution values, and in such a manner that a part of each synthesized band overlaps with a part of another synthesized band adjoining the same on a frequency axis and then determines a time-axial response waveform for each of the synthesized bands; and an additive synthesis section that adds together the response waveforms of the synthesized bands, to thereby provide a response waveform for a whole of the audio frequency range. - View Dependent Claims (7, 8, 9, 10)
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11. A non-transitory computer-readable storage medium containing a group of instructions for causing a computer to perform a response waveform synthesis program, said response waveform synthesis program comprising:
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a first step of selecting selectable speaker candidates on the basis of information of a shape of a room where speakers are to be positioned; a second step of receiving selection operation for selecting one speaker from among the selectable speaker candidates; a third step of, on the basis of a characteristic of the speaker selected via said second step, selecting such an installing orientation of the speaker as to minimize variation in sound level at individual positions of a sound receiving surface of the room; a fourth step of calculating, for each of a plurality of analyzed bands divided from a predetermined audio frequency range, a frequency characteristic at a predetermined position of the room on the basis of the information of the shape of the room and the installing orientation of the speaker determined by said third step; an inverse FFT step of setting a synthesized band for every adjoining two of the analyzed bands in such a manner that a part of each synthesized band overlaps with a part of another synthesized band adjoining the same on a frequency axis and then determining a time-axial response waveform for each of the synthesized bands; and an additive synthesis step of adding together the response waveforms of the synthesized bands, to thereby provide a response waveform for a whole of the audio frequency range. - View Dependent Claims (12, 13, 14)
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Specification