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US 7,010,491 B1Granted
Method and system for waveform compression and expansion with time axis
AssigneeRoland Corporation
InventorTadao Kikumoto
Life of this patent
Estimating the term…
Abstract
With the goal of presenting a waveform compression and expansion apparatus with which the sound quality of such things as musical tones that are expressed by waveforms is satisfactory following the compression and expansion of the waveforms of the musical tones etc., a method and system for waveform compression and expansion is disclosed in which all of the multiple number of band divided waveforms that comprise the original waveform which has been band divided are apportioned to at least two kinds of compression and expansion formats and form a multiple number of compressed and expanded waveforms by compression or expansion an identical amount only in the direction of the temporal axis.
Claims29
A method for generating a compressed or expanded waveform from original waveform data, said generated compressed or expanded waveform capable of being stored or reproduced, the method comprising the steps of:
- frequency band-dividing the original waveform data to produce a plurality of frequency band-divided waveforms;
- receiving position data including a plurality of time points indicating when waveform data is to be read out from the plurality of frequency band-divided waveforms, and position information elements indicating a particular location in the plurality of frequency band-divided waveforms corresponding to each time point;
- generating at least one processed waveform from each frequency band-divided waveform according to the position data and at least one compression and expansion format;
- and
- superimposing a plurality of processed waveforms generated from all frequency band-divided waveforms to form the compressed or expanded waveform;
- wherein in accordance with a first compression and expansion format, the step of generating at least one processed waveform from each frequency band-divided waveform further includes the steps of:
- receiving a plurality of opening and starting addresses, each opening and starting address designating a starting point of cycles that comprise the frequency band-divided waveform;
- receiving a plurality of position information elements, each position information element designating a particular cycle and address of the frequency band-divided waveform corresponding to each time point;
- reading out first waveform data from the frequency band-divided waveform of at least two repeated cycles starting at the opening and starting address associated with the cycle corresponding to every other time point, and waveshaping the first waveform data with an envelope to form a first processed waveform;
- and
- reading out second waveform data from the frequency band-divided waveform of at least two repeated cycles starting at the opening and starting address associated with the cycle corresponding to every other time point that does not coincide with the reading out of the first waveform data, and waveshaping the second waveform data with the envelope to form a second processed waveform.
8 more elements
A method for generating a compressed or expanded waveform from original waveform data, said generated compressed or expanded waveform of being stored or reproduced, the method comprising the steps of:
- frequency band-dividing the original waveform data to produce a plurality of frequency band-divided waveforms;
- receiving position data including a plurality of time points indicating when waveform data is to be read out from the plurality of frequency band-divided waveforms, and position information elements indicating a particular location in the plurality of frequency band-divided waveforms corresponding to each time point;
- generating at least one processed waveform from each frequency band-divided waveform according to the position data and at least one compression and expansion format;
- and
- superimposing a plurality of processed waveforms generated from all frequency band-divided waveforms to form the compressed or expanded waveform;
- wherein the step of generating at least one processed waveform from each frequency band-divided waveform further includes the steps of:
- receiving a plurality of position information elements, each position information element designating a different address of the frequency band-divided waveform corresponding to each time point;
- receiving pitch data indicating a read-out speed of the waveform portions;
- reading out successive first waveform portions from the frequency band-divided waveform at the read-out speed at every other time point, each first waveform portion comprising waveform data starting at the address of the position information element corresponding to the time point, the successive first waveform portions comprising first read-out waveform data;
- reading out successive second waveform portions from the frequency band-divided waveform at the read-out speed at every other time point that does not coincide with the reading out of successive first waveform portions, each second waveform portion comprising waveform data starting at the address of the position information element corresponding to the time point, the successive second waveform portions comprising second read-out waveform data;
- waveshaping the first read-out waveform data with an envelope to form a first processed waveform;
- and
- waveshaping the second read-out waveform data with the envelope to form a second processed waveform.
10 more elements
A method for generating a compressed or expanded waveform from original waveform data, said generated compressed or expanded waveform capable of being stored or reproduced, the method comprising the steps of:
- frequency band-dividing the original waveform data to produce a plurality of frequency band-divided waveforms;
- receiving position data including a plurality of time points indicating when waveform data is to be read out from the plurality of frequency band-divided waveforms, and position information elements indicating a particular location in the plurality of frequency band-divided waveforms corresponding to each time point;
- generating at least one processed waveform from each frequency band-divided waveform according to the position data and at least one compression and expansion format;
- and
- superimposing a plurality of processed waveforms generated from all frequency band-divided waveforms to form the compressed or expanded waveform;
- wherein the step of generating at least one processed waveform from each frequency band-divided waveform further includes the steps of:
- receiving a plurality of mark addresses that designate a starting point at delimiting locations of waveform segments of the frequency band-divided waveform;
- receiving a plurality of position information elements indicating a particular waveform segment of the frequency band-divided waveform corresponding to each time point;
- receiving pitch data indicating a read-out speed of the waveform portions;
- reading out portions of at least one waveform segment at the read-out speed at every time point of the frequency band-divided waveform, the portions of at least one waveform segment comprising waveform data starting at the mark address associated with the waveform segment corresponding to the time point and ending with a mark address corresponding to a subsequent time point;
- and
- sequencing consecutive portions of at least one waveform segment to generate a processed waveform from the frequency band-divided waveform.
9 more elements
A method for generating a compressed or expanded waveform from original waveform data, said generated compressed or expanded waveform capable of being stored or reproduced, the method comprising the steps of:
- frequency band-dividing the original waveform data to produce a plurality of frequency band-divided waveforms;
- receiving position data including a plurality of time points indicating when waveform data is to be read out from the plurality of frequency band-divided waveforms, and position information elements indicating a particular location in the plurality of frequency band-divided waveforms corresponding to each time point;
- generating at least one processed waveform from each frequency band-divided waveform according to the position data and at least one compression and expansion format;
- superimposing a plurality of processed waveforms generated from all frequency band-divided waveforms to form the compressed or expanded waveform;
- and
- compressing or expanding each processed waveform by an identical amount of time;
- wherein the step of frequency band-dividing the original waveform data further including the steps of:
- sampling the original waveform data at a sampling frequency FS;
- and
- dividing the original waveform data into N frequency band-divided waveforms, wherein the Mth frequency band-divided waveform, where M is an integer varying from one to N, is sampled at a sampling frequency equal to FS divided by 2(M−1), and has a frequency band ranging from Fs divided by 2(M+1) to FS divided by 2(M).
7 more elements
A method for generating a compressed or expanded waveform from original waveform data, said generated compressed or expanded waveform capable of being stored or reproduced, the method comprising the steps of:
- frequency band-dividing the original waveform data to produce a plurality of frequency band-divided waveforms;
- receiving position data including a plurality of time points indicating when waveform data is to be read out from the plurality of frequency band-divided waveforms, and position information elements indicating a particular location in the plurality of frequency band-divided waveforms corresponding to each time point;
- generating at least one processed waveform from each frequency band-divided waveform according to the position data and at least one compression and expansion format;
- and
- superimposing a plurality of processed waveforms generated from all frequency band-divided waveforms to form the compressed or expanded waveform;
- wherein the step of frequency band-dividing the original waveform data further includes the steps of dividing the original waveform data into a plurality of frequency band-divided waveforms, each frequency band-divided waveform having a plurality of frequency band waveform components;
- receiving a plurality of mark addresses that designate a starting point at delimiting locations of waveform segments of the frequency band-divided waveform;
- receiving a plurality of position information elements indicating a particular waveform segment of the frequency band-divided waveform corresponding to each time point;
- receiving pitch data indicating a read-out speed of the waveform portions;
- reading out portions of at least one waveform segment at the read-out speed at every time point of the frequency band-divided waveform, the portions of at least one waveform segment comprising waveform data starting at the mark address associated with the waveform segment corresponding to the time point and ending with a mark address corresponding to a subsequent time point;
- and
- sequencing consecutive portions of at least one waveform segment to generate a processed waveform from the frequency band-divided waveform;
- and
- wherein the step of superimposing a plurality of processed waveforms comprising the steps of:
- multiplying each processed waveform with a level-controllable time window;
- filtering at least one of the plurality of processed waveforms generated from the plurality of frequency band-divided waveforms according to a frequency band of the frequency band-divided waveform associated with each processed waveform;
- and
- summing the processed waveforms to form the compressed or expanded waveforms.
15 more elements
A method for generating a compressed or expanded waveform from original waveform data, said generated compressed or expanded waveform capable of being stored or reproduced, the method comprising the steps of:
- frequency band-dividing the original waveform data to produce a plurality of frequency band-divided waveforms;
- receiving position data including a plurality of time points indicating when waveform data is to be read out from the plurality of frequency band-divided waveforms, and position information elements indicating a particular location in the plurality of frequency band-divided waveforms corresponding to each time point;
- generating at least one processed waveform from each frequency band-divided waveform according to the position data and at least one compression and expansion format;
- and
- superimposing a plurality of processed waveforms generated from all frequency band-divided waveforms to form the compressed or expanded waveform;
- wherein the step of frequency band-dividing the original waveform data further includes the steps of dividing the original waveform data into a plurality of frequency band-divided waveforms, each frequency band-divided waveform having a plurality of frequency band waveform components, the step of frequency band-dividing the original waveform data further including the steps of:
- dividing the original waveform data into three frequency band-divided waveforms;
- generating at least one processed waveform from the first and second frequency band-divided waveforms in accordance with a compression and expansion format comprising the steps of
- receiving a plurality of mark addresses that designate a starting point at zero-crossings of waveform segments of the frequency band-divided waveform,
- receiving a plurality of position information elements indicating a particular waveform segment of the frequency band-divided waveform corresponding to each time point,
- receiving pitch data indicating a read-out speed of the waveform portions, reading out portions of at least one waveform segment at the read-out speed at every time point of the frequency band-divided waveform, the portions of at least one waveform segment comprising waveform data starting at the mark address associated with the waveform segment corresponding to the time point, and
- sequencing consecutive portions of at least one waveform segment to generate a processed waveform from the frequency band-divided waveform;
- and
- generating at least one processed waveform from the third frequency band-divided waveform in accordance with a compression and expansion format comprising the steps of
- receiving a plurality of opening and starting addresses, each opening and starting address designating a starting point of cycles that comprise the frequency band-divided waveform,
- receiving a plurality of position information elements, each position information element designating a particular cycle and address of the frequency band-divided waveform corresponding to each time point,
- reading out first waveform data from the frequency band-divided waveform of at least two repeated cycles starting at the opening and starting address associated with the cycle corresponding to every other time point, and waveshaping the first waveform data with an envelope to form a first processed waveform, and
- reading out second waveform data from the frequency band-divided waveform of at least two repeated cycles starting at the opening and starting address associated with the cycle corresponding to every other time point that does not coincide with the reading out of the first waveform data, and waveshaping the second waveform data with the envelope to form a second processed waveform,
- wherein the step of superimposing a plurality of processed waveforms comprising the steps of:
- multiplying each processed waveform with a level-controllable time window;
- filtering at least one of the plurality of processed waveforms generated from the plurality of frequency band-divided waveforms according to a frequency band of the frequency band-divided waveform associated with each processed waveform;
- and
- summing the processed waveforms to form the compressed or expanded waveforms.
20 more elements
A waveform compression apparatus for compressing a plurality of frequency band-divided waveforms generated from an original waveform, each of the plurality of frequency band-divided waveforms comprising waveform components of a corresponding frequency band of a plurality of frequency bands, the apparatus comprising:
- compression means with which each of the plurality of frequency band-divided waveforms is apportioned to a corresponding one of at least two different kinds of compression formats during compression, and each of the plurality of frequency band-divided waveforms is compressed in accordance with the corresponding compression format in a direction of a temporal axis to provide a corresponding compressed frequency band-divided waveform;
- and
- a superimposing means in which, by superimposing the plurality of compressed frequency band-divided waveforms, a resultant waveform that corresponds to the original waveform that has been compressed in the direction of the temporal axis is formed;
- wherein said resultant waveform is capable of being stored or reproduced.
1 more element
A waveform compression apparatus for compressing a plurality of temporally divided waveforms, comprising:
- a processing format specification means in which a corresponding compression processing format of a plurality of compression processing formats is specified for each of the plurality of temporally divided waveforms during compression, said plurality of compression processing formats including at least two different compression processing formats, each of the at least two different compression processing formats for compressing waveforms;
- and
- a compression means in which compression processing is performed on each temporally divided waveform of the plurality of temporally divided waveforms to compress the temporally divided waveform in a direction of a temporal axis according to the specified corresponding compression processing format to provide a corresponding resultant temporally divided waveform that is capable of being stored or reproduced.
A waveform expansion apparatus for expanding a plurality of frequency band-divided waveforms generated from an original waveform, each of the plurality of frequency band-divided waveforms comprising waveform components of a corresponding frequency band of a plurality of frequency bands, the apparatus comprising:
- expansion means with which each of the plurality of frequency band-divided waveforms is apportioned to a corresponding one of at least two different kinds of expansion formats during expansion, and each of the plurality of frequency band-divided waveforms is expanded in accordance with the corresponding expansion format in a direction of a temporal axis to provide a corresponding expanded frequency band-divided waveform;
- and
- a superimposing means in which, by superimposing the plurality of expanded frequency band-divided waveforms, a resultant waveform that corresponds to the original waveform that has been expanded in the direction of the temporal axis is formed;
- wherein said resultant waveform is capable of being stored or reproduced.
1 more element
A waveform expansion apparatus for expanding a plurality of temporally divided waveforms, comprising:
- a processing format specification means in which a corresponding expansion processing format of a plurality of expansion processing formats is specified for each of the plurality of temporally divided waveforms during expansion, said plurality of expansion processing formats including at least two different expansion processing formats, each of the at least two different expansion processing formats for expanding waveforms;
- and
- an expansion means in which expansion processing is performed on each temporally divided waveform of the plurality of temporally divided waveforms to expand the temporally divided waveform in a direction of a temporal axis according to the specified corresponding expansion processing format to provide a corresponding resultant temporally divided waveform that is capable of being stored or reproduced.
Dependencies are inferred from the claim text.