EP0241922A2
Expired / Lapsed
EP
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Musical tone generating apparatus
Assignee: Yamaha Corp
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Filing: 1987-04-14
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Granted: —
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Expires: 2007-04-14
Abstract
Abstract A musical tone generating apparatus utilizing a data compression method is disclosed. A musical tone is sampled and is converted into waveform data (S(n)). These waveform data (S(n)) are compressed into compressed dta (C(n)) by a linear predictive coding method and further by a differential quantization method. The number of bits of each of the compressed data (C(n)) is thus significantly smaller than that of the waveform data (S(n)). Thereafter, a memory (2) stores the thus compressed data corresponding to an attack portion of the tone and a selected part of a sustain portion of the tone. Hence, it is possible to remarkably reduce the memory storage. When generating a musical tone, the memory (2) reads out the compressed data (C(n)) of the attack portion and thereafter repeatedly reads out the compressed data of the selected part. The read-out compressed data are sequentially decoded into the original digital data. Thus, the whole waveform of the musical tone is reproduced.
Inventors
- 👤 Hideo C/O Nippon Gakki Suzuki
- 👤 Masaki C/O Nippon Gakki Kudo
- 👤 Yasushi C/O Nippon Gakki Kurakake
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 09:51
CPC Classifications
H; H03; H03M; H03M3/00; H03M3/04; H03M3/042; G; G10; G10H; G10H1/00; G10H1/0033; G10H1/0041; G10H1/18; G10H1/26; G10H7/00; G10H7/08; G10H7/12; G10H2250/00; G10H2250/541; G10H2250/571; G10H2250/591; G10H2250/595; G10H2250/601
Claims Analysis
Total Claims: 56
Claim 1
Independent Claim
127 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (a) memory means for storing a series of compressed waveform data therein, said series of compressed waveform data being obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by use of a predictive coding method and a differential quantization method; (b) reading means for reading said series of compressed waveform data from said memory means; and (c) decoding means for decoding said read series of compressed waveform data by methods corresponding to said predictive coding method and said differential quantization method to obtain a series of decoded waveform data, said musical tone being reproduced based on said series of decoded waveform data.
Claim 2
Dependent Claim
127 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (a) memory means for storing a series of compressed waveform data therein, said series of compressed waveform data being obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by use of a predictive coding method and a differential quantization method; (b) reading means for reading said series of compressed waveform data from said memory means; and (c) decoding means for decoding said read series of compressed waveform data by methods corresponding to said predictive coding method and said differential quantization method to obtain a series of decoded waveform data, said musical tone being reproduced based on said series of decoded waveform data.
Claim 3
Dependent Claim
78 words
A musical tone generating apparatus according to claim 1, wherein said decoding means comprises first stage decoding means for decoding said series of compressed waveform data read from said memory means by the method corresponding to said differential quantization method to obtain a series of intermediate decoded data and second stage decoding means for decoding said series of intermediate decoded data by the method corresponding to said predictive coding method to produce said series of decoded waveform data.
Claim 4
Dependent Claim
22 words
A musical tone generating apparatus according to claim 1 or claim 2, wherein said predictive coding method employs a secondary predictive coding.
Claim 5
Dependent Claim
122 words
A musical tone generating apparatus according to claim 1, wherein said musical tone waveform is divided into an attack portion in which an envelope amplitude thereof becomes increasing and a sustain portion in which an envelope amplitude thereof is generally constant, said memory means storing those compressed waveform data corresponding to said attack portion and those compressed waveform data corresponding to a selected part of said sustain portion, said reading means first reading said those compressed waveform data corresponding to said attack portion and then repeatedly reading said those compressed waveform data corresponding to said selected part of said sustain portion so that the whole waveform of said musical tone is reproduced from said compressed waveform data stored in said memory means.
Claim 6
Dependent Claim
61 words
A musical tone generating apparatus according to claim 1 further comprising sampling means for sampling said musical tone waveform to produce said instantaneous values, encoding means for encoding said instantaneous values by said predictive coding method to produce encoded values, and quantizing means for quantizing said encoded values by said differential quantization method to produce said series of compressed waveform data.
Claim 7
Dependent Claim
61 words
A musical tone generating apparatus according to claim 1 further comprising a keyboard, said memory means storing said series of compressed waveform data with respect to each key of said keyboard, said reading means being responsive to each depressed key of said keyboard to read the series of compressed waveform data corresponding to said each depressed key from said memory means.
Claim 8
Dependent Claim
120 words
A musical tone generating apparatus according to claim 6 further comprising key-depression intensity level detecting means responsive to each depression of key of said keyboard for detecting a level of intensity of said each depression of key to output data representative of the detected intensity level, said series of compressed waveform data corresponding to each key comprising a plurality of groups of compressed waveform data corresponding respectively to predetermined different key-depression intensity levels, said reading means being responsive to said intensity level data to select the series of compressed waveform data corresponding to the depressed key and to read that group of compressed waveform data of said selected series of compressed waveform data which corresponds to the detected intensity level.
Claim 9
Dependent Claim
95 words
A musical tone generating apparatus according to claim 1 further comprising tone color selection means for selecting a desired one of a plurality of tone colors to be given to said musical tone to output data representative of the selected tone color, said memory means storing said series of compressed waveform data with respect to each of said plurality of tone colors, said reading means being responsive to said data representative of the selected tone color to read the series of compressed waveform data corresponding to said selected tone color data from said memory means.
Claim 10
Dependent Claim
216 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (a) first memory means for storing a group of compressed waveform data divided into a plurality of frames which correspond respectively to a plurality of frames of a waveform of a musical tone represented by said group of compressed waveform data, said group of compressed waveform data being obtained by calculating a predictive coefficient with respect to each frame of said compressed waveform data group and effecting a predictive coding operation on instantaneous values of each frame of said compressed waveform data group using a corresponding one of the calculated predictive coefficients; (b) second memory means for storing said calculated predictive coefficients; (c) first reading means for reading said group of compressed waveform data from said first memory means; (d) second reading means for reading said calculated predictive coefficients in synchronization with said frames of said compressed waveform data group; and (e) decoding means for decoding the read compressed waveform data group, by effecting a decoding operation corresponding to said predictive coding operation on each frame of said read compressed waveform data group using a respective one of the read predictive coefficients, to thereby obtain a group of decoded waveform data, said musical tone being reproduced from said decoded waveform data.
Claim 11
Dependent Claim
216 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (a) first memory means for storing a group of compressed waveform data divided into a plurality of frames which correspond respectively to a plurality of frames of a waveform of a musical tone represented by said group of compressed waveform data, said group of compressed waveform data being obtained by calculating a predictive coefficient with respect to each frame of said compressed waveform data group and effecting a predictive coding operation on instantaneous values of each frame of said compressed waveform data group using a corresponding one of the calculated predictive coefficients; (b) second memory means for storing said calculated predictive coefficients; (c) first reading means for reading said group of compressed waveform data from said first memory means; (d) second reading means for reading said calculated predictive coefficients in synchronization with said frames of said compressed waveform data group; and (e) decoding means for decoding the read compressed waveform data group, by effecting a decoding operation corresponding to said predictive coding operation on each frame of said read compressed waveform data group using a respective one of the read predictive coefficients, to thereby obtain a group of decoded waveform data, said musical tone being reproduced from said decoded waveform data.
Claim 12
Dependent Claim
20 words
A musical tone generating apparatus according to claim 9, wherein said predictive coding operation is a linear predictive coding operation.
Claim 13
Dependent Claim
125 words
A musical tone generating apparatus according to claim 9, wherein said musical tone waveform is divided into an attack portion in which an envelope amplitude thereof becomes increasing and a sustain portion in which an envelope amplitude thereof is generally constant, said first memory means storing those compressed waveform data corresponding to said attack portion and those compressed waveform data corresponding to a selected part of said sustain portion, said first reading means first reading said those compressed waveform data corresponding to said attack portion and then repeatedly reading said those compressed waveform data corresponding to said selected part of said sustain portion so that the whole waveform of said musical tone is reproduced from said compressed waveform data stored in said first memory means.
Claim 14
Dependent Claim
45 words
A musical tone generating apparatus according to claim 9 further comprising sampling means for sampling said musical tone waveform to produce said instantaneous values, encoding means for encoding said instantaneous values by said linear predictive coding method to produce said group of compressed waveform data.
Claim 15
Dependent Claim
64 words
A musical tone generating apparatus according to claim 9 further comprising a keyboard, said first memory means storing said group of compressed waveform data with respect to each key of said keyboard, said first reading means being responsive to each depressed key of said keyboard to read the group of compressed waveform data corresponding to said each depressed key from said first memory means.
Claim 16
Dependent Claim
121 words
A musical tone generating apparatus according to claim 13 further comprising key-depression intensity level detecting means responsive to each depression of key of said keyboard for detecting a level of intensity of said each depression of key to output data representative of the detected intensity level, said group of compressed waveform data corresponding to each key comprising a plurality of blocks of compressed waveform data corresponding respectively to predetermined different key-depression intensity levels, said first reading means being responsive to said intensity level data to select the group of compressed waveform data corresponding to the depressed key and to read that block of compressed waveform data of said selected group of compressed waveform data which corresponds to the detected intensity level.
Claim 17
Dependent Claim
99 words
A musical tone generating apparatus according to claim 9 further comprising a tone color selection means for selecting a desired one of a plurality of tone colors to be given to said musical tone to output data representative of the selected tone color, said first memory means storing said group of compressed waveform data with respect to each of said plurality of tone colors, said first reading means being responsive to said data representative of the selected tone color to read the group of compressed waveform data corresponding to said selected tone color data from said first memory means.
Claim 18
Dependent Claim
203 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (a) memory means for storing a series of compressed waveform data therein, said series of compressed waveform data being obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by use of either one of a predictive coding method and a modulation method; (b) data providing means for providing replacement data; (c) reading means for repeatedly reading at least one portion of said series of compressed waveform data from said memory means, said replacement data corresponding to data preceding said at least one portion in time among said series of compressed waveform data; (d) circuit means responsive to said replacement data and said at least one portion of said compressed waveform data for replacing the first compressed waveform data of said at least one portion with said replacement data to output a group of compressed waveform data; and (e) decoding means for decoding said group of compressed waveform data by a decoding method corresponding to said one method to obtain a series of decoded waveform data, said musical tone being reproduced based on said series of decoded waveform data.
Claim 19
Dependent Claim
203 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (a) memory means for storing a series of compressed waveform data therein, said series of compressed waveform data being obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by use of either one of a predictive coding method and a modulation method; (b) data providing means for providing replacement data; (c) reading means for repeatedly reading at least one portion of said series of compressed waveform data from said memory means, said replacement data corresponding to data preceding said at least one portion in time among said series of compressed waveform data; (d) circuit means responsive to said replacement data and said at least one portion of said compressed waveform data for replacing the first compressed waveform data of said at least one portion with said replacement data to output a group of compressed waveform data; and (e) decoding means for decoding said group of compressed waveform data by a decoding method corresponding to said one method to obtain a series of decoded waveform data, said musical tone being reproduced based on said series of decoded waveform data.
Claim 20
Dependent Claim
35 words
A musical tone generating apparatus according to claim 16, wherein said modulation method is one of the delta modulation method, the adaptive delta modulation method, the differential modulation method and the adaptive differential modulation method.
Claim 21
Dependent Claim
114 words
A musical tone generating apparatus according to claim 16, wherein said musical tone waveform is divided into an attack portion in which an envelope amplitude thereof becomes increasing and a sustain portion in which an envelope amplitude thereof is generally constant, said memory means storing, as said series of compressed waveform data, those compressed waveform data corresponding to said attack portion and those compressed waveform data corresponding to a selected part of said sustain portion, said reading means first reading said those compressed waveform data corresponding to said attack portion and then repeatedly reading, as said at least one portion, said those compressed waveform data corresponding to said selected part of said sustain portion.
Claim 22
Dependent Claim
39 words
A musical tone generating apparatus according to claim 18, wherein said data providing means comprises second memory means for storing, as said data, the last compressed waveform data of said those compressed waveform data corresponding to said attack portion.
Claim 23
Dependent Claim
44 words
A musical tone generating apparatus according to claim 16 further comprising sampling means for sampling said musical tone waveform to produce said instantaneous values, and encoding means for encoding said instantaneous values by said one method to produce said series of compressed waveform data.
Claim 24
Dependent Claim
61 words
A musical tone generating apparatus according to claim 16 further comprising a keyboard, said memory means storing said series of compressed waveform data with respect to each key of said keyboard, said reading means being responsive to each depressed key of said keyboard to read the series of compressed waveform data corresponding to said each depressed key from said memory means.
Claim 25
Dependent Claim
120 words
A musical tone generating apparatus according to claim 21 further comprising key-depression intensity level detecting means responsive to each depression of key of said keyboard for detecting a level of intensity of said each depression of key to output data representative of the detected intensity level, said series of compressed waveform data corresponding to each key comprising a plurality of blocks of compressed waveform data corresponding respectively to predetermined different key-depression intensity levels, said reading means being responsive to said intensity level data to select the series of compressed waveform data corresponding to the depressed key and to read that block ot compressed waveform data of said selected series of compressed waveform data which corresponds to the detected intensity level.
Claim 26
Dependent Claim
96 words
A musical tone generating apparatus according to claim 16 further comprising a tone color selection means for selecting a desired one of a plurality of tone colors to be given to said musical tone to output data representative of the selected tone color, said memory means storing said series of compressed waveform data with respect to each of said plurality of tone colors, said reading means being responsive to said data representative of the selected tone color to read the series of compressed waveform data corresponding to said selected tone color data from said memory means.
Claim 27
Dependent Claim
16 words
A waveform data processing system for a musical tone generating apparatus characterized by the provision of:
Claim 28
Dependent Claim
16 words
A waveform data processing system for a musical tone generating apparatus characterized by the provision of:
Claim 29
Dependent Claim
36 words
(1) dividing means for dividing a waveform of a musical tone, represented by a series of sample values of an amplitude of said musical tone, into a plurality of frames arranged in terms of time; and
Claim 30
Dependent Claim
36 words
(1) dividing means for dividing a waveform of a musical tone, represented by a series of sample values of an amplitude of said musical tone, into a plurality of frames arranged in terms of time; and
Claim 31
Dependent Claim
69 words
(2) predictive coefficient calculating means for calculating, with respect to each frame, a predictive coefficient from the sample values of said each frame, each of the predictive coefficients being for use in a predictive operation to be effected on the sample values of a respective one of said plurality of frames to calculate predicted values of said sample values, said predicted values representing an approximated waveform of said waveform.
Claim 32
Dependent Claim
69 words
(2) predictive coefficient calculating means for calculating, with respect to each frame, a predictive coefficient from the sample values of said each frame, each of the predictive coefficients being for use in a predictive operation to be effected on the sample values of a respective one of said plurality of frames to calculate predicted values of said sample values, said predicted values representing an approximated waveform of said waveform.
Claim 33
Dependent Claim
137 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) memory means for storing a series of compressed waveform data which have been obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by a predictive coding method; (2) coefficient generating means for generating predictive coefficient data representative of a predictive coefficient of a first predictive operation to be used in said predictive coding method, said predictive coefficient data varying in accordance with a lapse of time; and (3) waveform data reproducing means for reproducing said series of waveform data from said compressed waveform data by effecting a second predictive operation on said compressed waveform data using said predictive coefficient data, said second predictive operation being related with said first predictive operation.
Claim 34
Dependent Claim
137 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) memory means for storing a series of compressed waveform data which have been obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by a predictive coding method; (2) coefficient generating means for generating predictive coefficient data representative of a predictive coefficient of a first predictive operation to be used in said predictive coding method, said predictive coefficient data varying in accordance with a lapse of time; and (3) waveform data reproducing means for reproducing said series of waveform data from said compressed waveform data by effecting a second predictive operation on said compressed waveform data using said predictive coefficient data, said second predictive operation being related with said first predictive operation.
Claim 35
Dependent Claim
183 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) memory means for storing a series of compressed waveform data which have been obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by a predictive coding method; (2) data providing means for providing replacement data; (3) reading means for repeatedly reading at least one portion of said series of compressed waveform data from said memory means, said replacement data corresponding to data preceding said at least one portion in time among said series of compressed waveform data; (4) circuit means responsive to said replacement data and said at least one portion for replacing the first compressed waveform data of said at least one portion with said replacement data to output a group of compressed waveform data; and (5) decoding.means for decoding said group of compressed waveform data by a decoding method corresponding to said predictive coding method to obtain a series of decoded waveform data, said musical tone being reproduced from said series of decoded waveform data.
Claim 36
Dependent Claim
183 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) memory means for storing a series of compressed waveform data which have been obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by a predictive coding method; (2) data providing means for providing replacement data; (3) reading means for repeatedly reading at least one portion of said series of compressed waveform data from said memory means, said replacement data corresponding to data preceding said at least one portion in time among said series of compressed waveform data; (4) circuit means responsive to said replacement data and said at least one portion for replacing the first compressed waveform data of said at least one portion with said replacement data to output a group of compressed waveform data; and (5) decoding.means for decoding said group of compressed waveform data by a decoding method corresponding to said predictive coding method to obtain a series of decoded waveform data, said musical tone being reproduced from said series of decoded waveform data.
Claim 37
Dependent Claim
55 words
A musical tone generating apparatus according to claim 26, wherein said predictive coding method uses a linear predictive operation which is effected on said series of waveform data to produce a series of predicted waveform data, said compressed waveform data being obtained from said series of waveform data and said series of predicted waveform data.
Claim 38
Dependent Claim
184 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) memory means for storing a series of compressed waveform data which have been obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by a differential quantization method; (2) data providing means for providing replacement data; (3) reading means for repeatedly reading at least one portion of said series of compressed waveform data from said memory means, said replacement data corresponding to data preceding said at least one portion in time among said series of compressed waveform data; (4) circuit means responsive to said replacement data and said at least one portion for replacing the first compressed waveform data of said at least one portion with said replacement data to output a group of compressed waveform data; and (5) decoding means for decoding said group of compressed waveform data by a decoding method corresponding to said differential quantization method to obtain a series of decoded waveform data, said musical tone being reproduced from said series of decoded waveform data.
Claim 39
Dependent Claim
184 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) memory means for storing a series of compressed waveform data which have been obtained by compressing a series of waveform data representative of instantaneous values of a waveform of a musical tone by a differential quantization method; (2) data providing means for providing replacement data; (3) reading means for repeatedly reading at least one portion of said series of compressed waveform data from said memory means, said replacement data corresponding to data preceding said at least one portion in time among said series of compressed waveform data; (4) circuit means responsive to said replacement data and said at least one portion for replacing the first compressed waveform data of said at least one portion with said replacement data to output a group of compressed waveform data; and (5) decoding means for decoding said group of compressed waveform data by a decoding method corresponding to said differential quantization method to obtain a series of decoded waveform data, said musical tone being reproduced from said series of decoded waveform data.
Claim 40
Dependent Claim
55 words
A musical tone generating apparatus according to claim 28, wherein said differential quantization method uses at least one of the delta modulation operation, the adaptive delta modulation operation, the differential pulse code modulation and the adaptive differential pulse code modulation which is effected on said series of waveform data to produce said compressed waveform data.
Claim 41
Dependent Claim
107 words
A waveform data processing system for a musical tone generating apparatus characterized by the provision of: (1) approximated waveform data generating means for generating a series of approximated data of a series of waveform data, representative of instantaneous values of a musical tone waveform, by effecting a predictive operation and a differential quantization operation on a predetermined ones of said series of waveform data, said series of approximated data representing an approximated waveform of said musical tone waveform; and (2) operation means for effecting a predetermined operation on said series of waveform data and said series of approximated data to produce a series of compressed waveform data.
Claim 42
Dependent Claim
107 words
A waveform data processing system for a musical tone generating apparatus characterized by the provision of: (1) approximated waveform data generating means for generating a series of approximated data of a series of waveform data, representative of instantaneous values of a musical tone waveform, by effecting a predictive operation and a differential quantization operation on a predetermined ones of said series of waveform data, said series of approximated data representing an approximated waveform of said musical tone waveform; and (2) operation means for effecting a predetermined operation on said series of waveform data and said series of approximated data to produce a series of compressed waveform data.
Claim 43
Dependent Claim
28 words
A waveform data processing system according to claim 30 further comprising sampling means for sampling said waveform of said musical tone to produce said series of waveform data.
Claim 44
Dependent Claim
39 words
A waveform data processing system according to claim 30, wherein said predetermined operation is a subtracting operation for subtracting said series of approximated data respectively from said series of waveform data to produce said series of compressed waveform data.
Claim 45
Dependent Claim
138 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) memory means for storing a series of compressed waveform data which have been obtained by compressing a series of waveform data, representative of instantaneous values of a waveform of a musical tone, by effecting a predictive operation and a differential quantization operation on a predetermined ones of said series of waveform data; (2) reading means for reading said series of compressed waveform data from said memory means; and (3) decoding means for decoding said read series of compressed waveform data by effecting operations corresponding respectively to said predictive operation and said differential quantization operation on said read series of compressed waveform data to obtain a series of decoded waveform data, said musical tone being reproduced from said series of decoded waveform data.
Claim 46
Dependent Claim
138 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) memory means for storing a series of compressed waveform data which have been obtained by compressing a series of waveform data, representative of instantaneous values of a waveform of a musical tone, by effecting a predictive operation and a differential quantization operation on a predetermined ones of said series of waveform data; (2) reading means for reading said series of compressed waveform data from said memory means; and (3) decoding means for decoding said read series of compressed waveform data by effecting operations corresponding respectively to said predictive operation and said differential quantization operation on said read series of compressed waveform data to obtain a series of decoded waveform data, said musical tone being reproduced from said series of decoded waveform data.
Claim 47
Dependent Claim
28 words
A musical tone generating apparatus according to claim 33 further comprising sampling means for sampling said waveform of said musical tone to produce said series of waveform data.
Claim 48
Dependent Claim
56 words
A musical tone generating apparatus according to claim 33 further including subtracting operation means for subtracting a series of approximated data, which represent approximated version of said series of waveform data, obtained by said predictive operation and said differential quantization operation respectively from said series of waveform data to produce said series of compressed waveform data.
Claim 49
Dependent Claim
189 words
A waveform data processing system for a musical tone generating apparatus characterized by the provision of: (1) approximated waveform data generating means for generating a series of approximated data of a series of waveform data, representative of instantaneous values of a waveform of a musical tone, by effecting a predictive operation and a differential quantization operation on a predetermined ones of said series of waveform data, said series of approximated data representing an approximated waveform of said musical tone waveform; (2) operation means for effecting a predetermined operation on said series of waveform data and said series of approximated data to produce a series of compressed waveform data; (3) memory means for storing said series of compressed waveform data; (4) reading means for reading said series of compressed waveform data from said memory means; and (5) decoding means for decoding said read series of compressed waveform data by effecting operations corresponding respectively to said predictive operation and said differential quantization operation on said read series of compressed waveform data to obtain a series of decoded waveform data, said musical tone being reproduced from said series of decoded waveform data.
Claim 50
Dependent Claim
189 words
A waveform data processing system for a musical tone generating apparatus characterized by the provision of: (1) approximated waveform data generating means for generating a series of approximated data of a series of waveform data, representative of instantaneous values of a waveform of a musical tone, by effecting a predictive operation and a differential quantization operation on a predetermined ones of said series of waveform data, said series of approximated data representing an approximated waveform of said musical tone waveform; (2) operation means for effecting a predetermined operation on said series of waveform data and said series of approximated data to produce a series of compressed waveform data; (3) memory means for storing said series of compressed waveform data; (4) reading means for reading said series of compressed waveform data from said memory means; and (5) decoding means for decoding said read series of compressed waveform data by effecting operations corresponding respectively to said predictive operation and said differential quantization operation on said read series of compressed waveform data to obtain a series of decoded waveform data, said musical tone being reproduced from said series of decoded waveform data.
Claim 51
Dependent Claim
39 words
A musical tone generating apparatus according to claim 36, wherein said operation means includes subtracting operation means for subtracting said series of approximated data respectively from said series of waveform data to produce said series of compressed waveform data.
Claim 52
Dependent Claim
158 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) operation means for operating a series of waveform data representative of instantaneous values of a waveform of a musical tone and a series of predicted data of said series of waveform data to output a series of operated waveform data; (2) first processing means having first compressing means for compressing said series of operated waveform data to output a series of first compressed waveform data and first reproducing means for reproducing said series of operated waveform data by performing an inverse operation of said first compressing means on said series of first compressed waveform data; and (3) second processing means having second compressing means for compressing said reproduced series of operated waveform data to produce a series of second compressed waveform data and for supplying said series of second compressed waveform data to said operation means as said series of predicted data.
Claim 53
Dependent Claim
158 words
A musical tone generating apparatus for an electronic musical instrument characterized by the provision of: (1) operation means for operating a series of waveform data representative of instantaneous values of a waveform of a musical tone and a series of predicted data of said series of waveform data to output a series of operated waveform data; (2) first processing means having first compressing means for compressing said series of operated waveform data to output a series of first compressed waveform data and first reproducing means for reproducing said series of operated waveform data by performing an inverse operation of said first compressing means on said series of first compressed waveform data; and (3) second processing means having second compressing means for compressing said reproduced series of operated waveform data to produce a series of second compressed waveform data and for supplying said series of second compressed waveform data to said operation means as said series of predicted data.
Claim 54
Dependent Claim
28 words
A musical tone generating apparatus according to claim 38 further comprising sampling means for sampling said waveform of said musical tone to produce said series of waveform data.
Claim 55
Dependent Claim
102 words
A musical tone generating apparatus according to claim 3 8 further characterized by the provision of: memory means for storing said series of second compressed waveform data; reading means for reading said series of second compressed waveform data from said memory means; and tone reproducing means for reproducing said series of waveform data by effecting operations inversely corresponding to those effected by said first compressing means and said second compressing means on said read series of second compressed waveform data to obtain a series of tone reproducing waveform data, said musical tone being reproduced from said series of tone reproducing waveform data.
Claim 56
Dependent Claim
49 words
A musical tone generating apparatus according to claim 38, wherein the operation performed by said operation means is a subtracting operation for subtracting said series of predicted data of said series of waveform data respectively from said series of waveform data to produce said series of operated waveform data.
References Cited (Backward Citations)
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