EP0150736A2
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EP
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Tone signal generation device for an electronic musical instrument
Assignee: Yamaha Corp
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Filing: 1985-01-11
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Granted: —
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Expires: 2005-01-11
Abstract
Abstract A musical tone signal generator for an electronic musical instrument is constructed by a waveshape generator (13, 14), a function generator (16) and an interpolator (18, 19, 20). The waveshape generator (13, 14) successively generates adjacent two waveshapes of a plurality of different waveshapes which have been intermittently sampled in an actual produced tone. The function generator (16) generates an interpolation function which is a function of time. The interpolator (18, 19, 20) weights the adjacent two waveshapes in accordance with the interpolation function, combines the weighted two waveshapes and outputs the combined waveshape as a musical tone waveshape to be produced at a rate corresponding to a frequency of the musical tone waveshape. In the waveshape generator (13, 14), the generation of next two adjacent waveshapes are performed when a value of the interpolation function has become equal to a predetermined value. As a result, it is made possible to obtain a good quality timewise spectrum change of the musical tone waveshape.
Inventors
- 👤 Junichi C/O Nippon Gakki Seizo K.K. Fujimori
- 👤 Jun C/O Nippon Gakki Seizo K.K. Sugiyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 20:34
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/06; G10H1/08; G10H7/00; G10H7/008
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
163 words
A tone signal generation device comprising: waveshape generating means capable of generating first to Nth waveshapes which are different each other for generating the Mth and (M+l)th waveshapes from among said first to Nth waveshapes wherein N is a positive integer greater than or equal to 3 and M is a positive integer less than or equal to N-2; function generating means for generating a weighting function which is a function of time; interpolation means connected to said waveshape generating means for weighting said Mth and (M+l)th waveshapes in accordance with a weighting value representing a value of said weighting function and for outputting the weighted waveshapes at a rate corresponding to a frequency of a musical tone to be produced as a tone signal of said musical tone; and control means for outputting a control signal in relation with said weighting value, said waveshape generating means generating said (M+l)th waveshape successively and the (M+2)th waveshape newly in response to said control signal.
Claim 2
Dependent Claim
163 words
A tone signal generation device comprising: waveshape generating means capable of generating first to Nth waveshapes which are different each other for generating the Mth and (M+l)th waveshapes from among said first to Nth waveshapes wherein N is a positive integer greater than or equal to 3 and M is a positive integer less than or equal to N-2; function generating means for generating a weighting function which is a function of time; interpolation means connected to said waveshape generating means for weighting said Mth and (M+l)th waveshapes in accordance with a weighting value representing a value of said weighting function and for outputting the weighted waveshapes at a rate corresponding to a frequency of a musical tone to be produced as a tone signal of said musical tone; and control means for outputting a control signal in relation with said weighting value, said waveshape generating means generating said (M+l)th waveshape successively and the (M+2)th waveshape newly in response to said control signal.
Claim 3
Dependent Claim
39 words
A tone signal generation device as defined in claim 1 wherein said control means comprises detecting means for detecting whether said weighting value coincides with a predetermined value, said control signal being outputted in response to the detection result.
Claim 4
Dependent Claim
32 words
A tone signal generation device as defined in claim 1 or 2 wherein said first to Nth waveshapes are parts which are intermittently sampled in a waveshape of an actually produced tone.
Claim 5
Dependent Claim
42 words
A tone signal generation device as defined in claim 1, 2 or 3 wherein said function generating means comprises function memory means for storing said weighting function and function readout means for reading out said weighting function from said function memory means.
Claim 6
Dependent Claim
36 words
A tone signal generation device as defined in any one of claims 1 to 4 wherein said weighting function for said Mth and (M+l)th waveshapes differs from the weighting function for said (M+l)th and (M+2)th waveshapes.
Claim 7
Dependent Claim
33 words
A tone signal generation device as defined in any one of claims 1 to 4 wherein said function generating means comprises counting means for generating a time function for establishing said weighting function.
Claim 8
Dependent Claim
61 words
A tone signal generation device as defined in claim 6 wherein said counting means comprises counting rate control means for controlling switching of a counting rate in response to said control signal and a counting circuit performing a counting operation in accordance with this counting rate and generating the time function in response to a count resulting from the counting operation.
Claim 9
Dependent Claim
74 words
A tone signal generation device as defined in claim 7 wherein said counting rate control means counts the number of times the control signal has been output and designates the counting rate corresponding to the counted number of times and said counting circuit performs counting from a first predetermined value to a second predetermined value at said designated counting rate and produces the time function corresponding to the count value resulting from this counting.
Claim 10
Dependent Claim
75 words
A tone signal generation device as defined in claim 8 wherein said counting rate control means comprise a counter for counting the number of times the control signal has been output and a change rate memory for reading out predetermined numerical data in response to the number of times counted by this counter, said numerical data read out from the change rate memory being counted repeatedly at a predetermined time interval in said counting circuit.
Claim 11
Dependent Claim
59 words
A tone signal generation device as defined in claim 7 wherein said counting rate control means comprises first means for generating predetermined initial numerical data and second means for sequentially changing this initial numerical data in response to the control signal and said counting circuit repeatedly counts output numerical data of this second means at a predetermined time interval.
Claim 12
Dependent Claim
66 words
A tone signal generation device as defined in any one of claims 1 to 10 wherein said waveshape generating means comprises memory means for storing waveshape data which comprises first to Nth waveshape data corresponding to said first to Nth waveshapes respectively; and readout means for reading out the Mth and (M+l)th waveshape data from among said first to Nth waveshape data from said memory means.
Claim 13
Dependent Claim
113 words
A tone signal generation device as defined in any one of claims 1 to 10 wherein said waveshape generating means comprises parameter memory means for storing first to Nth sets of parameters which determine said first to Nth waveshapes respectively; parameter readout means for reading out the Mth and (M+l)th sets of parameters from among said first to Nth sets of parameters from said parameter memory means; and waveshape forming means capable of forming first to Nth waveshapes corresponding to said first to Nth parameters for receiving said Mth and (M+l)th sets of parameters and outputting the Mth and (M+l)th waveshapes formed through arithmetic operation based on said Mth and (M+l)th parameters respectively.
Claim 14
Dependent Claim
49 words
A tone signal generation device as defined in any one of claims 1 to 10 wherein said waveshape generating means further generates an attack portion waveshape before generation of said first to Nth waveshapes, said attack portion waveshape being an attack portion of a waveshape of said tone signal.
Claim 15
Dependent Claim
92 words
A tone signal generation device as defined in claim 12 wherein said waveshape forming means comprises harmonics generating means for generating first to Kth harmonics wherein K is a positive integer greater than or equal to 2, said Mth set of parameters comprising first to Kth harmonic parameters which represent relative amplitudes of said first to Kth harmonics respectively; and operating means for multiplying said first to Kth harmonics with said first to Kth harmonic parameters respectively, for adding the multiplied harmonics and for outputting the added result as said Mth waveshape.
Claim 16
Dependent Claim
61 words
A tone signal generation device as defined in claim 12 wherein said waveshape forming means comprises tone source waveshape generating means for generating a tone source waveshape; and digital filter means for filtering said tone source waveshape in accordance with filter characteristic determined by said Mth set of parameters and for outputting the filtered tone source waveshape as said Mth waveshape.
Claim 17
Dependent Claim
172 words
A tone signal generation device comprising: waveshape generating means for generating a first waveshape and a second waveshape; function generating means for generating a first weighting function and a second weighting function, a value of said first weighting function varying from a first value to a second value along a first curve for a predetermined period, a value of said second weighting function varying from said second value to said first value along a second curve for said predetermined period, said second curve having a shape reversed said first.curve; and interpolation means connected to said waveshape generating means for weighting said first waveshape in accordance with a weighting value representing said value of said first weighting function, for weighting said second waveshape in accordance with a weighting value representing said value of said second weighting function, for combining the weighted first and second waveshapes and for outputting the combined waveshape at a rate corresponding to a frequency of a musical tone to be produced as a tone signal of said musical tones.
Claim 18
Dependent Claim
172 words
A tone signal generation device comprising: waveshape generating means for generating a first waveshape and a second waveshape; function generating means for generating a first weighting function and a second weighting function, a value of said first weighting function varying from a first value to a second value along a first curve for a predetermined period, a value of said second weighting function varying from said second value to said first value along a second curve for said predetermined period, said second curve having a shape reversed said first.curve; and interpolation means connected to said waveshape generating means for weighting said first waveshape in accordance with a weighting value representing said value of said first weighting function, for weighting said second waveshape in accordance with a weighting value representing said value of said second weighting function, for combining the weighted first and second waveshapes and for outputting the combined waveshape at a rate corresponding to a frequency of a musical tone to be produced as a tone signal of said musical tones.
Claim 19
Dependent Claim
74 words
A tone signal generation device as defined in claim 16 wherein said function generating means comprises function memory means for storing said first weighting function and function readout means for reading out said first weighting function in a forward direction from said function memory means to generate said first weighting function and for reading out said first weighting function in a reverse direction from said function memory means to generate said second weighting function.
Claim 20
Dependent Claim
64 words
l8. A tone signal generation device as defined in claim 17 wherein said function readout means comprises address generation means for generating an address signal which changes timewise and inverting means for inverting the value of this address signal and performs the reading out in a forward direction and in a reverse direction respectively by an inverted address signal and an uninverted address signal.
Claim 21
Dependent Claim
37 words
A tone signal generation device as defined in claim 17 wherein said function memory means stores a plurality of said functions and selects a predetermined function in response to a tone color selection or other selection operation.
Claim 22
Dependent Claim
131 words
A tone signal generation device comprising: waveshape generating means for generating a first waveshape and a second waveshape whose fundamental frequencies are same, phase difference between Nth harmonics of said first and second waveshapes being provided wherein N is a positive integer; function generating means for generating a weighting function; and interpolation means connected to said waveshape generating means for weighting said first and second waveshapes in accordance with a weighting value representing a value of said weighting function, for combining the weighted waveshapes and for outputting the combined waveshape at a rate corresponding to a frequency of a musical tone to be produced as a tone signal of said musical tone so that said musical tone has a nonharmonic component whose frequency is beside the frequencies of said Nth harmonics.
Claim 23
Dependent Claim
131 words
A tone signal generation device comprising: waveshape generating means for generating a first waveshape and a second waveshape whose fundamental frequencies are same, phase difference between Nth harmonics of said first and second waveshapes being provided wherein N is a positive integer; function generating means for generating a weighting function; and interpolation means connected to said waveshape generating means for weighting said first and second waveshapes in accordance with a weighting value representing a value of said weighting function, for combining the weighted waveshapes and for outputting the combined waveshape at a rate corresponding to a frequency of a musical tone to be produced as a tone signal of said musical tone so that said musical tone has a nonharmonic component whose frequency is beside the frequencies of said Nth harmonics.
References Cited (Backward Citations)
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