US4573389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Musical tone generation device of waveshape memory type
Assignee: Nippon Gakki Co Ltd
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Filing: 1984-02-29
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Granted: 1986-03-04
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Expires: 2004-02-29
Abstract
Abstract A musical tone generation device of waveshape memory type stores, in its memory, waveshape data of an entire part of a rising portion of a musical tone waveshape and waveshape data of only a part of a remainder portion succeeding to the rising portion. The rising portion data is read out once while the remainder portion data is repetitively read out from the memory thereby to reproduce the entire musical tone waveshape. By changing a rate for the repetitive readout operation, a pitch of the musical tone waveshape at the portion succeeding to the rising portion can be changed with passage of time.
Inventors
- 👤 Norio Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:33
CPC Classifications
G; G10; G10H; G10H7/00; G10H7/02; G10H7/04; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/057; G10H1/0575
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
194 words
A musical tone generation device of waveshape memory type for generating a musical tone waveshape which comprises rising portion correspoding to a rise-up of the waveshape and a portion succeeding to the rising portion, said device comprising: memory means for storing first waveshape data which represent an entire part of the rising portion of a musical tone waveshape and second waveshape data which represent only a part of the portion of the waveshape succeeding to the rising portion; readout means for reading out said first waveshape data to form the rising portion of a waveshape to be generated and for repetitively reading out said second data to form said succeeding portion of the waveshape to be generated; and rate control means, associated with said readout means, for controlling the rate for reading out said second data from said memory means so as to establish a pitch of the generated tone waveshape at the portion succeeding to the rising portion, which pitch corresponds generally to one musical tone name, and for varying said readout rate with the lapse of time so as to to cause a corresponding variation of said pitch with passage of time.
Claim 2
Dependent Claim
194 words
A musical tone generation device of waveshape memory type for generating a musical tone waveshape which comprises rising portion correspoding to a rise-up of the waveshape and a portion succeeding to the rising portion, said device comprising: memory means for storing first waveshape data which represent an entire part of the rising portion of a musical tone waveshape and second waveshape data which represent only a part of the portion of the waveshape succeeding to the rising portion; readout means for reading out said first waveshape data to form the rising portion of a waveshape to be generated and for repetitively reading out said second data to form said succeeding portion of the waveshape to be generated; and rate control means, associated with said readout means, for controlling the rate for reading out said second data from said memory means so as to establish a pitch of the generated tone waveshape at the portion succeeding to the rising portion, which pitch corresponds generally to one musical tone name, and for varying said readout rate with the lapse of time so as to to cause a corresponding variation of said pitch with passage of time.
Claim 3
Dependent Claim
24 words
A device accoding to claim 1, in which said rate control means provides a rate which varies to be slow with passage of time.
Claim 4
Dependent Claim
24 words
A device according to claim 1, in which said rate control means provides a rate which varies to be fast with passage of time.
Claim 5
Dependent Claim
93 words
A device according to claim 1, in which said memory means comprises a plurality of memory locations which are accessible by said readout means, said first and second waveshape data being stored at the respective memory locations selected at a certain order, and said readout means reads out according to said certain order the first waveshape data stored at some of said memory locations and repetitively reads out the second waveshape data in some of said memory locations according to said certain order and according to a rate specified by said control means.
Claim 6
Dependent Claim
115 words
A device according to claim 4, in which said readout means comprises: a presettable address counter for generating address data to access said memory means; an address detector for detecting that said address counter outputs end address data which correspond to an end address of said second waveshape data stored in said memory means according to said certain order; and a repeat address generator for generating repeat address data which correspond to a start address of said second waveshape according to said certain order, said repeat address being preset in said address counter upon detection of the end address data by said detector so that the readout means repetitively reads out the second waveshape data.
Claim 7
Dependent Claim
69 words
A device according to claim 5, in which said control means comprises; a variable frequency divider for frequency-dividing a pulse signal to generate a clock pulse to drive said address counter; and a data generator for generating dividing factor data which determine a dividing factor of said frequency divider and which vary with passage of time, thereby causing said clock pulse to vary in frequency with passage of time.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |