US5136912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic tone generation apparatus for modifying externally input sound
Assignee: Casio Computer Co Ltd
•
Filing: 1991-03-01
•
Granted: 1992-08-11
•
Expires: 2011-03-01
Abstract
Abstract A tone generation control unit has four waveform read/write channels for selectively the reading or writing data in a waveform memory. A plurality of waveform signals stored in the waveform memory are converted into analog signals to be subjected to timbre and tone volume control through voltage-controlled filters and voltage-controlled amplifiers before being fed to a mixing adder. An output signal of the mixing adder is converted into a digital signal which is stored in the waveform memory again through processing of the tone generation control unit. The stored converted output from the mixing adder is later used again as a new sound source waveform which is operated on to produce tones.
Inventors
- 👤 Shigenori Morikawa
- 👤 Kohtaro Hanzawa
- 👤 Kazuhisa Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:37
CPC Classifications
G; G10; G10H; G10H5/00; G10H5/002; G10H7/00; G10H7/02; Y; Y10; Y10S; Y10S84/00; Y10S84/09
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
231 words
An electronic tone generation apparatus, for producing a modified waveform signal which corresponds to a modification of an external input sound signal, and for storing said modified waveform signal for future use in generating sounds, comprising: external signal input means for receiving an external analog input signal; sampling means coupled to said external signal input means for receiving said external analog input signal and for sampling said external analog input signal at a predetermined sampling frequency to produce a digital waveform signal; waveform memory means coupled to said sampling means for storing said digital waveform signal provided form said sampling means; signal modifying means coupled to said waveform memory means for reading out a digital waveform signal representing a waveform stored in the waveform memory means, and for modifying a timbre characteristic of said read-out digital waveform signal in a predetermined manner; means for supplying a modified waveform signal, derived from the signal modifying means, to the waveform memory means to store, for a later performance, a digital signal representing said modified waveform signal in the waveform memory means; and reading means coupled to said waveform memory means for reading out, at said later performance, the digital signal representing said modified waveform signal; said signal modifying means including filtering means for filtering the read-out digital waveform signal to change the timbre characteristic of the waveform represented by the digital waveform signal.
Claim 2
Dependent Claim
231 words
An electronic tone generation apparatus, for producing a modified waveform signal which corresponds to a modification of an external input sound signal, and for storing said modified waveform signal for future use in generating sounds, comprising: external signal input means for receiving an external analog input signal; sampling means coupled to said external signal input means for receiving said external analog input signal and for sampling said external analog input signal at a predetermined sampling frequency to produce a digital waveform signal; waveform memory means coupled to said sampling means for storing said digital waveform signal provided form said sampling means; signal modifying means coupled to said waveform memory means for reading out a digital waveform signal representing a waveform stored in the waveform memory means, and for modifying a timbre characteristic of said read-out digital waveform signal in a predetermined manner; means for supplying a modified waveform signal, derived from the signal modifying means, to the waveform memory means to store, for a later performance, a digital signal representing said modified waveform signal in the waveform memory means; and reading means coupled to said waveform memory means for reading out, at said later performance, the digital signal representing said modified waveform signal; said signal modifying means including filtering means for filtering the read-out digital waveform signal to change the timbre characteristic of the waveform represented by the digital waveform signal.
Claim 3
Dependent Claim
232 words
An electronic tone generation apparatus, in which an externally generated waveform signal is recorded in the form of a digital signal in a waveform memory means and the digital signal recorded in the waveform memory means is converted into a tone signal having a pitch, comprising: external signal input means for receiving an external analog input signal; means for converting said external analog input signal into a digital signal, and for storing said digital signal in said waveform memory means; control means including a plurality of waveform read channels for reading digital signal stored in said waveform memory means to obtain a plurality of tones simultaneously; signal modifying means coupled to said waveform memory means for reading out a digital signal representing a waveform stored in the waveform memory means, and for modifying a timbre characteristic of said read-out digital signal in a predetermined manner; means for supplying a modified waveform signal, derived from the signal modifying means, to the waveform memory means to store, for a later performance, a digital signal representing said modified waveform signal in the waveform memory means; and reading means coupled to said waveform memory means for reading out, at said later performance, the digital signal representing said modified waveform signal; said signal modifying mean including filtering means for filtering the read-out digital signal to change the timbre characteristic of the waveform represented by the digital signal.
Claim 4
Dependent Claim
232 words
An electronic tone generation apparatus, in which an externally generated waveform signal is recorded in the form of a digital signal in a waveform memory means and the digital signal recorded in the waveform memory means is converted into a tone signal having a pitch, comprising: external signal input means for receiving an external analog input signal; means for converting said external analog input signal into a digital signal, and for storing said digital signal in said waveform memory means; control means including a plurality of waveform read channels for reading digital signal stored in said waveform memory means to obtain a plurality of tones simultaneously; signal modifying means coupled to said waveform memory means for reading out a digital signal representing a waveform stored in the waveform memory means, and for modifying a timbre characteristic of said read-out digital signal in a predetermined manner; means for supplying a modified waveform signal, derived from the signal modifying means, to the waveform memory means to store, for a later performance, a digital signal representing said modified waveform signal in the waveform memory means; and reading means coupled to said waveform memory means for reading out, at said later performance, the digital signal representing said modified waveform signal; said signal modifying mean including filtering means for filtering the read-out digital signal to change the timbre characteristic of the waveform represented by the digital signal.
Claim 5
Dependent Claim
170 words
An electronic tone generation apparatus, for producing a modified waveform signal which corresponds to a modification of an external input sound signal, and for storing said modified waveform signal for future use in generating sounds, comprising: supplying means for supplying a digital waveform signal representing an original sound waveform; waveform memory means coupled to said supplying means for storing said digital waveform signal supplied from said supplying means; signal modifying means coupled to said waveform memory means for reading out a digital waveform signal representing a waveform stored in the waveform memory means, and for modifying at least one characteristic of said read-out digital waveform signal in a predetermined manner; means for supplying a modified waveform signal, derived form the signal modifying means, to the waveform memory means to store, for a later performance, a digital signal representing said modified waveform in the waveform memory means; and reading means coupled to said waveform memory means for reading out, at said later performance, the digital signal representing said modified waveform signal.
Claim 6
Dependent Claim
170 words
An electronic tone generation apparatus, for producing a modified waveform signal which corresponds to a modification of an external input sound signal, and for storing said modified waveform signal for future use in generating sounds, comprising: supplying means for supplying a digital waveform signal representing an original sound waveform; waveform memory means coupled to said supplying means for storing said digital waveform signal supplied from said supplying means; signal modifying means coupled to said waveform memory means for reading out a digital waveform signal representing a waveform stored in the waveform memory means, and for modifying at least one characteristic of said read-out digital waveform signal in a predetermined manner; means for supplying a modified waveform signal, derived form the signal modifying means, to the waveform memory means to store, for a later performance, a digital signal representing said modified waveform in the waveform memory means; and reading means coupled to said waveform memory means for reading out, at said later performance, the digital signal representing said modified waveform signal.
Claim 7
Dependent Claim
39 words
The electronic tone generation apparatus according to claim 3 wherein said signal modifying means includes a filtering means for filtering the read-out digital waveform signal to change the timbre characteristic of the waveform represented by the digital waveform signal.
Claim 8
Dependent Claim
18 words
The electronic tone generation apparatus according to claim 4, wherein said filtering means includes a voltage controlled filter.
Claim 9
Dependent Claim
28 words
The electronic tone generation apparatus according to claim 3, wherein said modifying means includes a voltage controlled amplifier for controlling the characteristic of the read-out digital waveform signal.
Claim 10
Dependent Claim
207 words
An electronic tone generation apparatus, in which an original sound waveform signal is recorded in the form of a digital signal in a waveform memory means and the digital signal recorded in the waveform memory means is converted into a tone signal having a designated pitch, comprising: supplying means for supplying a digital signal representing an original sound waveform; means for storing said digital signal supplied from said supplying means in said waveform memory means; control means including a plurality of waveform read channels for reading a digital signal stored in said waveform memory means at different rates to obtain a plurality of tones simultaneously; signal modifying means coupled to said waveform memory means for reading out a digital signal representing the original sound waveform stored in the waveform memory means, and for modifying a timbre characteristic of said read-out digital signal in a predetermined manner; means for supplying a modified waveform signal, derived from the signal modifying means, to the waveform memory means to store, for a later performance, a digital signal representing said modified waveform signal in the waveform memory means; and reading means coupled to said waveform memory means for reading out, at said later performance, the digital signal representing said modified waveform signal.
Claim 11
Dependent Claim
207 words
An electronic tone generation apparatus, in which an original sound waveform signal is recorded in the form of a digital signal in a waveform memory means and the digital signal recorded in the waveform memory means is converted into a tone signal having a designated pitch, comprising: supplying means for supplying a digital signal representing an original sound waveform; means for storing said digital signal supplied from said supplying means in said waveform memory means; control means including a plurality of waveform read channels for reading a digital signal stored in said waveform memory means at different rates to obtain a plurality of tones simultaneously; signal modifying means coupled to said waveform memory means for reading out a digital signal representing the original sound waveform stored in the waveform memory means, and for modifying a timbre characteristic of said read-out digital signal in a predetermined manner; means for supplying a modified waveform signal, derived from the signal modifying means, to the waveform memory means to store, for a later performance, a digital signal representing said modified waveform signal in the waveform memory means; and reading means coupled to said waveform memory means for reading out, at said later performance, the digital signal representing said modified waveform signal.
Claim 12
Dependent Claim
37 words
The electronic tone generation apparatus according to claim 7, wherein said signal modifying means includes a filtering means for filtering the read-out digital signal to change the timbre characteristic of the waveform represented by the digital signal.
Claim 13
Dependent Claim
18 words
The electronic tone generation apparatus according to claim 8, wherein said filtering means includes a voltage controlled filter.
Claim 14
Dependent Claim
27 words
The electronic tone generation apparatus according to claim 7, wherein said modifying means includes a voltage controlled amplifier for controlling the characteristic of the read-out digital signal.
References Cited (Backward Citations)
DE2553348A1
Cited
US4383462A
Cited
US4195544A
Cited
JPS54161313A
Cited
GB2023955A
Cited
JPS5516698A
Cited
JPS5528072A
Cited
US4461199A
Cited
US4305319A
Cited
US4422156A
Cited
US4442745A
Cited
US4351218A
Cited
US4472993A
Cited
US4479411A
Cited
DE3325658A1
Cited
US4539884A
Cited
EP0124197A2
Cited
EP0122634A2
Cited
US4502361A
Cited
JPS61120093A
Cited
US4622877A
Cited
US4785707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |