US4419919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic musical instrument
Assignee: Casio Computer Co Ltd
•
Filing: 1981-06-18
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Granted: 1983-12-13
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Expires: 2001-06-18
Abstract
Abstract An electronic musical instrument comprises a plurality of musical tone control units each having a tone waveform producing circuit, a volume envelope circuit, a filter circuit and other circuits. A given musical tone data can be preset in each musical tone control unit. Musical tone signals produced by the musical tone control units are synthesized to provide an effective musical tone.
Inventors
- 👤 Toshio Kashio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:54
CPC Classifications
G; G10; G10H; G10H7/00; G10H7/02; G10H7/04; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/057; G10H1/0575; G10H1/06; G10H1/08; Y; Y10; Y10S; Y10S84/00; Y10S84/09
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
182 words
A digital electronic musical instrument comprising: a keyboard including a set of performance keys; a plurality of musical tone generating means, each of said musical tone generating means being of substantially the same circuit structure, and each of said musical tone generating means being constituted by one LSI chip; each of said musical tone generating means including a waveform generating means for digitally generating a waveform signal; and a volume envelope controlling means coupled to said waveform generating means for digitally controlling a volume envelope and for generating an envelope-controlled waveform signal; means coupled to said plurality of musical tone generating means for operating all of the musical tone generating means upon operation of said performance keys; a plurality of digital-analog converter means, coupled to each of said musical tone generating means correspondingly, for converting said envelope-controlled waveform signal into an analog signal; filter means coupled to said plurality of digital-analog converter means for filtering said analog signal; and output means coupled to said filter means for synthesizing the musical tone signals from said filter means to thereby provide a musical tone.
Claim 2
Dependent Claim
182 words
A digital electronic musical instrument comprising: a keyboard including a set of performance keys; a plurality of musical tone generating means, each of said musical tone generating means being of substantially the same circuit structure, and each of said musical tone generating means being constituted by one LSI chip; each of said musical tone generating means including a waveform generating means for digitally generating a waveform signal; and a volume envelope controlling means coupled to said waveform generating means for digitally controlling a volume envelope and for generating an envelope-controlled waveform signal; means coupled to said plurality of musical tone generating means for operating all of the musical tone generating means upon operation of said performance keys; a plurality of digital-analog converter means, coupled to each of said musical tone generating means correspondingly, for converting said envelope-controlled waveform signal into an analog signal; filter means coupled to said plurality of digital-analog converter means for filtering said analog signal; and output means coupled to said filter means for synthesizing the musical tone signals from said filter means to thereby provide a musical tone.
Claim 3
Dependent Claim
35 words
A digital electronic musical instrument according to claim 1, wherein each of said musical tone generating means has means for digitally delaying the start of generating a musical tone by a desired period of time.
Claim 4
Dependent Claim
17 words
A digital electronic musical instrument according to claim 2, wherein two musical tone generating means are provided.
Claim 5
Dependent Claim
45 words
A digital electronic musical instrument according to claim 3, wherein one of said musical tone generating means has means for digitally storing data representing a consonant volume variation, and the other musical tone generating means has means for digitally storing data representing vowel volume variation.
Claim 6
Dependent Claim
40 words
A digital electronic musical instrument according to claim 1, wherein two musical tone generating means are provided, and further comprising means in one of said musical tone generating means to generate a musical tone signal representing a tone with vibrato.
Claim 7
Dependent Claim
31 words
A digital electronic musical instrument according to claim 1, further comprising means for designating a ratio at which the musical tone signals delivered from said musical tone generating means are synthesized.
Claim 8
Dependent Claim
32 words
A digital electronic musical instrument according to claim 1, wherein said filter means includes means in which there is preset a binary code to define the frequency range of the filter means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |