Patent US4048608A successfully refreshed from Google Patents.
Patent EP0206786A2 successfully refreshed from Google Patents.
EP0206786A2
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Tone signal generation device
Assignee: Yamaha Corp
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Filing: 1986-06-20
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Granted: —
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Expires: 2006-06-20
Abstract
Abstract A tone generation (10) includes a plurality of tone generation channels each comprising one or more operation channels (OP1-OPx). One operation channel performs basic operation of a tone signal computing operation (e.g., FM or AM) and a tone signal is generated by using one or more operation channels for one tone generation channel. Tone generation channels in the tone generator are established according to a selected performance mode. In a first mode, the operation channels are divided into N groups and N tone generation channels are established in correspondence to the respective operation channel groups. In a second mode, the operation channels are divided into M groups and M tone generation channels are established in correspondence to the respective operation channel groups wherein N is a different number from M. Tone generation channels of the number required according to the selected performance mode can be established by efficiently utilizing the operation channels of a limited number.
Inventors
- 👤 Yasuji Uchiyama
- 👤 Shigeru Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 09:34
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/18; G10H1/183; G10H1/188
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
A tone signal generation device having a plurality of tone generation channels, comprising: tone generation operation means including a predetermined number of operation channels for tone signal computation and generating a tone signal by performing a specific tone generation operation employing one or more of said operation channels for one tone generation channel, thereby providing said plurality of tone generation channels; mode selection means for selecting one mode from among a plurality of modes; and channel establishing means for dividing said operation channels into plural groups in a predetermined manner in accordance with the mode selected by said mode selection means and establishing said tone generation channels each constituted by each of the operation channel groups, the number of said groups being different depending upon the mode to change the number of the tone generation channels in said tone generation operation means in accordance with the selected mode.
Claim 2
Dependent Claim
148 words
A tone signal generation device having a plurality of tone generation channels, comprising: tone generation operation means including a predetermined number of operation channels for tone signal computation and generating a tone signal by performing a specific tone generation operation employing one or more of said operation channels for one tone generation channel, thereby providing said plurality of tone generation channels; mode selection means for selecting one mode from among a plurality of modes; and channel establishing means for dividing said operation channels into plural groups in a predetermined manner in accordance with the mode selected by said mode selection means and establishing said tone generation channels each constituted by each of the operation channel groups, the number of said groups being different depending upon the mode to change the number of the tone generation channels in said tone generation operation means in accordance with the selected mode.
Claim 3
Dependent Claim
66 words
A tone signal generation device as defined in claim 1 wherein said channel establishing means comprises tone assignment means for assigning tones to be generated to the tone generation channels established in accordance with the mode selected by said mode selection means and parameter supply means for supplying operation parameters to the respective operation channels in the tone generation channels established according to the selected mode.
Claim 4
Dependent Claim
74 words
A tone signal generation device as defined in claim 1 wherein said mode selection means selects either a first mide or a second mode, and said channel establishing means divides the operation channels into N groups in said first mode to establish N tone generation channels corresponding to the respective groups and divides the operation channels into M groups in said second mode to establish M tone generation channels corresponding to the respective groups.
Claim 5
Dependent Claim
65 words
A tone signal generation device as defined in claim 3 wherein in said second mode, an operation channel group corresponding to a tone generation channel among the N tone generation channels in said first mode is divided into at least two and independent tone generation channels are established for respective divided groups thereby to establish a total of M (N < M) tone generation channels.
Claim 6
Dependent Claim
107 words
A tone signal generation device as defined in claim 1 wherein in said first mode, the number of the operation channels for each of the tone generation channels is equal among the respective tone generation channels and tone signals thereby are generated with a common tone color in the respective tone generation channels whereas in said second mode, there is a tone generation channel whose number of the operation channels is different from those of the other tone generation channels whereby the tone signals generated in the tone generation channels whose number of the operation channels differ from each other have different tone colors from each other.
Claim 7
Dependent Claim
96 words
A tone signal generation device as defined in claim 5 wherein a waveshape of a waveshape signal used for the operation in the operation channels in said tone generation operation means can be changed in a specific phase section in response to a control signal and, in said second mode, the waveshape of the waveshape signal is changed by supplying the control signal to the operation channels in the tone generation channel in which the number of the operation channels is relatively small whereby harmonics components in the waveshape signal used for the operation are changed.
Claim 8
Dependent Claim
46 words
A tone signal generation device as defined in claim 1 wherein said tone generation operation means provides said operation channels of the predetermined number in the form of time division time slots by using a single basic tone generation operation circuit on a time shared basis.
Claim 9
Dependent Claim
36 words
A tone signal generation device as defined in claim 1 wherein each of said operation channels in said tone generation operation means performs basic operation of a tone generation system according to a frequency modulation operation.
Claim 10
Dependent Claim
36 words
A tone signal generation device as defined in claim 1 wherein each of said operation channels in said tone generation operation means peforms basic operation of a tone generation system according to an amplitude modulation operation.
Claim 11
Dependent Claim
86 words
A tone signal generation device as defined in claim 3 wherein said mode selection means includes an automatic performance selection switch and selects said first mode when a predetermined automatic performance has not been selected and selects said second mode when the automatic performance has been selected by said switch, a part of the tone generation channels established in said second mode being used as channels for the automatic performance and the rest of the tone generation channels being used as channels for a manual performance.
References Cited (Backward Citations)
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