Patent US5567900A successfully refreshed from Google Patents.
US5567900A
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Electronic tone generator system with CPU and DSP
Assignee: Yamaha Corp
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Filing: 1994-06-10
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Granted: 1996-10-22
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Expires: 2014-06-10
Abstract
Abstract A tone signal control system for controlling a tone signal supplied from a tone generator. The tone signal control system includes a CPU for executing a computational and control operation in accordance with an externally stored program, a DSP for executing a computational and control operation in accordance with an internally stored program, a memory accessible by both CPU and DSP, and an access controller for controlling an access by CPU and DSP to the memory. The access controller calculates a logical product of a clock signal, an access signal from CPU, and an access signal from DSP, and outputs the logical product as a CPU wait signal. The tone signal control system is not required to increase the number of pins too many even if CPU and DSP are assembled on a single chip.
Inventors
- 👤 Iwao Higashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:37
CPC Classifications
G; G10; G10H; G10H7/00; G10H7/002; G10H7/004; G10H2210/00; G10H2210/155; G10H2210/265; G10H2210/281
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
142 words
A tone signal control system for controlling a tone signal supplied from a tone generator, the system comprising: a central processing unit for executing a computational and control operation in accordance with an externally stored program; a digital signal processor for executing a computational and control operation in accordance with an internally stored program; a memory accessible by both said central processing unit and said digital signal processor, said central processing unit and said digital signal processor generating an access signal to access said memory; and access control means for controlling access by said central processing unit and said digital signal processor to said memory, said access control means giving an access priority to said digital signal processor when said access signal by said central processing unit and said access signal by said digital signal processor are generated at the same time.
Claim 2
Dependent Claim
142 words
A tone signal control system for controlling a tone signal supplied from a tone generator, the system comprising: a central processing unit for executing a computational and control operation in accordance with an externally stored program; a digital signal processor for executing a computational and control operation in accordance with an internally stored program; a memory accessible by both said central processing unit and said digital signal processor, said central processing unit and said digital signal processor generating an access signal to access said memory; and access control means for controlling access by said central processing unit and said digital signal processor to said memory, said access control means giving an access priority to said digital signal processor when said access signal by said central processing unit and said access signal by said digital signal processor are generated at the same time.
Claim 3
Dependent Claim
50 words
A tone signal control system according to claim 1, wherein said access control means includes concurrent access detection means for supplying a wait signal to said central processing unit when said access signals are generated from both said digital signal processor and said central processing unit at the same time.
Claim 4
Dependent Claim
42 words
A tone signal control system according to claim 2, wherein said concurrent access detection means includes an AND gate for calculating a logical product of said access signal by said digital signal processor and said access signal by said central processing unit.
Claim 5
Dependent Claim
70 words
A tone signal control system according to claim 2, further comprising a clock circuit for generating a clock signal controlling a plurality of operating timings of said digital signal processor and said central processing unit, said concurrent access detection means including an AND gate for calculating a logical product of said clock signal, said access signal by said digital signal processor, and said access signal by said central processing unit.
Claim 6
Dependent Claim
31 words
A tone signal control system according to claim 1, wherein said access control means includes means for inhibiting a transmission of an address signal from said central processing unto said memory.
Claim 7
Dependent Claim
32 words
A tone signal control system according to claim 4, wherein said access control means includes means for inhibiting a transmission of an address signal from said central processing unit to said memory.
Claim 8
Dependent Claim
34 words
A tone signal control system according to claim 1, wherein said digital signal processor stores a microprogram comprising a plurality of steps, and said digital signal processor executes said microprogram by a clock signal.
Claim 9
Dependent Claim
19 words
A tone signal control system according to claim 7, wherein said microprogram includes an access command to said memory.
Claim 10
Dependent Claim
144 words
An electronic musical instrument comprising: a central processing unit for executing a computational and control operation in accordance with an externally stored program; a digital signal processor for executing a computational and control operation in accordance with an internally stored program; a memory accessible by both said central processing unit and said digital signal processor, said central processing unit and said digital signal processor generating an access signal to access said memory; signal generating means for supplying a tone signal to said digital signal process for; and access control means for controlling an access by said central processing unit and said digital signal processor to said memory, said address control means giving an access priority to said digital signal processor when said access signal by said central processing unit and said access signal by said digital signal processor are generated at the same time.
Claim 11
Dependent Claim
144 words
An electronic musical instrument comprising: a central processing unit for executing a computational and control operation in accordance with an externally stored program; a digital signal processor for executing a computational and control operation in accordance with an internally stored program; a memory accessible by both said central processing unit and said digital signal processor, said central processing unit and said digital signal processor generating an access signal to access said memory; signal generating means for supplying a tone signal to said digital signal process for; and access control means for controlling an access by said central processing unit and said digital signal processor to said memory, said address control means giving an access priority to said digital signal processor when said access signal by said central processing unit and said access signal by said digital signal processor are generated at the same time.
Claim 12
Dependent Claim
17 words
An electronic musical instrument according to claim 9, further comprising delay means for delaying said tone signal.
Claim 13
Dependent Claim
15 words
An electronic musical instrument according to claim 9, wherein said delay means includes said memory.
Claim 14
Dependent Claim
20 words
An electronic musical instrument according to claim 10, wherein said memory includes a work memory for said central processing unit.
References Cited (Backward Citations)
US5200564A
Cited
US5376750A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-10-22 | 2000-04-22 | 2000-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-22 | 2004-04-22 | 2004-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-22 | 2008-04-22 | 2008-10-22 | $7700.00 | Window Closed / Lapsed |