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US4350071A
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Automatic accompaniment circuit
Assignee: Kawai Musical Instruments Manufacturing Co Ltd
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Filing: 1981-04-03
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Granted: 1982-09-21
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Expires: 2001-04-03
Abstract
Abstract An automatic accompaniment circuit which is provided with a code detector for scanning key switches to detect the code of a depressed one of the key switches, a latch circuit for latching the output signal of the code detector by a bar clock pulse which is produced for each bar, a comparator for comparing the output signals of the code detector and the latch circuit to yield a coincidence signal, and control means for counting the coincidence signal from the comparator by a desired number of bars using the bar clock pulses and then providing a command signal for changing the pattern of an automatic accompaniment.
Inventors
- 👤 Nobuaki Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:13
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/36; G10H1/40; Y; Y10; Y10S; Y10S84/00; Y10S84/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
An automatic accompaniment circuit comprising: a code detector for scanning key switches to detect the code of a depressed one of the key switches; a latch circuit for latching the output signal of the code detector by a bar clock pulse which is produced for each bar; a comparator for comparing the output signals of the code detector and the latch circuit to yield a coincidence signal; and control means for counting the coincidence signal from the comparator by a desired number of bars using the bar clock pulses and then providing a command signal for changing the pattern of an automatic accompaniment.
Claim 2
Dependent Claim
103 words
An automatic accompaniment circuit comprising: a code detector for scanning key switches to detect the code of a depressed one of the key switches; a latch circuit for latching the output signal of the code detector by a bar clock pulse which is produced for each bar; a comparator for comparing the output signals of the code detector and the latch circuit to yield a coincidence signal; and control means for counting the coincidence signal from the comparator by a desired number of bars using the bar clock pulses and then providing a command signal for changing the pattern of an automatic accompaniment.
Claim 3
Dependent Claim
24 words
An automatic accompaniment circuit according to claim 1 wherein the bar clock pulses are each generated in synchronism with the start of each bar.
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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) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |