US3933072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Generator for producing tones of a musical scale in an electronic musical instrument
Assignee: US Philips Corp
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Filing: 1974-10-24
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Granted: 1976-01-20
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Expires: 1994-10-24
Abstract
Abstract Generator for producing the tones of a musical scale in electronic musical instruments, one master oscillator driving a chain of frequency dividers in a manner such that at the output of each divider a tone is produced which is lower by a semi-tone than the tone at the input of the divider, the final divider of the chain being connected to the input of the first divider via a frequency multiplier which multiplies by a factor of 2, while the master oscillator can be connected to any one of the dividers, in which case the connection of this divider to the preceding one is broken in order to permit transposition without the use of additional dividers.
Inventors
- 👤 David Josephus van der Wal
- 👤 Frans Grotepas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:12
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/18; G10H1/20; Y; Y10; Y10S; Y10S84/00; Y10S84/11
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
Generator for producing tones of a musical scale in electronic musical instruments of the type which comprises one master oscillator and a plurality of frequency converters equal in number to the number of tones per octave, which frequency converters each have an input and at least a first output, the first output of each frequency converter being connected to the input of the next subsequent frequency converter while the input of the first frequency converter is connected to the master oscillator, the improvement comprising a frequency multiplier that multiplies by a factor of 2, means connecting the first output of the final frequency converter to the input of the first frequency converter through said frequency multiplier, and means for switching the master oscillator to the input of any one of the frequency converters and for disconnecting this input from the preceding frequency converter.
Claim 2
Dependent Claim
143 words
Generator for producing tones of a musical scale in electronic musical instruments of the type which comprises one master oscillator and a plurality of frequency converters equal in number to the number of tones per octave, which frequency converters each have an input and at least a first output, the first output of each frequency converter being connected to the input of the next subsequent frequency converter while the input of the first frequency converter is connected to the master oscillator, the improvement comprising a frequency multiplier that multiplies by a factor of 2, means connecting the first output of the final frequency converter to the input of the first frequency converter through said frequency multiplier, and means for switching the master oscillator to the input of any one of the frequency converters and for disconnecting this input from the preceding frequency converter.
Claim 3
Dependent Claim
54 words
Generator as claimed in claim 1, wherein said means for switching comprises a change-over switch, the input of each frequency converter being connected to the input of said change-over switch which has a first output connected to the master oscillator and a second output connected to the first output of the preceding frequency converter.
Claim 4
Dependent Claim
32 words
Generator as claimed in claim 2, wherein all the change-over switches are intercoupled, and further comprising a locking device which permits the master oscillator to be connected to one frequency converter only.
Claim 5
Dependent Claim
23 words
Generator as claimed in claim 1, wherein the switches are electronic switches, touch contacts for operating said switches, said switches being electronically interlocked.
Claim 6
Dependent Claim
44 words
Generator as claimed in claim 1, wherein the input of each frequency converter is connected to the output of the preceding frequency converter and in that the voltage of the master oscillator is greater than the output voltage of each of the frequency converters.
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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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |