US3878749A
Expired / Lapsed
US
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Walsh function tone generator and system
Assignee: MUSICCO LLC
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Filing: 1972-12-12
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Granted: 1975-04-22
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Expires: 1992-12-12
Abstract
Abstract A Walsh function tone generator uses a summing means to sum a plurality of digital Walsh function signals to produce a tone output. The Walsh function generator may be comprised of a clock circuit, a plurality of frequency dividers for dividing the output of the clock circuit and a plurality of exclusive-OR gates for generating the various orders of the Walsh function signals. The summing means may include means for weighting the various orders of the Walsh function signals, such as weighting resistors. The Walsh function tone generator as used in an electronic musical instrument may be provided with bilateral electronic switches between the output of the Walsh function generator and the input of the summing means. The electronic switches may be used in conjunction with an attack and decay generator to provide an output wave form having the desired attack and decay characteristics. The purpose of the above abstract is to provide a non-legal technical statement of the disclosure of the contents of the instant patent application and thus serve as a searching-scanning tool for scientists, engineers and researchers. Accordingly, this abstract is not intended to be used in understanding or otherwise comprehending the principles of the present invention hereinafter described in detail, nor is it intended to be used in interpreting or in any way limiting the scope or fair meaning of the claims appended hereto.
Inventors
- 👤 Robert P Woron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:02
CPC Classifications
G; G10; G10H; G10H7/00; G10H7/08; Y; Y10; Y10S; Y10S84/00; Y10S84/23
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
69 words
Apparatus for producing a musical tone, comprising: clock means for generating a clock signal at a frequency which is a predetermined number times the fundamental frequency of the musical tone to be generated; means for receiving a clock signal and for generating a plurality of digital Walsh function signals; and means for summing predetermined ones of the plurality of digital Walsh function signals to produce a musical tone output.
Claim 2
Dependent Claim
69 words
Apparatus for producing a musical tone, comprising: clock means for generating a clock signal at a frequency which is a predetermined number times the fundamental frequency of the musical tone to be generated; means for receiving a clock signal and for generating a plurality of digital Walsh function signals; and means for summing predetermined ones of the plurality of digital Walsh function signals to produce a musical tone output.
Claim 3
Dependent Claim
69 words
Apparatus for producing a musical tone, comprising: clock means for generating a clock signal at a frequency which is a predetermined number times the fundamental frequency of the musical tone to be generated; means for receiving a clock signal and for generating a plurality of digital Walsh function signals; and means for summing predetermined ones of the plurality of digital Walsh function signals to produce a musical tone output.
Claim 4
Dependent Claim
69 words
Apparatus for producing a musical tone, comprising: clock means for generating a clock signal at a frequency which is a predetermined number times the fundamental frequency of the musical tone to be generated; means for receiving a clock signal and for generating a plurality of digital Walsh function signals; and means for summing predetermined ones of the plurality of digital Walsh function signals to produce a musical tone output.
Claim 5
Dependent Claim
36 words
Apparatus in accordance with claim 1 including means for weighting predetermined ones of said digital Walsh functions by predetermined amounts, said weighting means being connected between said digital walsh function generating means and said summing means.
Claim 6
Dependent Claim
27 words
Apparatus in accordance with claim 1 wherein said digital Walsh function signal generating means iNcludes means for generating a predetermined number of orders of cal function signals.
Claim 7
Dependent Claim
27 words
Apparatus in accordance with claim 1 wherein said digital Walsh function signal generating means includes means for generating a predetermined number of orders of sal function signals.
Claim 8
Dependent Claim
35 words
Apparatus in accordance with claim 1 wherein said digital Walsh function signal generating means includes means for generating a first predetermined number of cal function signals and a second predetermined number of sal function signals.
Claim 9
Dependent Claim
130 words
Apparatus for producing a musical tone, comprising: a clock circuit; a predetermined number of frequency dividers, said frequency dividers producing submultiples of the clock frequency output of said clock circuit; gating means for producing output signals in response to predetermined combinations of input signals from said clock circuit output and said frequency divider outputs to generate a predetermined number of orders of Walsh function signals; means for generating a modulating envelope for modulating the Walsh function signals; a predetermined number of electronic switch means, said electronic switch means receiving said modulating envelope, said electronic switch means gating the modulating envelope in response to predetermined ones of the output Walsh function signals of said gating means; and summing means, said summing means summing the gated outputs of said electronic switch means.
Claim 10
Dependent Claim
130 words
Apparatus for producing a musical tone, comprising: a clock circuit; a predetermined number of frequency dividers, said frequency dividers producing submultiples of the clock frequency output of said clock circuit; gating means for producing output signals in response to predetermined combinations of input signals from said clock circuit output and said frequency divider outputs to generate a predetermined number of orders of Walsh function signals; means for generating a modulating envelope for modulating the Walsh function signals; a predetermined number of electronic switch means, said electronic switch means receiving said modulating envelope, said electronic switch means gating the modulating envelope in response to predetermined ones of the output Walsh function signals of said gating means; and summing means, said summing means summing the gated outputs of said electronic switch means.
Claim 11
Dependent Claim
18 words
Apparatus in accordance with claim 6 including means for weighting the gated outputs of said electronic switch means.
Claim 12
Dependent Claim
12 words
Apparatus in accordance with claim 6 wherein said frequency dividers are flip-flops.
Claim 13
Dependent Claim
15 words
Apparatus in accordance with claim 6 wherein said gating means is comprised of exclusive-OR gates.
Claim 14
Dependent Claim
34 words
Apparatus in accordance with claim 6 wherein said electronic switch means receive the modulating envelope from an attack and decay generator, said attack and decay generator receiving a signal input from a key switch.
Claim 15
Dependent Claim
87 words
Apparatus in accordance with claim 9 wherein each of said electronic switch means is comprised of a first and a second electronic switch, said first and second electronic switches each being provided with an input, an output and gate terminal, the modulating envelope being applied to the input terminals of each of said first and second electronic switches, a predetermined Walsh function signal being applied to said gate terminal of said first electronic switch and said gate terminal of said second electronic switch through an inverter circuit.
Claim 16
Dependent Claim
13 words
Apparatus in accordance with claim 6 wherein said gating means produces sal signals.
Claim 17
Dependent Claim
22 words
Apparatus in accordance with claim 6 including inverters for inverting predetermined ones of the Walsh function signal outputs of said gating means.
Claim 18
Dependent Claim
63 words
Apparatus in accordance with claim 6 wherein said summing means includes an operational amplifier provided with a non-inverting input terminal and an inverting input terminal, predetermined ones of the gated outputs of said electronic switch means being applied to said non-inverting input terminal and other predetermined ones of the gated outputs of said electronic switch means being applied to said inverting input terminal.
Claim 19
Dependent Claim
155 words
An electronic musical instrument, comprising: a clock circuit; a top octave synthesizer, said top octave synthesizer receiving the output of said clock circuit and generating a predetermined number of frequency signal outputs having frequencies equal to N times the top octave frequencies; a predetermined number of sets of frequency dividers, one set of frequency dividers being provided for each top octave frequency signal output, each set of frequency dividers being provided with a predetermined number of frequency dividers; a predetermined number of Walsh function generators for generating Walsh function signals in response to predetermined combinations of the top octave frequency signal output and the outputs of the frequenCy dividers in a set; means for generating a modulating envelope for modulating the Walsh function signals; means for combining the modulating envelope with the Walsh function signals; means for summing the modulated Walsh function signals; and means for transducing the summed Walsh function signals into sound waves.
Claim 20
Dependent Claim
155 words
An electronic musical instrument, comprising: a clock circuit; a top octave synthesizer, said top octave synthesizer receiving the output of said clock circuit and generating a predetermined number of frequency signal outputs having frequencies equal to N times the top octave frequencies; a predetermined number of sets of frequency dividers, one set of frequency dividers being provided for each top octave frequency signal output, each set of frequency dividers being provided with a predetermined number of frequency dividers; a predetermined number of Walsh function generators for generating Walsh function signals in response to predetermined combinations of the top octave frequency signal output and the outputs of the frequenCy dividers in a set; means for generating a modulating envelope for modulating the Walsh function signals; means for combining the modulating envelope with the Walsh function signals; means for summing the modulated Walsh function signals; and means for transducing the summed Walsh function signals into sound waves.
Claim 21
Dependent Claim
26 words
An electronic musical instrument in accordance with claim 15 wherein said generating means generates a modulating signal to provide a desired attack and/or decay keying signal.
Claim 22
Dependent Claim
16 words
Apparatus in accordance with claim 15 including means for voicing the output of said summing means.
Claim 23
Dependent Claim
164 words
An electronic musical instrument, comprising: a plurality of tone generators, each of said plurality of tone generators providing a predetermined tone output in response to being keyed, each of said plurality of tone generators being provided with a clock circuit, a Walsh tone generator, a keying-modulating circuit and a summing circuit means, said clock circuit producing an output having a frequency equal to a predetermined number of times the basic tone frequency output of the tone generator, said Walsh signal generator receiving the output of said clock circuit, said keying-modulating circuit receiving an input from a key corresponding to the particular generator and the output of said Walsh signal generator, the output of the keying-modulating circuit being applied to a summing circuit means, said summing circuit means producing a predetermined tone output; amplifier means, said amplifier means receiving the tone output of each of said plurality of tone generators; and transducer means for converting the electrical output of said amplifier to a sound wave.
Claim 24
Dependent Claim
164 words
An electronic musical instrument, comprising: a plurality of tone generators, each of said plurality of tone generators providing a predetermined tone output in response to being keyed, each of said plurality of tone generators being provided with a clock circuit, a Walsh tone generator, a keying-modulating circuit and a summing circuit means, said clock circuit producing an output having a frequency equal to a predetermined number of times the basic tone frequency output of the tone generator, said Walsh signal generator receiving the output of said clock circuit, said keying-modulating circuit receiving an input from a key corresponding to the particular generator and the output of said Walsh signal generator, the output of the keying-modulating circuit being applied to a summing circuit means, said summing circuit means producing a predetermined tone output; amplifier means, said amplifier means receiving the tone output of each of said plurality of tone generators; and transducer means for converting the electrical output of said amplifier to a sound wave.
Claim 25
Dependent Claim
18 words
An electronic musical instrument in accordance with claim 18 wherein said summing circuit means includes a voicing 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) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |