US3740450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for simulating chiff in a sampled amplitude electronic organ
Assignee: Boeing North American Inc
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Filing: 1971-12-06
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Granted: 1973-06-19
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Expires: 1991-12-06
Abstract
Abstract A sampled amplitude electronic organ embodies first and second memories storing groups of amplitude samples that, respectively, delineate energy levels of the wave shape of a musical tone, and energy levels of the wave shape having the dominant energy of a third harmonic or its equivalent of the musical tone. The groups of amplitude samples are read out at rates determined according to actuation of a number of keyboard switches so that the repetition rate of the group as read from the memory is the chosen frequency of the musical tone to be produced by operation of an actuated keyboard switch. The two groups of amplitude samples are added for about the first seven cycles of read out to thereby introduce a transient chiffing wave to the initial portion of the primary tone to be generated.
Inventors
- 👤 R Deutsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:04
CPC Classifications
G; G10; G10H; G10H1/00; G10H1/02; G10H1/06; G10H1/14; G10H1/04; G10H1/053; G10H1/057; G10H7/00; G10H7/02; G10H7/04; Y; Y10; Y10S; Y10S84/00; Y10S84/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
The method of simulating chiff in an amplitude sample musical tone generation system comprising the steps of generating repetitive groups of primary amplitude sample representations collectively delineating the wave shape of a musical tone, said groups being generated at a group repetition rate that determines frequency of the musical tone, generating repetitive groups of chiff amplitude sample representations collectively delineating the wave shape having a dominant harmonic of the fundamental of the tone to be generated, combining said groups of chiff amplitude sample representations with said groups of primary amplitude sample representations only during an initial transient period of the generation of said groups of primary amplitude sample representations, and producing an electrical signal representing said primary amplitude sample representations as modified by transient combination with said chiff amplitude sample representations.
Claim 2
Independent Claim
131 words
The method of simulating chiff in an amplitude sample musical tone generation system comprising the steps of generating repetitive groups of primary amplitude sample representations collectively delineating the wave shape of a musical tone, said groups being generated at a group repetition rate that determines frequency of the musical tone, generating repetitive groups of chiff amplitude sample representations collectively delineating the wave shape having a dominant harmonic of the fundamental of the tone to be generated, combining said groups of chiff amplitude sample representations with said groups of primary amplitude sample representations only during an initial transient period of the generation of said groups of primary amplitude sample representations, and producing an electrical signal representing said primary amplitude sample representations as modified by transient combination with said chiff amplitude sample representations.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said step of adding is initiated substantially simultaneously with initiation of generation of said groups of amplitude sample representations.
Claim 4
Dependent Claim
40 words
The method of claim 1 wherein said step of combining said chiff and primary amplitude sample representations is caused to terminate at the end of an interval that varies in accordance with the frequency of the tone to be generateD.
Claim 5
Dependent Claim
59 words
The method of claim 1 wherein said step of combining said chiff and primary amplitude sample representations comprises the steps of storing said chiff amplitude sample representations, reading said chiff amplitude sample representations from storage, and inhibiting said reading of chiff amplitude sample representations when the combining of said primary and chiff amplitude signal representations is to be terminated.
Claim 6
Dependent Claim
45 words
The method of claim 1 wherein said step of combining chiff and primary amplitude sample representations comprises the steps of counting groups of said primary amplitude sample representations and inhibiting said combining when a predetermined number of said groups of primary representations has been counted.
Claim 7
Dependent Claim
187 words
An electrical musical instrument comprising a first memory for storing a first group of amplitude sample representations delineating energy levels of a complex wave form, a second memory storing a second group of amplitude sample representations delineating energy levels of a wave shape having a dominant harmonic of said complex wave form, memory addressing means including a sample point address register for simultaneously and repetitively addressing both said first and second memories to cyclically read out therefrom both said first and second groups of amplitude sample representations at said repetitive address rate, means for selectively inhibiting read out of said second memory, a cycle counter connected to count cycles of said sample point address register, means for initiating counting of said cycle counter, means responsive to attainment of a preselected count by said cycle counter for actuating said inhibit means to inhibit read out from said second memory, means for adding first and second groups of amplitude sample representations read out of said first and second memories, and means responsive to said adding means for producing a combined output signal including an initial third harmonic transient thereon.
Claim 8
Dependent Claim
187 words
An electrical musical instrument comprising a first memory for storing a first group of amplitude sample representations delineating energy levels of a complex wave form, a second memory storing a second group of amplitude sample representations delineating energy levels of a wave shape having a dominant harmonic of said complex wave form, memory addressing means including a sample point address register for simultaneously and repetitively addressing both said first and second memories to cyclically read out therefrom both said first and second groups of amplitude sample representations at said repetitive address rate, means for selectively inhibiting read out of said second memory, a cycle counter connected to count cycles of said sample point address register, means for initiating counting of said cycle counter, means responsive to attainment of a preselected count by said cycle counter for actuating said inhibit means to inhibit read out from said second memory, means for adding first and second groups of amplitude sample representations read out of said first and second memories, and means responsive to said adding means for producing a combined output signal including an initial third harmonic transient thereon.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |