Patent
Computor organ using parallel processing
R Deutsch
- 17 Oct 1972
36
TL;DR: Parallel processing is used in a computor organ of the type wherein musical notes are produced by computing at regular time intervals the amplitudes at successive points of a musical waveshape, and converting the amplitude to tones as the computations are carried out.
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Abstract: Parallel processing is used in a computor organ of the type wherein musical notes are produced by computing at regular time intervals the amplitudes at successive points of a musical waveshape, and converting the amplitudes to tones as the computations are carried out. Each amplitude is evaluated by concurrently calculating in parallel channels different subsets of the Fourier components for the same point, then combining the components to obtain the waveshape amplitude. In a typical embodiment, low order harmonic components are calculated in one channel and high order harmonics in another channel; in another embodiment, odd and even harmonics are calculated in separate, parallel channels. A recirculating shift register, shifted in unison with successive component calculations, advantageously stores the harmonic coefficients used in the amplitude calculations.
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Citations
Electronic musical instrument
Nagai Youhei,Okamoto Shimaji +1 more
TL;DR: In this article, the tone signal generated by one of the tone generators is passed through a frequency shifter, while the tone generated by the rest of the keyers is not, and then the two signals are mixed together and finally transduced into sound by a loudspeaker.
711
Polyphonic tone synthesizer
Deutsch Ralph,Leslie J. Deutsch +1 more
TL;DR: In this article, a master data set is created repetitively and independently of tone generation by computing a generalized Fourier algorithm using stored sets of generalized Fourier coefficients, and circuitry is included to provide time-varying modulations of the synthesized tonal structure.
38
Patent
Voicing for a computor organ
Ralph Deutsch
- 16 May 1974
TL;DR: In this article, a computor organ of the type wherein a musical wavehape is synthesized by computing in real time the amplitude contributions of the constituent Fourier components and summing these to obtain each wave-hape sample point amplitude, the tonal quality or voice of the produced note is established by a set of harmonic coefficients that specify the relative amplitude of each Fourier component.
31
Patent
Apparatus for processing music as data
Stephen A Davis,Keith H Dougherty,Thomas A. Hendrickson,Alan D Levit,Kenneth Russell Sanderson +4 more
- 02 Jan 1974
TL;DR: In this paper, a musical instrument such as an organ with a keyboard is attached to a data processing system and the interface between the instrument and the computer includes means for converting electrical signals produced by depressing the keys on the instrument to data in a format suitable for processing.
29
Patent
Harmonic modulation and loudness scaling in a computer organ
Ralph Deutsch
- 19 Apr 1974
TL;DR: In this paper, a computor organ of the type where successive sample point amplitudes of a musical waveshape are computed in real time and converted to musical tones is implemented. And the amplitude envelope of the generated tone is established by a set of scale factors S(t) that vary in value during attack and decay.
28
References
Patent
Multiplexing system for selection of notes and voices in an electronic musical instrument
George A Watson
- 30 Oct 1969
TL;DR: In this paper, the gating of pulses into time slots of a time division multiplex signal is modelled in accordance with a desired assignment sequence to correspond to the keys and to be representative thereof for identifying each note capable of being generated by the organ.
114
Patent
Method and apparatus for addressing a memory at selectively controlled rates
George A. Watson
- 10 Nov 1969
TL;DR: In this paper, the authors present an approach for addressing the memory at any of a plurality of selectively controlled rates, including a calculator for continuously computing a set of numbers each defining a different spacing between the data during readout of the memory.
64
Patent
Apparatus for storing and reading out periodic waveforms
TL;DR: In this paper, a system for storing and reading out periodic wavehapes was proposed, which utilizes the even and/or odd symmetry of a waveform in such a way that only sample points for one-half of the waveform need be stored in a memory device.
60
Patent
Multiplexed pitch generator system for use in a keyboard musical instrument
Ralph Deutsch
- 04 Oct 1971
TL;DR: In this paper, a cyclic pitch generator system for a keyboard musical instrument is presented, where a plurality of keys are provided with each time slot corresponding to one particular key, and each key corresponding to a particular note.
47
Patent
Digital organ system
Alvan Donald Arsem,Harold O Schwartz +1 more
- 12 Nov 1970
TL;DR: In this paper, an electronic keyboard musical instrument, specifically an organ, is indicated by a corresponding one or more binary numbers, which in turn respectively control variable clocks, and the outputs of the variable clocks are applied to shift registers.
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