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 Title: |
US3971284:
Plural mode envelope generator for voltage controlled amplifier
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Schreier, Wilford R.; Bensenville, IL
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| Assignee: |
Hammond Corporation, Chicago, IL
other patents from HAMMOND CORPORATION (239340) (approx. 47)
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| Published / Filed: |
1976-07-27
/ 1975-03-03
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| Application Number: |
US1975000554437
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| IPC Code: |
Advanced:
G10H 1/057;
G10H 1/22;
Core:
more...
IPC-7:
G10H 1/02;
G10H 5/02;
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| ECLA Code: |
G10H1/057; G10H1/22;
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| U.S. Class: |
Current:
084/702;
084/701;
984/322;
984/339;
Original:
084/001.26;
084/001.13;
084/001.24;
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| Field of Search: |
084/1.01,1.13,1.24,1.26
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| Priority Number: |
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| Abstract: |
A plural mode envelope generator in which a basic time constant circuit is coupled by selector switches to a plurality of envelope generating means which function under the control of one or both of a keydown detector and a legato pulse generator. Fast attack-short substain and slow attack-long sustain envelope circuits involve standard techniques. A dual mode percussion circuit provides post key release sustain in one mode when the keydown detector is decoupled from the circuit and post key release tone snubbing when the keydown detector is coupled to the circuit. A sostenuto circuit with flip-flop latch includes a reset gate to hold the flip-flop in reset until sostenuto keying is desired whereupon a unidirectional circuit couples the initial keydown signal to the latch to place the flip-flop in a set state but prevents the disappearance of that signal from resetting the latch.
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| Attorney, Agent or Firm: |
Bergstedt, Lowell C. ;
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| Primary / Asst. Examiners: |
Hix, L. T.; Witkowski, Stanley J.
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
This application is a continuation-in-part of my earlier, co-pending application Ser. No. 447,905, filed Mar. 4, 1974 entitled "A monophonic Electronic Musical Instrument", now U.S. Pat. No. 3,898,905.
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| Family: |
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First Claim:
Show all 6 claims |
I claim:
1. In combination in an electronic musical instrument:
- a plurality of selectively actuable control elements for controlling the sounding of musical notes;
- a keydown detector for detecting when any one of said control elements is actuated to produce a keydown signal;
- a legato pulse generator for producing a legato pulse signal each time an additional one of said control elements is effectively actuated;
- a tone signal generator coupled to said control elements for producing electrical tone signals in response to actuation thereof;
a voltage controlled amplifier for gating said electrical tone signals to an output circuit; and
- voltage envelope control circuitry for said voltage controlled amplifier comprising:
- a basic time constant circuit comprising an input lead, an output lead coupled to said voltage controlled amplifier, and a resistor and capacitor coupled in parallel between said input and output leads and ground;
- a plurality of envelope signal generating means coupled individually to one or both of said keydown detector and said legato pulse generator, each adapted to be operatively coupled to said input lead of said basic time constant circuit to produce a different envelope signal on said output lead thereof; and
- selector circuit means for selectively coupling individual ones of said envelope signal generating means to said input lead.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
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