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 Title: |
US5115705:
Modular electronic keyboard with improved signal generation
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Monte, Charles; San Rafael, CA 94901
White, Paul J.; Los Angeles, CA 90066
Graham, Anne C.; Los Angeles, CA 90066
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| Assignee: |
None
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| Published / Filed: |
1992-05-26
/ 1990-10-22
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| Application Number: |
US1990000600693
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| IPC Code: |
Advanced:
G10H 1/18;
G10H 1/34;
Core:
more...
IPC-7:
G10H 1/055;
G10H 1/18;
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| U.S. Class: |
Current:
084/617;
084/655;
084/658;
084/DIG.007;
338/069;
341/026;
341/027;
341/034;
Original:
084/617;
084/655;
084/658;
084/DIG.7;
338/069;
341/026;
341/027;
341/034;
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| Field of Search: |
084/617,626,655,658,682,687-690,21,22,DIG. 7,DIG. 19
338/069
341/026,34
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| Priority Number: |
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| Abstract: |
An improved percussive action electronic keyboard for play as a musical instrument of the type having pivoted playing keys having camming surfaces distal from finger contact surfaces thereof, pivoted hammers having cam follower surfaces for following the playing key camming surfaces, hammer stop for stopping the swing of the hammer in response to depression of its associated key, includes an electronic sensor for generating an electrical signal for each key which is related in amplitude to the pressure with which the key is depressed during play of the keyboard, and a scanning keyboard state monitor connected to said sensor including a keyboard scanner for scanning each of the keys of the keyboard to determine if a key event has occurred, an amplitude comparator for determining when a key depression causes a said key depression signal amplitude to pass predetermined minimum and maximum amplitude threshold values, a scan counter for counting the number of scans occurring between the scans when the key depression amplitude signal passes between the minimum and maximum amplitude threshold values and a digital output for putting out the number of scans as a digital value. A programmed microprocessor is connected to receive the digital value scan count for a key and converts the scan count into a key velocity signal. A keyboard setup memory is connected to the microprocessor for recording user provided setup parameters for operation of the keyboard, and the microprocessor is programmed to operate the keyboard in accordance with the setup parameters recorded in the keyboard setup memory. A programmable output path is connected to the microprocessor for putting out the key velocity signal to music generation equipment.
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| Attorney, Agent or Firm: |
Eakin, James E. ;
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| Primary / Asst. Examiners: |
Witkowski, Stanley J.;
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| Maintenance Status: |
E2 Expired Check current status
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Parent Case: |
This is a division of application Ser. No. 07/311,601, filed Feb. 16, 1989, U.S. Pat. No. 5,003,859.
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| Family: |
Show 2 known family members
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First Claim:
Show all 31 claims |
We claim:
1. A percussive action electronic keyboard for play as a musical instrument of the type having pivoted playing keys having camming surfaces distal from finger contact surfaces thereof, pivoted hammers having impact cam follower surfaces for following the playing key impact camming surfaces, hammer stop means for stopping the swing of the hammer in response to impact of its associated key, comprising:
- electronic sensor means for generating an electrical signal for each impacted key, the electrical signal a product of key impact relative to at least one key impact compensation means;
- scanning keyboard state monitoring means connected to said sensor means including keyboard scanner means for scanning each key of the keyboard to determine whether a key event has occurred, comparison means for determining when a key impact causes a key impact signal to exceed predetermined minimum and maximum threshold values, and scan counting means for counting the number of scans when the key impact amplitude signal passes between the minimum and maximum threshold values.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 27 U.S. patent(s) that reference this one
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