Footage volume control circuit
First Claim
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1. A programmable source of analog information comprising:
- a matrix having a plurality of switches distributed along a first axis and along a second axis;
the switches distributed along said second matrix axis corresponding to respective different pulse amplitudes;
scanning means for interrogating successive groups of said matrix switches, the switches of any one group all having the same position along said first matrix axis;
a read/write digital memory having a plurality of addresses;
switch means for selecting among different groups of said memory addresses;
means responsive to said scanning means to write data into and read data out of successive memory addresses in the currently selected group of memory addresses during write cycles and read-out cycles of said memory respectively;
means responsive to said scanning means for entering the successive pulse amplitude values obtained from said matrix into successive ones of the currently selected group of memory addresses in digital form during write cycles of said memory;
and digital-to-analog converter means responsive to read-out cycles of said memory to translate each of the pulse amplitudes specified in said successive memory addresses from digital to voltage analog form.
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Abstract
This is an electronic organ drawbar circuit in which selection of the footage volumes is accomplished by means of a switch matrix; and sets of footage/volume correlations so chosen are stored in a memory. Another group of switches is used to select among several different memory fields, so that various sets of footage/volume data can be stored while another set of data is in use, and each stored set can be recalled for subsequent re-use.
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Citations
15 Claims
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1. A programmable source of analog information comprising:
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a matrix having a plurality of switches distributed along a first axis and along a second axis; the switches distributed along said second matrix axis corresponding to respective different pulse amplitudes; scanning means for interrogating successive groups of said matrix switches, the switches of any one group all having the same position along said first matrix axis; a read/write digital memory having a plurality of addresses; switch means for selecting among different groups of said memory addresses; means responsive to said scanning means to write data into and read data out of successive memory addresses in the currently selected group of memory addresses during write cycles and read-out cycles of said memory respectively; means responsive to said scanning means for entering the successive pulse amplitude values obtained from said matrix into successive ones of the currently selected group of memory addresses in digital form during write cycles of said memory; and digital-to-analog converter means responsive to read-out cycles of said memory to translate each of the pulse amplitudes specified in said successive memory addresses from digital to voltage analog form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In an electronic musical instrument, a programmable source of footage volume information comprising:
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a matrix having a plurality of switches distributed along a first axis and along a second axis; the switches distributed along said second matrix axis corresponding to respective different sound volumes; the switches distributed along said first matrix axis corresponding to respective different footages; scanning means for interrogating successive groups of said matrix switches, the switches of any one group all representing the same footage; a read/write digital memory having a plurality of addresses; switch means for selecting among different groups of said memory addresses; means responsive to said scanning means to write data into and read data out of successive memory addresses in the currently selected group of memory addresses during write cycles and read-out cycles of said memory respectively; means responsive to said scanning means for entering the successive sound volume values obtained from said matrix into successive ones of the currently selected group of memory addresses in digital form during write cycles of said memory; and digital-to-analog converter means responsive to read-out cycles of said memory to translate each of the sound volumes specified in said successive memory addresses from digital to voltage analog form.
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Specification