Electrical audio signal processing systems and devices – Sound effects – Reverberators
Patent
1995-01-31
1997-02-11
Kuntz, Curtis
Electrical audio signal processing systems and devices
Sound effects
Reverberators
381 68, 330284, H04R 2500
Patent
active
056029250
ABSTRACT:
A hearing aid houses an integrated circuit having at least one programmable resistor for setting the audio response of the hearing aid. The programmable resistor has at least 14 discrete steps of programmed resistance. In a first embodiment of the programmed resistor, the difference in programmed resistance between successive steps changes logarithmically and a second embodiment has the difference in programmed resistance between successive steps changing logarithmically for the higher values of programmed resistance and changing linearly for the lower values of programmed resistance. The programmable resistor is connected between two terminals and comprises at least seven subcircuits. Each subcircuit comprises a resistor and a switch sharing a common node, the first of the subcircuits has one end connected to the first terminal. A second subcircuit is connected between the common node of the first subcircuit and the second terminal and the common node of the second subcircuit is connected to the other end of the first subcircuit. A third subcircuit is connected between the common node of the second subcircuit and the second terminal. There are four or more other subcircuits which are each connected between the first and the second terminals. A decoder circuit receives a control word and decodes the control word into set of control bits, each control bit connected to each of the switches.
REFERENCES:
patent: 4882762 (1989-11-01), Waldhauer
patent: 5140283 (1992-08-01), Reed
patent: 5201009 (1993-04-01), Yamada et al.
Etymotic Research Inc.
Kuntz Curtis
Le Huyen D.
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