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Audio Signal Processing

Tube-emulator-amplifier-system

High-power waveform generator

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OF INVENTION While the present invention will be described more fully hereinafter with reference ...

Tube emulator amplifier system

Details

Inventors: Pritchard, Eric K.;
Assignee:
Primary Examiner: Isen; Forester W.
Assistant Examiner:
Attorney, Agent or Firm: Barnes & Thornburg

This invention is an emulation of vacuum tube guitar amplifier with devices that emulate vacuum tube plate voltage and current characteristics. This amplifier system has a switching system for selecting preamplifiers and which alters the behavior of the output stage by changing features such as feedback and compression character. The preamplifier and output stages use non-linear means for the emulation of triode amplifiers, cathode followers, phase splitters, and pentode amplifiers. The features emulated are the grid conduction with scaling and offsetting, current gain, plate voltage and current characteristics, and compression.

DETAILED DESCRIPTION I claim: 1.
A solid state audio amplifier means for emulating a tube amplifier having a preamplifier means and output means for driving a load; wherein said preamplifier means includes tone control means; and wherein said output means includes means for emulating grid conduction and pentode output voltage and current characteristics.
2.
The amplifier means of claim 1 which includes triode emulation means having plate, grid, and cathode terminals including a transistor means having a base connected to said grid terminal, an emitter connected to said cathode terminal, and a first collector connected to said plate terminal by a first resistor.
3.
The amplifier means of claim 2 wherein said transistor means has a second collector connected to said plate terminal.
4.
The amplifier means of claim 2 wherein said transistor means includes a second transistor having a base connected to said grid terminal, a collector connected to the plate terminal, and an emitter connected to said cathode by a second resistor and the emitter of the transistor means is connected to said cathode by a third resistor.
5.
The amplifier means of claim 1 which includes resistance means having a large thermal resistance coefficient to produce a resistance which varies with signal strength and thereby alter the gain of said amplifier means.
6.
The amplifier means of claim 1 which includes non-linear means for emulating the plate resistance.
7.
The amplifier means of claim 1 which includes non-linear means for creating harmonics without clipping.
8.
The amplifier means of claim 1 including non-linear means having first and second terminals comprising: first resistor means connected to said first terminal and diode means connected to said second terminal in series for converting the voltage between said terminals to a diode voltage; and first transistor having a base terminal connected to said diode means, an emitter terminal connected to said second terminal, and a collector terminal connected to said first terminal for converting said diode voltage to a current having a non-linear relationship between said terminals

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