Emulated guitar loudspeaker

Abstract

Circuitry is provided for simulating and emulating the sounds of a loudspeaker driven by a classic rock and roll guitar amplifier in the form of an electrical signal which, when input to a recording console or used to drive high fidelity headphones or a high quality monitor amplifier and monitor loudspeaker, accurately reproduces such sounds. The circuitry is incorporated at the output of a classic tube-type rock and roll guitar amplifier, and consists of three basic modules: a load impedance module (FIG. 3) designed to offer to the tube amplifier output a load impedance as a function of frequency (FIG. 1) which is modeled after and nearly identical (in both real and imaginary components) to the impedance of a classic rock and roll guitar speaker; a highpass filter circuit (24) which emulates the low frequency resonance and rolloff characteristics (FIG. 7) of a classic rock and roll open-back guitar speaker cabinet; and further filtering circuits (26, 30, 32, 34, 36, 40) which emulate the mid and high frequency characteristics (FIG. 7) of a classic rock and roll guitar loudspeaker. Electrical outputs (50) are provided for driving a recording mixer, headphones, a speaker, and an external power amplifier.

Dependencies are inferred from the claim text.