The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 1985
Filed:
Jun. 28, 1982
Douglas R Frey, Bethlehem, PA (US);
Other;
Abstract
A programmable adjustable distortion amplifier circuit has a first channel having an adjustable gain and a filter for filtering high and low frequency components of signal processed by the first channel, a second channel having an adjustable gain and a filter for filtering high and low frequency components of signal processed by the second channel, a parametric equalizer providing adjustable preselectable frequency bandwidth and a vacuum tube amplifier and support circuitry permitting adjustment of distortion of signal processed by the second channel by a preselected amount. An optional phase shift circuit delays a portion of signal processed by the second channel with the delayed portion provided to the second channel downstream of the parametric equalizer but upstream of the tube. A summing device combines output signals of the first and second channels for input to an adjustable gain control for subsequent input to audio speakers. Switches produce input signals for adjustably preselecting bandwidth of the parametric equalizer, amplitude of the parametric equalizer output and distortion introduced by the tube and support circuitry. A memory stores a plurality of input signals received from the switches and allows selection among the plurality of stored signals for input to the parametric equalizer and to the tube. These input signals control bandwidth of signal having amplitude controlled by the parametric equalizer, amplitude of the parametric equalizer output and the amount of distortion introduced by the tube. The individual circuit components may stand alone and function independently of one another.