The input circuit selectively boosts the relatively broad bands of bass and treble frequencies and controls the corner frequency of each by adjusting the feedback through branch 18. H03G5/025- Equalizers Volume or gain control in limited frequency bandsÄETAILED DESCRIPTION Audio frequency signals at an input 10 of the graphic equalizer system are translated through an input circuit 12 to a graphic equalizer network 14.H03G5/00- Tone control or bandwidth control in amplifiers.audio preamplifiers with semiconductor devices only H03F3/183- Low frequency amplifiers, e.g.H03F3/181- Low frequency amplifiers, e.g.H03F3/00- Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements.239000002131 composite material Substances 0.000 description 2. 238000003199 nucleic acid amplification method Methods 0.000 description 6.230000005540 biological transmission Effects 0.000 description 6.230000001276 controlling effect Effects 0.000 claims description 12.238000005859 coupling reaction Methods 0.000 claims description 16.238000010168 coupling process Methods 0.000 claims description 16.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority claimed from US25542872A external-priority Application filed by INTERN RADIO AND ELECTRONICS COR filed Critical INTERN RADIO AND ELECTRONICS COR Application granted granted Critical Publication of US3750044A publication Critical patent/US3750044A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Original Assignee INTERN RADIO AND ELECTRONICS COR Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number Inventor G Stanley Current Assignee (The listed assignees may be inaccurate. Google Patents Graphic equalizer circuitÄownload PDF Info Publication number US3750044A US3750044A US3750044DA US3750044A US 3750044 A US3750044 A US 3750044A US 3750044D A US3750044D A US 3750044DA US 3750044 A US3750044 A US 3750044A Authority US United States Prior art keywords input graphic equalizer output amplifier frequencies Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3750044A - Graphic equalizer circuit
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