=  NOW 25 WPM  =  TEXT IS FROM AUGUST 2023  QST  PAGE 52 =

SHELVING EQUALIZATION SHELVING EQUALIZATION IS WHATS COMMONLY THOUGHT OF AS
BASS AND TREBLE CONTROLS ON A STEREO RECEIVER, AND IS ONE OF THE MOST
COMMONLY AVAILABLE EQUALIZATION CONTROLS IN MANY HAM TRANSCEIVERS.  THIS
ISNT A VERY FLEXIBLE TYPE OF EQUALIZATION, IN THAT IT USUALLY HAS A FIXED
HINGE POINT.  ITS WHERE THE BOOST OR CUT FREQUENCY BEGINS.  EVERYTHING
ABOVE OR BELOW THAT FREQUENCY IS INCREASED OR DECREASED, AND THE FARTHER
THE FREQUENCY IS FROM THE HINGE, USUALLY THE GREATER THE INCREASE OR
DECREASE.  THERE ARE OTHER TYPES OF SHELVING EQUALIZATION, BUT THEYRE NOT
GENERALLY FOUND IN HAM RADIO.  GRAPHIC EQUALIZER MOVING UP THE EQUALIZATION
SCALE, WE COME TO THE GRAPHIC EQUALIZER.  THIS IS WHERE THE AUDIO SPECTRUM
IS DIVIDED INTO A NUMBER OF SEGMENTS, EACH HAVING A CONTROL POTENTIOMETER
TO ADJUST THAT PARTICULAR SEGMENT OF THE AUDIO BANDWIDTH.  THERE ARE A
NUMBER OF VARIATIONS OF THIS EQUALIZER DESIGN.  THE MOST COMMON ARE THE 1
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