High Shelf Filter

Overview

High shelf second-order IIR (Infinite Impulse Response) filter. All frequencies above the shelving frequency are either boosted or attenuated by the specified gain in decibels. This filter is embodied by the highshelf class.

Include

#include <q/fx/biquad.hpp>

Declaration

struct highshelf : biquad
{
         highshelf(double db_gain, frequency f, float sps, double q = 0.707);
   void  config(double db_gain, frequency f, float sps, double q = 0.707);
};

Expressions

In addition to valid expressions for biquad, highshelf allows these expressions.

Notation

hs

Object of type highshelf.

f

Object of type frequency.

sps

Floating point value representing samples per second.

q

Q or quality factor.

g

gain (in decibels).

a [, b, c, d]

Required a, optional b, c, d.

Constructor

Expression Semantics

highshelf(g, f, sps [, q])

Construct a highshelf from g, f, sps and optional q (defaults to 0.707).
C++ brace initialization may also be used.

Mutators

Expression Semantics

hs.config(g, f, sps [, q])

Configure a highshelf from g, f, sps and optional q (defaults to 0.707).