Dynamic bass control circuit with variable cut-off frequency
AssigneeKoninklijke Philips Electronics N.V.
InventorWayne Milton Schott
Life of this patent
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Abstract
A circuit for providing a variable amount of bass control on an input signal dependent on a signal level of the input signal includes a high-pass filter, a variable impedance shunt connected to the output of the high-pass filter, and a signal level detector for controlling the variable impedance shunt. Depending on the signal level, the variable impedance shunt varies the Q value of the high-pass filter so that at low signal levels, the Q value is at its maximum while at high signal values, the Q value is lowered.
Claims4
A circuit for providing a variable amount of bass control on an input signal dependent on a signal level of said input signal, said circuit comprising:
- an input for receiving the input signal;
- high-pass filtering means coupled to said input, said high-pass filtering means having an output forming an output of said circuit;
- coupling means for coupling the output of said high-pass filtering means to ground, said coupling means having a variable impedance in response to a control signal, wherein said coupling means varies a Q value of said high-pass filtering means;
- and
- detecting means coupled to said input for detecting a signal level of said input signal, said detecting means generating said control signal for said coupling means in dependence on said detected signal level.
Dependencies are inferred from the claim text.