Method for dynamically adjusting gain of parametric equalizer according to input signal, dynamic parametric equalizer and dynamic parametric equalizer system employing the same
AssigneeNeofidelity, Inc.
InventorsYeongha Choi, Duckhwan Kim
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Abstract
The present invention relates to a method for dynamically adjusting a gain of parametric equalizer according to an input signal, a dynamic parametric equalizer employing the same and a dynamic parametric equalizer system employing the same wherein a gain of parametric equalizer is dynamically adjusted according to a level of an input digital audio signal to prevent distortion of output signal.
Claims18
A parametric equalizer having a transfer function H(z) with a preset gain G as a parameter, the parametric equalizer dynamically adjusting the preset gain G, the parametric equalizer comprising:
- a first signal processing unit having a transfer function H1, the first signal processing unit being configured to process an input digital audio signal X according to the transfer function H1 and output a first output signal obtained by processing the input digital audio signal X;
- a second signal processing unit having a transfer function H2 of a level Gin of the first output signal, the second signal processing unit being configured to process the first output signal according to the transfer function H2 and output a second output signal obtained by processing the first output signal;
- and
- an adder configured to add the second output signal to the input digital audio signal X to generate an output digital audio signal Y (where H1=[H(z)−1]/(G−1), H2=G−1 when 0<Gin<1/G, H2=1/Gin−1 when 1/G≦Gin≦1 and H2=0 when 1<Gin).
A method of dynamically adjusting a preset gain G of a parametric equalizer having a transfer function H(z) with the preset gain G as a parameter, the method comprising:
- (a) inputting an input digital audio signal X to a first signal processing unit having a transfer function H1 and processing the input digital audio signal X according to the transfer function H1 to generate an output signal Y1;
- (b) inputting the output signal Y1 to a second signal processing unit having a transfer function H2 of a level Gin of the output signal Y1 and processing the output signal Y1 according to the transfer function H2 to generate an output signal Y2;
- and
- (c) adding the output signal Y2 to the input digital audio signal X to generate an output digital audio signal Y (where H1=[H(z)−1]/(G−1), H2=G−1 when 0<Gin<1/G, H2=1/Gin−1 when 1/G≦Gin≦1 and H2=0 when 1<Gin).
A parametric equalizer system having a transfer function H(z) with a preset gain G as a parameter, the parametric equalizer dynamically adjusting the preset gain G, the parametric equalizer comprising:
- a first signal processing unit configured to process a signal X1 according to the transfer function H1 to generate an output signal Y1;
- a level detector configured to detect a level Gin of the output signal Y1;
- a second signal processing unit configured to process the output signal Y1 according to the transfer function H2 of the level Gin detected by the level detector to generate an output signal Y2;
- and
- an adder configured to add the output signal Y2 to the signal X1 to generate an output digital audio signal Y (where H1=[H(z)−1]/(G−1), H2=G−1 when 0<Gin<1/G, H2=1/Gin−1 when 1/G≦Gin≦1 and H2=0 when 1<Gin).
A method of dynamically adjusting a preset gain G of a parametric equalizer having a transfer function H(z) with the preset gain G as a parameter, the method comprising:
- (a) inputting a signal X1 to a first signal processing unit having a transfer function H1 and processing the signal X1 according to the transfer function H1 to generate an output signal Y1;
- (b) detecting a level Gin of the output signal Y1;
- (c) inputting the output signal Y1 to a second signal processing unit having a transfer function H2 of the level Gin detected in the step (b) and processing the output signal Y1 according to the transfer function H2 to generate an output signal Y2;
- and
- (d) adding the output signal Y2 to the signal X1 to generate an output digital audio signal Y (where H1=[H(z)−1]/(G−1), H2=G−1 when 0<Gin<1/G, H2=1/Gin−1 when 1/G≦Gin≦1 and H2=0 when 1<Gin).
Dependencies are inferred from the claim text.