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Abstract

A frequency discriminate leveler ('FDL') which controls its attack rate depending on the audio frequency to more perfectly preserve the natural sound of the audio program while very effectively controlling the long term average program level. The FDL has a function to attack more slowly for low frequency signals than for high frequency signals. The FDL includes a gain controller, an FDL control generator and a leveling detector. The gain controller coupled to an input signal and an output signal. The input signal is the unleveled audio program which can vary widely in average level. The output signal is the leveled signal which contains a more constant average level. The FDL control generator generates a suitable control output to cause the gain controller to increase or decrease gain. The FDL control generator is coupled to the leveling detector for the purpose of receiving the output of the leveling detector, and generating a control output to control the gain of the gain controller. The leveling detector receives a sample input and generates a detected output signal coupled to the input of the FDL control generator.

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First Claim