Peak detector
AssigneeU.S. Philips Corporation
InventorWilliam Redman-White
Life of this patent
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Abstract
A peak detector comprises a device for storing a value representing the currently detected peak amplitude (Cp,Cn), a circuit for detecting whether the input signal amplitude exceeds the stored value (D1 to D4), an apparatus for updating the stored value at a fast rate if the input signal amplitude exceeds the stored value by more than a given value (D1/V1, D3/V4), and an apparatus for updating the stored value at a slow rate if the input signal amplitude exceeds the stored value by less than the given value (D2/R2, D3/R3). Analogue and digital versions are described together with their application to data slicers in, for example, teletext decoders.
Claims21
A peak detector for detecting the peak amplitude of an input signal, the peak detector comprising:
- storage means for storing a value representing a currently detected peak amplitude, means for detecting whether the input signal amplitude exceeds the stored value, means coupled to the storage means for updating the stored value at a first rate if the input signal amplitude exceeds the stored value by more than a given value, and the means for updating updates the stored value at a second slower rate if the input signal amplitude exceeds the stored value by less than the given value.
Dependencies are inferred from the claim text.