Adaptive signal weighting system
AssigneeMicronas GmbH
InventorsMatthias Vierthaler, Carsten Noeske
Life of this patent
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Abstract
A system for decoding an electrical input signal includes a filter that impresses a variable gain on a portion of the input signal to deemphasize a spectral region of the input signal. The variable gain is set as a function of a variable gain control signal. A frequency detector generates the variable gain control signal in accordance with a frequency value wherein approximately one-half of the energy of the input signal is below the frequency value.
Claims19
An adaptive signal weighting system including a signal path for transmitting an information signal of a predetermined bandwidth through said system, said system further comprising:
- a filter that applies a first variable gain factor to said information signal within a first select spectral region of said predetermined bandwidth to provide a filtered signal, said first variable gain factor varying as a function of a first control signal;
- means, responsive to said information signal, for generating said first control signal in accordance with a frequency value wherein a predetermined portion of the energy of said information signal is below said frequency value;
- gain control means responsive to said filtered signal for varying signal gain impressed on said filtered signal substantially throughout said predetermined bandwidth by a second variable gain factor to provide an output signal, said second variable gain factor varying as a function of a second control signal;
- and
- means for generating said second control signal in response to and as a function of signal energy of said information signal substantially within a second select spectral region within said predetermined bandwidth.
An adaptive signal weighting system including a signal path for transmitting an information signal of a predetermined bandwidth through said system, said system comprising:
- a filter for applying a first variable gain factor to said information signal within a first select spectral region within said predetermined bandwidth to provide a filtered signal, said first variable gain factor varying as a function of a first control signal;
- a frequency detection circuit that determines a frequency value wherein a selected percentage portion of the energy of said information signal is below said frequency value, and generates said first control signal in response to and in accordance with said frequency value wherein the selected percentage portion of the energy of said information signal is below said frequency value;
- a gain circuit that receives said filter means for varying signal gain impressed on said information signal substantially throughout said predetermined bandwidth by a second variable gain factor to provide an output signal, said second variable gain factor varying as a function of a second control signal;
- and
- means for generating said second control signal in response to and as a function of signal energy of said information signal substantially within a second select spectral region within said predetermined bandwidth.
A system for decoding an encoded information signal of a predetermined bandwidth previously encoded so that said encoded information signal can be recorded on or transmitted through a dynamically-limited, frequency dependent channel having a dynamically-limited narrower portion in a first spectral region than in at least one other spectral region of said predetermined bandwidth, said system comprising:
- input means for receiving said encoded information signal in its encoded form;
- a signal transmission path coupled to said input means and responsive to said encoded information signal;
- output means coupled to said signal transmission path for providing a decoded information signal;
- gain control means disposed in said signal transmission path for varying a first signal gain impressed on said encoded information signal substantially throughout said predetermined bandwidth to provide a gain compensated signal, said first signal gain varying as a function of a first control signal;
- a filter that generates a filtered information signal and that is disposed in said signal transmission path and coupled to said gain control means for impressing a second variable gain on a portion of said gain compensated signal substantially within said first spectral region so as to deemphasize said portion with respect to a remaining portion of said gain controlled information signal, said second variable gain varying as a function of a second control signal;
- means for generating said first control signal in response to and as a function of signal energy within a second spectral region of said filtered information signal;
- and
- means for generating said second control signal in accordance with a frequency value wherein a selected percentage of the energy of said filtered information signal is below said frequency value.
Dependencies are inferred from the claim text.