Adaptive signal weighting system

An adaptive signal weighting system including a signal path for transmitting an electrical information signal of a predetermined bandwidth through said system, said system further comprising:

• filter means disposed in said signal path for varying the gain impressed on the portion of said information signal within a first select spectral region within said predetermined bandwidth by a first variable gain factor, said first variable gain factor varying in response to and as a function of a first control signal;
• means for generating said first control signal in response to and in accordance with the absolute value of the signal energy of said information signal within a second select spectral region within said predetermined bandwidth including at least a part of said first select spectral region;
• gain control means disposed in said signal path and coupled to said filter means for varying the signal gain impressed on said information signal substantially throughout said predetermined bandwidth by a second variable gain factor, said second variable gain factor varying in response to and as a function of a second control signal;
• and
• means for generating said second control signal in response to and as a function of the signal energy of said information signal substantially within a third select spectral region within said predetermined bandwidth.

A system for encoding an electrical information signal of a predetermined bandwidth so that said information signal can be recorded on or transmitted through a dynamically-limited, frequency dependent channel having a narrower dynamically-limited 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 information signal;
• a signal transmission path coupled to said input means for transmitting said information signal received at said input means;
• output means coupled to said input means through said signal transmission path for providing said information signal as encoded by said system;
• gain control means coupled to said signal path for varying the signal gain impressed on said information signal substantially throughout said predetermined bandwidth, said signal gain varying in response to and as a function of a first control signal;
• filter means coupled to said signal path and said gain control means for impressing a second variable gain on the portion of said information signal substantially within said first spectral region so as to preemphasize said portion with respect to the remaining portions of said information signal, said second variable gain varying in response to and as a function of a second control signal;
• means for generating said first control signal in response to and as a function of the signal energy of said information signal substantially within a second spectral region of said predetermined bandwidth;
• and
• means for generating said second control signal only in response to and in accordance with the signal energy of said information signal within a third spectral region of said predetermined bandwidth including at least a part of said first spectral region.

A system for encoding an electrical information signal of a predetermined bandwidth so that said encoded signal can be recorded on or transmitted through a dynamically-limited, frequency dependent channel having a narrower dynamically-limited portion in one spectral region than in at least one other spectral region, said system comprising:

• input means for receiving said information signal;
• output means coupled to said input means through a signal transmission path for providing said encoded signal;
• gain control means disposed in said signal path for varying the signal gain impressed on said information signal substantially throughout said predetermined bandwidth, said signal gain varying in response to and as a function of a first control signal;
• coupled to said
• filter means disposed in said signal path and gain control means for impressing a second variable gain on the portion of said information signal substantially within said one spectral region so as to preemphasize said portion with respect to the remaining portions of said information signal, said second variable gain varying in response to and as a function of a second control signal;
• means for generating said first control signal in response to and as a function of the signal energy of said encoded signal substantially within a second spectral region;
• and
• means for generating said second control signal in response to and in accordance with the absolute value of the signal energy of said encoded signal within a third spectral region of said predetermined bandwidth including at least a part of said one spectral region.

A system for decoding an electrical information signal of a predetermined bandwidth previously encoded so that said 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 information signal in its encoded form;
• a signal transmission path coupled to said input means for transmitting said information signal;
• output means coupled to said signal transmission path for providing said information signal in decoded form;
• gain control means disposed in said signal path for varying the signal gain impressed on said information signal substantially throughout said predetermined bandwidth, said signal gain varying in response to and as a function of a first control signal;
• filter means disposed in said signal path and coupled to said gain control means for impressing a second variable gain on the portion of said information signal substantially within said first spectral region so as to deemphasize said portion with respect to the remaining portions of said information signal, said second variable gain varying in response to and as a function of a second control signal;
• means for generating said first control signal in response to and as a function of the signal energy of said information signal within a second spectral region of said information signal;
• and
• means for generating said second control signal only in response to and in accordance with the signal energy of said information signal substantially within a third spectral region of said predetermined bandwidth including at least a part of said first spectral region.

A system for decoding an electrical information signal of a predetermined bandwidth previously encoded so that said information signal can be recorded on or transmitted through a dynamically-limited, frequency dependent channel having a dynamically-limited narrower portion in one spectral region than in at least one other spectral region, said system comprising:

• input means for receiving said previously encoded information signal;
• output means coupled to said input means through a signal transmission path for providing said information signal in decoded form;
• gain control means disposed in said signal path for varying the signal gain impressed on said encoded information signal substantially throughout said predetermined bandwidth, said signal gain varying in response to and as a function of a first control signal;
• filter means disposed in said signal path and coupled to said gain control means for impressing a second variable gain on the portion of said encoded information signal substantially within said one spectral region so as to deemphasize said portion with respect to the remaining portions of said encoded information signal, said second variable gain varying in response to and as a function of a second control signal;
• means for generating said first control signal in response to and as a function of the signal energy of said encoded information signal substantially within a second spectral region of said encoded information signal;
• and
• means for generating said second control signal only in response to and in accordance with the absolute value of the signal energy of said encoded information signal substantially within a third spectral region of said predetermined bandwidth including at least a part of said one other spectral region.