专利名称：Signal re-distribution, decoding and
processing in accordance with amplitude,phase and other characteristics
发明人：Peter Scheiber申请号：US07/100888申请日：19880122公开号：US04891839A公开日：19900102
摘要：Decoding apparatus is disclosed providing desirable multichannel separationamong various signals received in a channel pair and distinguished by relative phase andamplitude, including re- distribution of output vs. input signal nulls or positions on the\"phase- amplitude sphere.\" Disclosed separation enhancement circuits are characterizedby improved economy and signal purity. Enhancement is preferably controlled within thecircuit by combination of gain- controlled enhancement signals with fixed matrix signals insumming amplifiers or the like. In some embodiments the enhancement signal for oneoutput channel is modified to produce a different enhancement signal for a differentoutput channel. In such separation enhancement, alternatives to the preferred-embodiment variable-gain element may include such commercial devices as expander ornoise-reduction chips. Derivation of control voltages for controlling separation
enhancement is characterized by economical sensing of various program characteristicssuch as phase, amplitude and program level changes, and may for example include logratio direction-sensing circuits. Control-voltage processing in response to sensedprogram characteristics provides improved smoothness of operation and freedom from
anomalous operation. In one embodiment, circuits providing a choice between
\"panoramic\" or \"surround\" reproduction and \"ambience\" reproduction of stereo programare disclosed. In another embodiment, optimal miltidirectional separation-enhanceddecoding for cinema or video sound is obtained with the use of a single variable-gainelement.
申请人：SCHEIBER; PETER
代理人：Robert R. Keegan
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