H - Electricity – 04 – S
Patent
H - Electricity
04
S
179/8
H04S 1/00 (2006.01) H04S 5/00 (2006.01)
Patent
CA 1299111
STEREO SYNTHESIZER ABSTRACT OF THE DISCLOSURE A stereo image enhancement system, in which dif- ference signal components in relatively quieter difference signal frequency bands are boosted to provide an improved stereo image, is provided with a stereo input that is syn- thetically derived from a monaural signal (L + R). Simu- lated sum (L + R)s and simulated difference (L - R)s sig- nals are provided from a monaural input (L + R) by sending the input through a phase shifter and splitter (12) that provides 0° and 90° outputs with a constant 90° phase separation between the two at all audio frequencies. The leading one of the two output signals from the phase shifter is employed as a simulated sum signal, and the other as a simulated difference signal. The simulated difference signal has different frequency components, each delayed by different amounts relative to corresponding components of like frequency of the simulated sum signal. This provides an effective synthetic difference signal, with both sum and difference signals being suitably fil- tered to provide an improved pair of synthetically derived stereo sum and difference signals (L + R)s, (L - R)s as inputs to an image enhancement circuit.
592019
Sim & Mcburney
Srs Labs Inc.
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