Stereophonic bilingual signal processor
First Claim
1. Apparatus for processing first and second audio input signals of either a matrixed stereophonic form wherein each signal comprises first and second common components or of an unmatrixed form wherein each signal comprises a respective independent component, said apparatus comprising:
- first means for linearly combining said audio input signals in predetermined proportions to provide a resultant audio signal exhibiting a null condition when said input signals are of said matrixed form and a non-null condition when said input signals are of said unmatrixed form; and
second means for detecting said null and non-null conditions of said resultant audio signal and providing an indicator signal having a first condition indicative of said matrixed form of said input signals and a secod condition indicative of said unmatrixed form of said input signals.
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Abstract
The format of two audio input signals, which may be of either matrixed form wherein each signal comprises two common components or of unmatrixed form wherein each signal comprises a respective independent component, is determined by applying the signals to a first network circuit which linearly combines the signals to produce a resultant audio output signal exhibiting a null condition when the input signals are of matrixed form and a non-null condition when the input signals are of unmatrixed form. A null detector responsive to the resultant signal supplies a control signal to a second decoder matrix which decodes the matrixed signals to independent form and couples the decoded signals to respective first and second output terminals when the null condition is detected and which couples the unmatrixed input signals to respective ones of the first and second output terminals when the non-null condition is detected.
55 Citations
10 Claims
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1. Apparatus for processing first and second audio input signals of either a matrixed stereophonic form wherein each signal comprises first and second common components or of an unmatrixed form wherein each signal comprises a respective independent component, said apparatus comprising:
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first means for linearly combining said audio input signals in predetermined proportions to provide a resultant audio signal exhibiting a null condition when said input signals are of said matrixed form and a non-null condition when said input signals are of said unmatrixed form; and second means for detecting said null and non-null conditions of said resultant audio signal and providing an indicator signal having a first condition indicative of said matrixed form of said input signals and a secod condition indicative of said unmatrixed form of said input signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. Apparatus for identifying the form of first and second audio input signals which may be either of a matrixed stereophonic form wherein each signal comprises first and second common components or of an unmatrixed form wherein each signal comprises a respective independent component, said apparatus comprising:
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first means for combining said first and second signals to produce a third audio signal; second means for combining said first and third audio signals to produce a fourth audio signal; third means for combining said second and third audio signals to produce a fifth audio signal; fourth means for combining said fourth and fifth audio signals to produce a resultant audio signal exhibiting a null condition when said first and second audio input signals are of said matrixed form and a non-null condition when said first and second audio input signals are of said unmatrixed form; and fifth means for detecting said null and non-null conditions of said resultant audio signal and providing an indicator signal having a first condition indicative of said matrixed form of said input signals and a second condition indicative of said unmatrixed form of said input signals.
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Specification