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| Acoustic apparatus |
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| Amplifier arrangement for use as a line driver |
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Audio signal processing apparatus
| Details |
Inventors: Driscoll, Norman Joseph;
Assignee: Yudin Industries, Inc. (Murray Hill, NJ)
Primary Examiner: Olms; Douglas W.
Assistant Examiner:
Attorney, Agent or Firm: Hopgood, Calimafde, Kalil, Blaustein & Lieberman
Improved audio reproduction apparatus permits upgrading a two channel high fidelity ("stereo") system to four channel ("quadraphonic") capability, while flexibly accommodating varying four channel source signal formats, e.g., four channel discrete, or encoded two channel SQ (e.g., tape, FM) or CD-4 (phonograph). The composite arrangement includes demodulation circuitry for the variously formated incoming signals, and plural variable gain amplifier arrays for final signal source selection which is readily effected by off-board minimal, DC switching. |
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DETAILED DESCRIPTION What is claimed is: 1.
In combination, four conducting means, source and selector means for selectively supplying four channel discrete quadraphonic audio program signals to said four conducting means and for supplying four channel encoded signal information to a subset of said four conducting means, a first array of switched amplifiers each having input terminals connected to a different one of said four conducting means, demodulator means including decoding means for producing four channel signals from two input signals having inputs connected to said subset of said four conducting means, a second array of switched amplifiers each receiving a different one of said four demodulated four channel signals from said demodulator means, plural linear junction means each connected to the outputs of a different pair of switched amplifiers in said first and second amplifier arrays, and discrete-demodulated four channel program selection means including means for enabling one of said amplifier arrays and means for disabling the other of said amplifier arrays.
2.
A combination as in claim 1, wherein said four discrete quadraphonic audio program signal supplying source means comprises four channel encoded demodulating means including low pass filter sum signal passing means, FM subcarrier difference signal demodulating means, and matrix means for matrixing the outputs of said low pass filter means and said FM subcarrier demodulating means.
3.
A combination as in claim 2 wherein said four discrete quadraphonic program signal supplying source means further comprises an input port for receiving such signals, and selector switch means having outputs switchably connectable to said four discrete signal receiving input port and to the outputs of said matrix means of said four channel encoded signal demodulating means.
4.
A combination as in claim 1 wherein said first and second switched amplifier arrays each include a plurality of amplifiers each having a voltage control port, and wherein said discrete encoded amplifier array selection means comprises means for supplying an amplifier enabling potential to said voltage control port of all the amplifiers of one of said amplifier arrays and for supplying an amplifier disabling signal to said voltage control port of all of the amplifiers of the other of said amplifier arrays
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