(1972-02) Kenwood KA-8044 "Quadrix" Home Matrix Encoder

[kfbkfb]

https://worldradiohistory.com/Archi...idelity/70s/High-Fidelity-1972-02.pdf#page=32^^^
In addition it will encode quadraphonic sources so that they can be recorded on con-
ventional stereo recorders and played back quadraphonically through the Quadrix circuitry.


Anyone know the specific encoding (and decoding) equations used in this home matrix encoder?


Kirk Bayne

 

[fizzywiggs41]

That's a most unusual device.

Encoding Quadrix? , likely some type of Regular Matrix.

 

[kfbkfb]

I remember reading (probably this announcement in HF) about this Kenwood device, at the price, it's probably similar to the Electro-Voice Stereo-4 matrix system (which uses phase reversals rather than 90 degree phase shifts).

I did a quick Google search and found the owners manual in German or for a small $ charge, the schematic is probably available too (which would of course solve the encode/decode equations issue).


Kirk Bayne

 

[Dolbytone]

.

 

[kfbkfb]

Looks like Kenwood wanted to keep their encode/decode system top secret - the (X15-1000-11), I'll stick with my earlier post that Quadrix is similar to the Scheiber/DynaQuad/Stereo-4 phase reversal type of matrix.

(just have to get a KA-8044, connect test signals to LF,RF,LB,RB and see what appears in encoded L,R)


Kirk Bayne