Block diagrams of Quad (QS/SQ) systems with logic

[national-kid]

In addition, I have modified the decoder of 4ch.
This time, creates a new QS logic decoder board, was added to the second floor.
And, I put a sound source direction indicator on the panel.

http://www.hi-ho.ne.jp/odaka/quad/SQQS1B.pdf

 

[John Svensson]

A labor of love no doubt, and a lot of soldering!

 

[national-kid]

Thank you gotten interested.
Number of parts is only 920 pieces. (number of dual op amp is only 62 pieces.)
Until then, made in the universal board.
But this time, compared with it, without wiring mistakes, production was very easy.

 

[kap'n krunch]

This all looks like Chinese to me, but ...it's very pretty...

So ...what are the output specs? (channel separation, freq response, etc.)?

 

[DuncanS]

Really nice unit, and very impressed that you've recreated the logic functions.

 

[kap'n krunch]

I'll buy one from you...if the specs are right...has to have a freq response of up to 44K at least (+/- 3dB), and at least 30 dB channel separation...phono in is not needed(it would be another module, a preamp)

 

[national-kid]

This all looks like Chinese to me, but ...it's very pretty...

So ...what are the output specs? (channel separation, freq response, etc.)?

Separation is not very good. However, there was no practical problem.
Direction discrimination and responsiveness is also very important.

 

[national-kid]

Please disregard the above data.
Place the measurement data that has been modified in the following.

Frequecy Responce & Channel Separation

Page 1
Homebrew QS Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight
Homebrew SQ Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight

Page 2
Homebrew 3 Band SQ Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight
QSD-1 3 Band QS Vario Matrix decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight

Page 3
QSD-2 QS Vario Matrix decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight
QSD-1000 QS Vario Matrix decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight

Page 4
SQA-2030 SQ W/M Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight
SQD-2050 SQ F/B Logic decoder
FrontRight/FrontLeft FrontCenter/BackCenter
FrontRight/BackLeft FrontRight/BackRight

 

[simgrant]

I know this is an old thread but would you ever make the PCB available with a short instruction on how to make the adjustments?

 

[malcolmlear]

That's actually quite good separation and clearly correct decoding (minimum 15db). I've looked at the schematics and cannot understand OD's comment, it all looks very good ))

 

[chucky3042]

Hey gang

Guess who's got the original Sansui chips??

Regards

Chucky

 

[Soundfield]

Hey gang

Guess who's got the original Sansui chips??

That's just being greedy!

 

[chucky3042]

Greed is good!

 

[national-kid]

Added some measurement data of equipment.
　http://www.hi-ho.ne.jp/odaka/quad/XT.pdf

Self-Made 1 Band QS/SQ Decoder Crosstalk Characteristics
　SQ/QS processes the audio band by not dividing it.

Self-Made 3 Band QS/SQ Decoder Crosstalk Characteristics
　QS processes the audio band by dividing it into four.
　　But, no processing of direction emphasis logic is performed in the lowest band.

Surround Master　QS/SQ Decoder Crosstalk Characteristics
Surround Master V2 QS/SQ Decoder Crosstalk Characteristics
　Seems difference in characteristics depends on input level.

Sunsui QSD-1/QSD-1000 Crosstalk Characteristics
Sunsui QSD-2 QS/SQ Crosstalk Characteristics

Sony SQA-2030 / SQD-2050 Crosstalk Characteristics
　In W/M logic, in an actual music sound source, floating of sound image is remarkable.

Without Logic QS / SQ Decoder Characteristics

QS Decoder Crosstalk Characteristics included with Suzanne Ciani vinyl
　Same as Surround Master.

 

[malcolmlear]

Wonderful stuff! I'll try and format the shadow vector decode results for comparison.
Would also be useful if the latest audition script could be analyzed.

 

[national-kid]

　

 

[national-kid]

　

 

[national-kid]