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

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national-kid

Member
Joined
Mar 29, 2012
Messages
35
Location
Tokyo
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

2K Club - QQ Super Nova
Joined
Nov 25, 2008
Messages
6,396
Location
estados hundidos
This all looks like Chinese to me, but ...it's very pretty...

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

DuncanS

2K Club - QQ Super Nova
QQ Supporter
Joined
Aug 30, 2012
Messages
4,751
Location
UK
Really nice unit, and very impressed that you've recreated the logic functions.
 

kap'n krunch

2K Club - QQ Super Nova
Joined
Nov 25, 2008
Messages
6,396
Location
estados hundidos
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

Member
Joined
Mar 29, 2012
Messages
35
Location
Tokyo
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
 

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malcolmlear

Member
Joined
Apr 7, 2008
Messages
48
Location
Colchester UK
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 ))
 

national-kid

Member
Joined
Mar 29, 2012
Messages
35
Location
Tokyo
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

Member
Joined
Apr 7, 2008
Messages
48
Location
Colchester UK
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.
 
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