QS SQ quad full logic and sphere surround circuit
I want to understand the claim of an artist and the creator by revitalizing a original sound (in Hi-Fi) as much as possible.@
Past step
1970. I produce the QS decoder which I copied to phase modulation in reference to QS-1.@Unfortunately, phase modulation (rear does not sound localization) of QS-1 had a slightly unreasonable. Because the phase disposal of backward channels is incomplete, QS-D1000 has some influences on forward normal position.
@1989. My own professional logic Dolby decoder and the circuit.@However, the rear is monaural and Dolby is not suitable for music reproduction for specifications without the continuity of front and rear too much.
@2003. Therefore it is QS/SQ4ch decoder, the inside and the circuit to have remade. From the left an input selector (the back, decoder, three system outside 4ch input). A sound field turn. SQ/QS choice. A matrix coefficient. A previous level. Back level. A result of the audition, QS has become practical, however, SQ did not become entirely practical without separation.
2004. And it is the front of the new QS4ch/SQ4ch decoder which it remade, the backside, the inside, the connection diagram in what wanted to let you have an equalizer and the video selector built-in newly. iBy lack of the point of contact number of switches, the change of QS/SQ detects an axial turn and changes it through a relayj@However, the initial version that did not use op-amp for sound quality was much better. It is a video input selector, an audio system input selector, a matrix coefficient from the left. A sound field turn. A Quad input selector (four system outside 4ch input, QS, SQ), a mode change, a previous level. Back level. Here, SQ without logic, it was found that even with increased precision, useless. Therefore, it was started the development of logic SQ.
@2007. QS4ch, SQ4ch and QS6ch which the top and bottom considered, a decoder with logics. The front, the inside, the connection diagram. From the left video input selector, stereo mode, audio system input selector, 2ch mode, decode mode, tape monitor, bypass, Quad input selector (4 system outside 4ch input, QS, SQ), sound field turn, Quad mode, SQ mixture, logic ON/OFF, Front level, upper level, Rear level, lower level.) The details. Thus, the validity of the design logic of the QS4ch and SQ4ch could be confirmed. In addition, by logic, to withstand practical use was also found SQ4ch.
@2011. Since 6ch was over-specs, it remade, QS/SQ4ch logic decoder. The front, the backside, the inside, the block diagram, the connection diagram. From the left audio system input selector, stereo mode, Quad input selector (4 system outside 4ch input, QS, SQ), 2ch mode, tape monitor, SQ mixture, logic ON/OFF, Quad mode, F/R mode, Front level, Rear level.) Although no less than 60 pieces are using the dual operational amplifier, sound quality degradation is slight (if compared with sound quality degradation at the time of the A/D conversion of the digital sound source itself). However, the logic of QS6ch was needed re-examination. (Because there was a flaw in the logic processing of discontinuous space)
@2012. For comparison with the Sansui QSD-1, also with it, has produced a SQ4ch decoder the audio band is divided into three, put the logic for each. In addition, the QS4ch system was not a problem for practical use even if there is no logic. Therefore, the QS4ch system is not put the logic. Front, behind, inside, the block diagram, the connection diagram. From left to right, decode mode, input selector, Quad mode, Front level, Rear level. Using a dual op-amp 81 pieces. Compared with the SQ4ch decoder was manufactured in 2011, improvement of sound localization has been achieved. (For reference, the SQ4ch logic decoder circuit diagram (in design) that do not split the bandwidth..)
Supplement
The
QS4ch/SQ4ch/QS6ch encoder that I produced as a machinery for adjustment, the front, the inside., the connection diagram. i6
channel main amp and the connection diagram
which are connected to this decoder for your informationj
Test
signal (noise). 10 seconds recording QS4ch signal : QS.zip
(3.7MB) and SQ4ch signal : SQ.zip (3.7MB), Rotate 2
second intervals : RT.zip (8.3MB).
The commentary of various matrix methods
@QS4ch method, an SQ4ch method, a QS6ch method, each encode / decode expression are as follows.
@EThe
encoding / decode calculating formula of the QS4ch method
L = 0.92*LF + 0.38*RF + 0.92*LR*i + 0.38*RR*i
R = 0.38*LF + 0.92*RF - 0.38*LR*i - 0.92*RR*i
LF
= L + 0.414*R
RF
= R + 0.414*L
LR
= -L*i + 0.414*R*i
RR = R*i - 0.414*L*i
@EThe encode
/ decode calculating formula of the SQ4ch method
L = LF - 0.707*LR*i + 0.707*RR
R = RF - 0.707*LR
+ 0.707*RR*i
LF
= L
RF
= R
LR
= 0.707*L*i - 0.707*R
RR = 0.707*L - 0.707*R*i
Symmetric improvement method
LF =
L
RF =
R
LR = -0.5*L*(1-i) - 0.5*R*(1+i)
RR = 0.5*L*(1+i) + 0.5*R*(1-i)
@EThe encode / decode calculating formula of QS6ch methods
L = 0.92*LF + 0.38*RF + 0.92*LR*i + 0.38*RR*i +
0.65*(1+i)*UP + 0.65*(1-i)*DN
R = 0.38*LF + 0.92*RF - 0.38*LR*i - 0.92*RR*i + 0.65*(1-i)*UP +
0.65*(1+i)*DN
LF
= L + 0.414*R
RF
= R + 0.414*L
LR
= -L*i + 0.414*R*i
RR
= R*i - 0.414*L*i
UP
= -0.707*L*i + 0.707*R
DN
= 0.707*L - 0.707*R*i
Symmetric improvement method
LF =
L + 0.414*R
RF =
R + 0.414*L
LR = -L*i + 0.414*R*i
RR =
R*i - 0.414*L*i
UP =
0.5*L*(1-i) + 0.5*R*(1+i)
DN = 0.5*L*(1+i) + 0.5*R*(1-i)
Introduction of the effective software
@EQS4ch/QS6ch method
@Archie Shepp(ATTICA BLUES), Mehta(PLANETS), Alice Coltrane(World Galaxy), Dan Hicks(STRIKING IT RICH), Gateau Barbieri(LATINO AMERICA), SUN RA(SPACE IS THE SPACE), works of black jazz, works of mobile fidelity, etc
@ESQ4ch
method
@Miles Davis(BITCHES BREW), Pink Floyd(Works), Chase(Chase), works of Santana, Chicago(1-10), works of Earth wind & fire, Polnareff(Polnareff's), works of Herbie Hancock, works of Weather Report, works of Jeff Beck, Isley Bros(3+3), Bernstein(PLANETS), works of CTI, etc,
Others
list of software during the evaluation.
Supplement
I obtained the SQ4ch decoder of wave matching logic method made by Sony. I compared it with my own decoder. The sound source by the side of small volume was dragged completely in by the side of big volume. Therefore, it is expected that it would be logic to reduce the volume of the channel of small volume.
