I'm on board.
Involve CD4....Is there any life in it????
- Thread starter chucky3042
- Start date
Help Support QuadraphonicQuad:
BigAlt
Member
I'm still in for one. I now have 2 SMs ( one an original without SQ and an SQ edition which was also an original SM I sent back to Chucky for the SQ chip upgrade ).
BigAlT
BigAlT
I'm still in or count me in if my name never made it to the original list.
Thank you Chucky for keeping this concept alive.
Thank you Chucky for keeping this concept alive.
surround.sound.enthusiast
500 Club - QQ All-Star
Hi Chucky,
I'm still in for a CD-4 demodulator too.
I'm still in for a CD-4 demodulator too.
During the develope of Lou Dorrens Demodulator around 150 interested Fans has voted to buy one - so far I know. Today it should be possible to collect 100 prospective buyers. But by further longer waiting, less number os interestred Fans are known.
I would buy also a new CD-4 Demodulator, which works by real CD-4 technic.
I would buy also a new CD-4 Demodulator, which works by real CD-4 technic.
segacd
Member
I'm in!
- Joined
- Jan 19, 2006
- Messages
- 221
Count me in.
Still hopeful (and in.)
I'm in :upthumb
Missed you fredy....
Last edited:
vinylguy4
701 Club - QQ All-Star
I posted earlier in this thread and still in for the CD-4 unit if it is near $500.
vinylguy4
vinylguy4
Still in.
Put me down as still in!
- Joined
- Apr 9, 2012
- Messages
- 2,704
Hi All
Thanks for this, gives me some confidence to get Overture off his Lazy arse!
Regards
Chucky
Thanks for this, gives me some confidence to get Overture off his Lazy arse!
Regards
Chucky
rolvkarsten
Well-known Member
Chucky, have you been thinking around the analogue filters? What order and type, and 3dB freqency? The sharp filters brings us into the same problems as the first CD players, brickwall filters with horrible phase response. That is a reason for DSP, as Philips did in the 80ties with their digital oversampling filters.
On the other hand, the old analogue CD-4 records are probably recorded via similar horrible analogue filters
Regds
/RK
Hope this works out, be a nice tribute to Lou Dorren. I was on his dmod list a few years back.
Regarding LP and BP filters for CD-4 playback:
Why bother with the LP filter for the baseband/sum signals?
Just let the RIAA playback EQ reduce the amplitude of the
20kHz to 45kHz FM carrier (this is exactly what happens when a
CD-4 record in played in Stereo, after the RIAA EQ, the carrier
amplitude is reduced and doesn't damage tweeters).
There are several AES documents that describe the CD-4 system
and could be helpful in determining the BP filter requirements.
Kirk Bayne
Why bother with the LP filter for the baseband/sum signals?
Just let the RIAA playback EQ reduce the amplitude of the
20kHz to 45kHz FM carrier (this is exactly what happens when a
CD-4 record in played in Stereo, after the RIAA EQ, the carrier
amplitude is reduced and doesn't damage tweeters).
There are several AES documents that describe the CD-4 system
and could be helpful in determining the BP filter requirements.
Kirk Bayne
I'm still in for one.
- Joined
- Jan 19, 2006
- Messages
- 221
I would like to reiterate my desire for one of the Involve CD-4 units. I love my SQ Surround Master and I love the fact that these crazy guys are even considering making a CD-4 box for us.
I know I said I was in just a few posts back but I'm concerned that this effort is getting lost in some thread shuffling around here.
If the Involve threads aren't going to all be in the same place, can this one at least get a sticky? Obviously Lou Dorren's thing doesn't need the stickies anymore.
I know I said I was in just a few posts back but I'm concerned that this effort is getting lost in some thread shuffling around here.
If the Involve threads aren't going to all be in the same place, can this one at least get a sticky? Obviously Lou Dorren's thing doesn't need the stickies anymore.
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