Apple IIGS booting System 5.04 and running Claris Appleworks GS spreadsheet. This is captured via the NTSC composite video output of the IIGS. The video quality on the RGB monitor is much better.
I think we need a cash-for-clunkers program in Cape Town. There are many old stuffed cars like these. I try to drive a cleaner car (Prius) and then these cars undo all that.
like my car? but ... By: idkyoo. on 12 Dec 11, 12:43:34 like my car? but mines 3x worse... xD
haha yeah? By: albertusj. on 02 Oct 11, 12:21:50 haha yeah?
Hey, you're ... By: cr1901. on 25 Sep 11, 18:06:40 Hey, you're driving? on the wrong side of the road, just like you use the wrong mains voltage AC :P!
When the sync ... By: albertusj. on 05 Jul 11, 18:41:25 When the sync pulses are missing, the electron beam in the TV has no information on where to? start drawing the image, so it looks all messed up. Filtering would not help, the sync pulses need to be replaced by some form of gating/switching arangement.
I was supposed to ... By: cr1901. on 05 Jul 11, 13:59:52 I was supposed to take Image Processing this fall, so I'd have a much-better-than-just-general conceptual grasp on why phase matters in video (after having to take DSP), but alas the professor for the course? took a new position :(. Couldn't you get at least the image back by designing an analog (or digital, if it's practical) all pass filter which correct the phase?
The image wriggles ... By: albertusj. on 10 Feb 11, 04:53:43 The image wriggles like? that because the sync pulses are missing. It is possible to put the syncs back, but the audio is digital and encrypted. The audio is nearly impossible to "hack". I won't waste my time.
Is the video? ... By: cr1901. on 10 Feb 11, 04:13:04 Is the video? signal out of phase deliberately so you can't get it without paying a fee?
I know, but what ... By: albertusj. on 30 Apr 12, 06:56:58 I know, but what you're hearing is actually a buffer? management issue.Thanks for visiting.
you need some error ... By: physicmad. on 29 Apr 12, 10:30:05 you need some error correction in that stream mate? - i can hear the audio slightly garble in occasions from the loss on the tape. - but the fast forward sounds awesome haha - i do sugest you need some code to handle bad CRC or unfilled buffers just to blank out the unwanted audio
please? give your ... By: 29riteshkakkar. on 18 Apr 11, 13:44:05 please? give your id....
Hi, please give ... By: 29riteshkakkar. on 18 Apr 11, 13:43:46 Hi, please give your mail add......?
Hi, please? give ... By: 29riteshkakkar. on 18 Apr 11, 13:43:32 Hi, please? give your mail add.
Thank you. I wish I ... By: albertusj. on 30 Mar 11, 09:05:28 Thank you. I wish I had more time to advance the project. Day? job....
Yeah it'll be a ... By: albertusj. on 30 Mar 11, 09:04:59 Yeah it'll be a very cryptic business to anyone who sees it unless they've? worked in the audio recording industry and have seen U-Matic or Beta PCM tapes
Nice? work,........ ... By: 29riteshkakkar. on 30 Mar 11, 08:13:48 Nice? work,....................!!
Actually the Sony ... By: albertusj. on 09 Jan 11, 17:05:36 Actually the Sony PCM-1 could do this in 1977 already albeit with? a LOT more discrete electronics. I just wanted to see if it could be done in software on a dsPIC.
Really nice. since ... By: mast3rbug. on 09 Jan 11, 13:00:14 Really nice. since 1990 I know that this was possible. ? Now I have the proof of that.
Hehe very EEEEVIL? By: albertusj. on 25 Oct 10, 15:41:50 Hehe very EEEEVIL?
You can make secret ... By: bumtownv2. on 25 Oct 10, 15:22:16 You can make secret audio message tapes with this thing and? send them to people.
PCM-X1 experimental PCM processor output. Played back from VHS tape. Audio is linear mono track from VHS tape. Shows encoder output only. Decoder not implemented. Audio track used for education/demonstrat ion purposes only. No Copyright violation intended.
http://www.mypriu s.co.za/pcmx1_proces sor.htm
That'll be cool.? ... By: albertusj. on 14 Nov 11, 09:59:03 That'll be cool.? Thanks
I own 2 Sony PCM " ... By: hormelinc. on 14 Nov 11, 09:34:58 I own 2 Sony PCM "modulators". I could put up a PCM test? on my page if needed.
Or by repeated ... By: RoboticusMusic. on 04 Oct 11, 15:14:40 Or by repeated recording degradation to create a? unique sound effect.
yes, I believe ... By: albertusj. on 04 Oct 11, 04:52:25 yes, I believe that? would be possible
Could you ... By: RoboticusMusic. on 04 Oct 11, 00:44:57 Could you manipulate the image and turn that? back into sound?
11 months later, I ... By: cr1901. on 06 Aug 11, 05:18:07 11 months later, I have gotten off my lazy ass to actually implement the? logic gates lmao! Video should follow in: Another 11 months at this rate lol (Seriously, it's been a bad year).
Not right? now. ... By: albertusj. on 16 Jun 11, 12:43:20 Not right? now. Making it compatible is entirely possible and would require only changes to the software. I used my own data format because I didn't have access to the details of the Sony format. I do now after digging in some patent documents. I would love to get a tape encoded in Sony EIAJ 14-bit format to work on.
Is this compatible ... By: wado1942. on 15 Jun 11, 19:42:13 Is this compatible with the Sony's? PCM/video encoding?
Sure, anything is ... By: albertusj. on 25 Apr 11, 06:59:45 Sure, anything is possible. The? PCM output of a CD player could be modulated onto a carrier using something like QPSK.
Is there a? way to ... By: gccengineering1996. on 23 Apr 11, 16:32:10 Is there a? way to send a raw PCM signal to the audio input of the FM transmitter and then decode it using a tuner - PCM decoder - audio amplifer? Is that possible?
Oh yes. Absolutely. ... By: albertusj. on 05 Apr 11, 06:49:35 Oh yes. Absolutely. It was more a learning/academic exercise. Learning doesn't have to produce something useful. Thanks for? visiting.
Cool but zero real ... By: tonysofla. on 04 Apr 11, 21:00:30 Cool but zero real life usefulness.
You can not find vhs player of tapes anymore.
A 16GB SD-card can be had for $18 and can probably replace 10 of your? digital audio vhs tapes.
In the next few ... By: cr1901. on 03 Sep 10, 03:53:17 In the next few days, I should be uploading a video documenting an experimental (read: effectively useless for building complex sequential circuits) system of BJT logic gates I designed... the NOT gate works... the OR gate is untested, but promising, and now I have to do the AND? gate.
If you refer to the ... By: albertusj. on 26 Aug 10, 05:20:28 If you refer to the vertical bands that "look" like noise, that's actually data.
To help you understand how digital data can look like noise, look at
Dolby Digital on Wikipedia.
The audio data on the film frame looks like a "noise"? of dancing dots.
Ahhh okay, thank ... By: cr1901. on 26 Aug 10, 04:27:03 Ahhh okay, thank you... I did misunderstand what your processor does. I also? looked around your site to enlighten me :P. In any case, it seems that there are 6 lines of actual data and in between those six lines is noisy output. Is there any (if any) particular reason you designed the encoder to output the digital data between those lines of noise? Or do I continue to misunderstand (Note: let's ignore the fact that PAL encoding doesn't dedicate certain lines to the video stream.)
The encoder turns ... By: albertusj. on 26 Aug 10, 04:22:27 The encoder turns the PCM audio into what looks like a? video signal (with the bits sitting on the video signal as brightness variations). You now have a video signal that a VCR can record as per normal. Since the encoder outputs a video signal you can display it on a TV just like a video.
I'm just curious ( ... By: cr1901. on 26 Aug 10, 04:12:11 I'm just curious (and probably misunderstand something), but how? is the output from the screen coming from the digital encoder. Isn't the digital information already embedded into the VHS tape when you recorded this? Btw, interesting video that enlightens me about analog vs digital.
This is the video signal generated by my PCM-X2 processor. It shows how the left and right channel samples are spaced in the video signal. The PCM-X2 encodes digital audio into a video signal suitable for recording on video tape. This effectively turns ANY video recorder into a DAT drive. http://www.myprius.c o.za/pcmx2_processor 1.htm
Early playback test of digital sound from the helical video tracks of VHS video tape. Decoded using dsPIC33. More details at:
http://www.mypriu s.co.za/pcmx2_proces sor1.htm
I do not? ... By: albertusj. on 25 May 12, 17:36:30 I do not? understand your question.
Can? I try making a ... By: jjovereats. on 25 May 12, 16:52:47 Can? I try making a DAC for 4Mbit/sec video, with 12 levels brightness using a few sync lines to say this is audio use audio out this is video convert to analog or this is data send through serial?
"Take Back the City ... By: albertusj. on 03 Mar 12, 16:00:44 "Take Back the City" is a song from alternative rock band? Snow Patrol's fifth album - Wikipedia
what song was? used ... By: billthejanitor. on 03 Mar 12, 07:50:53 what song was? used there?
If you mean ... By: albertusj. on 22 Nov 11, 08:55:58 If you mean encoding a digital audio/video stream, then yes I think so. Using a highly efficient data compression scheme such as MPEG4 and a multilevel modulation scheme, it should? be possible to make fully digital VHS.
Can this? be done ... By: Celiecinema1. on 21 Nov 11, 20:53:08 Can this? be done with video as well?
Unfortunately my ... By: albertusj. on 11 Sep 11, 09:46:33 Unfortunately my encoding scheme isn't directly compatible with PCM501ES.? If you have a tape that needs to be transferred, I have a friend in Japan that may be able to help....
Is it possible to ... By: BlueNeon81. on 09 Sep 11, 15:18:40 Is it possible to send you? a VHS PAL encoded with PCM 501 ES? :)
Is it possible to ... By: BlueNeon81. on 09 Sep 11, 15:18:38 Is it possible to send you a VHS PAL encoded with PCM 501? ES? :)
It should be ... By: albertusj. on 25 Oct 10, 15:40:42 It should be possible if I use a SVHS deck and perhaps write the digital data direct to tape using biphase mark encoding...ie bypass all the video circuits and write to tape direct. That? would require getting tinto the guts of the deck though.
Is this 24 bit ... By: bumtownv2. on 25 Oct 10, 15:14:56 Is this 24 bit audio and can you make a multitrack or a Dolby Digital version of this thing??
The dropouts are ... By: albertusj. on 06 Sep 10, 09:44:44 The dropouts are caused? by buffer under/overruns caused by mismatched playback clocks I haven't been able to fix yet. Right now my PCM processor isn't compatible with the Sony offerings mostly because I have no 501 encoded material to work on.I have the PCM-F1 specs from books and patents, but no ACTUAL tape to test. Thank you for your interest.
For? sure it's not ... By: bruno70. on 06 Sep 10, 00:31:51 For? sure it's not an easy task, You have made an amazing project. I remember the Sony PCM-501 also gives droputs when used with VHS, S-VHS gives better error correction. It would be interesting if there is a PCM-WAV to interlaced DV video software converter to do tests of decoding only, this to bypass the real time CD via spdif encoding.
Right now? it's ... By: albertusj. on 05 Sep 10, 09:02:41 Right now? it's coded for PAL operation.This allows me to record at 44.1kHz. This is unfortunately not the final version.Other commitments keep me from finishing it. Visit my site for more info
Nice Work! a? DIY ... By: bruno70. on 04 Sep 10, 23:36:07 Nice Work! a? DIY PCM adapter. It's only PAL or can work with NTSC signals?
To transfer from ... By: albertusj. on 23 Feb 10, 14:53:45 To transfer from VHS digital to CD one would need the adapter. The adapter is required to extract the PCM audio from the video signal. The adapter has a SPDIF output enabling you to dump? the audio data to computer or whatever.
oh one more thing ... By: icecoldcity. on 23 Feb 10, 09:55:27 oh one more thing so if I want to transfer what I? recorded on VHS Tape onto a CD do I still have to Use The Adapter or will I not need it for that.
Like once the signal is recorded on VHS digital.
Do I have to use the adapter to transfer recording to maybe my computer or my stand-a-lone cd burner?
Using a PCM adapter ... By: albertusj. on 23 Feb 10, 06:18:59 Using a PCM adapter to record digital audio to VHS tape as opposed to using the analog Hi-Fi tracks on the tape will bring about ~10dB improvement in dynamic range as well as a reduction? in wow and flutter. Yes, It'll sound better.
So tell me what ... By: icecoldcity. on 22 Feb 10, 19:43:07 So tell me what does it matter that the? audio is digital? Does it sound better that way?
Yo know like say I wanna hook my computer into my VCRrecorder right. I just straight connect my RCA jacks from my VCR to PC.
so whats the difference?
Does the recording sound any better with or without the PCM converter?
I'm not entirely ... By: albertusj. on 22 Feb 10, 06:20:15 I'm not entirely sure what you mean? VHS tapes store analog video and analog Hi-Fi sound.? This method uses the available video storage space to store digital sound instead. This effectively turns a VHS recorder into a DAT recorder. CDs were mastered for years using U-matic video tape and devices similar to the one I constructed. Look up Sony PCM-1 and PCM-F1 also Sony 1630.
So whats the point ... By: icecoldcity. on 21 Feb 10, 21:08:37 So whats the point why not just? connect straight to the RCA jacks.
Does this process make it sound more true to the digital signal?
That's? right it ... By: albertusj. on 29 Jan 10, 19:21:13 That's? right it was called "Backer".
In the 1990s? there ... By: vwestlife. on 29 Jan 10, 04:28:31 In the 1990s? there were some companies which sold interfaces to hook up your VCR to your computer and use it as a file backup device.
VHS Hi-FI stereo is ... By: albertusj. on 29 Jan 10, 04:22:33 VHS Hi-FI stereo is still analog FM modulated audio. It's "near" CD quality. The point here wasn't to add digital audio to video, but rather to use the VHS tape as a? digital data storage medium.
Nice, but rather ... By: vwestlife. on 29 Jan 10, 01:50:40 Nice, but rather pointless, since VHS Hi-Fi? Stereo is already CD quality.
rapaz...eu tenho ... By: buckmetta. on 07 Jul 10, 22:58:00 rapaz...eu tenho uma tralha dessas funcionando perfeitamente....passei todas minhas fitas? beta pra digital graças ao SL 30...senão teria sido impossive - se souber de alguem que queira fazer a conversao taí meu endereço no youtube - buckmetta.
http://www.myprius.c o.za/pcmx2_processor 1.htm gives more information on this project built using the dsPIC33.A PCM adapter converts PCM digital audio into a pseudo video signal that can be recorded onto regular video tape, turning any VCR (VHS,BETA,8-mm, U-Matic) into a DAT recorder.
http://www.myprius.c o.za/pcmx2_processor 1.htm gives more information on this project built using the dsPIC33.A PCM adapter converts PCM digital audio into a pseudo video signal that can be recorded onto regular video tape, turning any VCR (VHS,BETA,8-mm, U-Matic) into a DAT recorder.
http://www.myprius.c o.za/pcmx2_processor 1.htm gives more information on this project built using the dsPIC33.A PCM adapter converts PCM audio into a video signal that can be recorded onto video tape, turning any VCR into a DAT recorder.
The timing of the ... By: albertusj. on 09 Dec 11, 07:41:44 The timing of the video signal isn't actually the problem. The playback data clock needs to be synced to the recorded playback rate with a PLL. Right now the playback clock is free-running and samples get dropped. I was very? careful to make the PAL (CCIR 625/50) standard compliant. Thank you for watching. Is your sony 16-bit capable?
it is quite amazing ... By: noisedownloader. on 15 Oct 11, 04:09:24 it is quite amazing, i just had no idea in which other? shape sound can be projected
your interpretation ... By: albertusj. on 14 Oct 11, 16:52:04 your interpretation is actually not far off. It can be done. CDs were mastered using? this type of technology and videotape during the early 80s before hard disk recorders and CDR came around
How the hell this ... By: noisedownloader. on 14 Oct 11, 12:04:48 How the hell this can be done? it looks like sound registered in a? bar- code label
this changed my ... By: MrChillspot. on 26 Jan 11, 04:59:26 this changed my entire outlook on life.....? thank you
interesting, I'd? ... By: Salmagundiii. on 01 Mar 09, 16:40:08 interesting, I'd? always wondered what the output of a PCM-F1 looked like.
http://www.myprius.c o.za/pcmx2_processor 1.htm
gives more information on this project built using the dsPIC33.A PCM adapter converts PCM audio into a video signal that can be recorded onto video tape, turning any VCR into a DAT recorder.
Just imagine trying ... By: Kittyslasher69. on 25 Apr 10, 03:13:38 Just imagine trying to record a PCM adapter image onto a DVD. ? Boy would that give a new meaning to DVD-audio; but with technology made for VHS tapes.
http://www.myprius.c o.za/pcmx1_processor .htm shows the actual circuit.This allows me to record 44.1KHz 16bits/sample stereo sound using a normal VHS video recorder.
was the frame rate ... By: physicmad. on 29 Apr 12, 10:34:28 was the frame rate on this actual? i can? understand the frame buffer would be running slower with a load more samples.
Right? now the ... By: albertusj. on 10 Apr 09, 17:02:16 Right? now the system is only a prototype. It accepts data at 1.5Mb/s
Is? it too ... By: t0nito. on 09 Dec 08, 00:37:53 Is? it too expensive to build?
This is so cool! I ... By: t0nito. on 09 Dec 08, 00:34:37 This is so cool! I wouldn't mind having a VCR/DAT recorder myself :P so I guess you can also? record Dolby Digital recordings using this device?
I built this? ... By: albertusj. on 23 Mar 08, 13:41:06 I built this? myself.
Which processor are ... By: kbotwich. on 23 Mar 08, 01:45:21 Which processor are you using? The PCM-1600??
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