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HCT will probably even sound better as the signal transitions will be faster and synchronous. Think going from 127 to 128 where seven bits go from 1 to 0 and one bit goes vice versa. In CMOS technology, both transitions are equally fast. In NMOS technology, going from 1 to 0 is faster than the other way around, hence there will be a short value of zero in between 127 and 128.
As for mixing with pokey signals, a simple passive mixer will do, for example, route them through a 4k7 resistor and tie them together. If you use a 10k pot and use the wiper as output, you can adjust the balance as you see fit.
ivop
Member Since 14 Aug 2008OFFLINE Last Active Feb 8 2012 7:00 AM
Posts I've Made
In Topic: Atari Cassette Preservation?
Sat Jan 14, 2012 6:18 AM
If I seemed to imply that redundancy is the sole purpose of using wave files for preservation, I'm sorry about that. It's just something extra on top of being closer to the original.
For day to day usage I'd use a .cas file, too.
@marius, I hadn't even thought about the timbre of the sounds. Thanks for pointing that out.
As for whether the arcane skill of copying data to preserve it will be lost, I don't think so, but it can be forgotten (i.e. the act of copying). For reference, think about all the celluloid films from the early 20th century that are already lost because they were not copied soon enough and those that will be lost in the coming years because there is not enough time and manpower to preserve them.
BTW There are people that actually make hardcopies of digital text to prolong preservation in case making a digital copy in time is forgotten. Quite recently somebody on here wrote he made hardcopies of all Atari related documents he downloaded from the internet. A decent pigmented ink on quality paper and stored under proper conditions will be good for hundreds of years.
Yes, this might be a bit overkill, but who knows....
For day to day usage I'd use a .cas file, too.
@marius, I hadn't even thought about the timbre of the sounds. Thanks for pointing that out.
As for whether the arcane skill of copying data to preserve it will be lost, I don't think so, but it can be forgotten (i.e. the act of copying). For reference, think about all the celluloid films from the early 20th century that are already lost because they were not copied soon enough and those that will be lost in the coming years because there is not enough time and manpower to preserve them.
BTW There are people that actually make hardcopies of digital text to prolong preservation in case making a digital copy in time is forgotten. Quite recently somebody on here wrote he made hardcopies of all Atari related documents he downloaded from the internet. A decent pigmented ink on quality paper and stored under proper conditions will be good for hundreds of years.
Yes, this might be a bit overkill, but who knows....
In Topic: Atari Cassette Preservation?
Wed Jan 11, 2012 12:56 PM
ijor, on Wed Jan 11, 2012 11:07 AM, said:
ivop, on Wed Jan 11, 2012 6:37 AM, said:
For emulation purposes, .CAS is fine and those can always be extracted from wave files... As for preservation, think hundreds of years. If .CAS files get corrupted over the years (degradation of storage media) and there's no error-free file available anymore, the information is lost forever. Wave files on the other hand contain a lot of redundancy. A bit of corruption is less likely to destroy all of the information.
Yes, and that's exactly the problem with digital data. Current storage solutions are not built for the ages like, say, engraving in stone or titanium plates
ijor, on Wed Jan 11, 2012 11:07 AM, said:
But corruption or media failure would probably affect an analog audio as much as a digital CAS file. Files are usually stored compressed, a single bit corruption might mean the whole archive is gone. A virus might corrupt the operating system metadata. A hard disk crash means (usually) that everything is gone. You don't gain too much by storing the original audio, at least not in this sense.
Most compression formats do not handle even slight corruption, i.e. a few bits being off. That's why most compression formats are not suitable for long (and I mean Looong) time storage on weak storage media. An uncompressed wave file is way more error-resilient. Basically, if you increase the entropy, you lose more data if a bit gets lost.
ijor, on Wed Jan 11, 2012 11:07 AM, said:
Btw, Ivo, thanks for "your" Pokey donation to visual6502
You're welcome
