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If my wav file worked then..

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  If my wav file worked then.. "Brian Gaff" <Briang1@blueyonder.co.uk> - 2012-09-29 08:11 +0100
    Re: If my wav file worked then.. Volker Bartheld <dr_versaeg@freenet.de> - 2012-09-29 11:43 +0200
      Re: If my wav file worked then.. "Brian Gaff" <Briang1@blueyonder.co.uk> - 2012-09-29 11:36 +0100
    Re: If my wav file worked then.. Johny B Good <johnny-b-good@invalid.ntlworld.com> - 2012-09-29 15:05 +0100
      Re: If my wav file worked then.. "Brian Gaff" <Briang1@blueyonder.co.uk> - 2012-09-30 08:38 +0100
        Re: If my wav file worked then.. Tony <tony@darkstorm.invalid> - 2012-09-30 12:07 +0100
          Re: If my wav file worked then.. Johny B Good <johnny-b-good@invalid.ntlworld.com> - 2012-10-02 12:51 +0100
            Re: If my wav file worked then.. Duncan Snowden <duncan_s@talktalk.net> - 2012-10-02 13:52 +0100

#1481 — If my wav file worked then..

What other software is being asked for on wos that I might have? Not having 
the  patience to  attempt the oddball formums etc on the site, I'm happy to 
do the wav thing if we find anyything which is lost.
I seem to have quite a few of those tape magazines but they would make for a 
very big wav file I fancy!

Brian

-- 
From the Sofa of Brian Gaff Reply address is  active 

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#1484

[sup: fix typo]

On Sat, 29 Sep 2012 08:11:15 +0100, Brian Gaff wrote:
> I seem to have quite a few of those tape magazines but they would make
> for a very big wav file I fancy!

Wasn't there some tool that could create tzx (or other formats) on the fly
while you played the tape? I figure that with some halfways reasonable
audio quality (no distortions, magnetic head adjusted, ...) it should be
more or less a nobrainer.

This would reduce file size considerably.

Volker

-- 
@:  I N F O at B A R T H E L D dot N E T
3W: www.bartheld.net

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#1485

I'm sure there is, but whether its accessible to me is a whole other thing 
entirely.

Brian

-- 
From the Sofa of Brian Gaff Reply address is  active
"Volker Bartheld" <dr_versaeg@freenet.de> wrote in message 
news:zz057tmzflx6.dlg@news.bartheld.net...
> [sup: fix typo]
>
> On Sat, 29 Sep 2012 08:11:15 +0100, Brian Gaff wrote:
>> I seem to have quite a few of those tape magazines but they would make
>> for a very big wav file I fancy!
>
> Wasn't there some tool that could create tzx (or other formats) on the fly
> while you played the tape? I figure that with some halfways reasonable
> audio quality (no distortions, magnetic head adjusted, ...) it should be
> more or less a nobrainer.
>
> This would reduce file size considerably.
>
> Volker
>
> -- 
> @:  I N F O at B A R T H E L D dot N E T
> 3W: www.bartheld.net 

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#1486

On Sat, 29 Sep 2012 08:11:15 +0100, "Brian Gaff"
<Briang1@blueyonder.co.uk> wrote:

>What other software is being asked for on wos that I might have? Not having 
>the  patience to  attempt the oddball formums etc on the site, I'm happy to 
>do the wav thing if we find anyything which is lost.
>I seem to have quite a few of those tape magazines but they would make for a 
>very big wav file I fancy!
>
>Brian

 Converting the wav files into a compressed format such as MP3 (even a
lossy compression should suffice in this case) or AAC or Flac or
whatever will significantly reduce the file sizes.
-- 
Regards, J B Good

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#1490

I was not sure if the lossy compression might upset the loader.
Brian

-- 
From the Sofa of Brian Gaff Reply address is  active
"Johny B Good" <johnny-b-good@invalid.ntlworld.com> wrote in message 
news:6tvd689i0o36flecalr59fale00d6e1bhi@4ax.com...
> On Sat, 29 Sep 2012 08:11:15 +0100, "Brian Gaff"
> <Briang1@blueyonder.co.uk> wrote:
>
>>What other software is being asked for on wos that I might have? Not 
>>having
>>the  patience to  attempt the oddball formums etc on the site, I'm happy 
>>to
>>do the wav thing if we find anyything which is lost.
>>I seem to have quite a few of those tape magazines but they would make for 
>>a
>>very big wav file I fancy!
>>
>>Brian
>
> Converting the wav files into a compressed format such as MP3 (even a
> lossy compression should suffice in this case) or AAC or Flac or
> whatever will significantly reduce the file sizes.
> -- 
> Regards, J B Good 

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#1491

In comp.sys.sinclair, "Brian Gaff" <Briang1@blueyonder.co.uk> wrote:

>I was not sure if the lossy compression might upset the loader.

I find it incredible, but you can load games on the Speccy by playing them
via MP3 through an MP3 player.  Considering the trouble I had loading games
from an actual tape deck 30 years ago, this is mindblowing to me.
-- 
Tony Evans
Saving trees and wasting electrons since 1993
blog  -> http://perceptionistruth.com/
books -> http://www.bookthing.co.uk/
[ anything below this line wasn't written by me ]

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#1512

On Sun, 30 Sep 2012 12:07:54 +0100, Tony <tony@darkstorm.invalid>
wrote:

>In comp.sys.sinclair, "Brian Gaff" <Briang1@blueyonder.co.uk> wrote:
>
>>I was not sure if the lossy compression might upset the loader.
>
>I find it incredible, but you can load games on the Speccy by playing them
>via MP3 through an MP3 player.  Considering the trouble I had loading games
>from an actual tape deck 30 years ago, this is mindblowing to me.

 Not to me! I'd have been extremely surprised if this hadn't turned
out to be the case. If anything, I rather suspect you could gain an
improvement by limiting the bandwidth to just 3 times the frequency of
the highest tone used by the speccy tape interface and reduce the
sampling rate to 16KHz in the wav to mp3 conversion process (certainly
worth experimenting with).

 It's worth remembering that you're not recording a signal with the
complex waveforms normally associated with musical instruments, just a
mix of two or three frequencies up to their third harmonic to allow
the zero transition timings to be reproduced with sufficient accuracy
for the digital data stream thus encoded to be regenerated without
error.

 Feeding the tape output from a speccy (or any of the toy computers of
the day) straight into the line input of a PC soundcard[1] so as to
capture the 'audio' signal as a wav file for conversion into an
aggressively compressed mp3 produces a far cleaner and more accurate
signal for the 'tape readback' circuit to convert back into error free
data.

 You won't believe how difficult it can be to get an analogue tape
recorder to capture the zero crossing points of a 'simple' sinewave
being 'switched' between two frequencies with sufficient accuracy to
enable retrieval of the encoded data. Even a simple mp3 recorder can
manage a far better job in this respect.

[1] Or directly into an MP3 dictaphone.

-- 
Regards, J B Good

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#1513

On Tue, 02 Oct 2012 12:51:16 +0100
Johny B Good <johnny-b-good@invalid.ntlworld.com> wrote:

>  It's worth remembering that you're not recording a signal with the
> complex waveforms normally associated with musical instruments, just a
> mix of two or three frequencies up to their third harmonic to allow
> the zero transition timings to be reproduced with sufficient accuracy
> for the digital data stream thus encoded to be regenerated without
> error.

[snip]

>  You won't believe how difficult it can be to get an analogue tape
> recorder to capture the zero crossing points of a 'simple' sinewave
> being 'switched' between two frequencies with sufficient accuracy to
> enable retrieval of the encoded data. Even a simple mp3 recorder can
> manage a far better job in this respect.

Exactly what I was thinking: lossy compression can actually give you a
*better* save because it simplifies the signal. Nice to have it
confirmed by someone who knows what he's talking about, though.

-- 
Duncan Snowden.

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