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Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions. |
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18th May 2010, 1:52 am | #1 |
Hexode
Join Date: Jul 2004
Location: Michigan USA
Posts: 325
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Aurora test card audio tone frequency
While stumbling around the web tonight I came across what appears to be an oversight on my part in my converters. When I added the audio test tone to the rev 2.x and later hardware I coded it for 1kHz which is a modern standard. I realize now that the most commonly used test tone in the early days was 440Hz. Since I will be building a new batch of converters shortly I wanted to get some thoughts on whether I should leave the tone at 1kHz or change it to 440Hz.
Darryl |
18th May 2010, 6:35 am | #2 |
Dekatron
Join Date: Sep 2003
Location: Bolton, Greater Manchester, UK.
Posts: 6,644
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Re: Aurora test card audio tone frequency
1 Khz tone is fine by me. It is used as a test tone just about everywhere I have worked.
In the UK, BBC1 was 1 Khz, BBC2 was 440 Hz. Cheers, Steve P.
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If we've always had it, why is the Car Boot open? You're not sneaking another Old TV in are you...? |
18th May 2010, 7:43 am | #3 |
Retired Dormant Member
Join Date: Dec 2003
Location: North London, UK.
Posts: 6,168
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Re: Aurora test card audio tone frequency
IMO 440Hz is easier on the ear. Otherwise not important.
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18th May 2010, 9:42 am | #4 |
Nonode
Join Date: May 2006
Location: St Albans, Herts, UK.
Posts: 2,193
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Re: Aurora test card audio tone frequency
I'm with Jeffrey B on this. 440Hz is "nicer"! As you point out, it's the more authentic of the tones - unless of course you're going to reprogram the unit with test card D as an image...
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All the very best, Tas |
18th May 2010, 1:31 pm | #5 |
Hexode
Join Date: Jul 2004
Location: Michigan USA
Posts: 325
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Re: Aurora test card audio tone frequency
I have to say that I find 440 easier to listen to as well, but like Steve I almost expect the 1kHz since it's used just about everywhere today. This is just a firmware change so I have time to collect feedback until I'll need to program the units.
Darryl |