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seanbaker
Posts: 228
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 Posted - Mon Feb 26, 2001 9:23 pm |
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Does anyone out there know the exact specific frequency ranges from low to top that are present in AM radio and also what type of limiting or compression is generally applied on air? I would like to create a band stop or pass or simply just knowing which sample rate to record in which would eliminate certain frequencies. I also want to configure the compression envelope to simulate on-air limiting/compression. My problem is I don't know specifics and my ear must not be helping because I've tried many varied things and they all sound good. I need to be able to create an AM preview for my jingles before selecting the best mix.
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Dave Merkel
Posts: 29
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| Posted - Thu Mar 01, 2001 12:54 pm |
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Hi Sean:
I don't recall the specific top and bottom frequencies ... but I do remember vividly the best bandwidth you can achieve from a Plain Old Telephone (POTS) line is 3.5kHz. I hope that helps.
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Dave Merkel
Posts: 29
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| Posted - Thu Mar 01, 2001 1:05 pm |
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Sorry Sean - I read your question wrong ... I initially glazed through your message and read it to mean photo line bandwidth. I guess it illustrates I should stop speed reading, eh??
Dave
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John Walch
Posts: 2
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| Posted - Thu Mar 15, 2001 4:30 am |
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You could perhaps try recording a few signals off air and use Cool's frequency analysis to get some idea of the bandwidth used
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Paul E. Burt
Posts: 1
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| Posted - Sat Mar 17, 2001 1:20 pm |
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AM radio's "sound" is wildly dependent on receivers, most of which are just awful. Modern AM transmitters are flat from 30HZ-10KHZ, with sharp drop-offs on each end (by law and by choice), and are rated in the 0.1% distortion range. AM processors are aggresive multi-band AGC devices, with with a somewhat gentle pre-emphasis applied before the final limiter and hard clipping on the output. Again, receivers vary so much -- from "humpy" car radios with nothing above 5K (even on FM, and that's a direct quote from a large auto radio manufacturor) to the 2" speakers in clock radios -- that I would urge caution. Here's my suggestion: obtain Radio Shack's latest MTR-series table radio (MTR-14?). **IF** you are handy with a soldering iron, run an external input to the volume control (extreme caution is urged). This should at least model the "boxy" sound of an average radio, and the AM section in the MTR-series is pretty good as well. And finally, really good audio quality and production values will always cut through. Good luck.
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York Audio
Posts: 80
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| Posted - Tue Mar 20, 2001 7:04 am |
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I'm not 100% sure about the US but in the UK AM band width is 9Khz, its all that can be fitted in the broacast band.
Its heavily compressed too.
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AM Radio broadcast specs (frequency ranges)