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#1
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Now, who was it testing something like this on Medium Wave in London? Eh?
Anyone? ;-) "Mike Terry" wrote in message ... Instead, domestic use of DRM on longwave, mediumwave and the proposed VHF allocation, where armchair listeners will value increased choice and audio quality, is where this technology may more comfortably sit. |
#2
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Hello,
What happens when the signal fades out? With a normal AM transmission it is still possible to hear the station into the noise and back again. With digital it will be on and then completely off - so will be difficult to listen to. I certainly wouldn't associate digital radio with audio quality. When DAB first come out it was great, but not now as so many stations are crammed into each multiplex to make money. Audio quality suffers because of low bitrates and a lot of stations are in mono. Digital radio has a long way to go. "freddie kreuger" wrote in message ... Now, who was it testing something like this on Medium Wave in London? Eh? Anyone? ;-) "Mike Terry" wrote in message ... Instead, domestic use of DRM on longwave, mediumwave and the proposed VHF allocation, where armchair listeners will value increased choice and audio quality, is where this technology may more comfortably sit. |
#3
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DRM uses Coded Orthogonal FDM which is resilient to specific types of
fading. You can find out more about it he http://www.bbc.co.uk/rd/pubs/papers/...paper_15.shtml There's plenty of scope within the scheme for tinkering by broadcasters, so that it's more resilient to observed conditions within the particular band. But, whether or not you think the results are any good is of course subjective. When the signal's weak I would liken the results to how GSM sounds; it drops out and echos. There were some mp3's knocking about on the web of actual received results at different SNR's. I listened to some of these, which were of classical music, and I thought the results were pretty good. By the way, I agree with you about DAB - the more crap they cram into the same bandwidth, the worse it's going to sound. I know BBC engineers who've been involved with it and who also agree with you! But, it's all about money and getting people to sign up. Anyway back to DRM: This from http://www.hard-core-dx.com/index.php?topic=drm&page=4 BBC Monitoring has listened to the latest broadcasts using a Franhofer DRM software enabled PC receiver coupled to an AOR shortwave receiver with an active whip antenna. The low bit-rate digital audio from DRM does exhibit slight evidence of the process of audio compression. Occasional drop-outs have been observed and the audio quality can degrade to an echo and then either recover or cut to silence for a short period. The audio quality on speech and music is good and all the signals heard so far have sounded less distorted than the lowest bit rates of 48 and 64 kb/s via DAB (Eureka 147 digital audio broadcasting). "GT" wrote in message ... Hello, What happens when the signal fades out? With a normal AM transmission it is still possible to hear the station into the noise and back again. With digital it will be on and then completely off - so will be difficult to listen to. I certainly wouldn't associate digital radio with audio quality. When DAB first come out it was great, but not now as so many stations are crammed into each multiplex to make money. Audio quality suffers because of low bitrates and a lot of stations are in mono. Digital radio has a long way to go. |
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