[BC] IBOC AM Quality

[padrino]

Craig,

I understand, fully, the scenario you describe. All the more reason to
employ dynamics processing that is codec-friendly, and offers some tonic,
to the ills of the transmission method.

-Frank

Broadcasters' Mailing List <broadcast at radiolists.net> writes:
>Frank,
>
>
>I do not think anyone would argue that having good clean source material 
>is the key to making low bitrate codecs sound tolerable (in the short 
>term).  In this day and age most agencies, other stations, etc 
>distribute spots in MP3 format.  Should you be discriminating enough to 
>use uncompressed music, your codec falls apart during spot breaks not to 
>mention talks stations have MP3 audio encoded programming via Starguide, 
>etc.  I hear it now in analog and it can only be exacerbated by 
>cascading data reduction algorithms.  In todays undereducated society 
>(and I mean at radio stations) converting to .WAV files is the fix.  
>Does DRM have the same low bitrate codecs?
>
>
>
>
>Craig Bowman
>Durand, MI
>
>
>
>
>padrino wrote:
>> Broadcasters' Mailing List <broadcast at radiolists.net> writes:
>>   
>>>> All of that being said, however, if you feed quality audio in, and 
>>>> process carefully - by which I mean keeping the sound open, not 
>>>> dense, and being careful about how you handle the high bands - AM 
>>>> IBOC can sound quite nice.
>>>>       
>>> You have to have a continual supply of very good weed to believe the 
>>> same grunge processing won't be used on the digital signals. It has 
>>> to be. Otherwise the constant mode switching in cars will drive the 
>>> listener nuts. Bad processing habits are very hard to break. The 
>>> minute the General Manager hears his signal softer than the 
>>> competition the order will go out to make it loud.
>>>     
>>
>> No amounts of 'whacky-tobacky' needed. :)
>>
>> Processing for lower bitrates requires that the audio processing is NOT
>> what we've come to know. Research has shown that low bitrate codecs DO
>NOT
>> like clipping...NOR...limiting that contains high levels of
>> intermodulation distortion (IMD). Most dynamic peak limiters exhibit
>high
>> IMD and this causes added 'artifacting' in the coder. Just spent a good
>> year working on this, and the proof is in the processing algorithms.
>>
>> Processing for HD does allow level normalization that eliminates
>> discrepancies when the receiver switches back-n-forth.
>>
>> -Frank Foti
>>
>> _______________________________________________
>>
>> The BROADCAST [BC] list is sponsored by SystemsStore On-Line Sales
>> Cable-Connectors-Blocks-Racks-Wire Management-Test Gear-Tools and More! 
>> www.SystemsStore.com       Tel: 407-656-3719    Sales at SystemsStore.com
>>
>>
>>   
>_______________________________________________
>
>
>The BROADCAST [BC] list is sponsored by SystemsStore On-Line Sales
>Cable-Connectors-Blocks-Racks-Wire Management-Test Gear-Tools and More! 
>www.SystemsStore.com       Tel: 407-656-3719    Sales at SystemsStore.com
>
>