audiomagnate
1000+ Head-Fier
- Joined
- Nov 9, 2005
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Here's the master plan:
Quote:
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Dear Mr. Sweeney,
Most of the listening to news programming is done in the car and on small home mono radios. This has been known in the radio industry for many years.
Regardless of overall signal strength, a very important consideration is that obstacles, which an FM signal may encounter in the line-of-sight path, tend to reflect and disperse the signal in many directions. FM coverage is limited by obstacles - hills, buildings, trees - all of which reflect and tend to weaken and dissipate the transmitted signal. In many locations, especially in urban areas where many tall buildings interfere with the direct transmitted signal or in areas surrounded by hills, mesas or mountains, an FM receiver may pick up a station’s primary signal but, also, several secondary reflections coming from various directions. These reflections arrive at the receiver out-of-phase —slightly delayed in time—with the primary signal and tend to blur or distort the principal signal. The result, known as multipath distortion, is the equivalent of the familiar ghosts in TV reception. These problems are most prevalent in the mobile environment. The audible effect can range from a low-level fuzziness to a severely distorted sound quality, particularly at the high frequencies or treble. The degree of distortion depends on the number and relative strength of the reflections.
Multipath distortion is especially troublesome in FM stereo reception. Since stereo broadcasts consist of several signal components transmitted on the same radio wave, any change in the phase or relationship of these components can degrade or destroy the stereo quality. The reason a stereo broadcast may sound more acceptable when transmitted in the mono mode is that multipath effects on the stereo information of the FM signal, as well as the stereo information itself, are removed.
KPRN also feeds many translators in the western part of the state. These translators provide service to Meeker, Craig, Rangley, Ouray and Parachute. These towns have always suffered from week, noisy signals from KPRN. By switching to mono we have increased signal strength and are now providing cleaner signals to these listeners.
The Colorado Public Radio Engineering department was remiss by not going to mono years ago when KPRN was changed to a News only channel. All CPR News FM stations in the state will be switched to mono in the coming weeks. The Denver and Boulder stations are AM. Colorado Public Radio will start broadcasting HD radio on KPRN and KPRH within the next year. The HD digital signal will be in stereo and will also carry HD2 second channel programming.
This will give us a robust analog signal suitable to mobile listening and the terrain in the Grand Valley area along with a digital stereo signal.
Sincerely,
Robert Hensler
VP Engineering
Colorado Public Radio
=========================================
End of quote. The garbage that this 96/48 kb/s "HD"garbage generates is causing them to switch to mono.
Quote:
================================================== =====
Dear Mr. Sweeney,
Most of the listening to news programming is done in the car and on small home mono radios. This has been known in the radio industry for many years.
Regardless of overall signal strength, a very important consideration is that obstacles, which an FM signal may encounter in the line-of-sight path, tend to reflect and disperse the signal in many directions. FM coverage is limited by obstacles - hills, buildings, trees - all of which reflect and tend to weaken and dissipate the transmitted signal. In many locations, especially in urban areas where many tall buildings interfere with the direct transmitted signal or in areas surrounded by hills, mesas or mountains, an FM receiver may pick up a station’s primary signal but, also, several secondary reflections coming from various directions. These reflections arrive at the receiver out-of-phase —slightly delayed in time—with the primary signal and tend to blur or distort the principal signal. The result, known as multipath distortion, is the equivalent of the familiar ghosts in TV reception. These problems are most prevalent in the mobile environment. The audible effect can range from a low-level fuzziness to a severely distorted sound quality, particularly at the high frequencies or treble. The degree of distortion depends on the number and relative strength of the reflections.
Multipath distortion is especially troublesome in FM stereo reception. Since stereo broadcasts consist of several signal components transmitted on the same radio wave, any change in the phase or relationship of these components can degrade or destroy the stereo quality. The reason a stereo broadcast may sound more acceptable when transmitted in the mono mode is that multipath effects on the stereo information of the FM signal, as well as the stereo information itself, are removed.
KPRN also feeds many translators in the western part of the state. These translators provide service to Meeker, Craig, Rangley, Ouray and Parachute. These towns have always suffered from week, noisy signals from KPRN. By switching to mono we have increased signal strength and are now providing cleaner signals to these listeners.
The Colorado Public Radio Engineering department was remiss by not going to mono years ago when KPRN was changed to a News only channel. All CPR News FM stations in the state will be switched to mono in the coming weeks. The Denver and Boulder stations are AM. Colorado Public Radio will start broadcasting HD radio on KPRN and KPRH within the next year. The HD digital signal will be in stereo and will also carry HD2 second channel programming.
This will give us a robust analog signal suitable to mobile listening and the terrain in the Grand Valley area along with a digital stereo signal.
Sincerely,
Robert Hensler
VP Engineering
Colorado Public Radio
=========================================
End of quote. The garbage that this 96/48 kb/s "HD"garbage generates is causing them to switch to mono.
