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Analog loud and clear, digital silent.

stewie

stewie

Heard something odd on a local HD station I was hoping one of you engineers could help me figure out.

Tuned a station and the analog sounded fine. When my radio locked on digital the audio went away. For grins, I jumped to the HD-2 and it was working.

Can someone walk me through the "typical" (if there is such a thing) audio flow? I called the station and in a few minutes the HD was off entirely.

Curious how something like that happens.
 
There are folks with actual implementation experience on the board, but from the listener-perspective, this is what happens:

1. Your radio locks onto the analog signal while it buffers the digital one.
2. Once the buffer is satisfied, you hear the HD-1 signal.

Sounds like there's a failure before the importer, since the HD-x channels are okay...perhaps cross-post your inquiry to the Engineering board?
 
diymedia said:
There are folks with actual implementation experience on the board, but from the listener-perspective, this is what happens:

1. Your radio locks onto the analog signal while it buffers the digital one.
2. Once the buffer is satisfied, you hear the HD-1 signal.

Sounds like there's a failure before the importer, since the HD-x channels are okay...perhaps cross-post your inquiry to the Engineering board?
Click to expand...

Thanks for the input.

I'll do that.
 
This points to a new flaw with the system - not that the smug engineers who dreamed it up care about fixing it any more. When FM stereo was envisioned, the graceful path to failure was to switch or blend back to mono. Nothing but losing the signal completely would make the system go silent. It appears that the software algorithm in the radio has a defect, it should detect silence on the HD-1 and default back to analog. It can definitely do it - after all the software already has synchronization algorithms so the digital audio won't kick in off time from the analog. So it would be a simple matter to add fail safe for blank HD-1. Negligence on the part of the software coder.
 
rbrucecarter5 said:
This points to a new flaw with the system - not that the smug engineers who dreamed it up care about fixing it any more. When FM stereo was envisioned, the graceful path to failure was to switch or blend back to mono. Nothing but losing the signal completely would make the system go silent. It appears that the software algorithm in the radio has a defect, it should detect silence on the HD-1 and default back to analog. It can definitely do it - after all the software already has synchronization algorithms so the digital audio won't kick in off time from the analog. So it would be a simple matter to add fail safe for blank HD-1. Negligence on the part of the software coder.
Click to expand...

Silly question but do any of the radio's have the ability to detect silence and fail back to the analog at this point?
 
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