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AllStar
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Discussion Starter · #1 ·
Every once in a while in the middle of normal program watching, I get a loud pulse of a noise which sounds similar to 60 hz hum. It is quite loud compared to program audio and it is quite short in duration <= 1sec. I didn't think until now about rewinding to see if it is captured by the buffer, but I'll do that next time. I seems to only be coming from front and rear centers.

It has shown up on two different AVRs so I expect it to be coming from the HR21-200

EDIT: I was able to record the noise during US Open just now, so it is early in the receiver, not just audio out.

Has anyone seen such a problem before?

TerryB
 

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AllStar
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71 Posts
Discussion Starter · #4 ·
HDTVsportsfan said:
How is everything connected. HDMI?? or Component w/ R/W RCA ot Optical????

You should probably provide a bit more info about your setup.
The HR-21 has been hooked up both ways.
The Sony I'm running now has no HDMI, but the digital audio out (I can't remember if it's optical or RF) of the HR-21 is hooked up.
The Onkyo 606 which is out of the stack at the moment did have and use HDMI.
Both setups produced the noise pulse.

TerryB
 

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Hall Of Fame
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3,433 Posts
I'll take the bait: You haven't yet tried regular analog stereo with the R-W RCA jack outputs, DD off. Just connecting these cables will provide a ground path between your DirecTV receiver and your AVR, which doesn't now exist (although it did previously exist when you were switching HDMI through the 606, or if you're using coaxial audio). You could also try connecting another set between the other RCA jacks and your TV's audio inputs to see if the "pulse" sound comes directly through to the TV's audio.
 

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Just a thought here... does the sound occur at regular intervals?
 

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AllStar
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Discussion Starter · #9 ·
K4SMX,
The detail of whether the noise comes via analogs seems to have little value to me. The main question is am I the possesser of a faulty HR-21 with a problem unseen by others?

LarryFlowers,
The occurrences are so far apart only one or two per evening I've never tried timing.

MIMOtech,
I've heard RFI on audio before and this doesn't sound like that. No audible voice content and very short impulse length. Now, maybe something is winding up its frequency and outputting out of band for a moment, but the puluses again are so far apart as to preclude a "conversation" going on.

TerryB
 

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blah blah blah
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Terry, I would not so quickly dismiss Stew.
 

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TerryB said:
K4SMX,
The detail of whether the noise comes via analogs seems to have little value to me. The main question is am I the possesser of a faulty HR-21 with a problem unseen by others?

TerryB
Where I was going with that is that if you can establish that you don't have this problem with analog audio output, and you've tried two different AVR's (connected two different ways!), you've pretty much proven that there's a defect in your receiver's DD output, which I think is what you're trying to accomplish......
 

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My next question would be do they occur at or near the same time of the day...
 

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AllStar
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This happened when I had the HDMI cable connected from my HR20 to my television, and then a fiber optic (Toslink) cable from my television out to my A/V receiver.

When I connected the Toslink cable directly from my HR20 to my audio receiver, this static audio pulse went away.

I made a post about this on dbstalk.com when I first hooked up my HR20.

So you might make sure you have your cables running directly to your viewing/listening devices, not doing any pass-throughs.

Edit: Link to prior discussion about this problem: http://www.dbstalk.com/showthread.php?p=1204168#post1204168
 

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Legend
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168 Posts
I'm not sure if this is the problem you are having but it sort of sounds like the known stutter/buzz sound on Directv HD channels. I have had a random stutter/buzz sound on some channels lHD channels. They are usually my locals but have heard on a few other channels. It doesn't happen on the same channel all the time. I haven't heard the stuttering/buzz randon sound on any channels the last few days. From what I have been told it is a known Directv problem for some HD channels. I know I'm not much help but just wanted to let you know it could possible be a known problem with Directv.
 

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AllStar
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71 Posts
Discussion Starter · #15 ·
K4SMX,
Since I found that the noise IS stored in the buffer, I can save it and replay through various output schemes. From the other responses received, I am beginning to suspect it is a generic DTV problem rather than my specific hardware.

TerryB
 

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Well, yeah, donm may have your answer. It was the "60Hz" description that kind of led me away from that idea. What you're hearing is very likely to be the "brrrrrr" noise which I hear occasionally and usually on DirecTV's re-broadcast of network local HD's, when the mpeg2:mpeg4 converters have a hic-up.
 

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Cool Member
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When I have experienced it, I noticed that my receiver had lost the Dolby Digital sync for a second. I can rewind and it will repeat in the exact same spot. I have been able to reproduce it on another DVR in the exact same spot. Therefore, I have concluded that it is an encoding issue with the audio track. Taking it one step further, in one instance, the source audio (from the network,cable) had a very small audio glitch that got magnified on the mpeg-4 encoders. This happens very rarely for me, but it is very annoying.
 

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AllStar
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K4SMX said:
Well, yeah, donm may have your answer. It was the "60Hz" description that kind of led me away from that idea. What you're hearing is very likely to be the "brrrrrr" noise which I hear occasionally and usually on DirecTV's re-broadcast of network local HD's, when the mpeg2:mpeg4 converters have a hic-up.
I have also experienced this for quite some time. And it seems to be on the locals more than other channels. Your description of the event is dead on.

Hopefully it will be fixed someday.

Mike
 
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