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| Hum on second BT878 tuner http://forum.linhes.org/viewtopic.php?f=2&t=2803 |
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| Author: | aheinen [ Wed Oct 27, 2004 4:41 pm ] |
| Post subject: | Hum on second BT878 tuner |
Below is my third iteration on Myth Box: Athlon XP 1800+ FIC AN11 Motherboard with onboard via82xx sound 2 BT878 Capture Cards Soundblaster Live! Soundblaster (Ensoniq 5880) My first tuner is configured to use the onboard sound for audio capture and the records sound fine. I have configured the second card to use either of the soundblaster cards for audio capture but the sound has a hum whichever I use. I have tried changing the cable that pipes sound from the BT878 card to sound card. I have played with the alsamixer turning down/shutting off all unneccessary channels. I have researched the alsa configuration: # --- BEGIN: Generated by ALSACONF, do not edit. --- # --- ALSACONF verion 1.0.6 --- alias char-major-116 snd alias char-major-14 soundcore alias sound-service-2-0 snd-mixer-oss alias sound-service-2-1 snd-seq-oss alias sound-service-2-3 snd-pcm-oss alias sound-service-2-8 snd-seq-oss alias sound-service-2-12 snd-pcm-oss options snd device_gid=29 device_mode=0660 alias snd-card-2 snd-ens1371 alias sound-slot-2 snd-ens1371 post-install snd-ens1371 /usr/lib/alsa/modprobe-post-install # --- END: Generated by ALSACONF, do not edit. --- # --- BEGIN: Generated by ALSACONF, do not edit. --- # --- ALSACONF verion 1.0.6 --- alias char-major-116 snd alias char-major-14 soundcore alias sound-service-0-0 snd-mixer-oss alias sound-service-0-1 snd-seq-oss alias sound-service-0-3 snd-pcm-oss alias sound-service-0-8 snd-seq-oss alias sound-service-0-12 snd-pcm-oss options snd device_gid=29 device_mode=0660 alias snd-card-0 snd-emu10k1 alias sound-slot-0 snd-emu10k1 post-install snd-emu10k1 /usr/lib/alsa/modprobe-post-install # --- END: Generated by ALSACONF, do not edit. --- # --- BEGIN: Generated by ALSACONF, do not edit. --- # --- ALSACONF verion 1.0.6 --- alias char-major-116 snd alias char-major-14 soundcore alias sound-service-1-0 snd-mixer-oss alias sound-service-1-1 snd-seq-oss alias sound-service-1-3 snd-pcm-oss alias sound-service-1-8 snd-seq-oss alias sound-service-1-12 snd-pcm-oss options snd device_gid=29 device_mode=0660 alias snd-card-1 snd-via82xx alias sound-slot-1 snd-via82xx post-install snd-via82xx /usr/lib/alsa/modprobe-post-install # --- END: Generated by ALSACONF, do not edit. --- My cards are configured as follows: Audiodevice on cardid 1 is set to /dev/dsp0 Audiodevice on cardid 1 is set to /dev/dsp2 The CPU is 20% idle when recording two shows. What am I doing wrong? Any suggestions are appreciated. |
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| Author: | aheinen [ Mon Nov 08, 2004 3:26 pm ] |
| Post subject: | Bad Hardware |
Thanks to all that looked at this. I believe that this is a hardware problem. I swapped the tuners to the other audio cards and the hum follows the second card. So my second tuner must be bad!!! |
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| Author: | turpie [ Mon Nov 08, 2004 5:49 pm ] |
| Post subject: | |
I guess you've already narrowed down the problem, but one trick for testing the audio from a tv-card is to plug the speakers directly into the audio-out of the card. This eliminates the sound card from the chain, which can complicate the trouble shooting process. |
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| Author: | DrGonzo [ Mon Nov 08, 2004 9:55 pm ] |
| Post subject: | |
I'd actually point at the sound card and not the tuner. I had similar issues with one of the several sound cards I went through. I don't remember which one it was for sure, but I thought it was a SBLive 5.1. I put in a cheapo Yamaha PCI card and no more buzz. Gonz |
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| Author: | aheinen [ Sat Dec 04, 2004 9:22 pm ] |
| Post subject: | Finally Confirmation |
I got back a third tuner card I had loaned to a friend and replace the second tuner. NO HUM!!!! Finally I can record 2 shows. Thanks again for looking at this everybody. |
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