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About canyouhearmenow

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    production and post audio
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    electronics engineer, hobby sound guy
  • Interested in Sound for Picture

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  1. Question re the Sennheiser G3 units. I know the full size 1/2 rack mounted size receivers ARE true diversity. There are two complete receivers in there and the audio is selected by Rx signal strength. I have no experience with the small body pack size receivers. Are the small sized body pack receivers NOT also true diversity? Do they also have 2 receivers or the fake diversity with one receiver switching between antennas during a fade? thanks Mark
  2. If you are talking about the "tremolo" type sound on the speaker's voice, that could be caused by a defective time base in the recorder. Was it set for external sync mode? It could happen over a very narrow range of temperature. Repairing that in post will not be easy. Your issue is similar to wow and flutter. Google techniques for removing wow and flutter. If you somehow? can map the frequency variation and then create and add a tone with that variation and then use "autotune" to remove the variation, then remove the tone? Good luck. Mark A thought, is there any "hum" or other steady tone in the recording that can be used as a reference to help "undo" the wow and flutter?
  3. really old footage also seems to be played at high speed why? mark
  4. To reduce wear and tear on the connectors of expensive instruments in the lab we use "connector savers". Leave these adapters on the receiver, replace as needed. https://www.minicircuits.com/pdfs/SF-MQK50+.pdf or https://www.americanradiosupply.com/sma-male-to-sma-female-coaxial-adapter-connector-saver/ etc. Mark
  5. As an electronics engineer, I have had a problem interfacing audio gear that was digital and has poor filtering of ultrasonic spurious outputs. If your source does an inadequate job removing spurious outputs above 20 kHz and your sink is susceptible to these frequencies, you may get audible noise that is not really the "fault" of either one but is an incompatibility. You can check this two ways. Use an oscilloscope to see if there are any unwanted ultrasonics on the signal and or insert a low pass filter in the path. I have had to design and add such a low pass filter in one particular case like this. Mark
  6. Some Sennheiser wireless systems use an ultrasonic PILOT tone. There may be an interaction with that. You might try turning off the pilot tone feature in both the Rx and Tx. Mark
  7. Hi, what kind of mic are you using? And is it wired or wireless? Mark
  8. If this is an analog FM system, probably an artifact of the companding and pre-emphasis in the Tx. Does the key jingle test produce the same artifact? You could suggest he turn down the level at the Tx and up at the Rx. Mark
  9. A newbie question, is time code as an audio signal agnostic to polarity, i.e. 180 deg phase shift? Mark
  10. I don't know if this applies also to the BLX series or not. https://www.shure.com/americas/support/find-an-answer/pgx-and-slx-wireless-audio-level-varies-more-than-expected I give credit to Shure for explaining this openly in their forum. This compression / expansion mismatch can be an issue with this technology. Also it may or may not be important in your in your applications. Actually the dropoff is sometimes helpful to reduce feedback in live sound applications. Mark
  11. perhaps the issue is due to acoustic ultrasonics rather than RF? Mark
  12. itry3d, can you contact me directly? I left a message on google docs
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