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| Thread ID: 34791 | 2003-06-24 03:56:00 | USB Microphones - Laptop Power Supply Noise Problems | Perigrin (4081) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 154655 | 2003-06-24 03:56:00 | I have just purchased an ANDREA NC 7100 USB Mike to use with Dragon Naturally Speaking V6.0 It was touted as the answer to the Laptop users prayers as it by-passes the sound card. However I get worse results from this than I ever did from the normal mike. This is due to 50 Hz noise from the power supply I get good results when working on battery but this is not an option for obvious reasons. Does anyone have a solution to this problem ? |
Perigrin (4081) | ||
| 154656 | 2003-06-24 05:58:00 | I am surprised that a laptop power supply emits much 50 Hz EMI, as they usually employ switchmode technology that emits a much higher (several kHz) frequency. Transformer based power supplies would be a problem, but I have never encountered one on a laptop. I wonder if its due to capacitive coupling with the 50 Hz, as these power supplies do not use an earth? |
godfather (25) | ||
| 154657 | 2003-06-24 19:52:00 | You could well be right - I would not have a clue - I am truly clueless in this area. Could you speculate on a cure, or a way to mitigate the problem? |
Perigrin (4081) | ||
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