Re: microphone hum

On 30 Jan 2006 20:58:25 -0800, "Tom St Denis" <tomstdenis@xxxxxxxxx>
wrote:

>
>Phil wrote:
>> I'm not knowledgeable in DSP, but maybe someone here can help.
>>
>> I have a cheapo electret microphone that is giving a bad hum, at 15754hz
>> and 60hz
>
>60hz is probably from not having a common ground. That's common for
>desktop computers hooked up to stereos or tvs and getting lines or that
>hum.
>
>As for 15754hz that's probably aliasing from the sample rate you chose.

The combination of 60Hz and 1575xHz points to interference from a
(probably north american) television set or video signal.

60Hz is the vertical frequency, 15750Hz is the horizontal frequency.

Regards,
Allan
.

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