You feed a part of the signal from your receiver's output back to the mic stages - but in opposite phase to the speaker's signal - and, the need for the antivox dissapears.. except, mic stages have to be "clever" enough to cover for the different volume of your listening habits..
It will just not know where the speaker is.. is it on the shelf abowe, at the back of the room or under the table.
An ordinary PA system breaks into acoustical feedback howling regardless of the phase of the wires on the speaker because the phasing is different at each frequency.
Speakerphones have the mic and speaker very close together so reflections in a room won't affect phasing but they don't use simple reversed phase to cancel the amount of speaker sound picked up by the mic. Because the phasing is different at each frequency.
How about posting a photo of the inside of this infamous device?.
An ordinary PA system breaks into acoustical feedback howling regardless of the phase of the wires on the speaker because the phasing is different at each frequency.
Speakerphones have the mic and speaker very close together so reflections in a room won't affect phasing but they don't use simple reversed phase to cancel the amount of speaker sound picked up by the mic. Because the phasing is different at each frequency.
You need a buffer or amp between the LO and mixer as someone else has already mentioned.
Should be like LO----Amp ---LPF---attn pad---mixer. The pad helps match Z. All your ports should have same Z, whatever it may be.
The LPF helps keep unwanted crap out of your mixer, mainly your second harmonic which will be quite large.
Who ever wrote that article is sadly mistaken.Oh, hey Mike. Didn't think anyone was up. You know I read an article where it specifically said, "Do not use a buffer" right there.
Who ever wrote that article is sadly mistaken.
And like I have been saying put a seperate regulator for your LO.
You want a clean setup then do this;
Vcc----->Vreg---->Lo---Amp--->LPF---->Attn---->Mixer
And I am up late working homework. Have a 4 week intersession class. The 4 week class is the same as a normal semester class of 16 weeks. So no time to sleep. I stop by here when I need a break.
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