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Coaxial Audio Filter

Hi,

I have a quastion to ask. It requires a bit of explanation so listen up!

I have a very, very old television at home (I estimate it was purchased around 1985). Due to its age, it lacks any facility for changing the tone of the audio (i.e bass, middle treble). The tone of the audio has a lot of bass in it. Basically (no pun intended), I want to get a higher frequency tone (i.e more treble) and reduce the bass. I suspect I might need some kind of filter. Preferably , I would not like to have to open the television. I imagine some kind of filter unit could be placed between the cable (coaxial) and the RF on the televison. The television has no SCART.

Please Help!!!!

Reply to
mjdoyle
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Can't be done via the coax. you would need to put a low end blocking filter or a high pass filter on the speaker or speakers themselves.

I suppose you could find a tuner box or a VCR that allows you to adjust the tone and then outputs your TV on chnl 3 or 4...

Reply to
DBLEXPOSURE

Filtering at the low impedances of the speakers will be a problem... he'd need to be hand-winding big inductors, etc. If he's opening the case anyway, he should put his filter just ahead of the volume control, which should be easy to find. Or he might even find the shunt cap around there that is causing the present low-pass response.

Otherwise, he would essentially have to cut the bass while passing the treble, then boost the overall volume to compensate. That would give increased hiss... and my guess is that the reason the TV was built this way in the first place was to make the hiss less noticeable.

May not be worth a lot of trouble....

Best regards,

Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis

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Home of DaqGen, the FREEWARE signal generator

Reply to
Bob Masta

Get a TV serviceperson to fit headphone or audio-out sockets and attach a mixer and amplifier there.

doing it the way you want requires demodulation and re-modulating the FM audio signals that are coming up the antenna lead for whichever channel you have selected... the only practical way I can see to do that would be to inperpose a tuner (eg a VCR - possibly one with a broken playback mechanism) and then feeding the audio out signal from that into a mixer and then feeding it into a modulator (another broken VCR) and even then you have to select channels with the tuner (first broken VCR) rather than use the tuner that's built into the TV and you'll lose picture quality in the demodulation/remodulation process...

Bye. Jasen

Reply to
Jasen Betts

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