Re: Defeating MPX

Article View: sci.electronics

Article #14234

#14234

From: Aldo G. Cugnini
Date: Thu, 13 Jun 1991 12:58

15 lines
1150 bytes

In article <1991Jun12.191926.24744@ee.rochester.edu>,
strong@ee.rochester.edu (John Strong) writes:
|> The multiplex
|> filter is supposed to attenuate noise from FM signals that are
|> being decoded (for stereo separation).

Not quite.  The filter is usually intened to remove the (residual)
19kHz pilot tone from the audio output.  If this signal is strong enough,
it will cause the Dolby encoder to malfunction.

The filter is usually a 19kHz notch filter, but in a cheap receiver could
be just a lowpass filter.


agc

Technical Details

Message-ID: <1991Jun13.125800.29528@philabs.philips.com>

Path:

arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!think.com!linus!philabs!philabs!agc

References: <1991Jun10.173608.6540@rice.edu> <1991Jun10.175751.6926@rice.edu> <1991Jun12.191926.24744@ee.rochester.edu>

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!think.com!linus!philabs!philabs!agc
From: agc@briar.philips.com (Aldo G. Cugnini)
Newsgroups: sci.electronics,rec.audio
Subject: Re: Defeating MPX
Keywords: MPX filter tape deck
Message-ID: <1991Jun13.125800.29528@philabs.philips.com>
Date: 13 Jun 91 12:58:00 GMT
References: <1991Jun10.173608.6540@rice.edu> <1991Jun10.175751.6926@rice.edu> <1991Jun12.191926.24744@ee.rochester.edu>
Sender: news@philabs.philips.com (Usenet News)
Reply-To: agc@briar.philips.com (Aldo G. Cugnini)
Organization: Philips Laboratories
Lines: 15

Reply to Parent Message