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Browse Prior Art Database

AM FILTER AS WSSB FILTER WITH NEW "IF" EQUIVALENT FREQUENCY

IP.com Disclosure Number: IPCOM000006087D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2001-Dec-03

Publishing Venue

Motorola

Related People

Authors:
Moshe Ben-Ayun Yehuda Edry Tamar Iscovici

Abstract

As is shown in AM Mode, the "IF" bandwidth required for audio signal detection is 2 x audio band- Most modern radios consist of dual conversion width. receiver, including two "IF" (Intermediate Frequency) stages. The first "IF" at high frequency is in order to In SSB Mode, the "IF" bandwidth required is the prevent image spurious. The second "IF" at low same as the audio bandwidth. frequency uses narrow band crystal filter providing the required selectivity. Let us assume audio bandwidth of 2.7kHz.