CHANNEL SELECTION METHOD FOR RADIO RECEIVER AND RADIO RECEIVER USING IT

CHANNEL SELECTION METHOD FOR RADIO RECEIVER AND RADIO RECEIVER USING IT

PURPOSE: To surely select a channel at a high speed by scanning channels in a frequency band of a signal when the signal is detected in a 1st scanning step and shifting a frequency of a local oscillator so that a desired channel frequency specified in a 2nd scanning step comes to the center of the b...

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1. Verfasser: MASAKI TATSUO
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
SELECTING RESONANT CIRCUITS
TUNING RESONANT CIRCUITS
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creator MASAKI TATSUO
description PURPOSE: To surely select a channel at a high speed by scanning channels in a frequency band of a signal when the signal is detected in a 1st scanning step and shifting a frequency of a local oscillator so that a desired channel frequency specified in a 2nd scanning step comes to the center of the band. CONSTITUTION: An upper side threshold voltage V2 and a lower threshold voltage V1 are set as shown in a characteristic of a frequency discriminator 103. An output voltage of a discriminator 103 with respect to a center frequency F0 of the current IF band is set to V0, then the voltage V2 corresponds to a frequency between the F0 and F0+(one channel step), the voltage V1 corresponds to a frequency between the F0 and F0-(one channel step), the voltage V4 corresponds to a frequency between the F0 and F0+(1/2 channel step), and the voltage V3 corresponds to a frequency between the F0 and F0-(1/2 channel step). When an output voltage Vd of the discriminator 103 is discriminated between the voltages V1 and V0, a desired frequency is searched.
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CONSTITUTION: An upper side threshold voltage V2 and a lower threshold voltage V1 are set as shown in a characteristic of a frequency discriminator 103. An output voltage of a discriminator 103 with respect to a center frequency F0 of the current IF band is set to V0, then the voltage V2 corresponds to a frequency between the F0 and F0+(one channel step), the voltage V1 corresponds to a frequency between the F0 and F0-(one channel step), the voltage V4 corresponds to a frequency between the F0 and F0+(1/2 channel step), and the voltage V3 corresponds to a frequency between the F0 and F0-(1/2 channel step). When an output voltage Vd of the discriminator 103 is discriminated between the voltages V1 and V0, a desired frequency is searched.</description><edition>6</edition><language>eng</language><subject>BASIC ELECTRONIC CIRCUITRY ; ELECTRICITY ; SELECTING RESONANT CIRCUITS ; TUNING RESONANT CIRCUITS</subject><creationdate>1996</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19960412&amp;DB=EPODOC&amp;CC=JP&amp;NR=H0897684A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19960412&amp;DB=EPODOC&amp;CC=JP&amp;NR=H0897684A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>MASAKI TATSUO</creatorcontrib><title>CHANNEL SELECTION METHOD FOR RADIO RECEIVER AND RADIO RECEIVER USING IT</title><description>PURPOSE: To surely select a channel at a high speed by scanning channels in a frequency band of a signal when the signal is detected in a 1st scanning step and shifting a frequency of a local oscillator so that a desired channel frequency specified in a 2nd scanning step comes to the center of the band. CONSTITUTION: An upper side threshold voltage V2 and a lower threshold voltage V1 are set as shown in a characteristic of a frequency discriminator 103. An output voltage of a discriminator 103 with respect to a center frequency F0 of the current IF band is set to V0, then the voltage V2 corresponds to a frequency between the F0 and F0+(one channel step), the voltage V1 corresponds to a frequency between the F0 and F0-(one channel step), the voltage V4 corresponds to a frequency between the F0 and F0+(1/2 channel step), and the voltage V3 corresponds to a frequency between the F0 and F0-(1/2 channel step). 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CONSTITUTION: An upper side threshold voltage V2 and a lower threshold voltage V1 are set as shown in a characteristic of a frequency discriminator 103. An output voltage of a discriminator 103 with respect to a center frequency F0 of the current IF band is set to V0, then the voltage V2 corresponds to a frequency between the F0 and F0+(one channel step), the voltage V1 corresponds to a frequency between the F0 and F0-(one channel step), the voltage V4 corresponds to a frequency between the F0 and F0+(1/2 channel step), and the voltage V3 corresponds to a frequency between the F0 and F0-(1/2 channel step). When an output voltage Vd of the discriminator 103 is discriminated between the voltages V1 and V0, a desired frequency is searched.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record>
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subjects BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
SELECTING RESONANT CIRCUITS
TUNING RESONANT CIRCUITS
title CHANNEL SELECTION METHOD FOR RADIO RECEIVER AND RADIO RECEIVER USING IT
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