Noise detector for frequency modulation systems

Noise detector for frequency modulation systems

A hands-free telephone system is disclosed utilizing an infrared transmitter and receiver to permit wireless speech transmission. The transmitter uses frequency modulation imposed on the infrared signal and includes carrier shift signaling arrangements for indicating a low battery condition and tran...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: CELLI, JOHN R, NASH, DONALD H
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
TRANSMISSION
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
container_end_page
container_issue
container_start_page
container_title
container_volume
creator CELLI
JOHN R
NASH
DONALD H
description A hands-free telephone system is disclosed utilizing an infrared transmitter and receiver to permit wireless speech transmission. The transmitter uses frequency modulation imposed on the infrared signal and includes carrier shift signaling arrangements for indicating a low battery condition and transmitter turn-off. The receiver utilizes a noise detection circuit for permitting remote turn-on, for squelching noise in the voice path, and for feeding an alerting signal to a loudspeaker to indicate that the received signal is excessively noisy. The portable transmitter must then be moved or redirected to provide a better line-of-sight signaling path.
format Patent
fullrecord <record><control><sourceid>epo_EVB</sourceid><recordid>TN_cdi_epo_espacenet_US4228320A</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>US4228320A</sourcerecordid><originalsourceid>FETCH-epo_espacenet_US4228320A3</originalsourceid><addsrcrecordid>eNrjZND3y88sTlVISS1JTS7JL1JIA-Gi1MLS1LzkSoXc_JTSnMSSzPw8heLK4pLU3GIeBta0xJziVF4ozc0g7-Ya4uyhm1qQH59aXJCYnJqXWhIfGmxiZGRhbGTgaExYBQDB5SrP</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>patent</recordtype></control><display><type>patent</type><title>Noise detector for frequency modulation systems</title><source>esp@cenet</source><creator>CELLI; JOHN R ; NASH; DONALD H</creator><creatorcontrib>CELLI; JOHN R ; NASH; DONALD H</creatorcontrib><description>A hands-free telephone system is disclosed utilizing an infrared transmitter and receiver to permit wireless speech transmission. The transmitter uses frequency modulation imposed on the infrared signal and includes carrier shift signaling arrangements for indicating a low battery condition and transmitter turn-off. The receiver utilizes a noise detection circuit for permitting remote turn-on, for squelching noise in the voice path, and for feeding an alerting signal to a loudspeaker to indicate that the received signal is excessively noisy. The portable transmitter must then be moved or redirected to provide a better line-of-sight signaling path.</description><language>eng</language><subject>ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; TELEPHONIC COMMUNICATION ; TRANSMISSION</subject><creationdate>1980</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=19801014&amp;DB=EPODOC&amp;CC=US&amp;NR=4228320A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25543,76293</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&amp;date=19801014&amp;DB=EPODOC&amp;CC=US&amp;NR=4228320A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>CELLI; JOHN R</creatorcontrib><creatorcontrib>NASH; DONALD H</creatorcontrib><title>Noise detector for frequency modulation systems</title><description>A hands-free telephone system is disclosed utilizing an infrared transmitter and receiver to permit wireless speech transmission. The transmitter uses frequency modulation imposed on the infrared signal and includes carrier shift signaling arrangements for indicating a low battery condition and transmitter turn-off. The receiver utilizes a noise detection circuit for permitting remote turn-on, for squelching noise in the voice path, and for feeding an alerting signal to a loudspeaker to indicate that the received signal is excessively noisy. The portable transmitter must then be moved or redirected to provide a better line-of-sight signaling path.</description><subject>ELECTRIC COMMUNICATION TECHNIQUE</subject><subject>ELECTRICITY</subject><subject>TELEPHONIC COMMUNICATION</subject><subject>TRANSMISSION</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1980</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZND3y88sTlVISS1JTS7JL1JIA-Gi1MLS1LzkSoXc_JTSnMSSzPw8heLK4pLU3GIeBta0xJziVF4ozc0g7-Ya4uyhm1qQH59aXJCYnJqXWhIfGmxiZGRhbGTgaExYBQDB5SrP</recordid><startdate>19801014</startdate><enddate>19801014</enddate><creator>CELLI; JOHN R</creator><creator>NASH; DONALD H</creator><scope>EVB</scope></search><sort><creationdate>19801014</creationdate><title>Noise detector for frequency modulation systems</title><author>CELLI; JOHN R ; NASH; DONALD H</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US4228320A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1980</creationdate><topic>ELECTRIC COMMUNICATION TECHNIQUE</topic><topic>ELECTRICITY</topic><topic>TELEPHONIC COMMUNICATION</topic><topic>TRANSMISSION</topic><toplevel>online_resources</toplevel><creatorcontrib>CELLI; JOHN R</creatorcontrib><creatorcontrib>NASH; DONALD H</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>CELLI; JOHN R</au><au>NASH; DONALD H</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Noise detector for frequency modulation systems</title><date>1980-10-14</date><risdate>1980</risdate><abstract>A hands-free telephone system is disclosed utilizing an infrared transmitter and receiver to permit wireless speech transmission. The transmitter uses frequency modulation imposed on the infrared signal and includes carrier shift signaling arrangements for indicating a low battery condition and transmitter turn-off. The receiver utilizes a noise detection circuit for permitting remote turn-on, for squelching noise in the voice path, and for feeding an alerting signal to a loudspeaker to indicate that the received signal is excessively noisy. The portable transmitter must then be moved or redirected to provide a better line-of-sight signaling path.</abstract><oa>free_for_read</oa></addata></record>
fulltext fulltext_linktorsrc
identifier
ispartof
issn
language eng
recordid cdi_epo_espacenet_US4228320A
source esp@cenet
subjects ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
TRANSMISSION
title Noise detector for frequency modulation systems
url https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-23T15%3A59%3A45IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-epo_EVB&rft_val_fmt=info:ofi/fmt:kev:mtx:patent&rft.genre=patent&rft.au=CELLI;%20JOHN%20R&rft.date=1980-10-14&rft_id=info:doi/&rft_dat=%3Cepo_EVB%3EUS4228320A%3C/epo_EVB%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_id=info:pmid/&rfr_iscdi=true