IT1256473B - USER TELEPHONE EQUIPMENT WITH ELECTRONIC MICROPHONE, WITH FILTERING CIRCUIT FOR RADIO FREQUENCY DISORDERS. - Google Patents

USER TELEPHONE EQUIPMENT WITH ELECTRONIC MICROPHONE, WITH FILTERING CIRCUIT FOR RADIO FREQUENCY DISORDERS.

Info

Publication number
IT1256473B
IT1256473B ITMI922798A ITMI922798A IT1256473B IT 1256473 B IT1256473 B IT 1256473B IT MI922798 A ITMI922798 A IT MI922798A IT MI922798 A ITMI922798 A IT MI922798A IT 1256473 B IT1256473 B IT 1256473B
Authority
IT
Italy
Prior art keywords
user telephone
radio frequency
filtering circuit
microphone
telephone equipment
Prior art date
Application number
ITMI922798A
Other languages
Italian (it)
Inventor
Dario Scarano
Original Assignee
Italtel Telematica
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Italtel Telematica filed Critical Italtel Telematica
Priority to ITMI922798A priority Critical patent/IT1256473B/en
Publication of ITMI922798A0 publication Critical patent/ITMI922798A0/en
Publication of ITMI922798A1 publication Critical patent/ITMI922798A1/en
Application granted granted Critical
Publication of IT1256473B publication Critical patent/IT1256473B/en

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  • Telephone Set Structure (AREA)

Abstract

Apparecchio telefonico di utente con microfono ad elettrete, comprendente un microtelefono (11) con altoparlante (13) e microfono ad elettrete (14) collegati mediante un cordone (15) con fili conduttori (16, 17, 18, 19) ad una basetta ospitante un'interfaccia di linea, un impulsatore ed un circuito di fonia, in cui tale microfono ad elettrete (14) è collegato ai fili conduttori tramite un circuito di filtraggio (30) comprendente un condensatore (32) in parallelo al microfono (14), e una bobina (31), costituita da due avvolgimenti simmetrici (31A, 31B) avvolti su di un nucleo di ferrite (34) ed elettricamente collegati in opposizione, in serie a tale microfono ad elettrete (14). (Fig. 2)User telephone set with electret microphone, comprising a handset (11) with loudspeaker (13) and electret microphone (14) connected by a cord (15) with conducting wires (16, 17, 18, 19) to a host base a line interface, an impeller and a voice circuit, in which this electret microphone (14) is connected to the conductive wires by means of a filter circuit (30) comprising a capacitor (32) parallel to the microphone (14), and a coil (31), consisting of two symmetrical windings (31A, 31B) wound on a ferrite core (34) and electrically connected in opposition, in series with this electret microphone (14). (Fig. 2)

ITMI922798A 1992-12-10 1992-12-10 USER TELEPHONE EQUIPMENT WITH ELECTRONIC MICROPHONE, WITH FILTERING CIRCUIT FOR RADIO FREQUENCY DISORDERS. IT1256473B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
ITMI922798A IT1256473B (en) 1992-12-10 1992-12-10 USER TELEPHONE EQUIPMENT WITH ELECTRONIC MICROPHONE, WITH FILTERING CIRCUIT FOR RADIO FREQUENCY DISORDERS.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI922798A IT1256473B (en) 1992-12-10 1992-12-10 USER TELEPHONE EQUIPMENT WITH ELECTRONIC MICROPHONE, WITH FILTERING CIRCUIT FOR RADIO FREQUENCY DISORDERS.

Publications (3)

Publication Number Publication Date
ITMI922798A0 ITMI922798A0 (en) 1992-12-10
ITMI922798A1 ITMI922798A1 (en) 1994-06-10
IT1256473B true IT1256473B (en) 1995-12-07

Family

ID=11364423

Family Applications (1)

Application Number Title Priority Date Filing Date
ITMI922798A IT1256473B (en) 1992-12-10 1992-12-10 USER TELEPHONE EQUIPMENT WITH ELECTRONIC MICROPHONE, WITH FILTERING CIRCUIT FOR RADIO FREQUENCY DISORDERS.

Country Status (1)

Country Link
IT (1) IT1256473B (en)

Also Published As

Publication number Publication date
ITMI922798A1 (en) 1994-06-10
ITMI922798A0 (en) 1992-12-10

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Legal Events

Date Code Title Description
0001 Granted
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19951206