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
Links
- 238000001914 filtration Methods 0.000 title 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 abstract 1
Landscapes
- 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)
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) |
-
1992
- 1992-12-10 IT ITMI922798A patent/IT1256473B/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
ITMI922798A1 (en) | 1994-06-10 |
ITMI922798A0 (en) | 1992-12-10 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN109151680A (en) | Electronic equipment | |
DE60304578D1 (en) | RECTANGULAR CONVERTER WITH A MAGNET | |
DE69503493D1 (en) | MODULAR HIGH TONE SPEAKER | |
US5978491A (en) | Circuitry for improving performance of electret microphone | |
US7580735B2 (en) | Condenser microphone | |
IT1256473B (en) | USER TELEPHONE EQUIPMENT WITH ELECTRONIC MICROPHONE, WITH FILTERING CIRCUIT FOR RADIO FREQUENCY DISORDERS. | |
CN204633989U (en) | Earphone socket and electronic equipment | |
KR850002188A (en) | cellphone | |
CN106817644A (en) | A kind of mobile terminal and head circuit | |
US7646865B2 (en) | Telephone handset coupling system | |
CN208905216U (en) | Voice coil has the thin speaker for playing wave energy | |
CN215991190U (en) | High noise suppression audio signal transmission circuit | |
CN205596334U (en) | Loudspeaker | |
CN201150126Y (en) | Loudspeaker accessory circuit | |
CN206743487U (en) | A kind of mobile terminal and head circuit | |
CN219893445U (en) | Signal amplitude limiting mute circuit and audio equipment | |
CN216752086U (en) | Novel regular quadrilateral voice coil | |
CN214256591U (en) | Sensor package | |
CN1290114A (en) | Microphone circuit with high noise resistance | |
JPH04605Y2 (en) | ||
KR200208080Y1 (en) | Noise reduction structure of built-in type ear microphone | |
TW474085B (en) | Impedance blocking filter circuit | |
CN115643333A (en) | Loudspeaker assembly and mobile terminal | |
US3197571A (en) | Signalling circuits | |
CN2153913Y (en) | Ringing sound volume automatic increasing type telephone set |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
0001 | Granted | ||
TA | Fee payment date (situation as of event date), data collected since 19931001 |
Effective date: 19951206 |