IT987330B - Generatore elettrico acustico specie per impianti telefonici - Google Patents
Generatore elettrico acustico specie per impianti telefoniciInfo
- Publication number
- IT987330B IT987330B IT23806/73A IT2380673A IT987330B IT 987330 B IT987330 B IT 987330B IT 23806/73 A IT23806/73 A IT 23806/73A IT 2380673 A IT2380673 A IT 2380673A IT 987330 B IT987330 B IT 987330B
- Authority
- IT
- Italy
- Prior art keywords
- telephone systems
- acoustic generator
- electric acoustic
- species
- generator species
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for telephonic receivers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Telephone Set Structure (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722223531 DE2223531B1 (de) | 1972-05-15 | 1972-05-15 | Elektroakustischer wandler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IT987330B true IT987330B (it) | 1975-02-20 |
Family
ID=5844876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IT23806/73A IT987330B (it) | 1972-05-15 | 1973-05-08 | Generatore elettrico acustico specie per impianti telefonici |
Country Status (15)
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5744397Y2 (US08197722-20120612-C00093.png) * | 1977-05-11 | 1982-09-30 | ||
| DE2831377A1 (de) * | 1978-07-17 | 1980-01-31 | Siemens Ag | Elektroakustischer wandler |
| CH642503A5 (en) * | 1979-08-02 | 1984-04-13 | Landis & Gyr Ag | Ultrasound converter |
| DE2937922A1 (de) * | 1979-09-19 | 1981-04-09 | Siemens AG, 1000 Berlin und 8000 München | Piezoelektrischer wandler |
| JPS5791100A (en) * | 1980-11-27 | 1982-06-07 | Nippon Telegr & Teleph Corp <Ntt> | Ceramic piezoelectric type receiver |
| DE3446183A1 (de) * | 1984-12-18 | 1986-06-26 | Siemens AG, 1000 Berlin und 8000 München | Piezoelektrischer wandler |
| GB2168875A (en) * | 1984-12-19 | 1986-06-25 | Philips Electronic Associated | Electroacoustic calling device |
| JPS62188459A (ja) * | 1986-02-13 | 1987-08-18 | Matsushita Electric Ind Co Ltd | スピ−カ内蔵型電話機 |
| DE102006028212A1 (de) * | 2006-06-14 | 2007-12-20 | Valeo Schalter Und Sensoren Gmbh | Ultraschallsensor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1646628A (en) * | 1927-10-25 | James g | ||
| DE410304C (de) * | 1920-09-28 | 1925-03-16 | Signal Ges M B H | Akustischer Apparat fuer Fernsprechzwecke mit zwei oder mehreren abgestimmten, miteinander gekoppelten selbstaendigen Schwingungsgebilden |
| DK35869C (da) * | 1924-10-16 | 1926-04-12 | Hans Christian Skaarup | Ørestykke til Telefoner og lignende Apparater. |
| FR715926A (fr) * | 1930-04-25 | 1931-12-11 | Pintsch Julius Ag | Ouverture variable d'émetteur de son |
| US2236568A (en) * | 1939-07-29 | 1941-04-01 | Bell Telephone Labor Inc | Receiver cap acoustic filter |
| DE1188657B (de) * | 1962-04-27 | 1965-03-11 | Siemens Ag | Anordnung zur Frequenzgangverbesserung eines elektroakustischen Wandlers |
| CH528197A (de) * | 1971-12-20 | 1972-09-15 | Ibm | Gehäuseanordnung mit einem elektro-akustischen Wandler, und Verwendung derselben in einem Telefonapparat einer Nachrichtenübertragungsanlage mit PCM-Codierung |
-
1972
- 1972-05-15 DE DE19722223531 patent/DE2223531B1/de not_active Withdrawn
-
1973
- 1973-03-16 CH CH384173A patent/CH565495A5/xx not_active IP Right Cessation
- 1973-03-29 AR AR247312A patent/AR193949A1/es active
- 1973-04-02 AT AT288273A patent/AT327300B/de not_active IP Right Cessation
- 1973-04-18 GB GB1867773A patent/GB1434056A/en not_active Expired
- 1973-04-19 NL NL7305600A patent/NL7305600A/xx not_active Application Discontinuation
- 1973-05-07 ZA ZA733081A patent/ZA733081B/xx unknown
- 1973-05-08 IT IT23806/73A patent/IT987330B/it active
- 1973-05-10 FR FR7316919A patent/FR2184681B1/fr not_active Expired
- 1973-05-14 LU LU67591A patent/LU67591A1/xx unknown
- 1973-05-14 BR BR3497/73A patent/BR7303497D0/pt unknown
- 1973-05-15 SE SE7306885A patent/SE383244B/xx unknown
- 1973-05-15 BE BE131125A patent/BE799551A/xx unknown
- 1973-05-15 JP JP48054024A patent/JPS5123841B2/ja not_active Expired
-
1976
- 1976-03-22 US US05/669,162 patent/US4027115A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2184681A1 (US08197722-20120612-C00093.png) | 1973-12-28 |
| AT327300B (de) | 1976-01-26 |
| DE2223531A1 (US08197722-20120612-C00093.png) | 1973-11-08 |
| JPS4950918A (US08197722-20120612-C00093.png) | 1974-05-17 |
| AR193949A1 (es) | 1973-05-31 |
| FR2184681B1 (US08197722-20120612-C00093.png) | 1979-05-04 |
| BE799551A (fr) | 1973-11-16 |
| US4027115A (en) | 1977-05-31 |
| SE383244B (sv) | 1976-03-01 |
| BR7303497D0 (pt) | 1974-07-11 |
| LU67591A1 (US08197722-20120612-C00093.png) | 1973-07-24 |
| CH565495A5 (US08197722-20120612-C00093.png) | 1975-08-15 |
| JPS5123841B2 (US08197722-20120612-C00093.png) | 1976-07-20 |
| GB1434056A (en) | 1976-04-28 |
| ZA733081B (en) | 1974-04-24 |
| ATA288273A (de) | 1975-04-15 |
| NL7305600A (US08197722-20120612-C00093.png) | 1973-11-19 |
| DE2223531B1 (de) | 1973-11-08 |
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