IT1139078B - Circuito di sottostazione ad altoparlante perfezionato - Google Patents
Circuito di sottostazione ad altoparlante perfezionatoInfo
- Publication number
- IT1139078B IT1139078B IT20955/81A IT2095581A IT1139078B IT 1139078 B IT1139078 B IT 1139078B IT 20955/81 A IT20955/81 A IT 20955/81A IT 2095581 A IT2095581 A IT 2095581A IT 1139078 B IT1139078 B IT 1139078B
- Authority
- IT
- Italy
- Prior art keywords
- perfected
- speaker
- substation circuit
- substation
- circuit
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
- H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/137,702 US4309573A (en) | 1980-04-07 | 1980-04-07 | Loudspeaking substation circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
IT8120955A0 IT8120955A0 (it) | 1981-04-06 |
IT1139078B true IT1139078B (it) | 1986-09-17 |
Family
ID=22478687
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IT20955/81A IT1139078B (it) | 1980-04-07 | 1981-04-06 | Circuito di sottostazione ad altoparlante perfezionato |
Country Status (4)
Country | Link |
---|---|
US (1) | US4309573A (it) |
BE (1) | BE886978A (it) |
CA (1) | CA1149091A (it) |
IT (1) | IT1139078B (it) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL8200666A (nl) * | 1982-02-19 | 1983-09-16 | Philips Nv | Transmissieschakeling voor een elektronisch telefoontoestel. |
US4554411A (en) * | 1983-01-24 | 1985-11-19 | Scovill Inc. | Intercom system |
JPS63234654A (ja) * | 1987-03-24 | 1988-09-29 | Toshiba Corp | 無線電話装置 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1303244A (it) * | 1969-05-15 | 1973-01-17 | ||
US3881069A (en) * | 1973-04-05 | 1975-04-29 | Nitsuko Ltd | Telephone call loudspeaker monitoring and relay control circuit |
-
1980
- 1980-04-07 US US06/137,702 patent/US4309573A/en not_active Expired - Lifetime
-
1981
- 1981-01-07 BE BE2/58938A patent/BE886978A/fr not_active IP Right Cessation
- 1981-03-10 CA CA000372647A patent/CA1149091A/en not_active Expired
- 1981-04-06 IT IT20955/81A patent/IT1139078B/it active
Also Published As
Publication number | Publication date |
---|---|
CA1149091A (en) | 1983-06-28 |
IT8120955A0 (it) | 1981-04-06 |
BE886978A (fr) | 1981-05-04 |
US4309573A (en) | 1982-01-05 |
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