BE738074A - - Google Patents
Info
- Publication number
- BE738074A BE738074A BE738074DA BE738074A BE 738074 A BE738074 A BE 738074A BE 738074D A BE738074D A BE 738074DA BE 738074 A BE738074 A BE 738074A
- Authority
- BE
- Belgium
Links
Classifications
-
- 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
- H04M9/10—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic with switching of direction of transmission by voice frequency
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
- Amplifiers (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO336968A NO123134B (de) | 1968-08-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| BE738074A true BE738074A (de) | 1970-02-27 |
Family
ID=19879568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| BE738074D BE738074A (de) | 1968-08-29 | 1969-08-27 |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3660603A (de) |
| BE (1) | BE738074A (de) |
| CH (1) | CH499934A (de) |
| DK (1) | DK132640C (de) |
| FR (1) | FR2016608A1 (de) |
| GB (1) | GB1250380A (de) |
| NL (1) | NL6912967A (de) |
| SE (1) | SE351350B (de) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5242643B2 (de) * | 1973-10-18 | 1977-10-26 | ||
| US4028506A (en) * | 1973-12-12 | 1977-06-07 | Nippon Electric Company, Ltd. | Maximum value tracing circuit for digitized voice signals |
| JPS5411203B2 (de) * | 1974-05-02 | 1979-05-12 | ||
| US3963868A (en) * | 1974-06-27 | 1976-06-15 | Stromberg-Carlson Corporation | Loudspeaking telephone hysteresis and ambient noise control |
| US3970786A (en) * | 1974-06-27 | 1976-07-20 | Stromberg-Carlson Corporation | Loudspeaking telephone with improved receive sensitivity |
| US3953676A (en) * | 1974-12-12 | 1976-04-27 | Northern Electric Company, Limited | Digital control of a loudspeaking telephone system |
| US4025728A (en) * | 1976-01-29 | 1977-05-24 | Sava Jacobson | Speaker telephone |
| US4465902A (en) * | 1982-10-08 | 1984-08-14 | Zenith Electronics Corporation | Digital space phone system |
| US4542263A (en) * | 1984-03-07 | 1985-09-17 | Oki Electric Industry Co., Ltd. | Speech control circuit |
| US4980908A (en) * | 1989-05-30 | 1990-12-25 | Voicetek Corporation | Voice-switched gain control for voice communication equipment connected to telephone lines |
| JPH06338934A (ja) * | 1993-05-25 | 1994-12-06 | Exar Corp | 事象駆動型制御回路を有するスピーカーホーン |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB668858A (en) * | 1949-04-29 | 1952-03-26 | Telephone Mfg Co Ltd | Improvements in and relating to electrical communication systems |
| US3075045A (en) * | 1960-08-29 | 1963-01-22 | Bell Telephone Labor Inc | Speakerphone |
| US3113181A (en) * | 1960-11-25 | 1963-12-03 | Ericsson Telefon Ab L M | Amplifier arrangement |
| DE1281499B (de) * | 1966-03-23 | 1968-10-31 | Siemens Ag | Schaltungsanordnung fuer sprachgesteuerte Freisprechgeraete mit veraenderbarem Daempfungshub |
-
1969
- 1969-08-25 NL NL6912967A patent/NL6912967A/xx unknown
- 1969-08-26 CH CH1294169A patent/CH499934A/de not_active IP Right Cessation
- 1969-08-26 SE SE11821/69A patent/SE351350B/xx unknown
- 1969-08-26 GB GB1250380D patent/GB1250380A/en not_active Expired
- 1969-08-26 DK DK457469A patent/DK132640C/da not_active IP Right Cessation
- 1969-08-27 BE BE738074D patent/BE738074A/xx not_active IP Right Cessation
- 1969-08-28 US US853881A patent/US3660603A/en not_active Expired - Lifetime
- 1969-08-29 FR FR6929630A patent/FR2016608A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| SE351350B (de) | 1972-11-20 |
| DK132640C (da) | 1976-06-08 |
| GB1250380A (de) | 1971-10-20 |
| US3660603A (en) | 1972-05-02 |
| FR2016608A1 (de) | 1970-05-08 |
| CH499934A (de) | 1970-11-30 |
| DE1942814A1 (de) | 1970-05-06 |
| DE1942814B2 (de) | 1976-10-14 |
| NL6912967A (de) | 1970-03-03 |
| DK132640B (da) | 1976-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| RE20 | Patent expired |
Owner name: N.V. PHILIPS GLOEILAMPENFABRIEKEN Effective date: 19890827 |