SE449811B - Hogtalande telefonapparat med en reglerbar dempningskrets for den mottagna ljudsignalen - Google Patents
Hogtalande telefonapparat med en reglerbar dempningskrets for den mottagna ljudsignalenInfo
- Publication number
- SE449811B SE449811B SE8101903A SE8101903A SE449811B SE 449811 B SE449811 B SE 449811B SE 8101903 A SE8101903 A SE 8101903A SE 8101903 A SE8101903 A SE 8101903A SE 449811 B SE449811 B SE 449811B
- Authority
- SE
- Sweden
- Prior art keywords
- signal
- pulses
- current
- circuit
- capacitor
- Prior art date
Links
- 230000005236 sound signal Effects 0.000 title claims description 24
- 239000003990 capacitor Substances 0.000 claims description 38
- 230000006835 compression Effects 0.000 claims description 18
- 238000007906 compression Methods 0.000 claims description 18
- 230000002238 attenuated effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 37
- 230000003247 decreasing effect Effects 0.000 description 8
- 230000000295 complement effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 230000003071 parasitic effect Effects 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
- Control Of Amplification And Gain Control (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8007055A FR2479621B1 (fr) | 1980-03-28 | 1980-03-28 | Dispositif de regulation automatique du niveau d'ecoute d'un poste telephonique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE8101903L SE8101903L (sv) | 1981-09-29 |
| SE449811B true SE449811B (sv) | 1987-05-18 |
Family
ID=9240278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8101903A SE449811B (sv) | 1980-03-28 | 1981-03-25 | Hogtalande telefonapparat med en reglerbar dempningskrets for den mottagna ljudsignalen |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4386236A (ja) |
| JP (1) | JPS56152360A (ja) |
| BE (1) | BE888141A (ja) |
| CA (1) | CA1171567A (ja) |
| DE (1) | DE3111845A1 (ja) |
| FR (1) | FR2479621B1 (ja) |
| GB (1) | GB2073518B (ja) |
| SE (1) | SE449811B (ja) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2569322B1 (fr) * | 1984-08-17 | 1986-12-05 | Trt Telecom Radio Electr | Annuleur d'echo utilisant la modulation delta |
| CA1222293A (en) * | 1985-02-13 | 1987-05-26 | David L. Lynch | Automatic linear compression circuit |
| DE3509658A1 (de) * | 1985-03-18 | 1986-09-18 | Drägerwerk AG, 2400 Lübeck | Kommunikationseinheit fuer eine hoer-/sprecheinrichtung |
| US4928307A (en) * | 1989-03-02 | 1990-05-22 | Acs Communications | Time dependent, variable amplitude threshold output circuit for frequency variant and frequency invariant signal discrimination |
| US5070527A (en) * | 1989-03-02 | 1991-12-03 | Acs Communications, Inc. | Time dependant, variable amplitude threshold output circuit for frequency variant and frequency invarient signal discrimination |
| DE68913721T2 (de) * | 1989-03-21 | 1994-09-29 | Sony Corp | Pegelsteuerungsschaltung. |
| US5495408A (en) * | 1992-06-10 | 1996-02-27 | Rockwell International Corporation | Method and apparatus for signal tracking using feedback control loop |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1164281A (en) * | 1965-09-18 | 1969-09-17 | Emi Ltd | Improvements in or relating to Telephone User's Local Apparatus. |
| DE1962017A1 (de) * | 1969-12-11 | 1971-06-16 | Plessey Co Ltd | Impulsbreitenmodulationsanordnung |
| DE2161657C2 (de) * | 1971-12-11 | 1982-10-14 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Regeleinrichtung |
| US3911363A (en) * | 1974-12-09 | 1975-10-07 | Ibm | Delta modulation circuitry with automatic squelch and gain control |
-
1980
- 1980-03-28 FR FR8007055A patent/FR2479621B1/fr not_active Expired
-
1981
- 1981-03-16 US US06/244,359 patent/US4386236A/en not_active Expired - Fee Related
- 1981-03-19 CA CA000373433A patent/CA1171567A/en not_active Expired
- 1981-03-25 GB GB8109386A patent/GB2073518B/en not_active Expired
- 1981-03-25 SE SE8101903A patent/SE449811B/sv not_active IP Right Cessation
- 1981-03-26 DE DE19813111845 patent/DE3111845A1/de not_active Withdrawn
- 1981-03-26 BE BE0/204276A patent/BE888141A/fr not_active IP Right Cessation
- 1981-03-28 JP JP4611381A patent/JPS56152360A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| CA1171567A (en) | 1984-07-24 |
| BE888141A (fr) | 1981-09-28 |
| GB2073518A (en) | 1981-10-14 |
| FR2479621A1 (fr) | 1981-10-02 |
| JPS56152360A (en) | 1981-11-25 |
| JPS6338147B2 (ja) | 1988-07-28 |
| FR2479621B1 (fr) | 1988-03-04 |
| US4386236A (en) | 1983-05-31 |
| DE3111845A1 (de) | 1982-01-07 |
| GB2073518B (en) | 1984-03-28 |
| SE8101903L (sv) | 1981-09-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
Ref document number: 8101903-6 Effective date: 19890426 Format of ref document f/p: F |