JPS56152360A - Voice level automatic control circuit for telephone - Google Patents
Voice level automatic control circuit for telephoneInfo
- Publication number
- JPS56152360A JPS56152360A JP4611381A JP4611381A JPS56152360A JP S56152360 A JPS56152360 A JP S56152360A JP 4611381 A JP4611381 A JP 4611381A JP 4611381 A JP4611381 A JP 4611381A JP S56152360 A JPS56152360 A JP S56152360A
- Authority
- JP
- Japan
- Prior art keywords
- telephone
- control circuit
- automatic control
- voice level
- level automatic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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 |
---|---|
JPS56152360A true JPS56152360A (en) | 1981-11-25 |
JPS6338147B2 JPS6338147B2 (ja) | 1988-07-28 |
Family
ID=9240278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4611381A Granted JPS56152360A (en) | 1980-03-28 | 1981-03-28 | Voice level automatic control circuit for telephone |
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 |
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 |
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 |
EP0388490B1 (en) * | 1989-03-21 | 1994-03-09 | Sony Corporation | Level control circuits |
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 SE SE8101903A patent/SE449811B/sv not_active IP Right Cessation
- 1981-03-25 GB GB8109386A patent/GB2073518B/en not_active Expired
- 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 |
---|---|
FR2479621B1 (fr) | 1988-03-04 |
SE8101903L (sv) | 1981-09-29 |
US4386236A (en) | 1983-05-31 |
SE449811B (sv) | 1987-05-18 |
DE3111845A1 (de) | 1982-01-07 |
JPS6338147B2 (ja) | 1988-07-28 |
FR2479621A1 (fr) | 1981-10-02 |
BE888141A (fr) | 1981-09-28 |
GB2073518A (en) | 1981-10-14 |
CA1171567A (en) | 1984-07-24 |
GB2073518B (en) | 1984-03-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB2107554B (en) | Telephone line circuit | |
GB2077554B (en) | Automatic telephone answering | |
GB2077075B (en) | Automatic telephone answering devices | |
GB2086687B (en) | Automatic video signal level control circuit | |
JPS57101996A (en) | Call indication circuit | |
DE3166355D1 (en) | Tone control circuit | |
JPS56152360A (en) | Voice level automatic control circuit for telephone | |
DE3379857D1 (en) | Automatic level control circuit | |
GB2117600B (en) | Automatic telephone answering device | |
JPS572156A (en) | Voice switch for automatic communication device | |
JPS5787690A (en) | Subscriber circuit | |
GB2117599B (en) | Automatic telephone answering apparatus | |
DK157283A (da) | Fremgangsmaade til toerafsmeltning samt energieffektivt kontinuerligt afsmeltningssystem | |
GB2093255B (en) | Automatic telephone answering apparatus | |
JPS56149092A (en) | Automatic accompaniment circuit | |
JPS5436103A (en) | Automatic answering telephone control circuit | |
DE3161053D1 (en) | Automatic choke | |
GB2152332B (en) | An automatic telephone answering apparatus | |
YU168580A (en) | Electric automatic telephone set | |
AU7410681A (en) | Automatic dialing device | |
GB8328802D0 (en) | Automatic telephone answering apparatus | |
JPS5739833A (en) | Electronic automatic hemadinamometer | |
GB2116401B (en) | Automatic gain control circuit for a subscriber line interface | |
YU44580A (en) | Automatic telephone exchange | |
JPS5785097A (en) | Automatic voice data correction system |