GB445977A - Improvements in or relating to attenuation controlling electrical networks - Google Patents

Improvements in or relating to attenuation controlling electrical networks

Info

Publication number
GB445977A
GB445977A GB9273/35A GB927335A GB445977A GB 445977 A GB445977 A GB 445977A GB 9273/35 A GB9273/35 A GB 9273/35A GB 927335 A GB927335 A GB 927335A GB 445977 A GB445977 A GB 445977A
Authority
GB
United Kingdom
Prior art keywords
filament
control
march
employed
temperature coefficient
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.)
Expired
Application number
GB9273/35A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens and Halske AG
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens and Halske AG, Siemens AG filed Critical Siemens and Halske AG
Publication of GB445977A publication Critical patent/GB445977A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/001—Volume compression or expansion in amplifiers without controlling loop
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
    • H03G11/004—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general using discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers
    • H03G7/004—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers using continuously variable impedance devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/02—Volume compression or expansion in amplifiers having discharge tubes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
    • H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
    • H03G9/04—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes
    • H03G9/10—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for tone control and volume expansion or compression
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising
    • H04B3/10—Control of transmission; Equalising by pilot signal

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Networks Using Active Elements (AREA)
  • Amplifiers (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Adjustable Resistors (AREA)

Abstract

445,977. Automatic volume control. SIEMENS & HALSKE AKT.-GES., Siemensstadt, Berlin. March 25, 1935, No. 9273. Convention date, March 23, 1934. [Class 40 (iv)] [See also Group XL] A volume-regulating resistance network comprises an element having a negative temperature coefficient and consisting of a filament of uranium dioxide in vacuo to which a control voltage is applied. Fig. 1 shows the application of the invention to an automatic volume controlling system in which a control frequency is filtered from the output of an amplifier V, rectified and made to control the current through and therefore the value of the resistance of the filament R- which forms an element in a potential divider. Fig. 2 shows a filament of uranium dioxide as a shunt element in a four-terminal network. Several such networks may be employed in tandem. The Specification as open to inspection under Sect. 91 comprises also arrangements in which a variable element such as an incandescent lamp having a positive temperature coefficient is employed. In one of these, Fig. 2 (Cancelled), an increase in signal strength causes a reduction in the current through the variable element. The others are similar to the arrangements shown in Figs. 1 and 2, except that the fixed and variable elements are transposed as regards the main transmission path. These systems are not included in the Specification as accepted.
GB9273/35A 1934-03-23 1935-03-25 Improvements in or relating to attenuation controlling electrical networks Expired GB445977A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES113374D DE727190C (en) 1934-03-23 1934-03-23 Circuit arrangement for regulating the transmission rate of transmission systems with the aid of regulating resistors

Publications (1)

Publication Number Publication Date
GB445977A true GB445977A (en) 1936-04-22

Family

ID=7532467

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9273/35A Expired GB445977A (en) 1934-03-23 1935-03-25 Improvements in or relating to attenuation controlling electrical networks

Country Status (4)

Country Link
US (1) US2129074A (en)
AT (2) AT146911B (en)
DE (1) DE727190C (en)
GB (1) GB445977A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7406698A (en) * 1973-05-17 1974-11-19

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1069690B (en) * 1959-11-26
US2428039A (en) * 1942-06-20 1947-09-30 Standard Telephones Cables Ltd Feedback amplifier
US3048791A (en) * 1943-06-22 1962-08-07 Sheldon H Dike Amplifier which changes its frequency response with time
US2554153A (en) * 1948-04-14 1951-05-22 Bell Telephone Labor Inc Telephotograph system, including a pilot gain control channel
DE1046106B (en) * 1953-02-11 1958-12-11 Siemens Ag Method for avoiding disturbances occurring in multi-channel carrier frequency systems, in particular from overdriving phenomena in the carrier frequency intermediate amplifiers
DE1016760B (en) * 1953-07-07 1957-10-03 Deutsche Bundespost Circuit arrangement for volume control in telephone subscriber connection lines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7406698A (en) * 1973-05-17 1974-11-19

Also Published As

Publication number Publication date
AT146911B (en) 1936-09-10
DE727190C (en) 1942-10-29
AT155197B (en) 1938-12-10
US2129074A (en) 1938-09-06

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