GB1108370A - An adjustable attenuating arrangement - Google Patents

An adjustable attenuating arrangement

Info

Publication number
GB1108370A
GB1108370A GB10166A GB10166A GB1108370A GB 1108370 A GB1108370 A GB 1108370A GB 10166 A GB10166 A GB 10166A GB 10166 A GB10166 A GB 10166A GB 1108370 A GB1108370 A GB 1108370A
Authority
GB
United Kingdom
Prior art keywords
attenuators
attenuation
states
coder
decoder
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
GB10166A
Inventor
John Brian Terry
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.)
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
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 Marconi Co Ltd filed Critical Marconi Co Ltd
Priority to GB10166A priority Critical patent/GB1108370A/en
Publication of GB1108370A publication Critical patent/GB1108370A/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
    • H03G7/002—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers
    • H03G7/005—Volume compression or expansion in amplifiers in untuned or low-frequency amplifiers, e.g. audio amplifiers using discontinuously variable devices, e.g. switch-operated
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G7/00—Volume compression or expansion in amplifiers
    • H03G7/007—Volume compression or expansion in amplifiers of digital or coded signals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/24—Frequency- independent attenuators

Abstract

1,108,370. A/D converters. MARCONI CO. Ltd. 26 Oct., 1966 [3 Jan., 1966], No. 101/66. Heading G4H. [Also in Division H3] An adjustable attenuating arrangement for a companded P.C.M. coder or decoder comprises a reference current source 1, attenuators 2 . . . 8 and 14, an inverter 9, and an output load resistance 10. Each of the attenuators 2 ... 8 is switchable by a line 11 between two states of attenuation, one of the states of the attenuators 2, 3, 4 being zero attenuation and one of the states of attenuators 5, 6, 7 being infinite attenuation. The other states of the attenuators 2 ... 7 are <SP>1</SP>/a<SP>4</SP>, <SP>1</SP>/a<SP>2</SP>, 1/a, a, <SP>1</SP>/ 2, <SP>1</SP>/4, where " a " is a constant multiplying factor. If the arrangement is used in a coder, attenuator 8 has one state of infinite attenuation and the other state with an attenuation of <SP>1</SP>/8; whereas for a decoder the two states are <SP>1</SP>/16 and <SP>3</SP>/16 The attenuator 14 has a single attenuation value of <SP>1</SP>/8 for a coder and <SP>1</SP>/16 for a decoder. The inverter 9 controlled by a line 12 changes the sign of the current fed to the resistance 10, if desired, the voltage across the resistance being read out at terminals 15, 16. In use the attenuators 2, 3, 4, 5 are combined in simple combinations to obtain attenuation values lying on a logarithmic curve at points B, C ... H, J (Fig. 2, not shown), these points being in geometrical progression with a multiplication factor of "a." The straight line portions of the curve between adjacent points B, C and C, D &c., may be subdivided into eighths by the attenuators 6, 7, 8.
GB10166A 1966-01-03 1966-01-03 An adjustable attenuating arrangement Expired GB1108370A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB10166A GB1108370A (en) 1966-01-03 1966-01-03 An adjustable attenuating arrangement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10166A GB1108370A (en) 1966-01-03 1966-01-03 An adjustable attenuating arrangement

Publications (1)

Publication Number Publication Date
GB1108370A true GB1108370A (en) 1968-04-03

Family

ID=9698430

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10166A Expired GB1108370A (en) 1966-01-03 1966-01-03 An adjustable attenuating arrangement

Country Status (1)

Country Link
GB (1) GB1108370A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532203A1 (en) * 1991-08-30 1993-03-17 Nec Corporation Power controller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532203A1 (en) * 1991-08-30 1993-03-17 Nec Corporation Power controller
US5334979A (en) * 1991-08-30 1994-08-02 Nec Corporation Power controller

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