JPS5643822A - Digital control attenuator - Google Patents

Digital control attenuator

Info

Publication number
JPS5643822A
JPS5643822A JP11985879A JP11985879A JPS5643822A JP S5643822 A JPS5643822 A JP S5643822A JP 11985879 A JP11985879 A JP 11985879A JP 11985879 A JP11985879 A JP 11985879A JP S5643822 A JPS5643822 A JP S5643822A
Authority
JP
Japan
Prior art keywords
digital control
attenuator
stages
per step
control attenuator
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.)
Pending
Application number
JP11985879A
Other languages
Japanese (ja)
Inventor
Masaru Uya
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP11985879A priority Critical patent/JPS5643822A/en
Publication of JPS5643822A publication Critical patent/JPS5643822A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00—Networks using active elements
    • H03H11/02—Multiple-port networks
    • H03H11/24—Frequency-independent attenuators

Landscapes

  • Attenuators (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To control the level of an audio signal by decibel steps by damping the value of a digital control signal, used by an attenuator, in proportion to an exponential function. CONSTITUTION:Attenuation degrees of the 1st to 4th stages are K, K<2>, K<4>, and K<8> respectively. The impedance of each stage viewed from its input side has constant value R0 regardless of the on-off states of switches SWSn and SWPn. Therefore, the digital control attenuator having 20logK per step is constituted by calculating resistances RSn and RPn of all stages from damping degree K per step by resistance value R0.
JP11985879A 1979-09-18 1979-09-18 Digital control attenuator Pending JPS5643822A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11985879A JPS5643822A (en) 1979-09-18 1979-09-18 Digital control attenuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11985879A JPS5643822A (en) 1979-09-18 1979-09-18 Digital control attenuator

Publications (1)

Publication Number Publication Date
JPS5643822A true JPS5643822A (en) 1981-04-22

Family

ID=14772008

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11985879A Pending JPS5643822A (en) 1979-09-18 1979-09-18 Digital control attenuator

Country Status (1)

Country Link
JP (1) JPS5643822A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967707A (en) * 1982-10-12 1984-04-17 Matsushita Electric Ind Co Ltd Signal processing circuit
JPS6473396A (en) * 1987-09-14 1989-03-17 Seiko Epson Corp Musical sound generator
JPH07212168A (en) * 1994-01-27 1995-08-11 Nec Eng Ltd Variable attenuator
EP0821477A2 (en) * 1996-07-26 1998-01-28 Sgs-Thomson Microelectronics Gmbh Digitally controllable attenuator circuit for audio

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5967707A (en) * 1982-10-12 1984-04-17 Matsushita Electric Ind Co Ltd Signal processing circuit
JPH0534844B2 (en) * 1982-10-12 1993-05-25 Matsushita Electric Ind Co Ltd
JPS6473396A (en) * 1987-09-14 1989-03-17 Seiko Epson Corp Musical sound generator
JPH07212168A (en) * 1994-01-27 1995-08-11 Nec Eng Ltd Variable attenuator
EP0821477A2 (en) * 1996-07-26 1998-01-28 Sgs-Thomson Microelectronics Gmbh Digitally controllable attenuator circuit for audio
EP0821477A3 (en) * 1996-07-26 1999-08-25 Sgs-Thomson Microelectronics Gmbh Digitally controllable attenuator circuit for audio

Similar Documents

Publication Publication Date Title
GB2074409B (en) Variable load impedance gain-controlled amplifier
JPS5643822A (en) Digital control attenuator
SE8008240L (en) DIGITAL PHONE LINE CIRCUIT AMPLIFIER CONTROL DEVICE
JPS5568712A (en) Signal level control unit
JPS5733311A (en) Ranging system of converter for process
JPS54109749A (en) Switching noise deleting circuit
JPS5617511A (en) Variable attenuating circuit
JPS5755606A (en) Digital control attenuator
JPS5799010A (en) High dynamic range digital agc system
JPS5582521A (en) Attenuator
JPS5620320A (en) Digital frequency control circuit
JPS5779772A (en) Fadar circuit
JPS55120205A (en) Loudness circuit device
JPS5624897A (en) Attenuation quantity set system
JPS57123711A (en) Optical receiving circuit
GB976106A (en) Variolosser networks
JPS5742240A (en) Squeltch circuit
JPS5541044A (en) Tone control circuit
JPS54144854A (en) Controller for signal amount
JPS5643810A (en) Electronic volume
JPS57111123A (en) Signal processing circuit
EP0398039A3 (en) An attenuator circuit
JPS5733816A (en) Step system electronic volume
GB1375030A (en)
GB1505201A (en) Volume control circuit for the variable attenuation of electrical signals