JPS5568712A - Signal level control unit - Google Patents

Signal level control unit

Info

Publication number
JPS5568712A
JPS5568712A JP14259278A JP14259278A JPS5568712A JP S5568712 A JPS5568712 A JP S5568712A JP 14259278 A JP14259278 A JP 14259278A JP 14259278 A JP14259278 A JP 14259278A JP S5568712 A JPS5568712 A JP S5568712A
Authority
JP
Japan
Prior art keywords
counter
attenuation
pulse
turned
switch
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
JP14259278A
Other languages
Japanese (ja)
Inventor
Masao Tomita
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 JP14259278A priority Critical patent/JPS5568712A/en
Priority to US06/091,498 priority patent/US4274117A/en
Priority to GB7938411A priority patent/GB2037106B/en
Publication of JPS5568712A publication Critical patent/JPS5568712A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers

Landscapes

  • Control Of Amplification And Gain Control (AREA)

Abstract

PURPOSE:To realize the level setting featuring a small amount of the inter-channel deviation by installing the signal attenuator groups to each transmission line and then giving the control to the these signal attenuation quantity via the common digital signals. CONSTITUTION:With push of UP-switch, monostable multivibrator 25 is triggered to generate one unit of the pulse. This pulse is supplied to the UP input terminal of counter 23. Thus the UP counting is given to counter 23, output A is turned to H, analog switches 9 and 30 conduct, and the resistance attenuator of the 1st step is set under the attenuation state for resistance attenuator groups 3 and 6 each to give attenuation of, for example, 1dB. Then in case attenuation of, for example, 3dB is given, switch 24 is pushed three times. In this case, three units of the pulse are generated from monostable multivibrator 25 are generated to be applied to the UP input terminal of counter 23. Thus output A and B of counter 23 are turned to H along with output C and D turned to L each. Accordingly, switches 9, 13, 30 and 34 conduct, and the attenuators of 1st and 2nd steps are attenuated to give the attenuatton quantity to the both channels. While DOWN-switch 27 is pushed when the increment of the sound volume is desired.
JP14259278A 1978-11-06 1978-11-17 Signal level control unit Pending JPS5568712A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP14259278A JPS5568712A (en) 1978-11-17 1978-11-17 Signal level control unit
US06/091,498 US4274117A (en) 1978-11-06 1979-11-05 Digital record level setting system
GB7938411A GB2037106B (en) 1978-11-06 1979-11-06 Digital record level setting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14259278A JPS5568712A (en) 1978-11-17 1978-11-17 Signal level control unit

Publications (1)

Publication Number Publication Date
JPS5568712A true JPS5568712A (en) 1980-05-23

Family

ID=15318883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14259278A Pending JPS5568712A (en) 1978-11-06 1978-11-17 Signal level control unit

Country Status (1)

Country Link
JP (1) JPS5568712A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6139711A (en) * 1984-07-31 1986-02-25 Nec Home Electronics Ltd Computer control system
US6876243B2 (en) 1999-11-11 2005-04-05 Broadcom Corporation High linearity large bandwidth, switch insensitive, programmable gain attenuator
US6894558B2 (en) 1999-11-11 2005-05-17 Broadcom Corporation Adjustable bandwidth high pass filter for large input signal, low supply voltage applications
US6967529B2 (en) 1999-11-11 2005-11-22 Broadcom Corporation Large dynamic range programmable gain attenuator
US7038533B2 (en) 1999-11-11 2006-05-02 Broadcom Corporation Gigabit ethernet transceiver with analog front end

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140037A (en) * 1974-04-19 1975-11-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140037A (en) * 1974-04-19 1975-11-10

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6139711A (en) * 1984-07-31 1986-02-25 Nec Home Electronics Ltd Computer control system
JPH0318765B2 (en) * 1984-07-31 1991-03-13 Nippon Denki Hoomu Erekutoronikusu Kk
US6876243B2 (en) 1999-11-11 2005-04-05 Broadcom Corporation High linearity large bandwidth, switch insensitive, programmable gain attenuator
US6894558B2 (en) 1999-11-11 2005-05-17 Broadcom Corporation Adjustable bandwidth high pass filter for large input signal, low supply voltage applications
US6967529B2 (en) 1999-11-11 2005-11-22 Broadcom Corporation Large dynamic range programmable gain attenuator
US7038533B2 (en) 1999-11-11 2006-05-02 Broadcom Corporation Gigabit ethernet transceiver with analog front end
US7053715B2 (en) * 1999-11-11 2006-05-30 Broadcom Corporation Gigabit Ethernet transceiver with analog front end
US7081790B2 (en) 1999-11-11 2006-07-25 Broadcom Corporation Adjustable bandwidth high pass filter for large input signal, low supply voltage applications
US7102428B2 (en) 1999-11-11 2006-09-05 Broadcom Corporation Large dynamic range programmable gain attenuator
US7106122B2 (en) 1999-11-11 2006-09-12 Broadcom Corporation High linearity large bandwidth, switch insensitive, programmable gain attenuator
US7336131B2 (en) * 1999-11-11 2008-02-26 Broadcom Corporation Gigabit ethernet transceiver with analog front end
US7598808B2 (en) 1999-11-11 2009-10-06 Broadcom Corp. Gigabit ethernet transceiver with analog front end
US7671681B2 (en) * 1999-11-11 2010-03-02 Broadcom Corporation Gigabit ethernet transceiver with analog front end
US8841963B2 (en) 1999-11-11 2014-09-23 Broadcom Corporation Gigabit ethernet transceiver with analog front end

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