JPS5493902A - Tone signal detector circuit - Google Patents

Tone signal detector circuit

Info

Publication number
JPS5493902A
JPS5493902A JP64378A JP64378A JPS5493902A JP S5493902 A JPS5493902 A JP S5493902A JP 64378 A JP64378 A JP 64378A JP 64378 A JP64378 A JP 64378A JP S5493902 A JPS5493902 A JP S5493902A
Authority
JP
Japan
Prior art keywords
pass filter
band
filter
transmitted
detection
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
Application number
JP64378A
Other languages
Japanese (ja)
Other versions
JPS5729118B2 (en
Inventor
Mitsutaka Hosono
Kunio Sasaki
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 JP64378A priority Critical patent/JPS5493902A/en
Publication of JPS5493902A publication Critical patent/JPS5493902A/en
Publication of JPS5729118B2 publication Critical patent/JPS5729118B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
    • H04Q5/02—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with direct connection for all subscribers, i.e. party-line systems
    • H04Q5/08—Signalling by continuous AC
    • H04Q5/10—Signalling by continuous AC using single frequencies for different subscribers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

PURPOSE:To secure an assured detection of the tone signal by giving the negative feedback to the band-pass filter input of one side from the back of the band-pass filter and offsetting the frequency component of one side before the band-pass filter of the desired frequency to each other. CONSTITUTION:The signals transmitted in double frequency parallel of i1 and i2 and piled on the aural signal are transmitted to low pass filter 2 from detector output terminal 1 of the reception part, thus amplifying (3) the double frequency parallel tone frequency of the micro-level. The signals which received limiation through amplitude limit circuit 6 and 11 pass through band-pass filter 7 and 12. Here output i1 of filter 7 is negatively fed back to the intermediate point between resistance 9 and 10 through resistor 16 and 17, and at the same time output i2 of filter 12 is negatively fed back to the intermidiate point between resistance 4 and 5 through resistor 14 and 15 respectively. As a result, only i1 is transmitted as for detector 8 with an ample level margin secured, thus ensuring the stable detection. The same procedure is applied also to the detection of i2.
JP64378A 1978-01-06 1978-01-06 Tone signal detector circuit Granted JPS5493902A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP64378A JPS5493902A (en) 1978-01-06 1978-01-06 Tone signal detector circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP64378A JPS5493902A (en) 1978-01-06 1978-01-06 Tone signal detector circuit

Publications (2)

Publication Number Publication Date
JPS5493902A true JPS5493902A (en) 1979-07-25
JPS5729118B2 JPS5729118B2 (en) 1982-06-21

Family

ID=11479377

Family Applications (1)

Application Number Title Priority Date Filing Date
JP64378A Granted JPS5493902A (en) 1978-01-06 1978-01-06 Tone signal detector circuit

Country Status (1)

Country Link
JP (1) JPS5493902A (en)

Also Published As

Publication number Publication date
JPS5729118B2 (en) 1982-06-21

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