JPS54111249A - Ctd filter circuit - Google Patents

Ctd filter circuit

Info

Publication number
JPS54111249A
JPS54111249A JP1866478A JP1866478A JPS54111249A JP S54111249 A JPS54111249 A JP S54111249A JP 1866478 A JP1866478 A JP 1866478A JP 1866478 A JP1866478 A JP 1866478A JP S54111249 A JPS54111249 A JP S54111249A
Authority
JP
Japan
Prior art keywords
frequency
filter
fundamental wave
divided
amplitude
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
JP1866478A
Other languages
Japanese (ja)
Inventor
Kunihiro Tanigawa
Yuichiro Ito
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP1866478A priority Critical patent/JPS54111249A/en
Publication of JPS54111249A publication Critical patent/JPS54111249A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H15/00—Transversal filters
    • H03H15/02—Transversal filters using analogue shift registers

Landscapes

  • Filters That Use Time-Delay Elements (AREA)

Abstract

PURPOSE:To obtain a tone decoder by a CTD filter where plural single fequency pass filters different in center frequency are constituted in one filter. CONSTITUTION:Clock 1 is frequency-divided by ''8'' in 2 and is frequency-divided by N in 3 by controlling the N value is 4 and is frequency-divided by ''2'' in 5, and this operation is repeated variably to drive since wave and cosine wave filters 7 and 8 at frequency fc in 6. Since center frequency fi of filters 7 and 8 is set to fci/4, phase components of the fundamental wave of f2 are outputted to differential amplifier 7b of filter 7 in a fc2 driving time and are squared in 9 and are added in 11. Amplitude components ar outputted to diffrential amplifier 8b through filter 8 and are squared in 10 and are added in 11 to obtain signals of the magnitude correspond ing to the amplitude of the fundamental wave of f2. In a fc7 driving time, signals corresponding to the amplitude of the fundamental wave of f7 are obtained. Then, the frequency of the fundamental wave is discriminated from AND between these output signals and output signals of frequency divider 5.
JP1866478A 1978-02-20 1978-02-20 Ctd filter circuit Pending JPS54111249A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1866478A JPS54111249A (en) 1978-02-20 1978-02-20 Ctd filter circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1866478A JPS54111249A (en) 1978-02-20 1978-02-20 Ctd filter circuit

Publications (1)

Publication Number Publication Date
JPS54111249A true JPS54111249A (en) 1979-08-31

Family

ID=11977870

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1866478A Pending JPS54111249A (en) 1978-02-20 1978-02-20 Ctd filter circuit

Country Status (1)

Country Link
JP (1) JPS54111249A (en)

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