JPS5789366A - Multifrequency signal detection system - Google Patents

Multifrequency signal detection system

Info

Publication number
JPS5789366A
JPS5789366A JP55166160A JP16616080A JPS5789366A JP S5789366 A JPS5789366 A JP S5789366A JP 55166160 A JP55166160 A JP 55166160A JP 16616080 A JP16616080 A JP 16616080A JP S5789366 A JPS5789366 A JP S5789366A
Authority
JP
Japan
Prior art keywords
outputs
weighting function
sine wave
operating circuit
input signal
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
JP55166160A
Other languages
Japanese (ja)
Inventor
Haruyuki Yoshino
Atsushi Aiiso
Kenzo Hasegawa
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 JP55166160A priority Critical patent/JPS5789366A/en
Publication of JPS5789366A publication Critical patent/JPS5789366A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE:To detect a multifrequency signal without using many filters, by providing a sine wave weighting function and a cosine wave weighting function for every predetermined frequency and by using a filter in time division multiplexing. CONSTITUTION:The signal received from an input IN is sampled at a constant period by a sampling circuit SP and is weighted in accordance with respective frequencies by a sine wave operating circuit S and a cosine wave operating circuit C. For outputs D1a-DPa and D1b-DPb, averages outputs D1-DP due to the square sum are obtained by averaging circuits W1-WP respectively. Since only output signals corresponding to frequencies included in the input signal become high-level in these outputs D1-DP, frequency components of the input signal are detected on a basis of outputs from which high-level signals are obtained.
JP55166160A 1980-11-26 1980-11-26 Multifrequency signal detection system Pending JPS5789366A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55166160A JPS5789366A (en) 1980-11-26 1980-11-26 Multifrequency signal detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55166160A JPS5789366A (en) 1980-11-26 1980-11-26 Multifrequency signal detection system

Publications (1)

Publication Number Publication Date
JPS5789366A true JPS5789366A (en) 1982-06-03

Family

ID=15826175

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55166160A Pending JPS5789366A (en) 1980-11-26 1980-11-26 Multifrequency signal detection system

Country Status (1)

Country Link
JP (1) JPS5789366A (en)

Similar Documents

Publication Publication Date Title
DK0565672T3 (en) Method of detecting a switch tone signal for an echo equalizer
SE7901642L (en) DIGITAL MULTIFREQUENCY SIGNAL RECEIVER SYSTEM
JPS5789366A (en) Multifrequency signal detection system
SU469095A1 (en) Device for measuring the parameters of a quasi-monochromatic signal
RU1810835C (en) Frequency meter
SU1081642A1 (en) Device for multiplying low-frequency signals
SU907458A1 (en) Spectral analysis device
SU476520A1 (en) Repetitive Spectrum Analyzer
SU458104A1 (en) Device for multi-channel reception of binary signals of frequency code
GB1206369A (en) An improved wave analyser
JPS5795746A (en) Receiver for multifrequency signal
JPS5735402A (en) Frequency discriminating device
JPS56100592A (en) Multichannel remote control system
JPS5630336A (en) Multipath detecting method
JPS5791457A (en) Frequency analyzer
SU705962A1 (en) Narrowband jamming device
JPS56153871A (en) Receiving system for signal-frequency signal
JPS5772451A (en) Frequency detection system
JPS57143965A (en) Multifrequency signal receiver
JPS5721128A (en) Switching circuit
JPS5651147A (en) Turn-on sequence detecting circuit
JPS5395674A (en) High sensitivity signal detection system
JPS57152235A (en) Fm modulation and demodulation system
JPS53110308A (en) Multi-frequency signal receiving system
JPS577646A (en) Display device for operation of unnecessary noise eliminating function