JPS5549092A - Multifrequency signal reception system - Google Patents

Multifrequency signal reception system

Info

Publication number
JPS5549092A
JPS5549092A JP12151778A JP12151778A JPS5549092A JP S5549092 A JPS5549092 A JP S5549092A JP 12151778 A JP12151778 A JP 12151778A JP 12151778 A JP12151778 A JP 12151778A JP S5549092 A JPS5549092 A JP S5549092A
Authority
JP
Japan
Prior art keywords
level
input
discriminators
circuit
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
JP12151778A
Other languages
Japanese (ja)
Inventor
Kazuhiko Takaoka
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12151778A priority Critical patent/JPS5549092A/en
Publication of JPS5549092A publication Critical patent/JPS5549092A/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
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted

Abstract

PURPOSE:To miniaturize a unit by decreasing a out-band signal down to less than a non-operating level by omitting an input filter by controlling the threshold level of a discriminator by the output of a maximum-value detector which detects the largest value among respective frequencies passing through a channel filter. CONSTITUTION:Not less than two signals from input IN are applied at AGC circuit 5, whose output is fed back, thereby outputting an input signal of more than a fixed level as a constant-level signal. The output of this circuit 5 is supplied to channel filters 2-2'', outputs of which are applied to discriminators 3-3''. Further, outputs filters 2-2'' are applied to maximum-value detection circuit 6 and the largest value of them is detected by rectifying a linear alternating-current signal by circuit 6 to generate a threshold voltage equivalent to an input level of a receiver, which is applied to discriminators 3-3'' as a common threshold level of respective discriminators 3-3''. Then, an out-band signal is decreased down to less than a non-operating level to prevent malfunction.
JP12151778A 1978-10-04 1978-10-04 Multifrequency signal reception system Pending JPS5549092A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12151778A JPS5549092A (en) 1978-10-04 1978-10-04 Multifrequency signal reception system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12151778A JPS5549092A (en) 1978-10-04 1978-10-04 Multifrequency signal reception system

Publications (1)

Publication Number Publication Date
JPS5549092A true JPS5549092A (en) 1980-04-08

Family

ID=14813163

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12151778A Pending JPS5549092A (en) 1978-10-04 1978-10-04 Multifrequency signal reception system

Country Status (1)

Country Link
JP (1) JPS5549092A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6164764U (en) * 1984-10-04 1986-05-02

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6164764U (en) * 1984-10-04 1986-05-02

Similar Documents

Publication Publication Date Title
US3823268A (en) Dynamic stereo separation control
US5432854A (en) Stereo FM receiver, noise control circuit therefor
SU976864A3 (en) Amplitude-modulated stereophonic signal receiver
JPS5549092A (en) Multifrequency signal reception system
KR840005289A (en) Protection circuit for AM stereo receiver
JPS5560328A (en) Tuning-point detection circuit of am radio receiver
JPS56116337A (en) Fm receiver
GB1090885A (en) Multifrequency signal receiver circuit
JPS5549093A (en) Multifrequency signal reception system
JPS5528685A (en) Fm stereo radio receiver
JPS55137729A (en) Multiple signal receiver
JPS6417529A (en) Sound multiplex demodulating circuit
JPS575471A (en) Synchronism separator
JPS5593369A (en) Detector for control signal
JPS5741059A (en) Frequency discriminating system
JPS5599885A (en) Receiver for television audio multiplex broadcast
JPS57174957A (en) Multi-path interference rejecting circuit
JPS57180209A (en) Fm signal demodulation system
JPS57147348A (en) Discriminating circuit for two-channel sound broadcast
JPS5714262A (en) Malfunction preventing device for television audio multiplex receiver
JPS6460087A (en) Signal processing circuit
GB1532103A (en) Method and apparatus for translating multiple frequency signalling
JPS5720047A (en) Am stereophonic receiver
JPS5772451A (en) Frequency detection system
JPS57184328A (en) Controller for if signal frequency band width of receiver