JPS5550754A - Detection system of low level identification signal - Google Patents

Detection system of low level identification signal

Info

Publication number
JPS5550754A
JPS5550754A JP12326278A JP12326278A JPS5550754A JP S5550754 A JPS5550754 A JP S5550754A JP 12326278 A JP12326278 A JP 12326278A JP 12326278 A JP12326278 A JP 12326278A JP S5550754 A JPS5550754 A JP S5550754A
Authority
JP
Japan
Prior art keywords
signal
voice
identification signal
sampling
circuit
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
JP12326278A
Other languages
Japanese (ja)
Other versions
JPS6227579B2 (en
Inventor
Toshio Yamamoto
Takakiyo Suzuki
Heiji Okutsu
Tsutomu Nakano
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.)
NIPPON TSUSHINKI KK
Japan Broadcasting Corp
Original Assignee
NIPPON TSUSHINKI KK
Nippon Hoso Kyokai NHK
Japan Broadcasting Corp
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 NIPPON TSUSHINKI KK, Nippon Hoso Kyokai NHK, Japan Broadcasting Corp filed Critical NIPPON TSUSHINKI KK
Priority to JP12326278A priority Critical patent/JPS5550754A/en
Publication of JPS5550754A publication Critical patent/JPS5550754A/en
Publication of JPS6227579B2 publication Critical patent/JPS6227579B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Monitoring And Testing Of Transmission In General (AREA)

Abstract

PURPOSE: To detect the identification signal less in error operation due to the influence of voice signal or noise by convolving a fixed micro-identrification signal to the voice signal, transmitting it, A/D converting and adding and averaging to D/A convert it.
CONSTITUTION: The identification signal of a specific frequency in the voice band is generated by the oscillator. The identification signal is mixed with 2 the voice signal from the voice frequency transmitter A' at a low level and transmitted to the voice signal transmitter B'. The signal from the transmitter B' is distributed 1 by the distributor 3 and one of which is transmitted to the voice signal receiver C' and the other of which, only the frequency component in the vicinity of the identification signal is transmitted to the sampling circuit 6 through BPF. The digital signal subjected to sampling by the sampling oscillator 5 in the circuit 6 and A/D conversion is given to the adding and averaging circuit 8. The circuit 8 comprises a digital adder, a substrator and memory. The voice of the first information and the irregular signal including noises are synchronized with the identification signal and subjected to sampling, adding and averaging to remove the voice and noise, A/D convert this output 9, and detect the low level identification signal.
COPYRIGHT: (C)1980,JPO&Japio
JP12326278A 1978-10-06 1978-10-06 Detection system of low level identification signal Granted JPS5550754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12326278A JPS5550754A (en) 1978-10-06 1978-10-06 Detection system of low level identification signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12326278A JPS5550754A (en) 1978-10-06 1978-10-06 Detection system of low level identification signal

Publications (2)

Publication Number Publication Date
JPS5550754A true JPS5550754A (en) 1980-04-12
JPS6227579B2 JPS6227579B2 (en) 1987-06-16

Family

ID=14856202

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12326278A Granted JPS5550754A (en) 1978-10-06 1978-10-06 Detection system of low level identification signal

Country Status (1)

Country Link
JP (1) JPS5550754A (en)

Also Published As

Publication number Publication date
JPS6227579B2 (en) 1987-06-16

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