JPS5490922A - Delivery system for announcement signal - Google Patents

Delivery system for announcement signal

Info

Publication number
JPS5490922A
JPS5490922A JP15742677A JP15742677A JPS5490922A JP S5490922 A JPS5490922 A JP S5490922A JP 15742677 A JP15742677 A JP 15742677A JP 15742677 A JP15742677 A JP 15742677A JP S5490922 A JPS5490922 A JP S5490922A
Authority
JP
Japan
Prior art keywords
signal
subcarrier
line monitor
main delivery
band
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
JP15742677A
Other languages
Japanese (ja)
Inventor
Takeshi Toyoda
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15742677A priority Critical patent/JPS5490922A/en
Publication of JPS5490922A publication Critical patent/JPS5490922A/en
Pending legal-status Critical Current

Links

Landscapes

  • Monitoring And Testing Of Transmission In General (AREA)
  • Radio Relay Systems (AREA)

Abstract

PURPOSE: To enable to reduce the cross modulation distortion, by using the signal of frequency near the frequency band of the main delivery signal as subcarrier.
CONSTITUTION: Based on the signal of the line monitor pilot signal generator 1, the circuit 5 synthesized to the frequency band near the band upper or lower the band of the main delivery signal, is provided. The subcarrier formed is modulated 3 with the announcement signal and synthesized 5 with the main delivery signal, and it is transmitted with FM modulation 7. On the other hand, at the reception side, the reception signal is FM-demodulated 12, separated 13 into the signal corresponding to the modulation system, and the line monitor pilot signal obtained is performed for synchronizing reproduction. Based on the line monitor pilot signal, the subcarrier signal is reproduced 18, and the announcement signal is obtained with the synchronizing detection 19. Thus, cross modulation distortion can be reduced.
COPYRIGHT: (C)1979,JPO&Japio
JP15742677A 1977-12-28 1977-12-28 Delivery system for announcement signal Pending JPS5490922A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15742677A JPS5490922A (en) 1977-12-28 1977-12-28 Delivery system for announcement signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15742677A JPS5490922A (en) 1977-12-28 1977-12-28 Delivery system for announcement signal

Publications (1)

Publication Number Publication Date
JPS5490922A true JPS5490922A (en) 1979-07-19

Family

ID=15649366

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15742677A Pending JPS5490922A (en) 1977-12-28 1977-12-28 Delivery system for announcement signal

Country Status (1)

Country Link
JP (1) JPS5490922A (en)

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