JPS5550709A - Frequency modulator - Google Patents

Frequency modulator

Info

Publication number
JPS5550709A
JPS5550709A JP12260478A JP12260478A JPS5550709A JP S5550709 A JPS5550709 A JP S5550709A JP 12260478 A JP12260478 A JP 12260478A JP 12260478 A JP12260478 A JP 12260478A JP S5550709 A JPS5550709 A JP S5550709A
Authority
JP
Japan
Prior art keywords
1khz
frequency
audio signal
amplitude limiter
modulator
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
JP12260478A
Other languages
Japanese (ja)
Other versions
JPS6047768B2 (en
Inventor
Tsutomu Noda
Kazuhiko Yamazaki
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 JP12260478A priority Critical patent/JPS6047768B2/en
Publication of JPS5550709A publication Critical patent/JPS5550709A/en
Publication of JPS6047768B2 publication Critical patent/JPS6047768B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Transmitters (AREA)
  • Amplitude Modulation (AREA)

Abstract

PURPOSE: To establish the modulator which can reduce the interference, by suppressing the spread of the side band even if the frequency component high in the modulation input is excessive, through the addition of the modulation signals in separate frequency components to the input of the amplitude limiter provided separately.
CONSTITUTION: When the audio signal, e.g., 1kHz or less, from the microphone 1 is inputted, it passed through the HPE11 and is fed to the frequency modulator 6 via the amplitude limiter 4 and LPF13. Further, when the audio signal not less than 1kHz is inputted, it passes through the BPE12 and it is fed to the frequency modulator 6 via the amplitude limiter 15 and LPF14. In this case, assuming that the limit value of the amplitude limiter 15 is 5kHz and that of the limiter 15 is 1kHz with the conversion to the frequency shift, the maximum frequency shift of the audio signal 1kHz or less is 5kHz and that between 1∼3kHz is 1kHz. Thus, to suppress the maximum frequency shift of the frequency component greater in the audio signal, the spread of the side band of the frequency modulation wave can effectively be suppressed and the interference to other receivers can remarkably be reduced.
COPYRIGHT: (C)1980,JPO&Japio
JP12260478A 1978-10-06 1978-10-06 frequency modulator Expired JPS6047768B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12260478A JPS6047768B2 (en) 1978-10-06 1978-10-06 frequency modulator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12260478A JPS6047768B2 (en) 1978-10-06 1978-10-06 frequency modulator

Publications (2)

Publication Number Publication Date
JPS5550709A true JPS5550709A (en) 1980-04-12
JPS6047768B2 JPS6047768B2 (en) 1985-10-23

Family

ID=14840042

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12260478A Expired JPS6047768B2 (en) 1978-10-06 1978-10-06 frequency modulator

Country Status (1)

Country Link
JP (1) JPS6047768B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7758288B2 (en) 2005-01-24 2010-07-20 Shigetoshi Takahashi Expanded hole drilling device and component for the expanded hole drilling device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0551855U (en) * 1991-12-04 1993-07-09 株式会社ファテック Cloth spreading device for patterned fabric

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7758288B2 (en) 2005-01-24 2010-07-20 Shigetoshi Takahashi Expanded hole drilling device and component for the expanded hole drilling device

Also Published As

Publication number Publication date
JPS6047768B2 (en) 1985-10-23

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