JPS5596754A - Digital frequency detection system - Google Patents

Digital frequency detection system

Info

Publication number
JPS5596754A
JPS5596754A JP334479A JP334479A JPS5596754A JP S5596754 A JPS5596754 A JP S5596754A JP 334479 A JP334479 A JP 334479A JP 334479 A JP334479 A JP 334479A JP S5596754 A JPS5596754 A JP S5596754A
Authority
JP
Japan
Prior art keywords
filter
power
linear pcm
cam
frequency
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
JP334479A
Other languages
Japanese (ja)
Inventor
Yotaro Hachitsuka
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.)
KDDI Corp
Original Assignee
Kokusai Denshin Denwa KK
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 Kokusai Denshin Denwa KK filed Critical Kokusai Denshin Denwa KK
Priority to JP334479A priority Critical patent/JPS5596754A/en
Publication of JPS5596754A publication Critical patent/JPS5596754A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To decide whether a tone signal exists or not by causing a digitized signal to pass through a cam filter including a specific frequency or a frequency, which is obtained by converting this specific frequency, at the zero point and by measuring the power ratio before and after the cam filter.
CONSTITUTION: Non-linear PCM signals and linear PCM signals are inputted from terminal 3 and terminal 3a respectively, and the former is converted to a linear PCM signal by expander EXP. Expander EXP is connected to frequency shifter FSH, high-pass filter HPF and cam filter CF1. Power calculator P1 measures power Pt1 before input of cam filter CF1, and power calculator P2 measures power Pt2 after output of filter CF1. Then, it is decided by decision equipment DC1 whether the tone signal exists or not.
COPYRIGHT: (C)1980,JPO&Japio
JP334479A 1979-01-18 1979-01-18 Digital frequency detection system Pending JPS5596754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP334479A JPS5596754A (en) 1979-01-18 1979-01-18 Digital frequency detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP334479A JPS5596754A (en) 1979-01-18 1979-01-18 Digital frequency detection system

Publications (1)

Publication Number Publication Date
JPS5596754A true JPS5596754A (en) 1980-07-23

Family

ID=11554732

Family Applications (1)

Application Number Title Priority Date Filing Date
JP334479A Pending JPS5596754A (en) 1979-01-18 1979-01-18 Digital frequency detection system

Country Status (1)

Country Link
JP (1) JPS5596754A (en)

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