JPS5596753A - Digital multi-frequency receiving system - Google Patents

Digital multi-frequency receiving system

Info

Publication number
JPS5596753A
JPS5596753A JP334379A JP334379A JPS5596753A JP S5596753 A JPS5596753 A JP S5596753A JP 334379 A JP334379 A JP 334379A JP 334379 A JP334379 A JP 334379A JP S5596753 A JPS5596753 A JP S5596753A
Authority
JP
Japan
Prior art keywords
power
filter
calculators
decision
linear pcm
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
JP334379A
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 JP334379A priority Critical patent/JPS5596753A/en
Publication of JPS5596753A publication Critical patent/JPS5596753A/en
Pending legal-status Critical Current

Links

Landscapes

  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

PURPOSE: To simplify a circuit constitution considerably by measuring the power ratio before and after a cam filter for decision to decide whether a specific frequency exists or not.
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 spectrum inverter INV and low-pass filter LPF. Then, cam filters CF1 and CF2, filters CF1a and CF2a for decision, and power calculators P1∼P4 are provided, and calculators P1 and P2 measure power Pt1 before input of filter CF2a and power Pt2 after output of it respectively. Similarly, calculators P3 and P4 measure power Pt3 before input of filter CF1a and power Pt4 after output of it respectively. Then, it is decided with powers Pt1∼Pt4 and number ZCt1 of zero crossing as data by decision equipment DC1 whether tone signals exist or not.
COPYRIGHT: (C)1980,JPO&Japio
JP334379A 1979-01-18 1979-01-18 Digital multi-frequency receiving system Pending JPS5596753A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP334379A JPS5596753A (en) 1979-01-18 1979-01-18 Digital multi-frequency receiving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP334379A JPS5596753A (en) 1979-01-18 1979-01-18 Digital multi-frequency receiving system

Publications (1)

Publication Number Publication Date
JPS5596753A true JPS5596753A (en) 1980-07-23

Family

ID=11554704

Family Applications (1)

Application Number Title Priority Date Filing Date
JP334379A Pending JPS5596753A (en) 1979-01-18 1979-01-18 Digital multi-frequency receiving system

Country Status (1)

Country Link
JP (1) JPS5596753A (en)

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