TW200637342A - De-energized-type constant frequency signal detection method and device - Google Patents

De-energized-type constant frequency signal detection method and device

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Publication number
TW200637342A
TW200637342A TW094110827A TW94110827A TW200637342A TW 200637342 A TW200637342 A TW 200637342A TW 094110827 A TW094110827 A TW 094110827A TW 94110827 A TW94110827 A TW 94110827A TW 200637342 A TW200637342 A TW 200637342A
Authority
TW
Taiwan
Prior art keywords
constant frequency
energized
type constant
detection method
signal detection
Prior art date
Application number
TW094110827A
Other languages
Chinese (zh)
Other versions
TWI262022B (en
Inventor
Zhi-Long Lin
Original Assignee
Tecom 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 Tecom Co Ltd filed Critical Tecom Co Ltd
Priority to TW94110827A priority Critical patent/TWI262022B/en
Application granted granted Critical
Publication of TWI262022B publication Critical patent/TWI262022B/en
Publication of TW200637342A publication Critical patent/TW200637342A/en

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Abstract

The present invention provides a de-energized-type constant frequency signal detection method and device, which uses a notch filter to filter input signals and obtains the average energy of time domain and uses the energy loss of its full frequency band as a threshold to distinguish noises, audio, music, telephone communication and reminder audio signals. Thus, the present invention can be used to produce a rapid and economical de-energized-type constant frequency detection device. Such a device can effectively distinguish audio or constant frequency and has an extremely high error tolerance to signals, as well as high equivalence time domain resolution.
TW94110827A 2005-04-06 2005-04-06 De-energized-type constant frequency signal detection method and device TWI262022B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW94110827A TWI262022B (en) 2005-04-06 2005-04-06 De-energized-type constant frequency signal detection method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW94110827A TWI262022B (en) 2005-04-06 2005-04-06 De-energized-type constant frequency signal detection method and device

Publications (2)

Publication Number Publication Date
TWI262022B TWI262022B (en) 2006-09-11
TW200637342A true TW200637342A (en) 2006-10-16

Family

ID=37987082

Family Applications (1)

Application Number Title Priority Date Filing Date
TW94110827A TWI262022B (en) 2005-04-06 2005-04-06 De-energized-type constant frequency signal detection method and device

Country Status (1)

Country Link
TW (1) TWI262022B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI493917B (en) * 2013-04-29 2015-07-21 Univ Nat Taipei Technology An algorithm for dtmf detection

Also Published As

Publication number Publication date
TWI262022B (en) 2006-09-11

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