JPS5569064A - Testing method for pulsating noise - Google Patents

Testing method for pulsating noise

Info

Publication number
JPS5569064A
JPS5569064A JP14444878A JP14444878A JPS5569064A JP S5569064 A JPS5569064 A JP S5569064A JP 14444878 A JP14444878 A JP 14444878A JP 14444878 A JP14444878 A JP 14444878A JP S5569064 A JPS5569064 A JP S5569064A
Authority
JP
Japan
Prior art keywords
threshold level
pulsating
reference time
instantaneous value
decision
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
JP14444878A
Other languages
Japanese (ja)
Other versions
JPS5855457B2 (en
Inventor
Kazumi Takeda
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP53144448A priority Critical patent/JPS5855457B2/en
Publication of JPS5569064A publication Critical patent/JPS5569064A/en
Publication of JPS5855457B2 publication Critical patent/JPS5855457B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To make a decision close to the sense of hearing by regarding a tested apparatus as a defective when the instantaneous value of an output noise exceeds a threshold level continuously for a fixed time and when it is outputted more than fixed times within a reference time.
CONSTITUTION: The instantaneous value of an output noise from an audio amplifier is denoted vN(t), a smaller value between positive and negative side mean values -vN, and a threshold level for a decision that the output noise is pulsating one k(-vN). When instantaneous value vN(t) exceeds continuously threshold level k(-vN) for reference time τp or longer and when pulsating noises are outputted more than fixed times within reference time Tp from appearance of a 1st pulsating noise, it is decided that a tested apparatus is defective. Here, not only the number of times that noises exceed the threshold level but also their pulse widths are taken into consideration, so that a decision close to the sense of hearing can be made.
COPYRIGHT: (C)1980,JPO&Japio
JP53144448A 1978-11-20 1978-11-20 Pulsed noise test method Expired JPS5855457B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53144448A JPS5855457B2 (en) 1978-11-20 1978-11-20 Pulsed noise test method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53144448A JPS5855457B2 (en) 1978-11-20 1978-11-20 Pulsed noise test method

Publications (2)

Publication Number Publication Date
JPS5569064A true JPS5569064A (en) 1980-05-24
JPS5855457B2 JPS5855457B2 (en) 1983-12-09

Family

ID=15362460

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53144448A Expired JPS5855457B2 (en) 1978-11-20 1978-11-20 Pulsed noise test method

Country Status (1)

Country Link
JP (1) JPS5855457B2 (en)

Also Published As

Publication number Publication date
JPS5855457B2 (en) 1983-12-09

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