JPS5564675A - Measuring method for tape run time - Google Patents

Measuring method for tape run time

Info

Publication number
JPS5564675A
JPS5564675A JP13585378A JP13585378A JPS5564675A JP S5564675 A JPS5564675 A JP S5564675A JP 13585378 A JP13585378 A JP 13585378A JP 13585378 A JP13585378 A JP 13585378A JP S5564675 A JPS5564675 A JP S5564675A
Authority
JP
Japan
Prior art keywords
tape
reel
time
take
run speed
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
JP13585378A
Other languages
Japanese (ja)
Inventor
Yoshinori Okada
Katsuo Mori
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 JP13585378A priority Critical patent/JPS5564675A/en
Priority to US06/090,610 priority patent/US4338645A/en
Publication of JPS5564675A publication Critical patent/JPS5564675A/en
Pending legal-status Critical Current

Links

Landscapes

  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)

Abstract

PURPOSE: To display the remaining time of a VTR tape, etc., without reference to a rapid traverse tape speed, etc., by detecting the tape run speed from a difference in period of continuous double rotation of a take-up reel.
CONSTITUTION: The rotation period of a supply reel or take-up reel is measured twice continuoulsy and a tape run speed is obtained by the expression of measured values Δt(n) and Δt(n+1), and tape thickness D given by v=2πD/[Δt(n+1)- Δt(n)]. This run speed and detection values of rotation angular speeds of the take- up and supply reels are inputted to a microcomputer, so that remaining time T1 of the supply reel can be displayed as not the rotational frequency of the reel but time with good precision. Total tape time T0 may be inputted previously and use time T2 can be displayed as T0-T1=T2.
COPYRIGHT: (C)1980,JPO&Japio
JP13585378A 1978-11-06 1978-11-06 Measuring method for tape run time Pending JPS5564675A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP13585378A JPS5564675A (en) 1978-11-06 1978-11-06 Measuring method for tape run time
US06/090,610 US4338645A (en) 1978-11-06 1979-11-02 Tape running time indication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13585378A JPS5564675A (en) 1978-11-06 1978-11-06 Measuring method for tape run time

Publications (1)

Publication Number Publication Date
JPS5564675A true JPS5564675A (en) 1980-05-15

Family

ID=15161291

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13585378A Pending JPS5564675A (en) 1978-11-06 1978-11-06 Measuring method for tape run time

Country Status (1)

Country Link
JP (1) JPS5564675A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61150178A (en) * 1984-12-24 1986-07-08 Sony Corp Reproducing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS589502A (en) * 1981-07-09 1983-01-19 Mitsubishi Electric Corp Control device in rolling stock

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS589502A (en) * 1981-07-09 1983-01-19 Mitsubishi Electric Corp Control device in rolling stock

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61150178A (en) * 1984-12-24 1986-07-08 Sony Corp Reproducing device

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