JPS5570979A - Display unit for tape running time - Google Patents

Display unit for tape running time

Info

Publication number
JPS5570979A
JPS5570979A JP14343678A JP14343678A JPS5570979A JP S5570979 A JPS5570979 A JP S5570979A JP 14343678 A JP14343678 A JP 14343678A JP 14343678 A JP14343678 A JP 14343678A JP S5570979 A JPS5570979 A JP S5570979A
Authority
JP
Japan
Prior art keywords
tape running
running time
time
adder
circuit
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
JP14343678A
Other languages
Japanese (ja)
Inventor
Masamichi Yamada
Toru Sanbe
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 JP14343678A priority Critical patent/JPS5570979A/en
Publication of JPS5570979A publication Critical patent/JPS5570979A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To accurately display the tape running time or residual time, by operating the tape running time or residual time from the ratio of angular velocity at winding and supply side and providing a clock.
CONSTITUTION: The adder and substrator 17b is provided, which connects the operation circuits 16a, and 16b, adder and subtractor 17a, and time pulse generation circuit 20 between the photo detection element 9 and the display circuit 23 located opposingly with the light emitting element 8 to the slit discs 1, 2 directly coupled to the winding and supply reel, via the gate circuit 14c. Thus, after the pulse signal produced at the photo detection element 9 is amplified and wave shaped, it is the gate control signal and the logical product with the reference signal is taken, then it is counted and inputted to the operation circuit 16a. After calculating the ratio of angular velocity β, the tape running time T is calculated at the operator 16b via the correction constants A and B from the adder and subtractor 17a inputting the comparison value between the difference of the tape running time T and the tape running time memory value and the reference time, and it is displayed.
COPYRIGHT: (C)1980,JPO&Japio
JP14343678A 1978-11-22 1978-11-22 Display unit for tape running time Pending JPS5570979A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14343678A JPS5570979A (en) 1978-11-22 1978-11-22 Display unit for tape running time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14343678A JPS5570979A (en) 1978-11-22 1978-11-22 Display unit for tape running time

Publications (1)

Publication Number Publication Date
JPS5570979A true JPS5570979A (en) 1980-05-28

Family

ID=15338657

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14343678A Pending JPS5570979A (en) 1978-11-22 1978-11-22 Display unit for tape running time

Country Status (1)

Country Link
JP (1) JPS5570979A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57105873A (en) * 1980-12-19 1982-07-01 Matsushita Electric Ind Co Ltd Magnetic recording and playback device
JPS57143772A (en) * 1981-02-27 1982-09-06 Pioneer Electronic Corp Tape amount detecting system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57105873A (en) * 1980-12-19 1982-07-01 Matsushita Electric Ind Co Ltd Magnetic recording and playback device
JPS6252389B2 (en) * 1980-12-19 1987-11-05 Matsushita Electric Ind Co Ltd
JPS57143772A (en) * 1981-02-27 1982-09-06 Pioneer Electronic Corp Tape amount detecting system
JPH0226313B2 (en) * 1981-02-27 1990-06-08 Pioneer Electronic Corp

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