JPS57154933A - Control device of signal waveform - Google Patents

Control device of signal waveform

Info

Publication number
JPS57154933A
JPS57154933A JP4119681A JP4119681A JPS57154933A JP S57154933 A JPS57154933 A JP S57154933A JP 4119681 A JP4119681 A JP 4119681A JP 4119681 A JP4119681 A JP 4119681A JP S57154933 A JPS57154933 A JP S57154933A
Authority
JP
Japan
Prior art keywords
cycle
signal waveform
waveform
duty
counter
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
JP4119681A
Other languages
Japanese (ja)
Other versions
JPS6355250B2 (en
Inventor
Hiroshi Mizuguchi
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4119681A priority Critical patent/JPS57154933A/en
Publication of JPS57154933A publication Critical patent/JPS57154933A/en
Publication of JPS6355250B2 publication Critical patent/JPS6355250B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/003—Changing the DC level
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K12/00—Producing pulses by distorting or combining sinusoidal waveforms
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/156—Arrangements in which a continuous pulse train is transformed into a train having a desired pattern

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Amplifiers (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

PURPOSE:To avoid the lack of the positive/negative symmetry of the signal as well as the superposition of the DC component when the amplification is carried out for a signal waveform in which the inclination near the zero cross point has a finite value like a sine wave, etc. CONSTITUTION:The diagram shows the primary part of a control circuit for waveform of position detection signal of a brushless motor which uses a Hall effect element 1 for a rotary position detecting element. The duty of the above- mentioned output signal waveform is read in the 1st cycle of the output signal waveform of a waveform shaping circuit 7 which is synchronized with the clock pulse. Then the offset is carried out based on the reading result of the duty and in the 2nd cycle subsequent the 1st cycle. In such a way, the read value of a counter 300 shows [00000] or [11111] in the 1st cycle in the duty of the output signal waveform of the circuit 7 is finally set at about 50%. Then a counter 500 has no change of its count value in the 2nd cycle. Thus the offset compensation is continuously carried out based on the count output of the counter 500.
JP4119681A 1981-03-19 1981-03-19 Control device of signal waveform Granted JPS57154933A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4119681A JPS57154933A (en) 1981-03-19 1981-03-19 Control device of signal waveform

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4119681A JPS57154933A (en) 1981-03-19 1981-03-19 Control device of signal waveform

Publications (2)

Publication Number Publication Date
JPS57154933A true JPS57154933A (en) 1982-09-24
JPS6355250B2 JPS6355250B2 (en) 1988-11-01

Family

ID=12601660

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4119681A Granted JPS57154933A (en) 1981-03-19 1981-03-19 Control device of signal waveform

Country Status (1)

Country Link
JP (1) JPS57154933A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2589317B2 (en) * 1987-07-31 1997-03-12 シャープ株式会社 Optical disk recording and playback device

Also Published As

Publication number Publication date
JPS6355250B2 (en) 1988-11-01

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