Home

Primary Examiner: Griffin, Robert L.
Assistant Examiner: Psitos, Aristotelis M.
Attorney: Eslinger; Lewis H., Sinderbrand; Alvin

Next ten patents ordered by date:

Apparatus for detecting the position of fine object
Apparatus for receiving encoded messages on the screen of a television receiver and for redisplay thereof on the same receiver screen in a readable format
Self-contained adjustable yoke mounting system
Record reading device for magnetized tags
Capacitor protective system
Overvoltage protected integrated circuit network, to control current flow through resistive or inductive loads
Apparatus for monitoring and controlling liquid level
Accurate, fail-safe relay timer
Anti-static device
Solid electrolyte capacitor using oxide of Ru, Rh, Re, Os or Ir as electrolyte

Translate:
En
De
Es
Fr
It
Pt
Ja
Ko
Zh

Title: Recording and playback modulation method and apparatus

Abstract: Overlapping, minute regions of magnetization in a recording medium, which are produced during recording and cause distortion of the played back signal, are reduced by encoding the signal in a pulse signal. The time between pulses is varied according to the amplitude of the signal to be recorded, and when this pulse signal is recorded, the minute regions are reduced to elemental size. Thus they overlap less and do not distort the reproduced signal by offsetting the zero level.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Numakura, Toshihiko (Kamakura, JP)

Application Number: 812356
Filing Date: 1977-07-01
Publication_date: 1980-01-29
Assignee: Sony Corporation (Tokyo, JP)
Primary Class(es): 386/24 360/18, 360/30, 386/25
Other Classes:
US Patent Ref:

2492346	Dec, 1949	Arditi et al.	179/15.
3042754	Jul, 1962	McManis	179/15.
3174141	Mar, 1965	Sullivan et al.	360/48.
3435135	Mar, 1969	Yasuoka et al.	360/19.
3446914	May, 1969	Hodge	360/19.
3482038	Dec, 1969	Warren	360/30.
3622693	Nov, 1971	Del Clello et al.	358/4.
3688025	Aug, 1972	Whittemor, Jr.	358/132.
3701846	Oct, 1972	Zenzefilis	360/33.
3730983	May, 1973	Numakura et al.	358/4.
3749833	Jul, 1973	Rait et al.	360/32.
3812523	May, 1974	Narahara	360/33.
3814843	Jun, 1974	Kruszewski	358/195.
3836707	Sep, 1974	Murakami et al.	358/31.
3918085	Nov, 1975	Numakura et al.	358/8.
3969757	Jul, 1976	Amery	358/8.
4012771	Mar, 1977	Ishigaki et al.	358/4.
4012774	Mar, 1977	Kuniyoshi et al.	358/8.

Other Refs: Other References: Communication Systems; Carlson; McGraw-Hill .RTM. 1968, pp. 296-299.
Pulse, Digital and Switching Waveforms; Milliman & Taub; McGraw Hill .RTM. 1965, pp. 38-41.
Philips on Printing Motion; Reprinted from Eduology, vol. 4, Issue 1, 1973, pp. 1-7.