Patent
Tape sensing device for magnetic tape recording and/or reproducing apparatus
Kenkichi Umeda,Hiroyuki Yamauchi +1 more
Reads0
Chats0
TLDR
In this article, a level detector for detecting the level of the sensed magnetic remanence of a magnetic tape was proposed, which can be used for controlling a frequency equalizing circuit and/or a bias oscillator included in the signal recording circuit of the recording and reproducing apparatus.Abstract:
A device for sensing the type of magnetic coating on a magnetic tape while the latter is at rest, for example, in a magnetic tape recording and/or reproducing apparatus, has a DC magnetic recording head energizable by a predetermined DC voltage for applying a DC magnetic flux to the tape with which such head is engaged, a magnetic sensing element preferably coupled with the DC magnetic recording head for sensing the remanence or residual magnetism in the tape while the latter remains at rest following the application of the DC magnetic flux to the tape, and a level detector for detecting the level of the sensed remanence of the tape as an indication of the type of magnetic coating thereon. Such level detector may be advantageously employed for controlling a frequency equalizing circuit and/or a bias oscillator included in the signal recording circuit of the recording and/or reproducing apparatus so as to automatically adapt the latter for recording operations on the particular type of tape installed therein.read more
Citations
More filters
Patent
Information recording and/or reproducing apparatus with an optical medium sensor for providing automatic variation in light beam intensity in accordance with various recording medium
TL;DR: In this paper, a light projecting device for projecting a medium-detecting-light flux onto the surface of the optical recording medium, a discriminating device for detecting the level of reflected light or the transmitted light, and an intensity changing device for changing the intensity of the beam on the surface in accordance with the determination of the discriminating device.
Patent
Magnetic recording and reproducing apparatus automatically adjustable to each individual magnetic tape
TL;DR: A magnetic recording and reproducing apparatus comprises a source for producing test signals, a variable-gain amplifier, an equalizer, a recording bias generating circuit, a control unit for supplying control signals to the amplifier, equalizer and recording bias generator, a memory and an operating circuit unit as discussed by the authors.
Patent
Method and apparatus for noise reduction in magnetic media recordings
TL;DR: In this paper, a method and apparatus is disclosed or determining the remanent noise in a magnetic medium by DC saturation of a region thereof and measurement of the remaining DC magnetization, which can then be compensated for in either or both of the record and playback modes for all varieties of magnetic media.
Patent
Information recording/reproducing apparatus including setting optimum recording condition or reproducing condition
TL;DR: An information recording and reproducing apparatus includes: a recording device to record information to a recording medium such as a magnetooptic disc, optical disc, or the like; a reproducing device to reproduce the information recorded to this medium; and a controller to control the recording and replicating devices on the basis of optimum recording and replaying conditions for the recording medium which have preliminarily been recorded in a predetermined area of the medium.
Patent
Method and system for automatically providing flat frequency response to audio signals recorded on magnetic tapes
TL;DR: In this paper, a first and second audio test signals of different frequencies are generated by a variable frequency test signal source, recorded on a magnetic tape and reproduced to represent the magnetic properties of the tape at the different frequencies.
References
More filters
Patent
Cartridge-type magnetic tape recording and reproducing apparatus with means to indicate the coercivity of the tape
TL;DR: In this article, a magnetic tape recording and reproducing apparatus is designed to automatically adjust the recording or reproducing conditions according to the physical characteristics of the magnetic tape accommodated in a tape cartridge.
Patent
System for discriminating classification of a magnetic recording medium
TL;DR: In this paper, a system for discriminating the classifications of magnetic recording mediums comprises means for recording a discrimination signal of a constant frequency with a bias of a predetermined quantity, means for erasing partially the discrimination signal with a specific degree of erasing in a manner to make possible reproduction, and means for reproducing the discriminated signal thus incompletely erased thereby to obtain a discrimination output.
Patent
Switching parameters for recording/playback or magnetic media having different coercivity and/or retentivity characteristics
TL;DR: In this article, an IBM TABULATION CARD (MASTER) was used for direct recording of MASTER RECORDS and COPY CIRCUIT DIAGRAMS.
Patent
Power supply circuit for varying the bias signal to a magnetic head
TL;DR: In this article, a bias curcuit for a tape recorder is provided where an input voltage of the bias oscillator is changed in accordance with a magnetic tape material, which is used to change the bias frequency.