Registers – Records – Magnetic
Patent
1998-06-18
2000-03-28
Le, Thien M.
Registers
Records
Magnetic
235449, G06K 1906
Patent
active
060420146
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a method for recording and reproduction of phonic information, and possibly also video and other information, on magnetic strips, and the related reading/writing apparatus.
BACKGROUND OF THE INVENTION
Reading/writing audio information on magnetic strip usually takes place using a tape-supporting the strip and wound on a reel and, as reading/writing means, a magnetic head positioned close to the tape which moves below it at a uniform speed, drawn by appropriate motor means which ensure the alignment of the tape below the head and the uniformity of the relative movement.
The uniformity of the movement is an essential requirement, and is a critical factor.
If this is not so the audio playback is distorted in an annoyingly noticeable manner while, conversely, errors of alignment and variations in the angular orientation of the air gap of the magnetic head with respect to the magnetic track both during recording and reading are much less noticeable on playback, translating into an attenuation of the signal read (which may largely be compensated for with systems for automatic gain control, thus controlling the volume), and a limitation of the frequency response, perceptible only to the most refined ear.
SUMMARY OF THE INVENTION
The method according to the invention enables the strip to be read/written using a suitable instrument shaped, for example, like a pen and, therefore, being of dimensions such that it can be held with one hand, provided with digital or analogue internal signal storage, and which is passed manually, and therefore at a speed that is difficult to keep uniform, over a magnetic strip which is of limited length of approximately 20-30 cm and fixed to a suitable support such as, for example, a sheet of paper, without requiring electro-mechanical instruments to move the magnetic strip.
To this end, it is provided that during the recording of the signal representing the phonic information on the magnetic strip, the signal itself is sent to the recording head, preferably following compression by a factor n, mixed or otherwise associated with a succession of time-marking pulses which define time intervals of a predetermined duration T.
The source of the signal to be recorded may be the same apparatus used for reading and playback, or it may be a different apparatus, and the time-marking pulses may, as will be seen later on, be pulses mixed with the signal, pulses recorded on a timing track parallel to the signal-recording track, or optically readable periodic markings disposed on a pre-recorded strip parallel to (or even superimposed on) the signal-recording track.
During reading, the output signal from the read head is sampled at a suitable frequency, to be determined as explained later on, and the individual samples are stored in a read write memory (following quantization if the memory is of the digital type).
According to the type and the method of associating the time-marking pulses with the signal, the marking pulses are read by the same magnetic head Which reads the signal (mixed pulses), by an additional magnetic read head, or by a section of a two-track magnetic read head (pulses recorded on a timing track), or by an optical sensor (pulses prerecorded on an optical track).
It is also possible to form a system in which the periodic time markings are "virtual", and the corresponding marking pulses are generated by an encoder instead of the optical sensor, which acts by the relative movement between the read/write apparatus and the recording support.
As will be explained later on, the marking pulses are used to determine the sampling frequency during reading or, if this is fixed and predetermined, to determine the number N.sub.S of samples between one marking pulse and the next, this series of samples being from now on called the "inter-mark sample series".
In this second case, the numbers N.sub.S relating to successive inter-mark sample series, these also advantageously being stored, are used to determine the sampling frequency, that
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Dippert William H.
Le Thien M.
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