Video floppy recording and reproducing device

[Detailed Description of the Invention]

Field of the Invention The present invention relates to a magnetic sheet at the video floppy disk recording and reproducing device which carries out record playback of the image sign. PRIOR ART Hereinafter, the conventional video 7a Zupee recording and reproducing device is explained, referring to drawings. Drawing 2 is a block diagram showing the composition of the conventional video floppy disk recording and reproducing device. Writing Drawing 2, as for an input terminal and 2, in 1, a record picture signal processing circuit and 3 are record amplification circuits, 4 and 6 switch and, as for a magnetic head and 7, in a switch and 6, a magnetic sheet and 8 are motors, As for a head transfer mechanism and 1o, in 9, an introduction amplification circuit and 11 are reproduction picture signal processing circuits, 12 -- an output terminal and 14 -- a cassette in sensor and 16 -- as for system control and 18, a start edge termination detection sensor and 16 are [ an elimination signal generation circuit and 20 ] memory circuits a detection detection circuit and 19 in En a motor control circuit and 17. The conventional video floppy disk recording and reproducing device constituted as mentioned above is explained. If system conte low 17 distinguishes having been loaded with magnetic sheet 7 with the signal of cassette in sensor 14, motor 8 will be rotated at predetermined number of rotations by motor control circuit 16. Next, magnetic head e is moved to the start edge according to head transfer mechanism 9 which operates by the signal of head transfer mechanism drive circuit 13. If start edge termination sensor 16 detects the start edge, change switch 5 will be switched to the d side, and it will change into a reproduction state, and will move magnetic head 6 in the direction of a termination, The image FM signal with which magnetic head 6 was recorded on each track of magnetic sheet 7 is taken up, and it distinguishes recorded/un-recording for the image FM signal which was amplified in introduction amplification circuit 1o and which carried out the image about each track in a Envelope detection detection circuit, and memorizes the distinction result in memory circuit 2o. If there is a recordable track, when it goes into record mode, magnetic head 6 will be moved to the vacancy track memorized in the above-mentioned memory circuit 2o. Next, a record method is explained. FM abnormal conditions are carried out after emphasis processing in record picture signal processing circuit 2, and the picture signal inputted from input terminal 1 is recorded on change switches 4 and 5 and magnetism through Rad 6 after amplification in record amplification circuit 3 at magnetic sheet 7. Next, a regeneration method is explained. The image FM signal which magnetic head 6 took up is performed by introduction amplification circuit 1 *, FM recovery and day emphasis processing are performed after amplification in reproduction picture signal processing circuit 11, and it sends out to output terminal 12 Yoshimita TV, a printer, etc. In order to eliminate arbitrary picture signals, upsilon elimination can do the signal which generates change switch 4 in the b side, and generated change switch 6 in the C side in the OFF Si substitute and elimination signal generation circuit 19 passing to magnetic head 6. Object of the Invention However, the fall of the reproduction output according to the field deflection of a magnetic sheet by the above composition, Abnormalities in the record conversion characteristic, such as Feeling casing etc. of the magnetic head which occurs when the magnetic body of the Drottu Alara Th A week magnetic sheet by the eccentricity of a magnetic sheet and the crack of a magnetic sheet adheres to a magnetic head, cannot be grasped. Therefore, when some were recorded on a magnetic sheet and the generating [ of an 8/N fall of the reproduction picture signal due to the fall of a record signal level ] and misjudgment exception of the Envelope detection detection due to reproduction loss of power was performed, it had the subject that the abnormalities of the record conversion characteristic could be recognized for the first time. The present invention will move a magnetic head to arbitrary tracks, if loaded with a magnetic sheet in view of the above-mentioned subject. It aims at providing the video floppy disk recording and reproducing device which detects the abnormal condition of the record conversion characteristic by carrying out record playback, and detecting and comparing a single frequency signal. Means for solving problem To achieve the above objects, a video floppy disk recording and reproducing device of the present invention is characterized by comprising the following: A track transportation device to which arbitrary tracks are made to move a magnetic head after loading with a magnetic sheet, A detection means which detects a single frequency signal reproduced by above-mentioned arbitrary track by record reproduction means which carries out record reproduction of the single frequency signal, and the above-mentioned record reproduction means, A detection data storage means which memorized beforehand data of a detection signal of above-mentioned arbitrary track, a comparison means to compare detection data memorized by a detection signal which detected the above-mentioned single frequency signal, and the above-mentioned detection data storage means. OPERATION The present invention detects the abnormal condition of the record conversion characteristic by comparing the detection data which has remembered the single frequency signal beforehand to be the detected detection signal after record reproduction with arbitrary tracks by the above-mentioned composition. EXAMPLE Hereinafter, while referring to one drawing for the video floppy disk recording and reproducing device of one example of the present invention, it explains. Drawing 1 is a block diagram showing the composition of the video floppy disk recording and reproducing device of one example of the present invention. Inside, the same number was given to the same component as the conventional video floppy disk recording and reproducing device. 3o of the track move drive circuit for a judgment and 32 is [ a detection storage-of-data circuit and 34 ] comparison circuits a detection circuit and 33 a single frequency signal generation circuit and 31. About the video floppy disk recording and reproducing device constituted as mentioned above, operation is explained using Drawing 1. Since the recording and reproducing systems of a picture signal are the same as that of the former, explanation is omitted. The 1 present invention explains the Eye ball state of a magnetic head as an example of a record conversion characteristic abnormal condition. It is cassette in sensor 14 (if system conte low N17 distinguish from itK, motor 8 will be rotated and magnetic head 6 will be moved to the start edge by head transfer mechanism drive circuit 13.) about having been loaded with magnetic sheet 7. Start edge termination detection sensor 16 detects the start edge, and it operates track move drive circuit 31 for a judgment with a start edge detection signal, Magnetic head 6 is moved to 1 track outside from for example, a start edge position (it is not this limitation, although it was made to move to positions other than the track for picture signal record reproduction and arbitrary tracks are explained here.). After moving magnetic head 6 to the track for a judgment, for example, it generated change switch 4 in the d side and generated change switch 5 in the C side in the OFF Si substitute and single frequency generating circuit 3o, the signal of 9 Peng is recorded. Change switch 6 is switched to the d side after recording a single frequency signal, the recorded single frequency signal is detected in detection circuit 32 after Construction width in introduction amplification circuit 1o, and it changes into a pulse signal, and is sent to comparison circuit 34. Comparison circuit 34 is beforehand connected with detection storage-of-data circuit 33 of a certain track where the detection data covered over 26 tracks is memorized. When the track positions which carried out an arbitrary setup with the track position which detection storage-of-data circuit 33 has memorized differ, memory detection data is amended according to an arbitrary setting track position. In comparison circuit 34, a difference with the number of pulses of the detection pulse signal of detection circuit 32 and the detection pulse signal of detection storage-of-data circuit 33 is compared (although the example which compares the difference of the number of pulses here explains). The difference of A bus width is compared and 7 is possible. The Eye ball state of the present magnetic head can be grasped. The single frequency signal recorded on the arbitrary track is eliminated with the output signal of elimination signal generation circuit 19 after the end of a judgment. Magnetic head 6 after the end of elimination is returned to a start edge position. if it is judged as one Eye, a warning lamp will be made to emit light and the power supply of the video floppy disk recording and reproducing device after warning lamp luminescence will be turned OFF. EFFECT OF THE INVENTION Gap width [ according to the present invention as mentioned above ] with the Eye ball of a magnetic head, The fall of record signal Level and degradation of reproduction S/N by reduction of the gap depth can be prevented before actually recording or reproducing a picture signal, and a misjudgment exception does not make the track already recorded into a non-recording track.

[Brief Description of the Drawings]

The block diagram and Drawing 2 showing the composition of a video floppy disk recording and reproducing device [ in / in Drawing 1 / one example of the present invention ] are a block diagram showing the composition of the conventional video floppy disk recording and reproducing device. 30 ...... single frequency generating circuit, 31 ...... track move drive circuit for a judgment, 32 ...... detection circuit, 33 ...... detection storage-of-data circuit, 34 ...... comparison circuit.