DE2940974A1 - MAGNETIC RECORDER / REPRODUCER - Google Patents

Description

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Claims (11)

PATENT LAWYERS Pioneer Electronic Corporation 4-1, Meguro 1 ~ chome, Meguro-Ku, Tokyo 153, Japan A. GRUNECKER H. KINKELDEY OFl-ING W. STOCKMAIR DR-ING. ■ ** E (CALTECH) K. SCHUMANN DR BER NAT - DlPL - CHYS P. H. JAKOB DPL-ING G. BEZOLD OR RER NAT - Dl PL-CHEM, 8 MUNICH 22 MAXIMIUANSTRASSE 43 October 31 P 14 333 _ 57 Magnetic recording and reproducing apparatus Claims Magnetic recording and reproducing device, marked by means for setting an optimal recording or magnetizing current by varying a bias current in arbitrary time intervals and digital storage and processing of reference recording / playback signals, the varied recording 030603/0053 TELEPHONE (ΟΘΟ) TELEX 00-Q03BO TELEGRAMS MONAPTH Vorniagnetisierungsstrom correspond to; a device for setting an optimal level by varying a level at arbitrary time intervals and comparing reference recording / playback signals, which _{correspond to the level thus varied:} with a reference level; and means for setting an optimal recording equalization curve by varying a recording equalization curve at arbitrary time intervals and comparing high-frequency band reference recording / playback signals in accordance with the thus varied recording equalization curve. 2. Apparatus according to claim 1, characterized g ekennz eichnet that the device for setting the optimal modulation after the device for setting the optimal recording bias current is operated, and that thereafter the device for setting the optimal recording equalization curve is operated. 3 · Device according to claim 1, characterized in that that the device for setting an optimal level control a: -: · device has to at least two optimal level control data and to subject these data to an additive averaging in a digital manner, to get a final optimal modulation current. 4. Apparatus according to claim 1, characterized in that that the facility for 030603/0 053 -X- i- Adjusting the optimal recording equalization curve comprises means to at least two optimal Obtain recording equalization data and subject this data to an additive averaging in a digital manner in order to obtain a final optimal To get recording equalization history. 5- device according to claim 1, characterized in that that the means for setting the optimum recording bias current comprises means for obtaining at least two optimal recording bias current data and subject this data to an additive averaging in a digital manner to obtain a final optimum recording bias current. 6. Magnetic recording and reproducing device, g ekennzeicb.net by means for varying a recording bias current at arbitrary time intervals; means for recording and reproducing a reference recording signal; means for storing the recording bias current corresponding! to the analog / digital converted reference recording / playback signals in a register; and a working means for reading out the stored in the register Content to subject it to a comparison operation so as to provide an optimal recording bias current is selected, the device being preset by the fact that in a register a digital signal is stored, which provides the optimal recording bias current. 030603/0 053 7. Apparatus according to claim 6, characterized in that the means for varying operates in such a way that it is varied as a function of an instruction issued by a microprocessor in every predetermined time period. 8. Device according to claim 6, characterized in that that the means for varying operates to increase the recording bias current digital as a function of a work command issued by a microprocessor varies. 9 · Device according to claim 6, characterized in that that the work equipment includes a command array in which the reference record / reproduce signals corresponding to the values of the recording bias current from a minimum value to a maximum value towards analog-to-digital conversion are subjected to the fact that dropouts are detected by an operation which is in the register stored content is based, and that if a dropout is detected, the information as for the operation is irrelevant and the work equipment returns to the initial operation or the dropout is processed as ineffective information. 10. Magnetic recording and reproducing device, g ekennzeicb.net, by means for varying a recording bias current 030603/0053 at arbitrary time intervals; means for recording and reproducing a reference recording signal; means for storing the recording bias current corresponding to analog / digital converted reference recording / playback signals in a register; a working device for reading out that stored in the register Contents to get the register contents of a comparison operation and thereby an optimal recording bias current to select; and control means for repeating a routine at least twice to set the optimum recording bias current select optimal recording bias currents by repeating of the routine can be obtained by subjecting the values to additive averaging in order to to maintain a final optimum recording bias current. 11. Magnetic recording and reproducing device, marked. by means for setting an optimal recording bias current, which is adjusted by varying a recording bias current at arbitrary time intervals and by digitally storing and processing reference record / playback signals accordingly the recording bias current thus varied; means for setting an optimal Modulation, which is set in that a modulation varies in arbitrary time intervals and the reference recording / playback signals corresponding to the modulation thus varied with a reference 030603/0053 29A097A levels are compared; a device for setting an optimal recording equalization curve that thereby it is set that a recording equalization curve varies at arbitrary time intervals and the high-frequency band reference recording / playback signals corresponding to the recording equalization curve thus varied be subjected to a comparison; and means for storing for the optimal Recording bias current, the optimal level control and the optimal recording equalization curve representative data in digital form, separately according to the types of magnetic tape, the data depending on Can be selected as required. 030603/0 053