JPS5939299Y2 - magnetic recording device - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a magnetic recording device such as a tape recorder.

Generally, as shown in Figure 1, magnetic recording devices use high frequency signals (for example, I KHz
(compared to the case of 10 KHz), a shallower recording bias increases the reproduction output, and when the signal frequency is low (for example, in the case of IKHz), a deeper recording bias increases the reproduction output.

Furthermore, since the steep rise of the signal to be recorded includes many harmonic branches, the number of high frequency components increases.

Therefore, if the optimal recording bias amount is set for IKHz or the like as in a normal tape recorder, the reproduction output of the above-mentioned high frequency components will be low.

If you make the recording bias shallow to be optimal for 10KHz,
The distortion rate becomes worse in reproduced signals such as IKHz.

The present invention eliminates the above-mentioned drawbacks and provides a magnetic recording device that can record and reproduce even signals with a steep rise and many high-frequency components. The means 1 for detecting the steep rise of the signal to be recorded comprises means 1 for detecting a steep rise, and means 2 for shallowing the recording bias when the above-mentioned steep rise is detected by the means. , means 3 for detecting the average value (or effective value) of the signal, means 4 for detecting the peak value of the signal, and means for comparing the detected average value (or effective value) and peak value. 5, and is configured to shallow the recording bias when the peak value becomes higher than the average value (or effective value).

14 is an input terminal for a signal to be recorded, and the signal from this terminal is supplied to the recording amplifier 6 and the high-pass filter 1.

The signal is supplied to a well-known recording head 8 via the amplifier 6, and a recording bias current from a bias oscillator 9 is superimposed thereon as well-known.

The signal that has passed through the filter 1 is amplified by an amplifier 10, and is supplied to a well-known means 3 for detecting an average value (or effective value) and a well-known means 4 for detecting a peak value.

The outputs of these means 3 and 4 are input to the well-known means 5 which is a differential amplifier, and when the peak value is higher than the average value (or effective value) by an amount of light, the output of the means 5 causes the transistor 11 to be inputted. is turned on, and as a result of this turning on, the current supplied to the oscillator 9 and the head 8 decreases, and the recording bias becomes shallower.

Note that 12 is a variable resistor that adjusts the bias amount, and 13 is an LC circuit that resonates at the bias frequency.

As described above, the present invention comprises means 3 for detecting the average value (or effective value) of the signal to be recorded, means 4 for detecting the signal no-heek value, and the detected average value (or effective value). and a means 5 for comparing the signal and the peak value, and the recording bias is made shallow when the peak value becomes higher than the average value (or effective value). It is possible to sufficiently record and reproduce high frequency components during steep rises.

[Brief explanation of the drawing]

FIG. 1 is a graph showing reproduction output versus recording bias amount using the frequency of a signal to be recorded and reproduced as a parameter, and FIG. 2 is a block diagram showing an embodiment of the present invention. 3... Means for detecting the average (@ (or effective value)) of the signal to be recorded, 4... Means for detecting the peak value of the signal to be recorded, 5...・Means for comparing the average value (or effective value) and peak value of the signal to be recorded.

Claims (1)

[Scope of utility model registration request] means for detecting the average value (or effective value) of the signal to be recorded; means for detecting the peak value of the signal; and means for comparing the detected average value (or effective value) and the peak value. A magnetic recording device comprising: a recording bias that is shallower when a peak value becomes higher than the average value (or effective value).