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t Title of invention
Automatic gain am method in disk recording system
5. Detailed Description of the Invention The present invention relates to an automatic gain
control method in a disk recording system, and when cutting and recording a signal through a
discriminant amplifier, high fidelity reproduction is possible without loss of volume feeling
during reproduction. It is an object of the present invention to provide a scheme capable of
automatically gain controlling the above limiting amplifier. Conventionally, a limiting amplifier
that performs automatic gain control in a disc cutting and recording system is generally used. 0
This limiting amplifier makes it easy to trace the pickup cartridge in order to obtain good
machinability and at the time of reproduction. It is used to automatically control the level to an
appropriate level when the level of a signal such as a music source becomes large. However, even
if the disk is cut at the same frequency and the same signal level, EndPage of the cartridge and
the disk at the outer peripheral portion and the inner peripheral portion of the disk, and the
tracing-like Mdi of the azalea are deteriorated. For example, if there is a large acoustic flymax 0
at the end of the symphony due to the source; this end exists on the inner periphery of the cut
and recorded disc, and along with this, tracing attempts in this part; The sound quality was
extremely harmed. Similarly, in a multi-channel disc cut by a multi-channel disc cutting and
recording system, not only distortion increases as it goes from the outer periphery to the inner
periphery, but also the degree of interference of the angle modulation wave increases and
abnormal noise may be generated. there were. In order to cope with these problems,
conventionally, when recording a disc, it is necessary to lower the cutting recording level entirely
in advance or to control the limiting 'l' pump deeper than the beginning. In this method, the
sense of sound was sacrificed from the beginning when cutting and recording (point 6 points).
The present invention eliminates the above disadvantages and will be described with reference to
the accompanying drawings. FIG. 1 shows a block diagram of an embodiment of an automatic
gain control system in a disk recording system according to the present invention. In the figure,
reference numeral 1 denotes a disk cutting recorder having a switching circuit 2. Now, the cutter
head of the Toki disk cutting and recording machine 1 is directed from the outer periphery to the
inner periphery to perform cutting recording. Then, in the process of the cutting and recording,
pulse voltages a to e shown in FIGS. 2 (4) to (E) are sequentially generated from the switching
circuit 2. On the other hand, the reset pulse f shown in FIG. 2 (F) is generated at the lead-in time
before the pulse voltage a6 = generated from the switching circuit 2.
The above pulse voltage a / ? ? e is applied to the gate circuit 3, and the pulse voltage g of the
pulse ll @ lT1 is sequentially generated from the gate circuit 6 as shown in FIG. 2 (G)
corresponding to each pulse voltage aNe. . The pulse voltage gFi is applied to the monostable
multivibrator 4 and shaped into a pulse voltage having a pulse width T2 slightly wider than the
L-period pulse width T1 as shown in 25th (H). This pulse voltage is made to be the differential
pulse 1 as shown in FIG. 2 (1) by the differentiating circuit 5 and then supplied to the staircase
wave generator 6. The reset pulse f is applied to the monostable multivibrator 8 to be waveformshaped, and then applied to the stepping circuit 9 to disuse the staircase wave 11 L pressure of
the staircase wave generator 6 and transmit it in advance. It is reset. The above-mentioned step
wave generator 6 generates a round step wave j shown in FIG. 2 (, r) due to the accumulation of
the differential path / L rate j. The step wave j is converted into an integrated waveform k or 1 as
shown in FIG. 2 (3) or (L) by the integrating circuit 7 and then this is converted into a limiting
voltage # 1 as a DC umbrella circuit in the feedback portion of the limiting amplifier. The audio
signal m shown in FIG. 2 (b), which is supplied to this terminal 11 at the long terminal of the 11
Fi limit и f amplifier, supplied to 1 o is divided by the resistor 12 and the FIT 13 as a variable
resistor. The amplified voltage is amplified by the hT1 amplifier 14. The amplified output signal
passes through the IgII control signal amplifier 15 and is rectified by the rectifier 16 and then
converted by the integrating circuit 17 to WIJ ? voltage and then supplied to the DC amplifier
regulator circuit 1 ░. Here, the control voltage obtained by integrating the signal is controlled by
the control voltage obtained by integrating the step wave. In accordance with the control voltage
of ? / l, the above 10? The gate of the FIT 13 is controlled to change the internal resistance
between the drain and the source of the FF 1 T 13 by (11). Thereby, the gain of the limiting
amplifier is controlled. The output signal whose gain is controlled as described above is taken out
from the output terminal 1B. In addition, as the cutter head passes through the lead-in and
advances from the outer thorax to the inner peripheral part of the disc at the time of disc
recording and recording, the lt control voltage is increased as shown in (2) and (L) in FIG. As
shown in the figure, move to the lower side with the limit value h, 5 ? n-B. As a result, the abovementioned output signal becomes small with the signal nxs as shown in FIG. 2 depending on the
valley height of the (l + 1) step wave. The period in which the signal lI occurs is actually located
slightly before the lead-out time.
As described above, the automatic gain control method in the disk recording system according to
the present invention limits the limiting amplifier of the LP by the control voltage EndPage: 2
voltage obtained from the pulse voltage sequentially generated according to the position where
the cutter head advances. In order to control the limit so that it gets deeper gradually, it is
possible to record the disc so that the average volume feeling during playback is not lost, and
because of Toki, the toning distortion during playback is As a result, the high fidelity change can
be reproduced, and even in the case of a multi-channel disc, it has features such as sound
recording 1-so that distortion and abnormal noise due to interference with the angle modulation
wave do not occur.
4. Brief description of the drawings FIG. 1 is a block diagram of an embodiment of an automatic
gain control method for a disc recording yarn according to the present invention, and FIGS. 2 (4)
to 2 (M) are block diagrams of FIG. FIG. 3 is a signal waveform diagram in each part, and FIG. 3 is
an input / output level characteristic diagram of the limiting amplifier in the embodiment.
DESCRIPTION OF SYMBOLS 1 ... Disk cutting recorder, 2 ... Switching circuit, 3 ... Gate circuit, 4, 8
... Monostable multivibrator, 5 ... Differentiation circuit, 6 ... Step-wave generator, 7 и и и integration
circuit, 9 и и и switch circuit, 10 и и и и и и и и и и и и и и и и и и и и 11 input terminal, 13 и и и lFF1T, i4 и и и main
amplifier, 15 и и и control signal amplifier 16 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
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description, jps49122701
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