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■ Recording signal reproduction method 特 願 Japanese Patent Application No. 46-455900
Application No. 46 (1971) Priority claim on June 23 [Fa] June 23 B 1970 West イ イ 国 P P 2 O
32 269 4 Open Sho 47-1606 @ Sho 47 ( 1972) Jan. 27 0 Hans Jawhim Tuy Berlin Berlin 38
Albigel Wäck 1 Doug Gerhard Wyckkopf [Facial] Attorney Attorney Roland Sonderhoff The
Invention A Detailed Description of the Invention The present invention recorded signal, The
following magnitudes of pressure are applied to the surface of the record carrier which has
passed the side of the scanning device at the contact surface of the scanning device, ie the used
carrier material. The deformation of the carrier surface caused by the pressing force is more
pronounced than the deformation in the opposite direction due to the compression of the contact
surface of the scanning device if it exhibits a predetermined modulus of elasticity. To a method of
reproducing by a scanning device applying a pressing force was set to hear. A method of this
kind has already been proposed in German patent application P 15 74 489 5 This method should
make the elasticity of the record carrier as hard as possible and the elasticity of the scanning
device as soft as possible in order to expand the upper limit of the reproduction band frequency
limit as much as possible in the specialized field which has prevailed until then. In contrast to the
expectation that there is a plan for scanning the record carrier which is generally soft and which
is elastically deformable under the pressure of the scanning device with a scanning device which
is less likely to shift. The conventional view on the extension of the reproduction range of high
frequencies is as follows: Publications, Journals, Journal of the Audio Engineering Society, 1967
Mon, Vol. 15, No. 4, pp. 389-399 Listed in the article, Zee A. R. Batianes, "Factor's, Affairing, The,
Stylus / Group, Relationship, In, The, Fock Rough, Playback, Systems" is a suitable example
[111111] EndPage: 1 That is, this paper discusses the relevant theory in detail and presents an
upper limit value of the limit frequency that can be reached for scanning an acoustic recording
plate of the type generally used at that time. According to said prior art, the slider-like parts
which engage with the surface of the record carrier of the scanning device are extremely small
while the deformations containing the signal of the surface of the record carrier are compressed
significantly larger than the scanning device By means of the scanning device exhibiting the
movement amplitude, the frequency range further related to the upper limit frequency upper
considered to be insurmountable to the frequency range conventionally used by conventional
devices is opened up to several megahertz, within this frequency range In accordance with the
results of the experiment, practical recording and reproduction are guaranteed.
Thus, there is provided a method of recording and reproducing a broadband signal used, for
example, for recording and reproduction of television broadcasts. As mentioned above, in this
case a slider-like scanning device is used, the entry side of which is gradually closer to the
surface of the record carrier, but the exit side has a relatively sharp edge and this edge At the
location, the deformation is rapidly out of contact with the scanning device during reproduction.
Usually, frequency-modulated carrier oscillations are recorded, but the advantage is that the
amplitudes of the carrier oscillations do not change and the relief reproduction heights of the
deformations recorded in high and low recordings are all equal to one another, One or the other
elevations such as occurs in the case of amplitude modulations of different heights, where the
sliding-like part of the scanning device always covers the multiple wavelengths of the carrier
oscillation in contact with any of the elevations Not to leak it. The scanning device thus records
with the pressure pulse the escape of the individual elevations from its contact area at the
"sharp" edge. This description of the function of the above-mentioned prior proposed method
was needed, since there has been no publication of this type of so-called "pressure scanning". In a
method of the type described at the outset of the Detailed Description of the Invention, a number
of narrow band signals are recorded according to the known multi-channel scheme in accordance
with the associated wide operating frequency band with different frequencies of up to several
megahertz. A wide band signal, for example a video signal, can be recorded and reproduced,
including the entire frequency range which can or can be used. In the latter case, it is additionally
necessary to put one or more signals, for example audio signals or television information on the
same record. The principle of pressure scanning of the frequency modulated carrier summarizing
its features seems to be that additional signal oscillations or superposition of the modulated
carrier should be avoided, because with this kind of superposition one vibration to be scanned
The advantage of being at the same height as each other may be lost. The beats of the two
signals recorded in an overlapping manner clearly produce an amplitude modulation-like
relationship at various height positions, so that the slider-like scanning device is at the bottom
(relatively low) of the beat curve. Can not detect. The basic object of the present invention is to
provide a method which eliminates the aforementioned defects and which can add one or more
additional signal oscillations in the manner of the above-mentioned type, yet without the
expected disturbances in the scanning. It is. In order to solve this problem, according to the
present invention, another signal of lower frequency is superimposed as a carrier signal of the
wide band signal by the wide band signal recorded as one-frequency modulated carrier wave
oscillation, and its amplitude is The scanning edge of the portion of the slider-like scanning
device which is relatively small compared to the amplitude and engages the surface with the
deformation formed by superposition with the low frequency signal recording, the average high
When detecting the high end of the high frequency wide band signal, the contact should be kept
with the corresponding high end of the wide band signal which corresponds to the low end of the
low frequency signal recording, and therefore below the average height.
Taking into account the compression of the deformations representing the frequency-modulated
broadband signal caused by the pressure of the scanning device, the pressure detection in
general by limiting the amplitudes of the other signals as compared to the amplitude of the
broadband signal as in the present invention It can be in constant contact with the individual
highs of the broadband signal passing through the trailing edge of the scanning device acting as
the device. The occurrence of such an action is a simple criterion for the correct setting and
selection of the variable parameters, ie the elastic modulus of the record carrier, the magnitude
of the deformation, the length and shape of the scanning device slider and the contact pressure.
Can a characteristic curve diagram of the output voltage profile of the scanning device easily be
recorded using an oscillograph device and whether a relatively high frequency broadband
vibration reproduction gap occurs at a relatively low frequency additive signal vibration? The
generation of this reproduction gap can be detected by the selection of an inappropriate
parameter. [111111] EndPage: 2 When such values are used as in the present invention, such a
reproduction gap does not occur. A feature of the record carrier used in the method according to
the invention is that by superimposing other signals so that they can be detected by the
broadband signal and the carrier, the wavelength of one or more other signals can be It is larger
than the maximum wavelength corresponding to the lower limit of the frequency limit. In this
case, for example, the associated amplitude of one or more other signals may be smaller than
the% of the associated amplitude of the broadband signal. This condition means that in order to
achieve gapless scan reproduction of all high-pass broadband signals performed by the method
according to the present invention, it is sufficient to compress the high section to the amplitude
of It is not necessary to flatten completely. The pressure resulting from the deformation, which is
applied to the pressure-based scanning device in the prior art pressure scanning system
described above, is apparently approximately first proportional to the press-in depth, given the
deformation within the elastic range. The resulting pressure is further proportional to the
bearing surface. Since this plane increases with the increase of wavelength (for example, if the
width of the recording track in one groove is the same), the frequency characteristic of the
scanned signal occurs at 1/1, where ω is the angular frequency. A relatively low frequency
signal is thus generated at the output of the scanning device with a relatively large amplitude
(see the German patent application mentioned as prior art). In order to obtain approximately the
same amplitude for two or all mutually superimposed signals during scanning, the amplitude of
the low frequency oscillation is reduced corresponding to the ratio of the image frequency during
recording. Just do it.
This relationship is useful for amplitude conditions to continuously scan the height of the
broadband signal. The subject matter of the record carrier formed according to this embodiment
of the present invention is that the relative amplitudes of one or more other signals are inversely
proportional to the relationship between that wavelength and the average wavelength of the
broadband signal. To be smaller than the relevant amplitude of the broadband signal. The other
signal to be superimposed on the wideband signal may be an audio signal control signal or a
color signal. For example, modulated carrier oscillations such as voice signals can be used in the
form of frequency modulated carrier oscillations as such other signals. It is also possible to use
other signals, for example one audio signal, one control signal and one color signal together with
the wideband signal, taking into account the state of the amplitude relative to the sum of the
other [111111] signals on the basis of the relevant amplitude of the wideband signal. . In order
to conform to the currently prevailing television standard, the color signal is reduced to be within
the frequency fluctuation range of the wide band signal by the color carrier signal defined in the
PAL, NTSC or SECAM standard, ie mixing. It may be a color carrier frequency of the carried
carrier frequency. Experimental Results The frequency for a suitable color carrier is between 300
KHz and 1000 KHz. The invention will now be described in detail with reference to the illustrated
embodiment. A portion of the record carrier 1 shown in cross section in FIG. 1 corresponds in
terms of its strength to the conditions of the method according to the prior art described above,
and thus from the groove carrier used for sound recording It is also soft. The elastic coefficient
may be 20000 kgw / d or less, for example, 10000 k9 w / 7 or less within the deformation
range. The record carrier may be in the form of a circular disc, as in a conventional record disc,
but may also be in the form of a tape or strip. A deformation containing a signal is formed in the
groove 12 on the surface of the record carrier 1, this deformation being formed by engraving,
spraying or casting as in the case of high and low recording on a record disc. . The part of the
carrier shown in the figure moves relative to the slider-like part 3 of the scanning device in the
direction of the arrow shown. The scanning device further comprises a mechanical-electrical
converter 2, for example a piezoceramic body and a damping body 5 made of a vibrationabsorbing material. The output voltage supplied from the side electrode of the converter 2 is
taken off via the line 11. The entire scanning device is fixed to the flat end 7 of the guiding arm 6
and the other end of the guiding arm is fixed by means of the elastic link 9 to a sliding body not
This slide is guided, for example, in response to the radial advance of the scanning device when
using disc-shaped record carriers and spiral grooves. The forward movement of the record
carrier 1 in the direction of the arrow causes a deformation on the lower side of the slide to the
left of the slide-like part 3 of the scanning device, but in this case the pressure is gradually
increased and the deformation is pressed In this case no pulsed pressure signal is generated.
Such a pulsating signal is generated when the deformation, which appears as height, leaves the
contact area of the scanning device on the side with the sharp edge on the right. FIG. 2 shows a
cross section in the direction of the groove length of the record carrier 1 with [111111]
EndPage: 3 greatly enlarged. The relative movement between the record carrier and the scanning
device slide 3 is indicated by the arrows. The edge 4 of the scanning device is located on the left,
and the part of the slider, which is gradually rising in one direction, is located on the right. It can
be seen that when sending the record carrier 1 to the slide 3 the high part 13 of the frequencymodulated broadband signal gradually engages on the right with the slide covering a relatively
large number of wavelengths. The high end 13 at the right end is not yet in contact with the
slide, the second high from the right just contacts, and the left high is all pressed to varying
degrees. At the weir edge 4 one high leaves the area of the slide, so that the pressure on the slide
is reduced dramatically. The double (same) component amplitude of the broadband signal is
denoted 2b. Further, as shown in FIG. 2, another high frequency signal is superimposed on
another high frequency wide band signal, and this process is shown by a dashed-dotted sine
wave line, and the lower part of the sine wave line is indicated by 14 in the center of the figure.
The high part is indicated by 15. As a result of the superposition, the line indicated by the dashed
line becomes the center line of the broadband oscillation, and the high part of the broadband
oscillation does not show the same level with respect to the scanning device. The amplitude of
the low frequency signal is indicated by a. Due to the pressure of the slide 3 of the scanning
device, the high part 13 of the broadband signal is compressed mainly where this high part
coincides with the high part 15 of the low frequency signal and shows the highest level with
respect to the slide of the scanning device Oh. In the present invention, this compression is made
to the following value by selecting the value of the relevant parameter, i.e. the scanning device at
the left end, which is in the middle of the lower part 14 of the low frequency signal and thus
shows the lowest level. The high 13 close to the edge 4 of the rim is sufficient to take out the
pressure pulse so that it is compressed to a slight degree as seen in the figure. Maintaining such
contact or slight compression even in the case of the high part 13 which coincides with the low
part of the low frequency signal is, for example, low (... Frequency) given other relevant
conditions. Is selected by selecting a sufficiently small amplitude of the vibration of the slider 3
and the pressing force of the slider 3.
One numerical sequence gives an explanation of the usable state obtained by the actual
experiment. For example, the luminance signal is recorded at a bandwidth of 2.5 MHz, the
chromaticity signal at a bandwidth of 300 KHz, and the audio signal at a bandwidth of 10 KHz.
First, the luminance signal is frequency-modulated by a known method and recorded, for
example, in a range of 3 to 4 MHz with a width of [111111] 1 MHz. The geometrical amplitude
of this FM recording of the record carrier is then 1 μm. Based on a color carrier frequency of
about 500 KHz, the geometrical amplitude of the corresponding recording can be reduced by the
ratio 500 KHz: 3.5 MHz (average FM carrier oscillation). Therefore, in this case this amplitude is
H μm. Selecting a voice carrier frequency of 100 kHz can reduce this geometric board width to
735 μm. When the additional signal is reduced to this extent, in the case of a commercially
available synthetic material, such as polyvinyl chloride thin plate, which has been subjected to an
experiment for pressed scanning reproduction, the respective high frequency signals are reliably
scanned and reproduced continuously. It is enough for The states of amplitude shown in this
example also apply to the case of trying to obtain electrical output signals of the same
magnitude. For example, in many cases where a higher signal-to-noise ratio is sought, it is
advantageous for one of the signals to obtain an amount of deviation during scan reproduction.
In this case, the state of the amplitude also has to be changed correspondingly during recording.
In this case, however, always the conditions applied to the gapless mechanical scanning
reproduction with regard to the press-in depth of the sliding of the scanning device into the
undulating peaks of the FM oscillations must be maintained. The illustrated chromaticity signal is
a low-converted standard color signal (PAL, NTSC) at the color carrier frequency. SECAM)で
あってもよい。 During reproduction this signal is converted back to the standard color carrier
frequency value by mixing with the auxiliary signal. FIG. 3 is a curve showing the relationship
between the amount of electrical output 5 (t) at the lead 11 of the electromechanical transducer
2 and the time t when using the present invention. The curvilinear wave train 16 occurs, as
shown in FIG. 2, as the ridge 4 of the scanning device moves from the position of its left end to
its right end. The total pressure exerted on the slide drops sharply with the pressure pulse 14 'in
the transducer 2 as the elevation 13 shown in FIG. 2 leaves the pressure range of the slide of the
scanning device. This pulse is shown individually at 13 '. This elevation corresponds to the
degree of pressure release in each case, 2 or the degree of previous compression. Thus, the pulse
train is amplitude modulated by the low frequency signals of the series of curves 14'-15'-14
'shown in FIG. 2, so that the pulse train 16 also exhibits a corresponding amplitude modulation
from low 1'4' to high 15 '. , And again to the lower part 14 ', similar to the characteristic curve of
the low frequency signal shown in FIG. 2 [111111] EndPage: 4.
As the course of the characteristic curve shows, there is no gap in the scanning reproduction of
high frequency signals. The two vibrations are thus separated by the limiter and the filter and
completely reproduced in their original form. The diagram shown in FIG. 4 is a variant of this
situation. In this case, without regard to the criteria of the invention, the parameters which are
important for the operation and effect are mistakenly selected as a result of which the peripheral
edge 4 of the scanning device does not contact the high part 13 of the broadband oscillation in
the time portions t2 and t3 and so the corresponding scanning A regeneration gap occurs, in
which there is no pulse 13 '. The signal is not completely reproduced from the combined
characteristic curve of the output quantities of the scanning device, because this signal only
provides information in the time part t1. The method according to the invention and the record
carrier used in this method are suitable for recording and reproducing complete color television
programs by means of luminance, chrominance and audio signals, but a plurality of other signals
besides broadband signals. It can also be used for other purposes for entering a signal. The
broadband signal may be, for example, a video luminance signal, and the signal to be
superimposed on this signal may be, for example, a color carrier signal of a standard that
indicates modulation amplitude as found in color television NTSC and PAL. Good. In this case,
particularly good quality is obtained in the reproduction of the signal recorded on the carrier if
the maximum amplitude of the carrier color carrier signal is smaller by a factor of 3 to 4 than the
amplitude of the recorded video luminance signal.
Brief description of the drawings
FIG. 1 is a schematic diagram of an apparatus used in the method of the present invention in a
pressing scanning device according to the prior art, and FIG. 2 is a diagram showing two
mutually superimposed signals. An enlarged vertical sectional view of a groove provided with a
deformed portion of a record carrier having a defect according to the present invention, FIG. 3
takes a scanning voltage as an ordinate and takes time on a horizontal axis, high portion of signal
vibration of high frequency FIG. 4 is a curve diagram corresponding to FIG. 3 in the case of scan
reproduction with gaps of high frequency signals, for the purpose of explaining the case of
scanning reproduction without a gap, and FIG. 1...... · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · Elastic link device, 10 · · · · · · 11 ...... conductor, 12 ...... groove, 13
the high portion of ...... wideband signal, 14 ...... lower part, 15 ...... low frequency The high part of
the signal, 16... [111111]EndPage: 5
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