CN100380458C - Method for modulating information signal - Google Patents

Abstract

The invention relates to an information signal modulation method, which comprises the following steps: firstly, polarizing a light source to obtain linearly polarized light; making the linear polarized light penetrate an optical active substance; then, the optical rotation of the linearly polarized light after penetrating the optical rotation material is detected and the optical rotation is interpreted to obtain a digital signal. Because the information signal modulation method of the invention utilizes the characteristic that the optical rotation of the polarized light can be changed by the optical rotation substance, and then the magnitude of the optical rotation is judged to obtain the digital signal, the function of signal modulation can be achieved; and because the information signal modulation method of the invention is modulated by the optically active substance, the situation of wrong signal interpretation in the existing modulation method can be improved, and the environmental pollution caused by using dye can be avoided.

Description

Information Signal Modulation Method

technical field

The present invention relates to a modulation method, in particular to an information signal modulation method that can solve the problems of information signal interpretation error and environmental pollution in the conventional modulation method.

Background technique

With the advancement of technology, digitization has become a technological indicator and future trend. However, there are various analog signals (that is, analog signals, hereinafter referred to as analog signals) around us. In order to make full use of analog signals, it is necessary to The information (that is, data) communicated and disseminated, various modulation (modulation) methods came into being. The so-called modulation here generally refers to the method of converting an analog signal into a digital signal.

For example, in the digital system constructed by the computer, all its signals are represented by the binary system (Binary System), that is, represented by 0 and 1. Therefore, we need to use the modulation method to convert the signal into 0 and 1 To facilitate the operation of the computer system. Moreover, due to the popularization of computer peripheral equipment and related electronic products, the scope of application of the above-mentioned modulation method is further expanded.

The conventional modulation method will be further described below by taking the optical information storage medium as an example. At present, the most common optical information storage media include compact disc (CD, Compact Disc) and digital audio-visual disc (DVD, Digital Versatile Disc). Data storage capacity. In addition, according to the recording characteristics of optical information storage media, it can be divided into read-only (CD-ROM, DVD-ROM), writable or re-writable (CD-R/RW, DVD-R/RW, DVD+ R/RW), random access (DVD-RAM) and other specifications. Regardless of the optical information storage media of the above specifications, there is a reflective layer in its structure to reflect the laser light, and judge the digital signal 0 and 1 according to the reflectivity difference of the laser light, and complete the analog signal (reflected light) The process of modulating digital signals (0 and 1).

Please refer to FIG. 1 , which is a three-dimensional view and a partially enlarged structure schematic diagram of a conventional recordable one-time optical disc. The existing conventional recordable optical disc 1 (CD-R) usually includes four layers of materials. The first layer is a substrate 11, which has a prefabricated groove 111 (Pre-groove) on the substrate 11 to facilitate addressing. The first layer is a recording layer 12 coated with organic dye (Dye), the third layer is a reflective layer 13 made of metal materials such as gold, silver, copper or aluminum, and the fourth layer is a protective layer 14 made of resin. When it is desired to record data on the recordable optical disc 1, laser light is used to irradiate the recording layer 12, so that the dye in the irradiated part is softened and deformed to form a plurality of signal holes 121 in the pregroove 111, so that the data can be stored. to form a record. Wherein, since the thermal reaction of the organic dye in the recording layer 12 is not reversible, it can only be recorded once.

Please refer to Fig. 2A and Fig. 2B. Fig. 2A is a partially enlarged structure schematic diagram of a known recordable one-time optical disc when reading data, and Fig. 2B is the reflectivity and A schematic diagram of a signal modulation method, which shows that the conventional recordable optical disc 1 reads data and utilizes the difference in reflectivity to perform signal modulation. When the user wants to read the data in the recordable optical disc 1, the laser light emitted by the reading device 2 (CD-Player's optical pickup head) will pass through the signal hole 121 on the substrate 11 and the recording layer 12 , and the laser light is reflected by the reflective layer 13, and the reflected light will then pass through the recording layer 12 and the substrate 11, and then the reading device 2 will receive the reflected light. Similarly, the laser light also passes through the non-signal holes 122 (not shown in the figure) on the substrate 11 and the recording layer 12 . Please refer to FIG. 2B , since the reflectivity of the laser light passing through the signal hole 121 and the non-signal hole 122 is different, the signal can be adjusted to 0 or 1 according to the reflectivity difference at different positions.

Based on the above, the existing conventional recordable optical disc uses different reflectivity when the laser irradiates the recording track on the dye recording layer to judge the digital signal 0 and 1 when performing signal modulation. But in this process, the laser needs to pass through several layers of materials in the optical disc, and the bonding interface of each layer of materials will affect the reflectivity, and the light will also be absorbed when passing through the medium to reduce the reflectivity, which will cause Misjudgment of the signal by the read head. Secondly, when organic dyes are used as the recording layer, unused dyes are not easy to recycle, which is very likely to cause environmental pollution. In addition, the laser needs to be limited to the use of lasers with specific wavelengths when reading. For example, CDs use lasers with a wavelength of 780nm, and the power of the laser light must be sufficient to ensure the reflectivity when reading, but too high power is too high. It is easy to damage the read head and reduce the life of the read head.

It can be seen that the above-mentioned existing information signal modulation method obviously still has inconveniences and defects in terms of method and use, and needs to be further improved urgently. Therefore, how to improve the above-mentioned shortcomings of the existing known modulation methods is one of the important issues for the future development of information signal modulation methods. In order to solve the problems existing in the information signal modulation method, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general method has no suitable modulation method to solve the above-mentioned problems. This is obviously a problem that relevant industry players are eager to solve.

In view of the defects in the above-mentioned existing information signal modulation methods, the inventor actively researches and innovates based on years of rich practical experience and professional knowledge engaged in the design and manufacture of such products, and cooperates with the application of academic theories, in order to create a new The information signal modulation method can improve the general existing information signal modulation method and make it more practical. Through continuous research, design, and after repeated trials and improvements, the present invention with practical value is finally created.

Contents of the invention

The purpose of the present invention is to overcome the defects existing in the existing information signal modulation method, and provide a new information signal modulation method, the technical problem to be solved is to make it possible to solve Information signal interpretation errors and environmental pollution problems are more suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. An information signal modulation method according to the present invention includes the following steps: polarizing a light source to obtain a linearly polarized light; causing the linearly polarized light to pass through an optically active substance; detecting the linearly polarized light passing through an optical rotation of the optically active substance; and interpreting the optical rotation to obtain a digital signal, wherein the optical rotation is greater than a value when the linearly polarized light passes through a first portion of the optically active substance, the digital signal is a first signal, and when the linearly polarized light passes through a second portion of the optically active substance, the optical rotation is less than the value, and the digital signal is a second signal, and the thickness of the first portion is greater than the The thickness of the second part.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

In the aforementioned information signal modulation method, when the optical rotation is greater than a value, the digital signal is the first signal.

In the aforementioned information signal modulation method, when the optical rotation is smaller than a value, the digital signal is the second signal.

In the aforementioned information signal modulation method, the optically active substance is set in an optical information storage medium.

In the aforementioned information signal modulation method, the optical information storage medium is an optical disc, or a digital audio-visual disc.

In the aforementioned information signal modulation method, the optically active substance has light transmission.

In the aforementioned information signal modulation method, the optically active substance is an organic compound or an inorganic compound.

In the aforementioned information signal modulation method, the optically active substance is quartz.

In the aforementioned information signal modulation method, the optically active substance is glucose or protein.

In the aforementioned information signal modulation method, a polarizer is used to detect the optical rotation.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. It can be seen from the above technical solutions that in order to achieve the above object, the information signal modulation method according to the present invention includes the following steps: first polarize a light source to obtain a linearly polarized light, and make the linearly polarized light pass through an optically active substance , and then detect the optical rotation of the linearly polarized light passing through the optically active substance and interpret the optical rotation to obtain a digital signal.

By virtue of the above-mentioned technical solution, the information signal modulation method of the present invention has at least the following advantages: Because the information signal modulation method of the present invention utilizes the property that optically active substances can change the optical rotation of polarized light, and then judges the optical rotation to obtain Digital signal, so the function of signal modulation can be achieved; and because the information signal modulation method of the present invention is modulated by optically active substances, it can improve the situation of signal error in the existing known modulation method, and Environmental pollution caused by the use of dyes can be avoided.

To sum up, the special information signal modulation method of the present invention can solve the problems of information signal interpretation errors and environmental pollution in the existing known modulation methods, and there is no similar design disclosure in similar modulation methods It is indeed an innovation if it is published or used, it has a great improvement in both method and function, it has made great progress in technology, and it has produced useful and practical effects, and it is better than the existing information signal tone The changing method has multiple effects of improvement, thereby being more suitable for practical use, and has extensive application value in the industry, and it is a novel, progressive and practical new design.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a perspective view and a partially enlarged schematic view of a conventional recordable optical disc.

FIG. 2A is a partially enlarged schematic view of a conventional recordable optical disc when reading data.

FIG. 2B is a schematic diagram of the reflectivity and signal modulation method of a conventional recordable optical disc.

FIG. 3 is a flow chart of an information signal modulation method according to a preferred embodiment of the present invention.

FIG. 4 is a structural perspective view and a partially enlarged schematic structural view of an information signal modulation method implemented in an optical information storage medium according to a preferred embodiment of the present invention.

FIG. 5A is a partially enlarged structural schematic diagram of an information signal modulation method according to a preferred embodiment of the present invention when reading data from an optical information storage medium.

FIG. 5B is a schematic diagram of the optical rotation and signal modulation method of the information signal modulation method implemented in the optical information storage medium according to the preferred embodiment of the present invention.

1: Recordable Disc 11: Substrate

111: Prefabricated groove 12: Recording layer

121: Signal hole 122: No signal hole

13: Reflective layer 14: Protective layer

2: Reading device 3: Recordable disc

31: Substrate 311: Prefabricated groove

31: Optically active material layer 321: Signal hole

322: No signal hole 33: Protective layer

4: Optical read-write head 5: Detection instrument

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation methods, steps, features and methods of the information signal modulation method proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. The functions are described in detail below, and the same components will be described with the same reference symbols.

First please refer to FIG. 3 , which is a flow chart of a method for modulating an information signal according to a preferred embodiment of the present invention. The method for modulating an information signal according to a preferred embodiment of the present invention includes the following steps: First, a light source is subjected to extreme Obtain a linearly polarized light (S01) after conversion, secondly, make the linearly polarized light pass through an optically active substance (S02), then detect the optical rotation of the linearly polarized light after passing through the optically active substance (S03) and Interpret the optical rotation to obtain a digital signal (S04). The following will be described respectively as follows:

In step S01, a linearly polarized light (Linearly Polarized light) is obtained after a light source passes through a polarizer. Generally speaking, we can obtain a linearly polarized light by using the polarization phenomenon generated by light passing through a polarizer (Polaroid) or a Nicol Prism (Nicol Prism).

In step S02, the linearly polarized light is transmitted through an optically active substance. When linearly polarized light penetrates a material with optical activity, the plane of polarization of linearly polarized light (Plane of Linearly Polarized light, also known as the plane of polarized light) will produce a deflection angle, which is called the material Optical Rotation. When polarized light passes through an optically active substance with a larger thickness (or a large number of molecules), its optical rotation is greater; when polarized light passes through an optically active substance with a smaller thickness (or a smaller number of molecules), its optical rotation degree is small. In the information signal modulation method of the preferred embodiment of the present invention, the optically active substance is quartz, of course, it can also be an organic compound with optically active properties, such as glucose or protein, or an inorganic compound.

In step S03, the optical rotation of the linearly polarized light passing through the optically active material at different positions is detected by a detection device. The detection instrument in the information signal modulation method of the preferred embodiment of the present invention is a polarimeter.

Finally, in step S04, the information signal is judged through the measured change in optical rotation. Compare the optical rotation measured according to the above steps with a numerical value, if the measured optical rotation is greater than the numerical value, define the signal represented by the optical rotation as a first signal; if the measured optical rotation is less than This value defines the signal represented by the optical rotation as a second signal. In this way, the procedure of modulating the analog signal (optical rotation) into a digital signal (the first signal and the second signal) is completed. In this preferred embodiment, the first signal and the second signal are, for example, 0 or 1, but not limited thereto.

In order to make the information signal modulation method of the present invention easier to understand, the following examples illustrate the specific implementation of the information signal modulation method of the preferred embodiment of the present invention applied to the optical information storage medium.

Please refer to FIG. 4, which is a perspective view of the structure of the information signal modulation method of the preferred embodiment of the present invention implemented in the optical information storage medium and a partially enlarged structural diagram, which shows the information signal modulation method of the preferred embodiment of the present invention. A three-dimensional view and a partially enlarged structural schematic diagram of a recordable disposable optical disc 3 that can be used as an optical information storage medium. The recordable optical disc 3 includes three layers of materials, including a substrate 31 , an optical active material layer 32 and a protective layer 33 . Among them, the substrate 31 has a plurality of pre-groove 311 (Pre-groove) to facilitate addressing, and the optically active material layer 32 is arranged on the substrate 31, and the data is written in the optically active material layer 32 above the pre-groove 311 On the other hand, the signal hole 321 is formed on the optically active material layer 32, causing the optically active material layer 32 to have different thicknesses at different positions such as the signal hole 321 and the non-signal hole 322, and the protective layer 33 is arranged on the optically active material layer 32 superior.

Please refer to FIG. 5A, which is a partial enlarged schematic diagram of the information signal modulation method of the preferred embodiment of the present invention when reading data from the optical information storage medium, showing the information signal modulation of the preferred embodiment of the present invention. The method can use a partially enlarged schematic diagram when reading data on the recordable optical disc 3 of the optical information storage medium. When wanting to read data, the optical read-write head 4 first emits polarized linearly polarized light. When the linearly polarized light passes through the signal hole 321 on the optically active material layer 32, the thickness of the optically active material layer 32 that it penetrates It is thinner, so the optical rotation measured by the detection instrument 5 on the other side of the optical disc is relatively small; and the thickness of the optically active material layer 32 that linearly polarized light penetrates when passing through the no-signal hole 322 is relatively thick, so the measured The obtained optical rotation is larger.

Please refer to FIG. 5B, which is a schematic diagram of the optical rotation and signal modulation method of the information signal modulation method of the preferred embodiment of the present invention implemented in the optical information storage medium, which shows the information signal modulation of the preferred embodiment of the present invention. The modification method can be applied to the signal modulation schematic diagram on the recordable optical disc 3 of the optical information storage medium. The detection instrument 5 compares it with a numerical value according to the change of the optical rotation detected at different positions such as the signal hole 321 and the non-signal hole 322, and if the measured optical rotation is greater than this numerical value, then define this The signal represented by the optical rotation is the first signal; if the measured optical rotation is less than this value, the signal represented by the optical rotation is defined as the second signal, thus completing the modulation of the analog signal (optical rotation) into Digital signal (first signal and second signal) procedure. In this preferred embodiment, the first signal and the second signal are, for example, 0 or 1, but not limited thereto.

Based on the above, because the information signal modulation method according to the present invention utilizes the characteristic that the optical rotation of polarized light can be changed by the optically active substance, and then interprets the optical rotation to obtain a digital signal, so the function of signal modulation can be achieved; and Since the information signal modulation method of the present invention is modulated by optically active substances, it can improve the situation of wrongly interpreting signals in the conventional modulation method, and can avoid environmental pollution caused by the use of dyes.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, may use the method and technical content disclosed above to make some changes or modifications to equivalent embodiments with equivalent changes, but if they do not depart from the technical solution of the present invention, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims (8)

1. An information signal modulation method, characterized in that it comprises the following steps: Polarizing a light source to obtain a linearly polarized light; transmitting the linearly polarized light through an optically active substance; detecting an optical rotation of the linearly polarized light passing through the optically active substance; and Interpret the optical rotation to obtain a digital signal, Wherein, when the linearly polarized light passes through a first part of the optically active substance, the degree of optical rotation is greater than a value, the digital signal is a first signal, when the linearly polarized light passes through a first part of the optically active substance When there are two parts, the optical rotation is smaller than the numerical value, the digital signal is a second signal, and the thickness of the first part is greater than the thickness of the second part. 2. The information signal modulation method according to claim 1, wherein said optically active substance is provided in an optical information storage medium. 3. The information signal modulation method according to claim 1, wherein said optical information storage medium is an optical disc or a digital audio-visual disc. 4. The information signal modulation method according to claim 1, wherein the optically active substance has light transmission. 5. The information signal modulation method according to claim 1, wherein the optically active substance is an organic compound or an inorganic compound. 6. The information signal modulation method according to claim 1, wherein the optically active substance is quartz. 7. The information signal modulation method according to claim 1, wherein the optically active substance is glucose or protein. 8. The information signal modulation method according to claim 1, wherein the optical rotation is detected by a polarimeter.

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