One dimensional holographic recording of electrical signals专利检索-信息检索数学与统计专利检索查询-专利查询网

One dimensional holographic recording of electrical signals

阅读：421发布：2023-09-20

专利汇可以提供One dimensional holographic recording of electrical signals专利检索，专利查询，专利分析的服务。并且The present invention is directed to a method of recording information, which is in the form of electrical signals, on a storage medium by simultaneously exposing the light sensitive storage medium with a light beam which is modulated with the electric signals to be recorded and a reference light beam to form a track of information in the form of holograms on the storage medium. The method further includes retrieving the information contained in the holograms of the track of information by projecting a light beam on the track of holograms to form a reconstructed image and detecting the information from the images with a photoelectric transducer which converts the information in the reconstructed images into electrical signals. In one embodiment of the invention, sound signals are recorded in a sound groove adjacent to the information track of holograms and are retrieved simultaneously with retrieving information from the hologram track of information. To retrieve information from this embodiment, a retrieval apparatus having a needle for retrieving information in the sound groove on an information retrieval head which includes a device for projecting the reading light beam and a photodetector for detecting information retrieved by the reading light beam. The needle of the sound head also functions to guide the reading light beam along the information track as the needle moves in the sound groove. The invention also relates to a storage medium having a sound groove for storing sound signals and an information track of holograms formed on a light sensitive surface thereof.，下面是One dimensional holographic recording of electrical signals专利的具体信息内容。

权利要求

1. In a method of storing information in an information track on a light sensitive storage medium by temporally modulating a light beam as a whole in response to information contained in the form of electric signals, projecting the modulated light beam on the storage medium while providing continuous relative movement therebetween to record the information in the information track and in which recorded information is retrieved with a reading light beam directed on the information track of the storage medium and a photo electric transducer for detecting information imparted to the reading light beam by the information track, the improvement in storing said information comprising simultaneously projecting a first coherent light beam modulated with the information to be recorded and a second reference light beam onto the storage medium, the step of projecting including focusing in a direction perpendicular to the track direction both the first and second beams so as to form one dimensional beams to jointly record a one dimensional hologram on the light sensitive storage medium in the track direction and synchronously pulsing the first and second coherent light beams as they are being projected onto the storage medium at a frequency which is at least twice as large as the upper cut-off frequency of the information being recorded.

2. In a method according to claim 1, wherein the modulation of the first light beam by the electrical signal is an amplitude modulation.

3. In a method according to claim 1, wherein the first light beam is polarized and the modulation of the first light beam by the electrical signal is by rotating the direction of polarization of the polarized first light beam.

4. In a method according to claim 1, wherein the storage medium is a tape and the relative movement between the storage medium and the first and second coherent light beams is provided by moving the tape relative thereto.

5. In a method according to claim 1, wherein the storage medium is rotated to provide a spiral shape track of information thereon during recording.

6. In a method according to claim 1, wherein the upper frequency limit of the information recorded by the first and second light beams is increased by electric distortion correction of the electrical signal used for modulation the first light beam.

7. In a method according to claim 1, wherein during retrieval, the reading light beam is one dimensionally focused in the direction of the recorded hologram dimension.

8. In a method according to claim 1, wherein the centers of the first and second coherent light beams during recording lie on a line extending perpendicular to the storage medium and the center of the reading light beam and the light beam with the information imparted from the information track each lie on a line which is perpendicular to the plane of the surface on which the hologram is recorded so that coma and astigmatism in the image reconstructed from the hologram is reduced.

9. In a method according to claim 1, further including the step of providing a sound groove on the storage medium and wherein the information track of one dimensional holograms is recorded in the base of the sound groove.

10. In a method according to claim 1, further including the step of providing a sound groove on the storage medium and wherein the information track of one dimensional holograms is recorded adjacent an edge of the sound groove.

11. In a method according to claim 1, wherein the information track of hologram is recorded in the form of a surface relief hologram.

12. In a method according to claim 11, wherein a surface relief hologram is recorded with mirror relief surfaces so that during Reading out, the reading light beam is reflected by the mirror relief surfaces to form a reflection of the reconstructed hologram image.

13. In a method according to claim 1, wherein during recording of storage medium, the wave length of the light beams used for recording is smaller than the wave length of the light beam used for reading out the recorded information.

14. In a method according to claim 1, wherein during retrieval of the information from the information track on the storage medium, the storage medium is illuminated with a coherent light beam to form a reconstructed image of the information which is stored in the hologram and the reconstructed image is projected onto a photoelectric detector whereby the information is converted to electrical signals.

15. In a method according to claim 14, wherein the reading light beam is a continuous beam producing a sampling frequency on the photoelectric detector and which method includes providing a low pass filter to remove the sampling frequency produced by the photo detector.

16. In a method according to claim 14, wherein the reading light beam is produced by a laser.

17. In a method according to claim 14, wherein the reading light beam is produced by a spectrum lamp with a narrow band interference filter.

18. In a method according to claim 14, wherein the reading light beam is produced by a luminescent diode with a narrow band interference filter.

19. In a method according to claim 1, wherein the storage medium is provided with a sound groove with information recorded therein and with the hologram track of information recorded adjacent thereto, and in which information recorded on the storage medium is retrieved simultaneously by a needle retrieving the information recorded in the sound groove and a reading light beam retrieving the information from the hologram track of information.

20. In a method according to claim 1, which further includes the step of recording an information signal in a groove on the storage medium simultaneously with the recording of information in the hologram track of information.

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One dimensional holographic recording of electrical signals

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