Dynamic magnetic information storage or retrieval – Record editing
Reexamination Certificate
1995-06-07
2001-10-09
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Record editing
Reexamination Certificate
active
06301065
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to a method of encoding a signal and then digitally recording and reproducing the same.
2. Description of the Prior Art
Various devices exist for encoding and recording and reproducing video and audio signals. Further, it has been proposed to provide apparatus for encoding and recording and/or reproducing video and/or audio signals and which includes a servo system, a system controller and mechanical structures necessary for that purpose, and which may be alternatively employed for recording and reproducing computer data or the like other than video or audio signals. For example, an apparatus for recording and reproducing audio signals of the DAT format has also been proposed for recording and reproducing computer data.
In such DAT apparatus, a main data area includes 2 ID areas each of 2 bits (that is, a total of 4 bits) positioned in each synchronizing period. Included in these ID areas is a 2-bit format ID which indicates whether the recorded signal is in the DAT audio format or in the DDS format, that is, the format of a data streamer using DAT. In the DAT apparatus, each oblique track on the recording tape has subcode areas on its opposite end portions. Data ancillary to the audio or computer data recorded in the main data area of the track are recorded in and reproduced from the subcode areas. However, the format ID is not recorded in the subcode areas. In other words, in the DAT apparatus, the format ID recorded in the ID areas of the main data area determines whether data recorded in such main data area is an audio signal or computer data.
The rapidly developing so-called “digital world”, that is, the wide spread employment of digital devices for performing many different functions, makes apparent the desirability of providing a digital platform that can be used in common for different kinds of digital data. The DAT and DDS are examples of such a digital platform. However, the format ID of the conventional DAT apparatus is comprised of only 2 bits. Since two of the possible combinations of these 2 bits have already been employed for identifying the DAT audio format and the DDS or data streamer using DAT, respectively, the further expansion of the applications of the DAT apparatus as a digital platform is severely limited.
OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is an object of this invention to provide a method for recording and reproducing various types of data in such a manner as to permit the use of the same mechanical and servo systems and at least some of the same electrical components for such purposes.
In accordance with an aspect of this invention, in a method for recording and reproducing information signals in a track on a recording medium, a timing area is provided in the track for defining an after-recording area in a recording format, and an identification signal is added to such timing area and stipulates a data structure for the entire track.
In accordance with another aspect of the invention, in a method for recording and reproducing encoded signals in respective areas of a track on a recording medium, a recording format is provided which includes spaces for data which are ancillary to the encoded signals and which are recorded and reproduced simultaneously with the encoded signals, and there are added, in the spaces for the ancillary data, identification signals which stipulate the data structure of the encoded signals as recorded in the respective areas of the track.
According to still another aspect of the invention, in a method for recording and reproducing information signals, a memory is provided for storing data characterizing the recorded information signals, and there is stored, at a predetermined location in the memory, an identification signal which stipulates a structure of data in the memory. Such memory is desirably contained in a cassette which further contains a tape or other recording medium on which the information signals are recorded in a track, and there is further recorded in the track an additional identification signal which stipulates a data structure for the track and which is desirably the same as the identification signal stored in the memory in the cassette (MIC).
Furthermore, it is a feature of this invention that, when the identification signal provided in the timing area at the entrance end of a track stipulates a data structure for that track in which additional areas are provided in succession for the recording of the information signals and data ancillary thereto, there are further added to the ancillary data in the additional areas respective additional identification signals which stipulate data structures for the information signals recorded in the respective additional areas.
By reason of the foregoing aspects and features of the methods embodying the invention, it is made possible to produce commercial products for recording and reproducing different types of data, and which have in common certain mechanisms and servo systems, and also certain electrical circuit components.
The above, and other objects, features and advantages of the invention, will be apparent in the following detailed description of preferred embodiments when read in connection with the accompanying drawings.
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Frommer William S.
Frommer Lawrence & Haug LLP.
Hudspeth David
Kessler Gordon
Sony Corporation
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