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| Portable bar adapted for mounting electronic equipment |
| OF THE PREFERRED EMBODIMENT Referring to FIGS. 1 and 2 the portable bar 10 has an L-shaped case 12 ... |
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| Ghost signal elimination circuit |
| It is an object of the present invention to provide a greatly improved device and circuit to ... |
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| Digital correlation apparatus as for a television deghosting system |
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| Video noise reduction system employing plural frequency bands |
| The video noise reduction system 10 of FIG. 1 reduces noise of luminance signals by subjecting ... |
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| Pitch control system |
| It is an object of the present invention to provide a pitch control system for suppressing the ... |
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| Telephone hook-up box |
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| Signal encoding and decoding method and device |
| It is an object of the present invention to provide a method and device for encoding and decoding ... |
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Source data compression and decompression in code symbol printing and decoding
| Details |
Inventors: Liu, Larry Lingnan;
Assignee: Intermec Corporation (Everett, WA)
Primary Examiner: Tarcza; Thomas H.
Assistant Examiner: White; Carmen D.
Attorney, Agent or Firm: Graham & James LLP
A coded symbol encoding and decoding system and method provides improved efficiency and security by compressing and/or encrypting data prior to encoding the data into a coded symbol symbology. Prior to encoding the data into the coded symbol symbology, the encoding portion of the system compresses and/or encrypts the data. If compression decreases the size of the data by a given threshold, the system encodes the compressed data. Otherwise, the system encodes the uncompressed data. An unused character in the encoded data is used as a flag to indicate whether the data was compressed and/or encrypted. The encoded data is then printed as a coded symbol pattern. Conversely, the decoding portion reads the printed pattern, decodes the resulting data, and if necessary, decompresses and/or decrypts the data. Use of an unused character in the encoded data to indicate whether the data was compressed and/or encrypted allows the system and method to be used with existing symbologies. Separating the compression and the encodation processes allows the system and method to adapt to advances in compression and encodation techniques. |
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DETAILED DESCRIPTION In accordance with the teachings of the present invention, a coded symbol encoding and decoding system provides data compression to reduce the size of a coded symbol.
By separating the data compression process and the data encoding process, the system is able to easily adapt to advances in both data compression and data encoding techniques.
The system also uses data encryption to prevent unauthorized use of the encoded data.
The system comprises two principal parts: an encoding portion and a decoding portion.
The encoding portion is comprised of a source coding control, an input control, a data encoder, and a printer.
The source coding control receives data from a data source, and controls compression and/or encryption of the received data.
The input control appends information to an encoded data stream indicating whether the data stream was compressed and/or encrypted, and if so, the type of compression and/or encryption.
The information is appended to the encoded data stream in such a way as to utilize existing symbology codes without the need to create a new code.
The data encoder encodes the data stream into data representing a coded symbol using a given symbology.
Finally, the printer prints the resulting coded symbol.
The decoding portion of the present invention reads the coded symbol printed by the printer, decodes the data, and displays the data.
The decoding portion of the present invention is comprised of a code reader, an interface control, a source decoding control, a data decoder, and a display device.
The code reader reads the coded symbol printed by the printer.
The interface control determines whether the data read by the code reader contains compression and/or encryption data.
The source decoding control decompresses and/or decrypts the data.
The data decoder decodes the coded symbol data.
Finally, the display device displays the decoded data.
A more complete understanding of the coded symbol encoding and decoding system will be afforded to those skilled in the art, as well as a realization of additional advantages and objects thereof, by a consideration of the following detailed description of the preferred embodiment
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Audio Signal Processing 
