 Contrast/brightness control circuit for television receiver |
| It is, therefore, an object of the present invention to provide a television receiver which ... |
|
| System for the real-time scheduling and loading of look-up tables for a patterning device |
| I claim: 1. A method for processing digitally encoded pattern information for use in a patterning ... |
|
| Apparatus and method for retrieving information using standard objects |
| OF PREFERRED EMBODIMENT As a general overview, document manager uses a standard-set of objects. T... |
|
| System for controlling a serial data channel with a microprocessor |
| Having thus described our invention, what we claim as new, and desire to secure by Letters Patent ... |
|
| Method and apparatus for positioning a transducer using embedded servo track encoding |
| In the present invention, all the servo information necessary for both the track accessing and ... |
|
| Head positioning servo for disk drives |
| There is disclosed a positioning apparatus for positioning a magnetic head in a disk drive ... |
|
| Open loop acceleration/deceleration control for disk drive stepper motors |
| In accordance with the present invention, there is a relatively inexpensive, but efficient open ... |
|
|
Data processing device for FM multi-channel broadcasting
| Details |
Inventors: Kimura, Kazuhiro; Hayashibe, Shigeaki; Ozawa, Toshiyuki; Hiramatsu, Tatsuo; Tomida, Yoshikazu;
Assignee: Sanyo Electric Co., Ltd. (Osaka, JP)
Primary Examiner: DeCady; Albert
Assistant Examiner: Iqbal; Nadeem
Attorney, Agent or Firm: Loeb & Loeb LLP
A scrambling key is generated from demodulated and error-corrected FM demodulation data for use in descrambling. During this process, if error correction has not been normally conducted to an object data packet, a subsequent descrambling operation is not executed to that data packet. In addition, a descrambling operation is not carried out if the object data packet is a parity packet. |
|
DETAILED DESCRIPTION The present invention was conceived to overcome the above problems and thus aims to provide a data processing device for FM multi-channel broadcasting which is capable of appropriately executing data processing, such as descrambling.
According to the present invention, there is provided a data processing device for FM multi-channel broadcasting, comprising: judgement means for judging whether or not it is necessary to execute data processing to an object data packet; and process prohibition means for prohibiting execution of data processing when the judgement circuit judges that it is unnecessary to execute data processing to the object data packet.
As described above, data processing is not executed to an object data packet which does not require data processing, so that useless data processing can be avoided.
In addition, unnecessary processing of usable intact data which may thereby become unusable can be prevented.
For instance, it is possible to prevent a situation where data which is not originally scrambled is descrambled and made unusable.
According to one aspect of the present invention, there is provided a data processing device for FM multi-channel broadcasting comprising error correction judgement means for judging whether error correction has been successfully or erroneously made to an object data packet, and process prohibition means for prohibiting execution of data processing when the error correction judgement means judges that error correction has been erroneously made to the object data packet.
Processing an invalid data packet with erroneously corrected errors cannot provide valid data.
Thus, execution of data processing to such an invalid data packet is unnecessary.
According to the present invention, the process prohibition means can prohibit process execution to data without the need of being processed, so that power consumption for data processing can be conserved.
Further, the error correction judgement means can easily judge whether error correction has been successfully or erroneously made, based on a status code which has been attached to the data packet according to the result of detection using a CRC code of FM multiplex data
|
|
I/O Systems 
