Scramble transmission apparatus and signal processing apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsNoboru Katta, Hiroki Murakami, Susumu Ibaraki, Seiji Nakamura
Life of this patent
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Abstract
The occurrence of malfunction on the reproduction side is avoided by preventing a scrambled signal from being coincided with a reserved word in the signal when a scramble process is carried out in order to release a transmission signal to specific users. The scramble process includes at least one of methods of (1) bit-inverting specified codes of the transmission signal code by code, (2) limiting bits to be scrambled from a specified position in the transmission signal, and (3) limiting codes to be scrambled to specific codes.
Claims46
A transmitting apparatus comprising a scramble processing apparatus and a descramble processing apparatus, wherein transmission data have a certain specific bit pattern therewithin as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for the particularly specified meaning,
- said scramble processing apparatus comprising a code detector for detecting a code existing at a prespecified position within the transmission data, and a bit inverter for bit-inverting the detected code, and
- said descramble processing apparatus comprising a code detector for detecting a code existing at the prespecified position, and a bit inverter for bit-inverting the detected code,
- the code existing at said prespecified position being a code which does not generate a bit pattern coincided with the reserved word even if any bit inversion is applied thereto.
A signal processing apparatus for processing data having a certain specific bit pattern therewithin as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for said particularly specified meaning,
- said signal processing apparatus comprising a code detector for detecting a code existing at a prespecified position within the data, and a bit inverter for bit-inverting the detected code,
- the code existing at said prespecified position being a code which does not generate a bit pattern coincided with the reserved word even if any bit-inversion is applied thereto.
A scrambling method for scrambling data having a certain specific bit pattern within the data as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for said particularly specified meaning,
- said scrambling method comprising the steps of detecting a code which exists at a prespecified position and does not generate a bit pattern coincided with the reserved word within the data even if a bit-inversion is applied, and bit-inverting the detected code.
A descrambling method wherein data have a certain specific bit pattern therewithin as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for the particularly specified meaning and a scrambled signal obtained by bit-inverting a code existing at the prespecified position and not generating a bit pattern coincided with the reserved word even if a bit-inversion is applied is descrambled, said descrambling method comprising the steps of detecting a bit-inverted code within the scrambled signal, and bit-inverting the detected code.
A transmitting apparatus comprising a scramble processing apparatus and a descramble processing apparatus, wherein transmission data have a certain specific bit pattern therewithin as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for the particularly specified meaning,
- said scramble processing apparatus comprising a code detector for detecting a prespecified position within the transmission data, and a scrambler for scrambling a data existing within plural bits from the prespecified position and not coincided with the reserved word when scrambled, and
- said descramble processing apparatus comprising a code detector for detecting the prespecified position, and a descrambler for descrambling a scrambled data existing from the detected position.
A signal processing apparatus for processing data having a certain specific bit pattern as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for the particularly specified meaning,
- said signal processing apparatus comprising a code detector for detecting a prespecified position within the data, and a scrambler for scrambling a data existing within predetermined plural bits from the detected position and not coincided with the reserved word when scrambled.
A transmitting apparatus comprising a scramble processing apparatus and a descramble processing apparatus, said scramble processing apparatus having a scrambler for scrambling a prespecified code, said descramble processing apparatus having a descrambler for descrambling the prespecified code, and said prespecified code being a code not to generate a bit pattern coincided with a reserved word within a transmission data even if a scrambling process is applied thereto.
A scramble transmission method for performing a scramble process on its transmission side and a descramble process on its reception side, wherein transmission data have a certain specific bit pattern therewithin as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for the particularly specified meaning,
- said scramble process comprising the steps of detecting a code for detecting a specified position within the transmission data, and scrambling a data within plural bits from the detected position and not coincided with the reserved word when scrambled, and
- said descramble process comprising the steps of detecting the specified position, and descrambling a scrambled data at the detected position.
A scrambling method for scrambling data having a certain specific bit pattern therewithin as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for the particularly specified meaning,
- said scrambling method comprising the steps of detecting a specified position within the data, and
- scrambling a data existing within predetermined plural bits from the detected position and not coincided with the reserved word when scrambled.
A descrambling method wherein transmission data have a certain specific bit pattern therewithin as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for the particularly specified meaning, and a scrambled signal obtained by scrambling a data within plural bits not coincided with the reserved word when scrambled from a prespecific position within the transmission data is descrambled,
- said descrambling method comprising the steps of detecting a position of a prespecified code within the scrambled signal, and descrambling a scrambled bit at the detected position.
A transmitting apparatus comprising a scramble processing apparatus and a descrambling apparatus, wherein transmission data have a certain specific bit pattern as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for the particularly specified meaning,
- said scramble processing apparatus comprising a code detector for detecting a prespecified code within the transmission data, and a converter for converting the detected code into a different bit pattern, said prespecified code being a code not generating a bit pattern coincided with the reserved word even if a converting process is applied,
- said descramble processing apparatus comprising a code detector for detecting the prespecified code, and a converter for descrambling a scrambled data in the detected code.
A signal processing apparatus for processing transmission data having a certain specific bit pattern as a reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain some specific bit pattern except for the particularly specified meaning, said signal processing apparatus comprising a code detector for detecting a prespecified code within the transmission data, and a converter for converting the detected code into a different bit pattern, and said prespecified code being a code not generating a bit pattern coincided with the reserved word even if a converting process is applied.
A scramble transmission method for performing a scramble process on its transmission side and a descramble process on its reception side, wherein transmission data have a certain specific bit pattern as as reserved word reserved as a code having a particularly specified meaning and data rules specified so as not to generate the certain specific bit pattern except for the particularly specified meaning,
- said scramble process comprising the steps of detecting a prespecified code, and converting the detected code into a different bit pattern, and
- said descramble process comprising the steps of detecting a prespecified position within the transmission data, and descrambling a scrambled data at the detected position.
Dependencies are inferred from the claim text.