Signal processing apparatus selecting a scrambled signal having a desired DC component from among a plurality of scrambled signal obtained by scrambling an input-data signal with respective pseudo-random signals
First Claim
1. An apparatus for processing an input data signal comprising:
- generator means for generating a plurality of pseudo-random signals;
scramble means coupled to said generator means for scrambling the input data signal by each of said plurality of pseudo-random signals and thereby providing a plurality of respective outputs;
detector means for detecting variation of a DC component for each of said outputs of said scramble means;
selector means controlled by said detector means for selecting one of said outputs of said scramble means exhibiting a desired DC component;
means for adding to said one output selected by said selector means an identifying signal which identifies the pseudo-random signal used in scrambling said one selected output of the scramble means; and
means for transmitting a signal comprised of said one output selected by said selector means together with said identifying signal.
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Abstract
An apparatus for processing an input data signal has a generator providing a plurality of pseudo-random signals each of which scrambles the input data signal for providing a plurality of respective scrambled outputs, a detector by which a DC component, such as, a run-length or a digital sum value, is detected for each of the scrambled outputs, and a selector responsive to the detector for selecting one of the scrambled outputs, for example, having a minimum run-length or a digital sum value closest to zero. An identifying signal identifying the pseudo-random signal used in scrambling the selected scrambled output is then transmitted with the latter, for example, by recording on a magnetic tape. When the transmitted signal is received or reproduced, the identifying signal included with it is detected, and the received signal is descrambled with a pseudo-random signal corresponding to the detected identifying signal.
46 Citations
8 Claims
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1. An apparatus for processing an input data signal comprising:
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generator means for generating a plurality of pseudo-random signals; scramble means coupled to said generator means for scrambling the input data signal by each of said plurality of pseudo-random signals and thereby providing a plurality of respective outputs; detector means for detecting variation of a DC component for each of said outputs of said scramble means; selector means controlled by said detector means for selecting one of said outputs of said scramble means exhibiting a desired DC component; means for adding to said one output selected by said selector means an identifying signal which identifies the pseudo-random signal used in scrambling said one selected output of the scramble means; and means for transmitting a signal comprised of said one output selected by said selector means together with said identifying signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for processing an input data single comprising:
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generator means for generating a plurality of pseudo-random signals; scramble means coupled to said generator means for scrambling the input data signal by each of said plurality of pseudo-random signals and thereby providing a plurality of respective outputs; first detector means for detecting variation of a DC component for each of said outputs of said scramble means; selector means controlled by said first detector means for selecting one of said outputs of said scramble means exhibiting a desired DC component; means for adding to said one output selected by said selector means an identifying signal which identifies the pseudo-random signal used in scrambling said one selected output of the scramble means; means for transmitting a signal comprised of said one output selected by said selector means together with said identifying signal; receiver means for receiving a signal transmitted by said means for transmitting; second detector means for detecting said identifying signal in the received, transmitted signal; local pseudo-random signal generating means for generating local pseudo-random signals; and de-scramble means for de-scrambling the received signal in accordance with one of said local pseudo-random signals corresponding to the detected identifying signal.
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8. An apparatus for processing an input data signal comprising:
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generator means for generating a plurality of pseudo-random signals; scramble means for scrambling the input data signal by each of said plurality of pseudo-random signals and thereby providing a plurality of respective outputs; precoder means for encoding each of said outputs of said scramble means to have a predetermined frequency characteristic, including a plurality of partial response encoders each comprising feedback circuit means having a delay for encoding a respective output of said scramble means in accordance with a partial response method, and switching means for providing, as a feedback to one of said partial response encoders, an output signal of another of said partial response encoders; detector means for detecting variation of a DC component for each of said outputs of said scramble means; selector means controlled by said detector means for selecting one of said outputs of said scramble means exhibiting a desired DC component; means for adding to said one output selected by said selector means an identifying signal which identifies the pseudo-random signal used in scrambling said one selected output of the scramble means; and means for transmitting a signal comprised of said one output selected by said selector means together with said identifying signal.
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Specification