 Reactive sound absorber |
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| Tracking switchmode power converter for telephony interface circuit |
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| Digital BTSC compander system |
| OF THE INVENTION The BTSC Specification is intended to serve the industry in the form of ... |
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| Method and apparatus for spectral shaping in signal-point limited transmission systems |
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| Apparatus for facilitating the making of a calling card telephone call |
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| Loudspeaker unit adapted to environment |
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| Subband coded digital transmission system using some composite signals |
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| Low bit-rate high-resolution spectral envelope coding for audio encoder and decoder |
| I claim: 1. An encoder of one or more channels of input signals comprising signal samples, said ... |
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| Montgomery reduction apparatus |
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| Audio system for vehicular application |
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Scrambling type method and apparatus for video transmission/receipt
| Details |
Inventors: Itoi, Satoshi;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Swann; Tod R
Assistant Examiner: Coddington; Trevor Quick
Attorney, Agent or Firm: Whitham, Curtis & Whitham
A scrambling type video transmitting/receiving method feasible for digital television broadcasting and an apparatus therefor are disclosed. A video transmitter executes soft scrambling with an original video signal before compressing it and then sends the softly scrambled video signal. If a video receiver descrambles the scrambled data with a scramble decoder (descrambler), a subscriber having the receiver can enjoy complete video/audio data. However, when an unauthorized person lacking the scramble decoder decodes the descrambled data, the person is allowed to see only some patterns included in a picture. This will successfully encourage the unauthorized person to make subscription so as to enjoy the complete video/audio data. |
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DETAILED DESCRIPTION It is therefore an object of the present invention to provide a scrambling type video transmitting/receiving method feasible for digital TV broadcasting and urging unauthorized persons to enjoy complete video/audio data by making subscription.
In accordance with the present invention, in a method of transmitting/receiving a video produced by compressing an original video signal in the form of a compressed video signal, soft scrambling is executed with the compressed image signal in order to transmit the resulting scrambled signal as a signal to be transmitted.
Also, in accordance with the present invention, in a method of transmitting/receiving a compressed video signal produced by compressing an original video signal, soft scrambling is effected with the original video signal before compression.
Further, in accordance with the present invention, in a method of transmitting/receiving a compressed video signal produced by compressing an original video signal, main soft scrambling is effected with the original video signal before compression, and then auxiliary soft scrambling is effected with the compressed video signal to thereby send the resulting signal as a signal to be transmitted.
Furthermore, in accordance with the present invention, a video transmitter/receiver has a compressing circuit for compressing an original video signal to thereby output a compressed video signal, and a scrambling circuit for executing soft scrambling with the compressed video signal and sending the resulting signal as a signal to be transmitted.
Moreover, in accordance with the present invention, a video transmitter/receiver has a scrambling circuit for executing soft scrambling with an original video signal to thereby output a scrambled signal, and a compressing circuit for compressing the scrambled signal to thereby output a compressed video signal.
The compressed video signal is sent as a signal to be transmitted.
In addition, in accordance with the present invention, a video transmitter/receiver includes a main scrambling circuit for executing main soft scrambling with an original video signal to thereby output a main scrambled signal
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Audio Signal Processing 
