Source: http://www.google.com.tw/patents/US4642688
Timestamp: 2013-05-22 22:27:39
Document Index: 278952413

Matched Legal Cases: ['Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2', 'Application No. 2']

�M�Q US4642688 - Method and apparatus for creating encrypted and decrypted television signals - Google �M�Q�j�M �Ϥ� �a�� Play YouTube �s�D Gmail ���ݵw�� ��h »�i���M�Q�j�M | �������� | �n�J�i���M�Q�j�M�M�QA method and apparatus for creating a television signal and encrypting or decrypting the signal at the same time. Luminance and chrominance information are received by the apparatus and stored in separate television scan line stores. The stored liminance and chrominance information is read out from their...http://www.google.com.tw/patents/US4642688?utm_source=gb-gplus-share�M�Q US4642688 - Method and apparatus for creating encrypted and decrypted television signals���}��US4642688 A�X���������v�ӽЮѽs��06/736,301�o�G���1987�~2��10���ӽФ��1985�~5��21�� �u���v���1983�~6��24����L���}�M�Q��CA1332976CCN1005237BCN86103059AEP0223781A1EP0223781A4EP0223781B1WO1986007226A1�o��HJohn D. LowryKeith Lucas��M�Q�v�HScientific Atlanta, Inc.Scientific Atlanta, Inc., A Corp. Of GeorgiaDigital Video Systems Corporation A A Corp Of Canada ���M�Q������380/218348/E07.59380/217��ڱM�Q������H04N7/169H04NH04N7/167 �X�@����H04N7/1696 �ڬw������H04N7/169C�ѦҤ��m�M�Q�ޥ� (33)�D�M�Q�ޥ� (8)�Q�H�U�M�Q�ޥ� (45)�~���s�����M�Q�ӼЧ� ���M�Q�ӼЧ��M�Q����T�� �ڬw�M�Q��Method and apparatus for creating encrypted and decrypted television signalsUS 4642688 A�K�n A method and apparatus for creating a television signal and encrypting or decrypting the signal at the same time. Luminance and chrominance information are received by the apparatus and stored in separate television scan line stores. The stored liminance and chrominance information is read out from their respective stores at a frequency corresponding to a desired format or standard to create the television signal. The signal may be simultaneously encrypted or decrypted by delaying the time at which the luminance and/or chrominance information is read out in accordance with an encryption or decryption key.
We claim: 1. An apparatus for creating a MAC standard television signal and for encrypting said MAC signal at the time of its creation, said apparatus comprising: input means for receiving a scan line of luminance information, a scan line of color difference information and an encryption key; luminance storage means coupled to said input means for storing a scan line of said luminance information and subsequently reading out said stored line of luminance information to create said MAC standard signal, said luminance storage means including first and second memory means; and first and second clock signal means coupled to respective said first and second memory means, said first clock signal means being arranged to cause said first memory means to store a present scan line of said luminance information when said second clock signal means causes said second memory means to read out said stored scan line of luminance information, said second clock signal means being arranged to cause said second memory means to store a present scan line of said luminance information when said first clock signal means causes said first memory means to read out said stored scan line of luminance information, wherein said first and second clock signal means causes said first and second memory means to delay reading out said stored scan line of luminance information in accordance with said encryption key, said first and second clock signal means causes said respective first and second memory means to store a predetermined number of samples of said luminance information at a first predetermined sampling frequency and to read out sid stored scan line of luminance information at a second predetermined sampling frequency.
2. The apparatus of claim 1 wherein said predetermined number of samples is 750, said first predetermined sampling frequency is 14.32 MHz and said second predetermined sampling frequency is 21.48 MHz.
10. An apparatus for creating an NTSC standard television signal and for decrypting said NTSC signal at the time of its creation, said apparatus comprising: input means for receiving a scan line of luminance information, a scan line of color difference information and a decryption key; luminance storage means coupled to said input means for storing a scan line of said luminance information and subsequently reading out said stored scan line of luminance information to create said NTSC standard signal, said luminance storage means including first and second memory means; and first and second clock signal means coupled to respective said first and second memory means, said first clock signal means being arranged to cause said first memory means to store a present scan line of said luminance information when said second clock signal means causes said second memory means to read out said stored scan line of luminance information, said second clock signal means being arranged to cause said second memory means to store a present scan line of said luminance information when said first clock signal means causes said first memory means to read out said stored scan line of luminance information, wherein said first and second clock signal means causes said first and second memory means to delay reading out said stored scan line of luminance information in accordance with said decryption key, wherein said first and second clock signal means causes said respective first and second memory means to store a predetermined number of samples of said luminance information at a first predetermined sampling frequency and to read out said stored scan line luminance information at a second predetermined sampling frequency.
11. The apparatus of claim 10 wherein said predetermined number of samples is 750, said first predetermined sampling frequency is 21.48 MHz and said second predetermined sampling frequency is 14.32 MHz.
19. A method of simultaneously creating a MAC standard television signal by compressing luminance or color difference information and encrypting said MAC standard signal comprising the steps of: storing a predetermined number of samples of a scan line of luminance information in one line store at a first predetermined sampling frequency; and commencing reading out said stored scan line of luminance information from said one line store at a second predetermined sampling frequency after a time delay determined by an encryption key.
20. The method of claim 19 wherein said predetermined number of samples is 750, said first predetermined sampling frequency is 14.32 MHz, and said second predetermined sampling frequency is 21.48 MHz.
21. The method of claim 19 further comprising the steps of: storing a predetermined number of samples of a scan line of color difference information in a separate line store at said first predetermined sampling frequency; and commencing reading out said stored scan line of color difference information from said separate line store at said second predetermined sampling frequency after a time delay determined by said encryption key.
22. A method of simultaneously creating a decrypted NTSC standard television signal from an encrypted MAC signal by decompressing luminance or color difference information comprising the steps of: storing a predetermined number of samples of a scan line of luminance information in one line store at a first predetermined sampling frequency; and commencing reading out said stored scan line of luminance information from said one line store at a second predetermined sampling frequency after a time delay determined by a decryption key.
23. The method of claim 22 wherein said predetermined number of samples is 750, said first predetermined sampling frequency is 21.48 MHz, and said second predetermined sampling frequency is 14.32 MHz.
24. The method of claim 22 further comprising the steps of: storing a predetermined number of samples of a scan line of color difference information in a separate line store at said first predetermined sampling frequency; and commencing reading out said stored scan line of color difference information from said separate line store at said second predetermined sampling frequency after a time delay determined by said decryption key.
As discussed in commonly assigned pending application Ser. No. 652,926 filed Sept. 21, 1984, and herein incorporated by reference, the above-mentioned MAC standard was developed to overcome the problems associated with the NTSC standard. A MAC color television signal is illustrated in FIG. 11, which is an amplitude-vs.-time diagram of a single video line of 63.56 �gs duration. The first 10.9 �gs is in the horizontal blanking interval (HPI) 62, in which no picture information is transmitted. Following HBI 62 are chrominance signal 64 and luminance signal 66, either of which may be time-compressed. Between chrominance signal 64 and luminance signal 66 is a 0.28 �gs guard band 68, to assist in preventing interference between the two signals.
FIGS. 16a and 16b are diagrams illustrating the signals input and output from the line store of FIG. 12. To simplify the illustration from the line store of FIG. 12. To simplify the illustration and explanation, it is assumed that the line store is being used to compress a luminance signal, that the length of a standard scan line L is 64 �gs and that the length of the horizontal blanking interval is 12 �gs. Thus the length of the active or video portion of the scan line is 54 �gs. FIG. 16a represents the operation of memory element 33 while FIG. 16b represents the operation of memory element 34.
As shown in FIG. 16a, 750 samples of luminance are taken at a sampling frequency of 14.32 MHz over 52 �gs of the scan line and stored in memory element 33. After a delay in accordance with the encryption key, these samples ae read out at a sampling frequency of 21.48 MHz. The higher sampling frequency causes the samples to be read out much faster than they were read in, i.e., the incoming samples took 52 �gs to read in but only 34 �gs to read out. Therefore, compression of the incoming luminance singal is accomplished, thereby creating a luminance portion of MAC standard signals. Because readout of the samples is delayed in accordance with an encryption key, the MAC signal is also simultaneously encrypted. As can be seen from FIG. 16a, the length of the delay before reading out the stored samples can vary from 0 to 32 �gs. A delay longer than 32 �gs will not permit the samples to be completely read out prior to the arrival of a new scan line for storage.
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