Class 380/220 - Carrier frequency conversion

Subclass of Class 380 - Cryptography
Definition: Subject matter under subclass 210 in which the frequency
No. of patents: 38
Last issue date: 06/09/2009

Number	Title	Issue Date
7545938	Digital watermarking which allows tampering to be detected on a block-specific basis An apparatus for generating codes includes a quantization unit which generates quantization coefficients by performing discrete wavelet transform with respect to each of tiles into which an image is divided, a block division unit which divides the quantization coeff...	06/09/2009
7409060	Durable and undecipherable digital watermarking technique and detection of unauthorized use A digital watermarking technique is disclosed, in which image data are converted to frequency components through discrete wavelet transform and quantized into a set of quantized coefficients, which are then divided into a plurality of blocks. A digital watermark is ...	08/05/2008
7277557	Image processing apparatus, image processing method, and storage medium of image processing program A pattern generating section forms two patterns based on a pattern size, an embedding strength, and a pattern attenuation ratio. When corresponding pixels in two patterns are added to each other, all of elements become zero. When all of pixels in each of patterns ar...	10/02/2007
7272374	Dynamic selection of local oscillator signal injection for image rejection in integrated receivers A system and method are disclosed for dynamically selecting high-side injection or low-side injection of local oscillator mixing signals based upon an assessment of signal power within the input signal spectrum that could cause unwanted images in the processed signa...	09/18/2007
7253871	Efficient room-temperature source of polarized single photons An efficient technique for producing deterministically polarized single photons uses liquid-crystal hosts of either monomeric or oligomeric/polymeric form to preferentially align the single emitters for maximum excitation efficiency. Deterministic molecular alignmen...	08/07/2007
7194630	Information processing apparatus, information processing system, information processing method, storage medium and program A provider side apparatus provides original digital data together with a digital signature generated by the provider side apparatus, the digital signature detecting whether the original digital data was falsified or detecting a change level given to the original dig...	03/20/2007
7190807	Digital watermark extracting method, apparatus, program and storage medium The invention is to precisely extract a digital watermark from image data which are subjected to embedding of the digital watermark in a state of a binary image and are then converted into a multi-value image (gray scale image). For attaining the foregoing ob...	03/13/2007
7146008	Conditional access television sound A digitally encrypted audio signal may be transmitted with an analog television signal. Access to the analog television video signal may be controlled by using graphics overlay techniques. The use of digital encryption techniques on the audio channel prevents improp...	12/05/2006
7117514	Multi-tuner television receiving apparatus and method of restricting the viewing A process and network able to restrict a video appliance equipped with either a single tuner or with multiple tuners, from receiving and subsequently displaying video image signals represented by an accompanying broadcast discretionary control data to include a high...	10/03/2006
7086087	Information processing device, card device and information processing system It is a technological object of the present invention to provide an information processing device, a card and a card system that have a high level of security. In order to achieve the object described above, the present invention provides a data processing apparatus...	08/01/2006
6597789	Video/audio scrambling with single conversion tuners Conventional decoding systems for scrambled audio-visual signals are improved by providing a dual-side local oscillator that functions as a high-side oscillator if the incoming RF signal is unscrambled and as a low-side oscillator if the incoming RF signa...	07/22/2003
6519340	Method and apparatus for encryption using partial information A method and apparatus of encrypting optical images using binarization or phase only information is presented with a number of ways to secure the image also being provided. An image to be encrypted is first multiplied by a random phase function. The Fouri...	02/11/2003
5463656	System for conducting video communications over satellite communication link with aircraft having physically compact, effectively conformal, phased array antenna A system architecture and communication methodology for significantly reducing the size of an aircraft antenna required to provide full broadcast quality video communications with an aircraft via a satellite communications link includes a combination of v...	10/31/1995
5450454	Coding and decoding a modulated radio frequency signal The invention relates to a method for coding and decoding a radio frequency signal, modulated with a TV program or other message and transmitted from a transmitting center to a plurality of receiver locations, where the coding is effected by shifting, at ...	09/12/1995
5446795	Universal decoder for television signal scramble systems A universal decoder for scrambled television signals in which the signals are processed in a circuit by converting them to other frequencies and then removing the scrambling signal. One method uses one or more narrow filters at a fixed frequency with the ...	08/29/1995
5430798	Scrambled TV-IF signal transmission system A cable TV signal transmission system comprising a Nyquist filter carrier recovery circuit, a mixer, a level shifter and a pre-emphasis circuit for transmitting scrambled TV-IF signals on an FM or digital signal link to a receiver section comprising a de-...	07/04/1995
5311543	Television transmission system using two stages of spead-spectrum processing A 2-stage SS (spread-spectrum) system for transmitting a coded TV signal, said coded signal consisting of first components requiring near-perfect transmission and second components for which somewhat imperfect transmission is acceptable, wherein a first S...	05/10/1994
5301245	System for transmitting a commercial program in a CATV system A CATV system includes a broadcasting station, a satellite, and a local center. Scrambled television signals transmitted from the broadcasting station to the local center through the satellite are descrambled and re-scrambled at the local center, and the ...	04/05/1994
5235640	Master decoder for television signal scramble systems A master decoder for scrambled television signals in which the signals are processed in a circuit by converting them to other frequencies and then removing the scrambling signal. One method uses one or more narrow filters at a fixed frequency with the tel...	08/10/1993
5056139	Methods and apparatus for electronically limiting broadcast communication A communication receiver (12) is provided having a radio frequency section (20) for receiving a communication signal (14) and a corresponding code signal (16) carrying an identification code. An intermediate frequency section (26) is coupled to radio freq...	10/08/1991
5052047	Modulator-remodulator with common local oscilator A channel converter system includes a local oscillator for converting an input RF television channel frequency signal to an intermediate frequency and for remodulating the intermediate frequency signal to produce a channel output signal at the same freque...	09/24/1991
4951313	Scrambled frequency modulated video signal transmission system A scrambled frequency modulated video signal transmission system is provided with a headend station having a DC coupled amplitude demodulator for removing the amplitude modulation of a scrambled amplitude modulated baseband video signal. The low frequency...	08/21/1990
4864613	Broadband converter/descrambler interface for cable TV A broadband converter/descrambler intended for use with cable-ready video appliances (e.g., a VCR or television) receives signals from a cable TV drop. The cable TV signals are characterized by a plurality of scrambled and unscrambled TV channels. The scr...	09/05/1989
4827509	CATV receiver In a CATV receiver for receiving scrambled television signal, then de-scrambling it to original television signal responsive to key pulses contained in the scrambled television signal, and then outputting it at a predetermined frequency band, said receive...	05/02/1989
4823387	Television tuning system with provisions for tuning RF signals with scrambled video information A tuning system for tuning non-standard frequency RF signals which utilizes searches for non-standard RF signals by examining both a synchronization component and an AFT signal at each of a successive number of search frequencies. If the AFT signal indica...	04/18/1989
4771456	Cable television channel selector/descrambler for use with cable-ready video applicances A cable television channel selector/descrambler enables the full capabilities of a cable-ready video appliance (e.g., television set or VCR) to be used in conjunction with a cable television system providing unscrambled channels and scrambled premium chan...	09/13/1988
4589016	FM television signal receiving circuit A receiving circuit for receiving an FM-modulated television signal with an energy dispersal signal superposed thereon is used for a television receiver for receiving the FM-modulated television signal. The receiving circuit is provided with a triangle wa...	05/13/1986
4575753	Method of and apparatus for scrambling and decoding television and similar signals with wobbulating trapping Television or similar picture scrambling or the like wherein narrow trapping of the visual carrier is effected with one-direction FSK-FM modulated wobbulation of the visual carrier, preferably alternately at different multiples of the horizontal synchroni...	03/11/1986
4518993	Television signal receiving system A television receiver for receiving standard television channel signals and a scrambled television channel signal includes a channel selector which selects one of the television channel signals, a tuner which tunes the selected television channel signal, ...	05/21/1985
4509210	Television receiver adaptable for descrambler module A television receiver is adapted for use of standardized plug-in descramblers which are coupled to the receiver by a connector. The connector is accessible from the exterior of the housing of the receiver without significant disassembly. The connector has...	04/02/1985
4325078	Pay per view television control device An apparatus and method for providing limited access to broadcast television programming in a CATV System wherein each television subscriber is provided with a converter for converting broadcast television signals into signals suitable for reception and d...	04/13/1982
4286288	Apparatus and method for tamper resistant channel attenuation in subscription television converter A tamper resistant subscription television converter is made by connecting a bandstop filter in the Radio Frequency circuit of the converter. The filter, for attenuating one or more preselected subscription television channels is connected in series at a ...	08/25/1981
4253114	High security subscription television system employing real time control of subscriber's program reception A high security subscription television system which includes the feature of dynamic scrambling and descrambling of cable-connected television signals in response to real-time coded control signals. The system also has the ability to precisely tune the fr...	02/24/1981
4130833	Pay television system The standard composite television signal is modulated onto an intermediate frequency carrier signal. The so-modulated signal is applied to the input of a first and second frequency converter for conversion respectively to a first or second UHF or VHF outp...	12/19/1978
4109281	Terminal device for CATV In a CATV system, a received signal band containing video channels and a data signal at a selected frequency is successively converted in frequency so as to provide a chosen video signal at the frequency of a selected channel. After the first conversion a...	08/22/1978
4081831	High security subscription television system employing real time control of subscriber's program reception A high security subscription television system which includes the feature of dynamic scrambling and descrambling of cable-connected television signals in response to real-time coded control signals. The system also has the ability to precisely tune the fr...	03/28/1978
4079419	Method and apparatus for transmitting and receiving additional information in a television signal Identification of a program being transmitted is encoded digitally on a sub-carrier modulated on the sound carrier of a television signal with each elementary code group occupying a television field interval, the information being transmitted in cycles of...	03/14/1978
3997718	Premium interactive communication system A cable television and communication system is disclosed which is suitable for community antenna television (CATV) closed circuit television (CCTV) and other types of signal distribution systems with service function applications such as for use in hotel,...	12/14/1976

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Class 380/220 - Carrier frequency conversion