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7580522 |
Digital video broadcasting receiver
A digital video broadcasting receiver comprising a first input for receiving a first transport stream of data (TS# 1 ) and a second input for receiving a second transport stream of data (TS# 2 ),...
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7558389 |
Method and system of generating a speech signal with overlayed random frequency signal
A method and apparatus utilizing prosody modification of a speech signal output by a text-to-speech (TTS) system to substantially prevent an interactive voice response (IVR) system from...
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7543148 |
Audio watermarking with covert channel and permutations
Audio signals, such as a music clip, are inserted with detectable watermarks. The inserted watermark can identify the content producer and provide a signature embedded in the audio signal and...
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7529941 |
System and method of retrieving a watermark within a signal
A system and method of retrieving a watermark in a watermarked signal are disclosed. The watermarked signal comprises odd and even overlapped blocks where the watermark is contained in the even...
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7475246 |
Secure personal content server
A local content server system (LCS) for creating a secure environment for digital content is disclosed, which system comprises: a communications port in communication for connecting the LCS via a...
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7451319 |
System and method of watermarking a signal
A system and method of generating a watermarked signal are disclosed. The system segments the signal into overlapping blocks using a window function and processes the overlapping blocks according...
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7376843 |
Remote control of VCR with electronic mail
A security apparatus and a security method for controlling electric devices by use of electronic mails. A modem receives an electronic mail sent from a sending side and stores the received...
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7257710 |
Additional-data embedding apparatus and additional-data embedding method
The present invention provides an additional-watermark embedding apparatus for embedding predetermined additional data into original data. The additional-watermark embedding apparatus includes an...
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7159118 |
Methods and apparatus for embedding and recovering watermarking information based on host-matching codes
The invention provides apparatus and methods for embedding and recovering watermarking information based on host-matching codes. A code selector provides codes to be embedded in the host signal....
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7146503 |
System and method of watermarking signal
A system and method of generating a watermarked signal are disclosed. The system segments the signal into overlapping blocks using a window function and processes the overlapping blocks according...
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7043019 |
Copy protection for digital motion picture image data
An apparatus and method for displaying a copy-deterrent pattern ( 104 ) within a digital motion picture in order to discourage recording of the motion picture using a video camera or other sampling...
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7020286 |
Modulation of dynamical systems for communication
A system for modulating and demodulating signals that provides a new class of signal modulators and their corresponding demodulators. The modulation scheme embeds in an information signal a carrier...
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7020285 |
Stealthy audio watermarking
Described herein is technology for inserting and detecting watermarks in signals, such as a music clip. In one described implementation, a watermarking system employs chess spread-spectrum...
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6937728 |
Verifiable anonymous channel
Two El Gamal ciphertexts, which are input to a two-input two-output unit switching gates SW forming a permutation network, are randomized with a random number and randomly permuted, and a...
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6697942 |
Method for remotely managing a remote device using an electronic mail message
A data formatting method for embedding diverse data types in an electronic mail message includes the step of forming a network compliant electronic mail message header. Command blocks representing...
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6690812 |
Watermark insertion and extraction into and from a high quality signal is performed using sample rate conversion
A high-quality signal, for example, a unity-bit coded (DSD) audio signal having a 2.822 MHz bit rate (fs1) is converted to a lower sample rate (fs3) PCM signal by a sample rate converter ( 102 )....
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6683958 |
Apparatus and method for embedding and extracting information in analog signals using distributed signal features and replica modulation
Apparatus and methods are provided for embedding or embedding digital data into an analog host or cover signal. A distributed signal feature of the cover signal in a particular domain (time,...
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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...
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6571144 |
System for providing a digital watermark in an audio signal
The foregoing problems are solved and a technical advance is achieved by a computer-implemented system for providing a digital watermark in an audio signal. In a preferred embodiment, a audio file,...
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6425082 |
Watermark applied to one-dimensional data
In the process of embedding watermark information in one-dimensional source data, first spread one-dimensional data x(t) is generated by subjecting one-dimensional source data s(t) to...
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6424925 |
Circuit and method for detecting a tone signal
A tone detector includes at least one circuit (hereinafter “single phase reference matcher”) that not only performs a convolution of an input signal with a reference signal, but also compares...
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6061793 |
Method and apparatus for embedding data, including watermarks, in human perceptible sounds
A technique for hiding of data, including watermarks, in human-perceptible sounds, that is, audio host data, is disclosed. In one embodiment a method comprises three steps. In the first step, data...
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5598471 |
Method and apparatus for encoding and decoding of audio transmission signals
A system for encoding and decoding an audio transmission signal comprises: (a) an encoder with a frequency-varying means to vary the carrier frequency of the audio signal according to an encryption...
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5528692 |
Frequency inversion scrambler with integrated high-pass filter having autozero to remove internal DC offset
A frequency inversion scrambler in a cordless telephone utilizes an integrated high-pass filter (14) between a first stage low-pass filter (12) and modulator (16) to reduce the filter order while...
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5471531 |
Method and apparatus for low cost audio scrambling and descrambling
Audio signals are descrambled by double sideband modulating the scrambled audio signal with a modulation carrier having a carrier frequency slightly above the highest audio signal present in the...
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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...
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5206908 |
Method and apparatus for detecting timing pulses for scrambled television system
A method and apparatus for detecting timing pulses for descrambling a scrambled television signal, wherein a video IF signal and a sound IF signal are separated from a scrambled television IF...
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5159631 |
Audio scrambling system using in-band carrier
Audio signals are scrambled by single side band modulating with a modulation signal carrier having a frequency lying within the audio frequency band so that the signals are frequency translated...
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5144666 |
Decoder to decode an encrypted sound
Decoder for encrypted sound signals which are encrypted by modulating the sound signals on an alternating carrier signal having a frequency which is generally unknown to receiving parties. A...
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5058159 |
Method and system for scrambling and descrambling audio information signals
Audio signals are scrambled by inverting the original; frequency spectrum so that frequency portions originally lying at the lower end of the audio frequency band are shifted to the upper end while...
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4956862 |
Method of providing sound privacy system compatible with mono and btsc stereo audio
In order to provide secure access to the audio portion of a television signal, the audio portion of a TV signal is modulated at a frequency that is offset from the standard carrier frequency. In...
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4922532 |
Sync suppression scrambling and descrambling of television signals for subscription TV
The quality of sound delivered to a subscriber viewing a channel which has been scrambled using sync suppression scrambling, particularly when the program is being transmitted with stereo sound, is...
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4910771 |
Television signal converter
A television signal converter includes a CATV tuner having a channel converting function, a gain changing circuit for descrambling the output from the CATV tuner and the like, in order to convert a...
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4908860 |
System for the secret transmission of audio signals and television receiver for receiving such signals
Encoding is realized by means of a first low-pass input filter (21), a first modulator (20), a second low-pass filter (19), a second modulator (18) whose modulating signal has a frequency which is...
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4659875 |
Electronic system for the secret transmission of audio signals
System for the secret transmission of audio signals having at one end a coding arrangement comprising an input low-pass filter which selects the secret audio signals to be transmitted, two parallel...
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4654705 |
Two channel audio scrambling system
A two channel audio scrambling circuit for a television signal encoding system includes synchronized digital carrier switching means for deriving two suppressed carrier, switched audio signals that...
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4638357 |
Audio scrambler
A method and apparatus are disclosed for scrambling and descrambling an audio signal. An interference signal is generated and is intermittently, preferably pseudo-randomly, added to the program...
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4636853 |
Dynamic audio scrambling system
A multi-mode audio scrambling system includes an all-pass filter and a 90 degree phase shift circuit for supplying balanced modulators with 90 degree phase displaced audio information and 90 degree...
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4586081 |
Method and apparatus for secure audio channel transmission in a CATV system
A secure audio channel transmission system method and apparatus in which an FM signal is generated on an FM broadcast frequency, such as 107.5 megahertz, divided in frequency by 2 and distributed...
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4581765 |
Information security system
A system is disclosed for encoding and decoding the audio signal portion of a television signal to prevent unauthorized reception of the audio signal. At the encoding stage, the audio signal is...
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4410911 |
Multiple signal transmission method and system, particularly for television
A method and system for scrambling a plurality of input signals for secure transmission thereof, as well as various methods and systems for television transmission, are disclosed. The disclosed...
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4222068 |
Subscription television apparatus and methods
Subscription apparatus and methods wherein an encoder begins inversion of a video signal during the last horizontal trace line of a randomly selected vertical interval and continues to invert trace...
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4148063 |
Method and apparatus for encoding audio signals in television systems
At the television transmitting end, the program audio signals to be encoded are limited to a range of 50 to 7,500 Hz. A 202 KHz signal is modulated by the so-limited audio signal and the resultant...
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4075660 |
Pay television system with synchronization suppression
Reference pulses of opposite polarity to the horizontal sync pulses are added to the composite television signal just preceeding each horizontal sync pulse. The video portion of the signal is...
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3936594 |
Secure television system
A secure system for television transmission wherein a television signal is transmitted on one frequency channel and a composite high fidelity stereophonic audio signal is transmitted on a separate...
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3826863 |
SUBSCRIPTION TELEVISION SYSTEM USING AUDIO AND VIDEO CARRIER REVERSAL
A subscription television system reverses the audio and video carriers within a particular channel on a random basis. A switching signal, nominally one Mhz beneath the video carrier, is transmitted...
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3824332 |
PAY TELEVISION SYSTEM
Reference pulses of opposite polarity to the horizontal sync pulses are added to the composite television signal just preceeding each horizontal sync pulse. The video portion of the signal is...
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3813482 |
METHOD OF AND APPARATUS FOR SCRAMBLE-ENCODED TRANSMISSION AND DECODED RECEPTION FOR OVER THE AIR AND CABLE SUBSCRIPTION TELEVISION AND THE LIKE
This disclosure deals with novel television or similar scrambling-decoding techniques for use in subscription television and the like (STV), involving the transmission of picture signals scrambled...
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3769448 |
AUDIO ENCODING/DECODING SYSTEM FOR CATV
In a Community Antenna Television (CATV) System, a system for hiding the audio portion of a television program from unauthorized television receivers connected to the CATV distribution system, is...
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3530232 |
SUBSCRIPTION TELEVISION SYSTEM
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