摘要:
A method and system for decoding and storing encoded control data delivered via the horizontal overscan area of a video signal. An interactive device such as a toy performs behavior defined by control data that can be encoded into a video signal. The toy is equipped with a decoder for extracting data from the horizontal overscan portion of the video signal, and a non-volatile memory that permits the control data to be stored for use after the video signal is no longer being received. The control data are delivered as a series of words that include genus codes and sequence codes. Genus codes identify the specific toy to which the word is directed, as more than one toy may receive the video signal. Error grading is used to minimize the effect of such signal deterioration, so the toy will replace previously received words if newer words are of higher quality.
摘要:
The adaptive timing module is configured for recovering data encoded in a field of a video signal, and further configured for counteracting horizontal phase or picture shift. An adaptive timing processor defines a timing window where the expected prescan portion video signal is expected to be in an encoded video signal. The timing window is divided into sub-portions with a set of sampling points. The adaptive timing processor conducts a sweeping operation over each sub-portion of the prescan portion of the encoded video signal for the presence of a pre-data encoding zone. When a pre-data encoding zone is detected, the adaptive timing processor stores the position of the sub-portion with the pre-data encoding zone, or sets a flag to indicate the presence of a pre-data encoding zone for that particular sub-portion in a particular field. After scanning one or more fields for the presence of a pre-data encoding zone, the adaptive timing processor uses the stored positions of pre-data encoding zones, or uses the flags indicating the pre-data encoding zones to determine a selected sampling point. The adaptive timing processor uses the selected sampling point to lock on to a location for decoding subsequent data in the encoded video signal.
摘要:
An interactive display system is provided for use with (i) a program source having an associated video output signal and a digital data stream, the digital data stream being modulated on the video output signal, and (ii) a monitor in communication with the program source for displaying the output, the display system. The system in a preferred embodiment has a data decoder, for separating the digital data stream and a viewer control box. The control box has a user input for receiving user selections, a data input in communication with the data decoder for receiving the digital data stream, and a program execution module in communication with the user input and the data input. A video cassette for use in such a system is also provided.
摘要:
A method and apparatus for decoding data encoded in the horizontal overscan portion of a video signal. A video data detector is configured to decode data encoded in a video signal in a first type of video signal format, such as NTSC. When the detector receives the video signal, it enters a “fast acquisition” loop in which it attempts to decode a sequence of valid data from several consecutive frames of the video signal. If the detector cannot decode a sequence of valid data from the consecutive frames of the video signal, the detector is reconfigured to decode data encoded in the video signal in a second type of video signal format, such as PAL. The detector then attempts to decode a sequence of valid data from the next several consecutive frames of the video signal. If the detector is unable to decode a sequence of valid data from the consecutive frames, the detector is reconfigured for the first type of video signal format and the above process repeats. If the detector decodes a sequence of valid data in the several consecutive frames of the video signal, the detector enters a “controlled persistence” loop. In the controlled persistence loop, the detector continues to decode data until it fails to decode valid data from a series of consecutive video frames. When the detector fails to decode data from a series of consecutive video frames, the detector reenters the fast acquisition loop.
摘要:
Therefore, the object of the invention is to utilize the unused channel capacity of the television channel even more optimally for additional signals. Both on the transmitting, as well as the receiving side, the clock pulses for video and audio data to be additionally transmitted are generated from the FBAS useful signal by counting, weighting and decision-making, both signals being separately digitized, buffered, and compressed before being superimposed upon on the useful video signal. Subsequent to the same clock pulse generation, the steps follow in the reverse order on the receiver side. The implementation can be carried out on the transmitter side using additional equipment, on the receiver side by computer software or additional devices installed in the conventional TV set. The application can be carried out for any additional video and sound signals. A preferred special application is a community picture broadcast similar to a slide presentation.
摘要:
A data transmission apparatus and a camera system for multiplexing serial data into horizontal blanking portions of video data for transmission between a CHU (1) and a CCU (2). On the transmitting side, resampled data is obtained by sampling the serial data using a clock signal of a frequency higher than that of the transmission rate of the serial data. A predetermined number of resampled data items are selected as multiplexing data from the resampled data obtained in each of the horizontal periods of the video data. The multiplexing data is multiplexed into the horizontal blanking portions of the video data for transmission. On the transmitting side, the multiplexing data is separated from the received video data. The separated multiplexing data is decoded so as to extract successively definite data constituting the initial serial data.
摘要:
A bidirectional cable television system provides for transmission of signals from cable subscribers downlink in the same direction as the ensemble of television channels which the cable television system is already constructed to deliver. The subscriber signals may be transmitted over the cable in the blanking intervals of a cable television channel, using the T-NET technique described in U.S. Pat. No. 4,750,036. Alternatively, the signals may be carried over a dedicated channel, or transmitted cochannel along a cable television channel carrying ordinary programming by adding the subscriber information to alternating video frames in alternating polarity to achieve visual cancellation. The subscriber signals are collected after the last distribution line amplifier in the cable downlink. The collected signals are transmitted to a central receiver via wireless or other customary means such as a modem. The collected signals may alternatively be transmitted over the air to the central receiver in the blanking intervals of a broadcast television channel using the T-NET technique.
摘要:
A bidirectional cable television system provides for transmission of signals from cable subscribers downlink in the same direction as the ensemble of television channels which the cable television system is already constructed to deliver. The subscriber signals may be transmitted over the cable in the blanking intervals of a cable television channel, using the T-NET technique described in U.S. Pat. No. 4,750,036. Alternatively, the signals may be carried over a dedicated channel, or transmitted cochannel along a cable television channel carrying ordinary programming by adding the subscriber information to alternating video frames in alternating polarity to achieve visual cancellation. The subscriber signals are collected after the last distribution line amplifier in the cable downlink. The collected signals are transmitted to a central receiver via wireless or other customary means such as a modem. The collected signals may alternatively be transmitted over the air to the central receiver in the blanking intervals of a broadcast television channel using the T-NET technique.
摘要:
An audio receiver FIFO memory buffer in the serial digital video interface allows improved timing synchronization between video and audio information. Furthermore, it eliminates unpleasant sound effects when multiple data samples are skipped or repeated in series. This FIFO receiver buffer receives data at an input write-data rate filling up the memory storage cells therein. An output read-data signal clocks the data out of the memory storage cells. The FIFO's fullness is monitored and maintained, in response to an external signal, to within a specified range delimited by an upper and a lower threshold. If the FIFO buffer fullness is below the range's lower threshold, then the FIFO's read address pointer is held so that the immediately preceding read out data element is read out again, but only once. On the other hand, the FIFO buffer fullness is over the range's upper limit, then the FIFO's write address pointer is held so that the immediately preceding written in data element is written over, but only once.
摘要:
Query signals are transmitted by wireless means from the television station to the television set. Response units at receiver locations have a radio frequency transmitter send a response to the station inquiry sent on horizontal lines of the T.V. signal at controlled times identifying each station. This response is a simple r-f beep synchronized with the T.V. signal, in such a way that each set transmitter emits the beep only in its unique time slot. Simplified response units are tuned to the standard intermediate frequency of the T.V. sets and thus need not be wired in and need not have a channel selector.