摘要:
This invention relates to an apparatus for descrambling scrambled television signals including a scrambled video signal having a first scrambling pattern, a scrambled control signal having a second scrambling pattern, and descrambling signals.
摘要:
A television signal transmission system transmits a television signal having a polarity inverted portion in association with a scene change and a polarity inverted portion after a predetermined time interval independently of the scene change.
摘要:
An apparatus for scrambling or encoding a television signal by inverting the latter signal in accordance with a control signal having a predetermined code pattern comprises a detector circuit for detecting a change in a picture scene of the television signal and generating an identification signal in response to detection of the scene change and code generator for generating a key code signal of specific pattern which indicates a particular program of the television signal. According to this invention, the control signal is formed in response to both the identification signal and the key code signal.
摘要:
A video recorder for automatically recording information being broadcast on at least one predetermined channel at a predetermined time comprises a tuner which tunes to any one of a plurality of channels received thereby and includes a channel selector actuable for selecting the predetermined channel, a recorder operable to record information broadcast on the channel to which the tuner is tuned, a timer actuable to cause operation of the recorder at the predetermined time, and a single, manually operable actuating member which simultaneously actuates the channel selector and the timer so that the recorder records the information broadcast on the predetermined channel at the predetermined time.
摘要:
A scrambled television program that is received and recorded in a scrambled fashion includes program code and corresponding key codes for use in descrambling the recorded scrambled signal. The program codes and key codes are retained in a memory so that upon reproduction the key code can be read out of the memory and fed to a descramble pattern generator for descrambling the reproduced scrambled signal. By placing the program code and key code at the end of the scrambled program the scrambled signal cannot be descrambled until the entire program has been first received. By dividing the memory into permanent and temporary memories and adding an identification code to the transmitted scrambled signal, which selects either the permanent or temporary memory, and counting the number of times that the temporary memory is read out there can be a limitation placed on the number of times that the scrambled program is reproduced and decoded for viewing. Once a selected number is reached the contents of the temporary memory are erased, thereby preventing descrambling of the reproduced signal.
摘要:
A television signal receiving system for use with a scrambled television signal or a standard television signal includes a recording and reproducing circuit which records and reproduces the received television signal and a monitor for displaying the received or reproduced television signal. A descrambling circuit descrambles the scrambled television signal either as received or reproduced to generate a descrambled television signal when a detector detects the existence of a scrambled television signal and generates a control signal in response thereto. A switch responds to the control signal and automatically supplies to the monitor either the descrambled television signal or the standard television signal according to the type of television signal being received or reproduced.
摘要:
A scrambled television program is received and recorded in a scrambled fashion automatically in a video tape recorder by detecting program code signals placed in vertical blanking intervals of ten fields preceding the commencement of the scrambled program signal and upon sensing such program code signals the video tape recorder is activated to record the scrambled television program. A stop code signal is arranged following the coded television program and is detected for stopping operation of the video recorder, so that the scrambled program is recorded without requiring the manual setting of automatic timers or the like. In addition to the program code, a key code, and scene change signals are transmitted and these are used to produce a descramble pattern to descramble the television program when it is reproduced by the video tape recorder. By placing the key code after the television program, the entire program must be recorded in scrambled form before it can be reproduced and descrambled for viewing, thereby automatically recording the scrambled program without requiring a timer.
摘要:
An arrangement and a method for testing various kinds of electronic equipment, each having an internal bus, during assembly and during subsequent servicing, wherein a plurality of software packages, each storing instructions and data pertinent to the testing and adjustment of a specific kind of equipment are prepared and a computer is connectable in common to the various kinds of equipment via their internal buses for testing any one of the various equipments according to the contents of the appropriate software package.
摘要:
A color information display apparatus includes a common memory of an integrated circuit configuration for storing both pattern data and color data describing an attribute of the corresponding pattern data to be displayed on a CRT, the common memory including a first address area for the pattern data and a second, different address area for the color data, a circuit for generating address signals for the common memories in response to the scanning position of the electron beam on the screen of the CRT, a parallel-serial converting circuit for converting parallel pattern data in the common memory to serial data, a first latch circuit for latching the color data in the common memory to produce an output color signal, a circuit for generating a color information signal from the serial data from the parallel-serial converting circuit and the output signal from the first latch circuit, an address selector connected between the address signal generating circuit and the common memory, the first address area and the second address area of the common memory being addressed alternatively by the address selector, and a second latch circuit connected between the common memory and the serial-parallel converting circuit for latching the pattern data supplied to the latter circuit.
摘要:
An AFT circuit for a television receiver automatically adjusts the frequency of a tuner local oscillator, not only on the basis of an error signal provided from an AFT discriminator, but also on the basis of horizontal synchronizing pulses contained in the video signal to which the receiver is tuned. A synch signal detector detects the presence or absence of the synchronizing pulses. A control circuit provides a control signal to the local oscillator in response to the AFT error signal when the latter is above or below a reference voltage such that the desired frequency is within an AFT capture range. However, when the AFT signal is at the reference voltage, the control circuit provides the control signal based on the presence or absence of the synchronizing pulses, such that when the pulses are present, the local oscillator frequency is raised, but when the pulses are absent, the local oscillator frequency is lowered. Then, when the AFT signal is present, the local oscillator is controlled thereby. This AFT circuit has an expanded effective capture range, and is prevented from locking onto the sound carrier of an adjacent channel. 00202