摘要:
DATA TRANSMISSION SYSTEMS USING CARRIER MODULATION FOR TRANSMITTING DIGITAL DATA SIGNALS OVER CHANNELS PROVIDNG LIMITED BAND WIDTHS. CROSS-OVER NETWORK MEANS PROVIDE HIGH AND LOWER FREQUENCY COMPONENTS OF THE INPUT SIGNALS MEANS ARE THEN PROVIDED FOR UTILIZING THE HIGH AND LOW FREQUENCY COMPONENTS TO MODULATE CARRIER SIGNALS AND TRANSMIT THE HIGH FREQUENCY COMPONENT AS A SIGNAL SIDE BAND SIGNAL AND THE LOW FREQUENCY COMPONENT AS A DOUBLE SIDE BAND SIGNAL, BOTH USING THE SAME CARRIER FREQUENCY.
摘要:
A capacitive signal dependent upon a quantity being measured is produced by capacitive sensors of a radiosonde. An oscillator in the radiosonde has an output frequency, controlled by the capacitive signal, in the order of 1 to 10 MHz. The output frequency of the oscillator is divided by a factor of 2.sup.7. A high frequency transmitter in the radiosonde is frequency modulated by a frequencyf.sub.M1 =f.sub.M0 /dwherein f.sub.M1 is the output frequency of the divider and f.sub.M0 is the input frequency of the divider.
摘要:
Up to date television programming information along with a commercial is provided for a viewer of television independent of the viewer's television set. Such is accomplished by a radio either AM or FM which broadcasts first and second subcarrier signals carrying respectively a commercial and up to date television program information. The commercial and up to date television program information repeats after given set time periods, the later being updated every one-half hour. A viewer need only operate a specially designed radio receiver at a convenient location anytime he wishes to know which programs are coming up on his television set. The receiver is designed so that it will always play the broadcast commercial before the television program so that the system can be appropriately financed with no cost to the viewer.