TH23661B - A surface wave filter circuit for a digital satellite tuner. - Google Patents

Abstract

Modulator of digital satellite TV tuner Containing a single signal inverting sector, which generates a sufficiently low frequency IF signal. To allow SAW filters to be used to perform symbolic operations as well as normal IF filtering, the oscillator at that position is controlled by an IC that controls the rectification of the waveform. This is usually used to control the oscillator at its position. Signal tuning Of an existing broadcasting or transmitting television receiver In a sample format for the modulation of the RF signal generated by the inverter. With a block frequency of 950 to 1450, the IF signal has a center frequency of 140 mHz. SAW filters, lithium tantalates, are used to reduce The shift of the middle IF frequency to the lowest caused by Temperature, and remember to get the desired IF signal frequency band width (that is, the IF frequency band width divided by the IF center frequency).

Claims (1)

1. Digital satellite TV receiver For receiving digital signal processing Modulated On either of the RF signals that are received from the outdoor unit, including the antenna. Satellite receiver And block converters whose modulator contains an RF input for receiving a certain amount of RF signal generated by a block converter. A position oscillator for generating a positional oscillator A mixer with one input is attached to that RF input, a second input to Oscillator