Control signal receiving system

Claim 3

The method as claimed in claim 1, wherein said at least one necessary data stream is subsequent to said synchronizing signal portion, and said one of said data streams contained in said second data stream group immediately precedes said synchronizing signal portion.

Claim 4

The method as claimed in claim 1 or 2, wherein said commencing step and said terminating step are timed by counting bits from a detection of said synchronizing signal portion.

Claim 5

An intermittent control signal receiving system for receiving necessary data contained in a control signal containing a series of signal frames each composed of a synchronizing signal portion followed by a control data portion, said control data portion being composed of at least two data stream groups each having identical content, said data streams of a first one of said data stream groups being arranged alternately with said data streams of a second data stream group, said necessary control data being contained in said data streams of said first one of said data stream groups, comprising an antenna, an antenna duplexer connected to said antenna, a receiver section having an input connected to an output of said antenna duplexer, a PLL synthesizer section operatively connected to said receiver section for converting a received signal into an intermediate frequency signal, said PLL synthesizer section including a voltage controlled oscillator, a frequency divider stage for dividing an output frequency of said voltage controlled oscillator, a phase comparator for comparing an output of said frequency divider stage and a reference frequency signal and a charge pump having an input connected to said phase comparator and an output connected to said voltage controlled oscillator for holding an output signal of said phase comparator, a control section operatively connected to said receiver section for controlling operation of said receiving system, and control timing means responsive to an output of said control section for controlling operation of said frequency divider stage such that power is supplied to said frequency divider stage when one of said data streams of said second data stream group is detected by said control section and said power supply to said frequency divider stage is stopped after said necessary data stream is detected by said control section.

Claim 6

An intermittent control signal receiving system for receiving necessary data contained in a control signal containing a series of signal frames each composed of a synchronizing signal portion followed by a control data portion, said control data portion being composed of at least two data stream groups each having identical content, said data streams of a first one of said data stream groups being arranged alternately with said data streams of a second data stream group, said necessary control data being contained in said data streams of said first one of said data stream groups, comprising an antenna, an antenna duplexer connected to said antenna, a receiver section having an input connected to an output of said antenna duplexer, a PLL synthesizer section operatively connected to said receiver section for converting a received signal into an intermediate frequency signal, said PLL synthesizer section including a voltage controlled oscillator, a frequency divider stage for dividing an output frequency of said voltage controlled oscillator, a phase comparator for comparing an output of said frequency divider stage and a reference frequency signal and a charge pump having an input connected to said phase comparator and an output connected to said voltage controlled oscillator for holding an output signal of said phase comparator, a control section operatively connected to said receiver section for controlling operation of said receiving system, and control timing means responsive to an output of said control section for controlling operation of said frequency divider stage such that power is supplied to said frequency divider stage when one of said data streams of said second data stream group is detected by said control section and said power supply to said frequency divider stage is stopped after said necessary data stream is detected by said control section.

Claim 7

The intermittent receiving system according to claim 4, wherein said frequency divider stage comprises a variable frequency divider having an output connected to said phase comparator and a prescaler having an output connected to an input of said variable frequency divider and an output connected to an input of said variable frequency divider and an input connected to said voltage controlled oscillator, said prescaler being controlled by said control timing means.

Claim 8

The intermittent receiving system according to claim 5, wherein said control timing means comprises a control timing generator and a switching means for selectively supplying said power to said prescaler, said control timing generator being responsive to an output signal of said control section indicating detection of the start of said one of said data streams of said second data stream group to generate a first timing signal for closing said switching means so as to supply said power to said prescaler and responsive to an output of said control section indicating detection of the termination of said necessary data stream for generating a second timing signal to open said switching means to thereby stop the power supply to said prescaler.