Receiver having a signal detector and bit synchronizer

In a receiver, a method of detecting the presence of a first signal having transitions between symbols occurring at a predetermined baud rate, the method comprising the steps of:

• establishing an integer number of sample windows per symbol, each sample window having a corresponding unique combination of a plurality of counting registers within a multiplicity of counting registers;
• receiving the first signal and producing a received signal having transitions;
• sensing the transitions of the received signal occurring within each established sample window;
• counting in the counting registers corresponding to each sample window in which a transition is sensed;
• generating a presence signal in response to a counting register having a predetermined number of counts;
• and
• determining the absence of the presence signal;
• conserving power to the receiver in response to the absence of the presence signal.

In a receiver, a means for detecting the absence of a signal having transitions between symbols occurring at a predetermined baud rate, the means comprising:

• a multiplicity of counting registers;
• means for establishing an integer number of sample windows per symbol, each sample window having a corresponding unique combination of a plurality of counting registers within said multiplicity of counting registers;
• means for receiving a received signal having transitions;
• means for sensing the transitions of the received signal occurring within each established sample window;
• means for counting in the counting registers corresponding to each sample window in which a transition is sensed;
• means for generating an absence signal in response to all of the counting registers exceeding a predetermined number of counts;
• and
• conserving power to the receiver in response to the absence signal.

In a receiver, a method of detecting the absence of a signal having transitions between symbols occurring at a predetermined baud rate, the method comprising the steps of:

• establishing an integer number of sample windows per symbol, each sample window having a corresponding unique combination of a plurality of counting registers within a multiplicity of counting registers;
• receiving a transmitted signal and producing a received signal having transitions;
• sensing the transitions of the received signal occurring within each established sample window;
• counting in the counting registers corresponding to each sample window in which a transition is sensed;
• generating an absence signal in response to all of the counting registers exceeding a predetermined number of counts;
• and
• conserving power to the receiver in response to the absence of the presence signal.

A receiver for receiving a signal having transitions between symbols occurring at a predetermined baud rate and having information within the symbols, comprising:

• demodulator means for demodulating the signal;
• means for selectively detecting the presence or absence of the signal, the means comprising:
• a multiplicity of counting registers;
• means for establishing an integer number of sample windows per symbol, each sample window having a corresponding unique combination of a plurality of counting registers within said multiplicity of counting registers;
• means for selecting either presence detection or absence detection;
• means for receiving a transmitted signal and producing a received signal having transitions;
• means for sensing the transitions of the received signal occurring within each established sample window;
• means for counting in the counting registers corresponding to each sample window in which a transition is sensed;
• and
• means generating a presence signal in response to the selection of presence detection and a counting register having a first predetermined number of counts;
• and
• means for generating an absence signal in response to the selection of absence detection and all of the counting registers exceeding a second predetermined number of counts;
• means for conserving power to the demodulator means in response to the absence signal;
• and
• means for processing the information in response to the presence signal.

In a receiver, a method of selectively detecting the presence or absence of a signal having transitions between symbols occurring at a predetermined baud rate, the method comprising the steps of:

• establishing an integer number of sample windows per symbol, each sample window having a corresponding unique combination of a plurality of counting registers within a multiplicity of counting registers;
• selecting either presence detection or absence detection;
• receiving a transmitted signal and producing a received signal having transitions;
• sensing the transitions of the received signal occurring within each established sample window;
• counting in the counting registers corresponding to each sample window in which a transition is sensed;
• and
• generating a presence signal in response to the selection of presence detection and a counting register having a first predetermined number of counts;
• and
• generating an absence signal in response to the selection of absence detection and all of the counting registers exceeding a second predetermined number of counts;
• conserving power to the receiver in response to the absence signal.