Battery operated radio receivers having power save by reducing active reception time

A portable radio receiver comprising:

• data-detection circuitry in a receive path adapted to detect data destined for a selected receiver;
• pre-conditioning circuitry in said receive path adapted to pre-condition said radio receiver using pre-conditioning functions during a pre-conditioning period;
• and
• control circuitry coupled to said data-detection circuitry and said pre-conditioning circuitry, said control circuitry adapted to activate said receive path for said pre-conditioning period, to deactivate at least a part of said receive path during a time interval in a frame that precedes a data-detection time interval of said frame thus terminating said pre-conditioning period prior to said data-detection time interval when predetermined characteristics of a signal received during said frame are within corresponding thresholds and to reactivate said receive path for said data-detection time interval, each of said predetermined characteristics affected by one or more of said preconditioning functions.

A portable radio receiver comprising:

• data-detection circuitry in a receive path adapted to detect data destined for a selected receiver;
• pre-conditioning circuitry in said receive path adapted to pre-condition said radio receiver using pre-conditioning functions during a pre-conditioning period;
• and
• control circuitry coupled to said data-detection circuitry and said pre-conditioning circuitry, said control circuitry able to activate said receive path for said pre-conditioning period and to deactivate at least part of said receive path until the start of a data-detection time interval of a frame thus terminating said pre-conditioning period prior to said data-detection time interval when predetermined characteristics of a signal received by said receive path during said frame are within corresponding thresholds, each of said predetermined characteristics affected by one or more of said preconditioning functions.