公开(公告)号：US3769593A

公开(公告)日：1973-10-30

申请号：US3769593D

申请日：1972-03-08

Applicant: STEWART WARNER CORP

Inventor： WILLIAMS R

IPC: G08B3/10 ,  H04W52/02 ,  H04W88/02 ,  H04B1/06

CPC classification number: H04W52/0229 ,  G08B3/1066 ,  H04W88/028 ,  Y02D70/00

Abstract: A battery conservation circuit for a selective paging receiver adapted to receive subscriber address-bearing code signals of a specific format comprises a timing circuit which periodically energizes the receiver for short periods of time to determine if valid address-bearing signals having the specific format are present. If such signals are present, the timer is latched in the on state and the receiver is continuously energized to permit decoding received addresses. When valid signals are no longer present, or when the amplitude of the reserved signal is too low for reliable operation, the timer circuit is unlatched after a predetermined time delay to resume the battery-saving cycle.

公开(公告)号：US3768090A

公开(公告)日：1973-10-23

申请号：US3768090D

申请日：1972-03-08

Applicant: STEWART WARNER CORP

Inventor： WILLIAMS R

IPC: H04W88/02 ,  G08B3/10

CPC classification number: H04W88/027

Abstract: A signal regenerator circuit for a selective paging receiver utilizes a differential amplifier to derive from a received subscriber address-bearing code signal a level-equalized code signal suitable for application to the receiver decoding circuitry. To make the width of the individual bits of the derived code signal independent of the received signal amplitude, an amplitude-dependent control voltage is applied to the differential amplifier to vary the slicing level of the amplifier with variations in signal amplitude. A clamping circuit is provided to stablize the slicing level, and a capacitor discharge circuit is provided to prevent low-frequency DC skewing by the large interstage coupling capacitance employed in the regenerator circuit.

Abstract translation: 用于选择性寻呼接收机的信号再生器电路利用差分放大器从接收到的用户地址承载代码信号导出适合于应用于接收机解码电路的电平均衡码信号。 为了使导出代码信号的各个位的宽度与接收信号幅度无关，幅度相关的控制电压被施加到差分放大器以改变具有信号幅度变化的放大器的限幅电平。 提供钳位电路以稳定限幅电平，并且提供电容器放电电路以防止由再生器电路中使用的大的级间耦合电容引起的低频DC偏移。