Selective-calling radio receiver capable of vibration warning

Details Selective-calling radio receiver capable of vibration warning Selective-calling radio receiver capable of vibration warning

1996-07-12

1999-09-21

Horabik, Michael

Communications: electrical

Continuously variable indicating

With meter reading

34082544, 455 383, G08B 522, H04B 700

Patent

active

059559640

ABSTRACT:
A radio selective calling receiver that enables to restrain the vibration strength change of a warning vibrator independent of the supply voltage change of a dc power supply. This receiver contains a warning controller for controlling a specified warning operation including a warning vibration to give a warning to a user on receipt of a calling signal, a vibrator for producing the warning vibration by an electric power supplied from a dc power supply, and a switching transistor for switching the electric power supplied to the vibrator to thereby produce the warning vibration intermittently. The transistor has a first state in which the electric power is supplied to the vibrator and a second state in which the electric power is not supplied to the vibrator. The both states are alternately effected by a control signal generated by the warning controller. The receiver further includes a power compensator for compensating change of the electric power supplied to the vibrator to thereby restrain change of a vibration strength of the warning vibration. The compensator adjusts the control signal so that a duration of the first state of the transistor is increased according to the decrease of the electric power supplied to the vibrator.

REFERENCES:
patent: 3746005 (1973-07-01), Thaler et al.

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