Radio selective call receiver

Abstract

Abstract PURPOSE:To prevent missing or theft of a radio equipment and also to attain the request of paying of unpaid charge by stopping a reception function when a prescribed signal is received after a selective call signal is received and allowing the equipment to recognize it as sound or visual information. CONSTITUTION:A reception signal from an antenna 1 is demodulated after being amplified at a radio section 2, and converted into a waveform possible for being read by a decoder 4 by means of a waveform shaping circuit 3. The decoder 4 controlled by a clock signal from a crystal oscillator 10 compares the own call number written in advance in a P-ROM5 with a signal from the waveform shaping circuit 3 and applies a ring signal to an amplifier in order to inform the calling when the both are coincident, a speaker 7 is driven to generate the ring tone and to drive a liquid crystal display 8 thereby giving visual information to a possessor of the receiver. Further, a reset switch 9 is connected to the decoder 4 to conduct the stop of the ring tone and display stop or start or the like of the display device 8.

Inventors

• 👤 Yoshiaki Ichikawa
• 👤 市川　善朗
• 👤 Masaaki Akahori
• 👤 赤堀　政明
• 👤 Daisuke Ishii
• 👤 大助 石井
• 👤 Kazuyuki Tsunoda
• 👤 和之 角田

Bibliographic Details