Receiving circuit of comparing and discriminating three-digit

Abstract

Abstract PURPOSE:To discriminate quickly and suitably a numeral train of 3-digit, by comparing the numeral train of 3-digit with a dial pulse transmitted from a telephone set with a preset numeral pattern. CONSTITUTION:A signal processing section 1 receives the 1st input signal being a dial pulse representing a numeral of 3-digit, the 2nd input signal being an inter-digit discriminating signal of the dial pulse and the 3rd input signal being a start signal to start and complete the monitor of the dial pulse respectively and converts them into digital signals. Further, a control section 2 controls the output of the signal processing section 1. A count section 3 receiving the output of the control section 2 counts the 1st input signal with the 2nd and the 3rd input signals and recognizes the received numeral. Further, an input numeral comparison section 4 compares the numeral outputted from the count section 3 one by one digit with the preset 3-digit numeral pattern. Thus, the numeral of 3-digit is discriminated quickly and suitably.

Inventors

• 👤 Naohito Kataoka
• 👤 片岡　尚人

Bibliographic Details