AMPLITUDE DETECTING CIRCUIT

• Main Author: SAWADA HISASHI
• Format: Patent
• Language: English
• Published: 23.05.1988
• Subjects: BASIC ELECTRONIC CIRCUITRY; DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER; ELECTRICITY; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; PULSE TECHNIQUE; TESTING

PURPOSE:To obtain a circuit digitized as an envelope detecting circuit, a peak holding circuit, or a bottom holding circuit by providing an A/D converter or the like to convert an input analog signal to a first digital data. CONSTITUTION:When the circuit is used as the bottom envelope detecting circuit of an input analog signal 1, a comparator 4 outputs the high level if data of an A/D converter 2 is equal to or smaller than data of a register 7, and the comparator 4 outputs the low level if the former is larger than the latter. Consequently, data of the converter 2 is successively outputted and data DOUT is reduced as long as data of the converter 2 is smaller than output data DOUT. If the former is larger than the latter, data DOUT is increased from a digital value corresponding to the bottom value of the signal in accordance with a prescribed increase characteristic. If data of a register 8 is directly supplied to a multiplexer 6, data DOUT is not reduced or increased. That is, a complete peak holding circuit or bottom holding circuit is obtained.