FIELD: computer engineering. SUBSTANCE: devices can be used for spectrum analyses of arbitrary-shape signals. Each device has adder unit, counter, and square-pulse generator. First design alternative of device has also decoder, switches, and matrix of arithmetic units which are represented by two-input adding and subtracting units. Second design alternative of device has digital memory unit, input terminals, and channels incorporating inverters, NOT gates, and switches. EFFECT: enlarged functional capabilities. 9 cl, 12 dwg, 2 tbl
