The influence of quantization on level on an error of the digital voltmeter of alternating voltage

There are given the results of influence the level quantization to the accuracy of measured AC voltage by digital voltmeter. It is shown the influence of sampling frequency and the type of digital filter to effective digit capacity of conversion in case of synchronous and asynchronous sampling. There is obtained an estimate of error by representing the quantization error by centered noise with a uniform distribution. There are presented the results of modeling a digital voltmeter.

TECHNIQUE OF REDUCTION TRANSFORMATIONS FOR MINIMIZATION OF ANALYZED NUMBER OF PARALLEL PROGRAM VARIANTS

Formulated several important conclusions of the basic theorems and the main principles of the reduction transformations’ technique. In comparison with automatic parallelizing, the proposed principles provide a considerable decrease in the number of steps required for the applications’ adaptation to architectures of reconfigurable computer systems. At the first stage, the reduction coefficient is factorized, and the rational values of different types of reduction coefficients (by the number of basic subgraphs, by the number of computational operations and by the digit capacity of data) are chosen from the multipliers. At the second stage, the reduction of basic subgraphs’ number is performed according to the coefficient chosen at the previous stage. At the third stage, the number of computational operations and the digit capacity of processed data are reduced to the limit values. The application of the reduction transformations’ technique allows for the integration of multiple variants of parallel program in one group and for the shortening of time needed for its adaptation to the architecture and configuration of a computer system. According to the estimations, the number of reduction transformation steps needed for the calculations’ scaling in reconfigurable computer systems is 26 steps and considerably less than the one for automatic parallelizing compilers.

TONE DEVICE SYNTHESIS FOR MODULE MULTIPLICATION

The application of the systems of residual classes (SRC) allows carrying out arithmetic operations of addition and multiplication more efficiently which are basic in DSP at the expense of small digit capacity of deductions. An additional growth of an operating speed gives a transition from a digital processing to a tone one, that is, to number encoding in the SRC by discrete phases of tone signals of one frequency. The application of an instrumentation framework on the superconductor basis shows an outlook of the special processor formation on the basis of principles marked earlier with the productivity of a subtherahertz order. If a mathematical expression for a signal processing is rigidly specified and contains a constant k which does not need to vary, then in the special processor structure a tone multiplication of a number by a constant through a module may be carried out as a serial addition of an operand with itself. If a special processor work needs sometimes a program reconstruction of system constant parameters, then it is possible to carry out on the basis of other multiplication device by a constant. A tone multiplication of two numbers by a module is formed through a simplest algorithm consisting in a serial addi-tion through a module of the first operand with itself and a choice of the result required through the second operand. The multiplication fulfillment through a mod-ule in a tone form in different versions is possible that enables unique possibilities of signal processing on the basis of the wellknown DSP methods with an operation speed which is a record for these algorithms.