In this series, it is easy to see two rows of multiple values. Multiplicity values sampling facilitates the process of converting this frequency – resampling. However, since different coding standards Digital audio created by different organizations at different times and with different objectives, not all the frequencies adopted in the computer world, multiples of each other. According to the Nyquist-Kotelnikov theorem, the maximum frequency original audio signal that can be sent by digital coding, equal to half the sampling frequency. This means that if the adc operates with a sampling rate of, say, 24 , the maximum possible frequency in spectrum of digital audio will be equal to 12 . But in the input analog signal is likely components, whose frequency exceeds 12 . When you convert a 'forehead' of these components will not disappear from the digitized signal without a trace.

They manifest it in the form of distortions (mostly – the typical 'chatter'). To save a digital signal distortion, filtering is applied, which removes the signal components with frequencies above half sampling frequency. Go into this in detail we will not only note that, since an ideal filter does not exist in practice, the maximum frequency that can be written in digitized form, is less half the sampling frequency. Finally, the sound may be multi-channel. Modern sound cards support a different number of channels when playing audio, but if we are not talking about professional equipment, then the sound recording, we can choose between a single channel or two.

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Audit: is it possible to more efficiently? Typically, the model of it audit with the goal based on risk assessment or on the auditor's expertise in any particular area. If a customer has a question about anything, it can be represented as a risk. It should be noted that management based on risk requires a fairly advanced and specific management, such a model is not very common not only for us but also to the west. At the same time, often conduct an audit in order to reduce any One key risk. Everyone remembers the epic with the it audit "2000 problem". Similarly, with efficiency: as a rule, we are talking about one or two articles in the budget, and the audience's attention specifically to attract them. In such matters, often turn to the examination.

The main stages of the audit in fact, conducting any it audit is roughly the following steps: Clarification of goals and harmonization of it audit, Conduct a survey and Documentation of inspections Preparation of recommendations and report generation. Typically, for such works using interviews, review of available documents. At nic has its own base screening questions to determine the real situation in the selected model. What you should pay attention to? The most important thing – is to clearly define the purpose of the it audit, write them down and discuss with the auditor as a goal and strategy for the audit. Organization needs to plan in advance the possibility of conducting the audit.