DDS signal generator and waveshape memory depth control method thereof

Abstract

This invention is a sort of DDS signal generator and control method of wave storage deepness, the space deepness of wave storage is set according to the wave data length, and it makes the wave data to be deposited to the wave storage space of the corresponding deepness. A wave data of this wave storage space progresses the exterior storage according to the stated order. It obtains the wave data length of the exterior storage. It accumulates the wave data length of the next wave data point according to the corresponding position of the initiative wave data point of the wave data of the exterior storage. It mappings this corresponding address to the wave data address of the exterior storage according to this wave data length. It makes the wave data of the exterior storage to be structured to the wave by the digifax transition and exports it. It is used for restructuring a sort of control mechanism of the storage deepness that it does not work the wave distortion and it makes the best of the storage deepness according to the quantity of the random wave sampling point. It not only satisfies the request of the storage of the more shortwave but also the long wave.

Description

technical field [0001] The present invention relates to signal generator technology, in particular to the control of waveform storage depth of Direct Digital Frequency Synthesis (DDS: DirectDigital Frequency Synthesis) signal generator, specifically a DDS signal generator and its waveform storage depth control method. Background technique [0002] As shown in Figure 1, the overall architecture of a DDS signal generator generally includes a man-machine interface, a waveform memory, a frequency synthesis unit, a waveform control unit and an analog unit. The waveform memory stores the sampling points within a waveform period; the frequency synthesis unit generates different waveform phase transformation points according to the frequency setting, and extracts the sampling point amplitude of the corresponding phase from the waveform memory; the waveform control unit controls the amplitude of the waveform. Offset and other related parameters; the analog unit reconstructs the sampl...

AI Technical Summary

Problems solved by technology

Moreover, for arbitrary waveforms, the internal waveform storage space provided by the DDS signal generator for users is a fixed-length waveform storage space. For arbitrary waveforms whose waveform sampling points are less than this length, a storage space has to be occupied, which is very important. wasteful

However, for arbitrary waveforms larger than this length, they cannot be stored in one storage space, which causes a huge waste of storage space due to the inability to utilize the remaining storage space, and cannot meet the storage requirements for arbitrary waveforms of different lengths.

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