TD_DFFTCONV Function | Teradata Vantage - TD_DFFTCONV - Teradata Vantage

Database Unbounded Array Framework Time Series Functions

Deployment
VantageCloud
VantageCore
Edition
VMware
Enterprise
IntelliFlex
Product
Teradata Vantage
Release Number
17.20
Published
June 2022
ft:locale
en-US
ft:lastEdition
2025-04-04
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TD_DFFTCONV is a Fast Fourier Transform result converter that converts an ART generated by TD_DFFT into a different result form. Instead of running TD_DFFT a second time with the original input to produce results in a different format, this function can be used with the TD_DFFT result. The benefit is the main TD_DFFT algorithm is not run as this function only does conversions and is far more efficient. Another benefit is that the original input passed to TD_DFFT is not needed.

For example, you have a TD_DFFT result that is in raw form and the payload types are COMPLEX. However, you need the result in human-readable form with payload type AMPL_PHASE_DEGREES. The TD_DFFT result can be passed to TD_DFFTCONV to convert and produce an ART with the needed form.

The function is designed to handle discrete, finite-length signals. It is used in signal processing, image processing, audio signal processing, and telecommunications.

See TD_DFFT.