SLAAEH2 December   2023 TAA5212 , TAC5111 , TAC5112 , TAC5211 , TAC5212 , TAD5112 , TAD5212

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2TAx5x1x Audio Serial Interface
  6. 3TAx5x1x Synchronous Sampling Rate Converter
    1. 3.1 ADC Sampling Rate Conversion
    2. 3.2 DAC Sampling Rate Conversion
    3. 3.3 SRC Use Case Examples
      1. 3.3.1 Default Mode (Main Fs - Higher rate)
      2. 3.3.2 Default Mode (Main Fs - Higher rate) with Recording
      3. 3.3.3 Custom Mode (Main Fs - Lower rate)
      4. 3.3.4 Custom Mode (Main Fs - Lower rate) with Recording
  7. 4Summary
  8. 5References

1 Introduction

In a system where different sample rates are running, there are times a Sampling Rate Converter is needed to convert one sampling rate to another. The idea of SRC is using the sequence of discrete time sampled at a certain input sampling frequency, and with some conversion technique, create a new sequence of discrete sampled at a different rate from the input. There are Synchronous and Asynchronous converters. Synchronous converters are those with a known input sampling frequency and conversion factor, where as Asynchronous converters are systems where the exact sampling frequencies are not known. The conversion process interpolates or decimates the input signal sampled at the input signal sampling rate to the desired signal at output sample rate. Figure 1-1 shows a Sampling Rate Converter model.

GUID-20231023-SS0I-KF0K-SSKS-JLHNWVTWHKTB-low.pngFigure 1-1 Sampling Rate Converter Model