SLAAEH6 September   2024 TAA5212 , TAA5412-Q1 , TAC5111 , TAC5111-Q1 , TAC5112 , TAC5211 , TAC5212 , TAC5212-Q1 , TAC5311-Q1 , TAC5312-Q1 , TAC5411-Q1 , TAC5412-Q1 , TAD5112 , TAD5112-Q1 , TAD5212 , TAD5212-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Infinite Impulse Response Filters
    1. 2.1 Digital Biquad Filter
  6. 3TAC5x1x and TAC5x1x-Q1 Digital Biquad Filters
    1. 3.1 Filter Design using PurePath™ Console
      1. 3.1.1 Example of Programming Biquad Filters Using PurePath™ Console
    2. 3.2 Generating Coefficients N0, N1, N2, D1, D2 using a Digital Filter Design Package
    3. 3.3 Avoiding Overflow Conditions
    4. 3.4 Biquad Filter Allocation on Recording Channel
    5. 3.5 Biquad Filter Allocation on Playback Channel
    6. 3.6 Biquad Filter Programming Example on the TAC5x1x
  7. 4Typical Audio Applications of Biquad Filters
    1. 4.1 Parametric Equalizers
    2. 4.2 Crossover Networks
    3. 4.3 Voice Boost
    4. 4.4 Bass Boost
    5. 4.5 Removing 50Hz–60Hz Hum With Notch Filters
  8. 5Summary
  9. 6References

Abstract

Audio systems make use of many signal processing function like Equalizers, Voice or Bass Boost, Mixers, and so on. The TAC5x1x and TAC5x1x-Q1 family of stereo audio codecs include different signal processing blocks based on the end application. This application note describes the operation of one of these signal processing blocks, the programmable per-channel infinite-impulse response (IIR) biquad filters. The application note also shows how these filters can be configured using the PurePath™ Console based on the desired frequency response.

The programmable biquad filters described in this application note are available in the following ADC, DAC, and Codec families:

  • TAC5212, TAC5112, TAC5211, TAC5111
  • TAC5212-Q1, TAC5112-Q1, TAC5111-Q1
  • TAA5212
  • TAD5212, TAD5112
  • TAD5212-Q1, TAD5112-Q1
  • TAC5412-Q1, TAC5312-Q1, TAC5411-Q1, TAC5311-Q1
  • TAA5412-Q1

The TAC devices have the biquad filters on both recording and playback paths, whereas the TAA devices have the biquad filters only on the recording path, and TAD devices have the biquad filter only on the playback path.