Asynchronous Sigma-Delta Modulators

Encoding with Asynchronous Sigma-Delta Modulator (ASDM)

• ASDM Encoding (asdm_encode.m) [2]:

  Encodes a bandlimited signal using an ASDM encoder. A signal can be encoded by a single ASDM encoder (Single-Input Single-Output Encoding), as shown below, or it can be encoded by multiple of such ASDM encoders (Single-Input Multiple-Output Encoding).

  

Decoding for Signal Encoded with Single-Input Single-Output ASDM Encoder

• Decoding (asdm_decode.m) [2]:

  Reconstructs a bandlimited signal encoded by an Single-Input Single-Output ASDM encoder using sinc kernels.

  

• Decoding using Fast Approximation Method (asdm_decode_fast.m) [4]:

  Reconstructs a bandlimited signal encoded by a Single-Input Single-Output ASDM encoder using a fast approximation method.

  

• Decoding using Threshold-Insensitive Method (asdm_decode_ins.m) [2]:

  Reconstructs a bandlimited signal encoded by a Single-Input Single-Output ASDM encoder. This reconstruction method does not require the specification of an integrator threshold.

  

Decoding for Signal Encoded with Single-Input Multiple-Output ASDM Encoder

• Population Decoding (asdm_decode_pop.m) [7]:

  Reconstructs a bandlimited signal encoded by multiple ASDM encoders using sinc kernels.

  

• Population Decoding using Threshold-Insensitive Method (asdm_decode_pop_ins.m) [2] [7]:

  Reconstructs a bandlimited signal encoded by multiple Asynchronous Sigma-Delta Modulators using sinc kernels. This reconstruction method does not require the specification of an integrator thresholds.