Trick

DSP Trick: Dealing With Propagating Truncation Errors

Trick

Subject: Dealing with propagating truncation errors
From: Ole Wolf
Date: 1999/05/26
Newsgroups: comp.dsp
THIS WORK IS PLACED IN THE PUBLIC DOMAIN

Name: Dealing with propagating truncation errors.

Category: Algorithmic tricks.

Application: When values are truncated, and the truncated values are used later in the algorithm, ultimately corrupting the output.

DSP Trick: Using Parks-McClellan to Design a Non-Linear Phase FIR Filter

Trick

From: ericj@primenet.com.nospam (Eric Jacobsen)
Subject: DSP Trick - Using P-M to design a non-linear phase FIR filter.
Date: 23 Oct 1999 00:00:00 GMT
Newsgroups: comp.dsp
THIS WORK IS PLACED IN THE PUBLIC DOMAIN

It is possible to use the Parks-McClellan algorithm to design FIR filters with non-linear phase response. For example, a FIR filter with the equivalent response of a Butterworth filter can be designed using the P-M routine.

DSP Trick: Fast Floating Point to Mu-Law Conversion

Trick

DSP Trick: Fast Floating-Point to mu-Law Conversion

From: Jim Thomas
Subject: Fast floting point to mu-law conversion
Date: 6 May 1999
THIS WORK IS PLACED IN THE PUBLIC DOMAIN

Name: Fast floating point to mu-law conversion

Category: Algorithmic

Application: When you need to convert audio data to mu-law and don't have a lot of time to mess around.

Advantages: Very Fast (I implemented this in a seven cycle loop on a Sharc processor).

DSP Trick: Fixed-Point DC Blocking Filter with Noise-Shaping

Trick

From: robert bristow-johnson <rbj@gisco.net>
Subject: Fixed-Point DC Blocking Filter with Noise-Shaping
Date: 22 Jun 2000 00:00:00 GMT, Updated: 17 Apr 2001
Newsgroups: comp.dsp
THIS WORK IS PLACED IN THE PUBIC DOMINION

Name: Fixed-Point DC Blocking Filter With Noise-Shaping

Category: Algorithmic

Application: Used anytime DC offsets need to be removed (audio level metering or nearly any audio signal processing to avoid clicks).

Miscellaneous Tricks

Trick

Data Conversion Tricks

DSP Trick: Simultaneous Parabolic Approximation of Sin and Cos

From: Olli Niemitalo (oniemita@mail.student.oulu.fi)
Subject: Trick: Simultaneous parabolic approximation of sin and cos
Newsgroups: comp.dsp
Date: 2001-06-30 05:15:09 PST

Name: Simultaneous parabolic approximation of sin and cos

DSP Trick: Filtering in QAM transmitters and receivers

Subject: Re: DSP Tricks
From: Allan Herriman
Date: 1999/04/22
Newsgroups: comp.dsp
THIS WORK IS PLACED IN THE PUBLIC DOMAIN

Name: Filtering in QAM transmitters and receivers. When *NOT* to do what the textbooks tell you to do.

Category: Hardware architecture, or implementation

Application: QAM receivers (with hardware emphasis)

Advantages: The textbook descriptions of QAM receivers sometimes miss practical details. "Optimal" solutions may not be the best ones...

DSP Trick: FIR Filtering in C

Subject: DSP Trick: Filtering
From: rainer.storn@infineon.com
Date: 1999/04/21
Newsgroups: comp.dsp
THIS WORK IS PLACED IN THE PUBLIC DOMAIN

Name: Filtering in C

Category: Programming Trick

Application: FIR-Filtering

Advantages: Simple and fast

Introduction:

This is more like a trick in C but might also be applicable in DSP environments. It allows to compute FIR-filtering in a fast manner when the filter length contains a factor of, let's say 4 (other factors are also possible).

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