This paper presents an evolutionary design of digital IIR filters using the genetic algorithm (GA) with modified genetic operators and real-valued encoding. Conventional digital IIR filter design methods involve algebraic transformations of the transfer function of an analog low-pass filter (LPF) that satisfies prescribed filter specifications. Other types of frequency-selective digital filters...

Complete CODEC and FILTER system including: PCM ANALOG TO DIGITAL AND DIGITAL TO ANALOG CONVERTERS POWERFUL ANALOG FRONT END CAPABLE TO INTERFACE DIRECTLY: Microphone Dynamic, Piezo or Electrete Earpiece down to 100Ω or up to 150nF Loudspeakerdown to 50Ω or Buzzer up to 600nF. TRANSMIT BAND-PASS FILTER ACTIVE RC NOISE FILTER RECEIVE LOW-PASS FILTER WITH SIN X/X CORRECTION MU-LAW OR A-LAW SELECT...

a fundamental aspect of signal processing is filtering. Filtering involves the manipulation of the spectrum of a signal by passing or blocking certain portions of the spectrum, depending on the frequency of those portions. In this paper, Digital filters are designed using frequency specifications. Matlab provides different options for digital filter design, which includes function, calls to fil...

In this paper an Enhanced Teaching-Learning Based Optimization (ETLBO) algorithm is employed to design stable digital infinite impulse response (IIR) filter using Lp-norm error criterion. The original TLBO algorithm has been remodeled by merging the concept of opposition-based learning and migration for selection of good candidates and to maintain the diversity, respectively. The multiobjective...

We modified the Adaptive Noise Cancellation procedure of Widrow et al. (11 for use as an adaptive band-pass filter to process Steady-State Evoked Potentials (SSEPs). The adative filter yields an approsimate 10 dB improvement in Signal to Noise Ratio over the Discrete Fourier Transform. Introduction Steady-state evoked potentials (SSEPs) are comprised of narrow-band signals buried in broad-band ...

A channel vocoder derives the short time magnitude spectrum of speech by passing the speech through a set of analyzing channels, each consisting of a band pass filter followed by an envelope detector and a low pass filter. Each channel produces a slowly varying output signal which represents a short term average of the speech energy in the corresponding frequency band. The measurement of the po...

New configurations of compact dual/triple/ multiple pass-band filters, which are well suited for applications in wireless communications, are presented. Asymmetric stepimpedance resonators are the main elements for the design of these filters. In order to increase the number of attenuation poles in the vicinity of the pass-band regions, negative and positive cross coupling between source and lo...

Wireless communication is becoming more and more popular. In this paper, a maximally flat low-pass filter and a equal-ripple low-pass filter have been designed for Ultra High Frequency (UHF) band ie I.T.U. band 9 (Frequency 300Mhz – 3000Mhz; Wavelength 1m – 100mm).Application of UHF band includes television, microwave ovens, mobile phones, wireless LAN, Bluetooth, etc. The filters are designed ...

This paper presents concept of universal filter using operational transconductance amplifier (OTA).The 0.18μm CMOS process is used for design and simulation. This OTA has basing current of 50μA with supply voltage ±1.25v. The design and simulation of this OTA is done using CADENCE virtuoso environment with UMC 0.18μm technology file. This paper presents a electronically tunable voltage mode uni...