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Related Concept Videos

Active Filters01:25

Active Filters

799
Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
799
Design Example: Capacitance Multiplier Circuit01:20

Design Example: Capacitance Multiplier Circuit

744
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
744
Cascaded Op Amps01:16

Cascaded Op Amps

609
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
609
Design Example01:23

Design Example

321
The innovation of touch-tone telephony revolutionized the telecommunications industry by replacing the traditional rotary dial with a dual-tone multi-frequency (DTMF) signaling system. This system uses a matrix-style keypad with buttons arranged in four rows and three columns, creating 12 distinct signals each assigned to a pair of frequencies. Each button press results in a simultaneous generation of two sinusoidal tones – one from a low-frequency group (697 to 941 Hz) and one from a...
321
Second-order Op Amp Circuits01:19

Second-order Op Amp Circuits

333
Implementing second-order low-pass filters in audio systems is crucial in refining audio signals by eliminating undesirable high-frequency noise. These filters typically involve second-order op-amp circuits configured as voltage followers, encompassing two nodes with distinct storage elements.
The analysis of such circuits follows a systematic approach, similar to the second-order RLC circuits. In practical scenarios, bulky inductors are rarely employed due to their size and weight. This means...
333
Passive Filters01:27

Passive Filters

526
Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff...
526

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Related Experiment Video

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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
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Tunable active noise control circuit topology for multiple-feature applications.

Tak Chun Kwong1, Yat Sze Choy1, Chetwyn Che Hin Chan2

  • 1Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China.

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This study introduces a new tunable active noise cancellation (ANC) circuit for headsets. It allows flexible noise cancellation and pass-through amplification for diverse user needs and environments.

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Area of Science:

  • Electrical Engineering
  • Acoustics
  • Consumer Electronics

Background:

  • Active noise cancellation (ANC) is a mature technology in consumer headsets, primarily for wireless devices.
  • Current ANC circuits have limitations, being designed for specific markets and preventing simultaneous ANC and pass-through functions.
  • Digital circuit implementation offers ultra-low latency processing advantages over digital signal processors (DSPs).

Purpose of the Study:

  • To present a tunable active noise cancellation (ANC) circuit topology for headsets.
  • To overcome limitations of existing ANC filters, enabling user-selectable ANC for various applications.
  • To allow simultaneous operation of ANC and pass-through amplification.

Main Methods:

  • A novel ANC circuit topology using a commercial ANC chipset and an external audio codec.
  • Integration of an audio mixer to combine ANC signals with pass-through audio.
  • Modification of the fixed maximum noise cancellation of the ANC chipset.

Main Results:

  • The proposed circuit enables tunable ANC response without restrictions from built-in filters.
  • Acoustic performance was validated for several headset applications.
  • The system allows for consumer-selective ANC in different environments.

Conclusions:

  • The presented ANC circuit topology offers a simple and adaptable solution for the consumer headset market.
  • It enables flexible and simultaneous control of noise cancellation and pass-through audio.
  • This innovation allows for customized audio experiences in diverse acoustic environments.