Audio Filters Circuits

  

An audio filter is a frequency dependent amplifier circuit, working in the audio frequency range, 0 Hz to beyond 20 kHz. Many types of filters exist for applications including graphic equalizers,synthesizers, sound effects, CD players and virtual reality systems. Filters are defined by their slope, which determines the attenuation of signals outside the ‘pass’ band. Most audio filters on mixing desks (and DAWs) will have a slope of 12dB or 18dB per octave, and in synthesizer filters the slope may be as steep as 24dB per octave. If an 18dB/octave high-pass filter is set to 80Hz, any audio an octave below that (at 40Hz) will be attenuated by 18dB, and an octave lower still, at 20Hz, it will be attenuated by 36dB... and so on.

For example, high-pass filters are often used in studio recording and sound reinforcement to attenuate extraneous low-frequency content like mechanical rumble or vocal plosives. By choosing a filter with a cutoff frequency below the fundamental frequency range of the program, a HPF can be used to differentiate between program signal and low-frequency noise. Low-pass filters can also be used to eliminate unwanted, counter-productive bandwidth. One common example is using a LPF to establish the limited bandwidth of a low frequency transducer, like a ‘sub’ mic on a kick drum. Other examples include the entire universe of subtractive synthesis.

 

 

News

Vintage Audio Projects' quest to futureproof gear

PSNEurope Vintage Audio Projects' quest to futureproof gear PSNEurope From that decision, Vintage Audio Projects evolved. “The idea came because I wanted to add Neve 1073 ... Oostvogels teamed up with Jurgen...

Feb 16, 2017

The 9 Best Synthesizer Shops in the US

THUMP The 9 Best Synthesizer Shops in the US THUMP Demand for niche gear ranging from obscure analog synthesizers to DIY Eurorack modules has resulted in a wealth of boutique electronic -minded music shops around...

Jan 24, 2017

The Best New Eurorack Synth Modules from NAMM 2017

Reverb News The Best New Eurorack Synth Modules from NAMM 2017 Reverb News Continuing in the tradition of other Mutant modules like the BD9, Mutant Hi-hats, and Mutant Snare, the Mutant Rimshot seems pretty...

Jan 24, 2017

Vishay's OLED Display Modules Now Shipping from Mouser

Gizbot Vishay's OLED Display Modules Now Shipping from Mouser Electronics360 Vishay OLED modules . Source: Mouser Global electronics distributor Mouser Electronics , Inc., is now stocking organic light...

Jan 25, 2017

This Is How Nike's Self-Lacing Sneakers Actually Work

Gizmodo This Is How Nike's Self-Lacing Sneakers Actually Work Gizmodo All of the periphery electronics are connected to this palm-sized circuit board. That means ... Those extra pins could connect to anything:...

Feb 10, 2017

These puzzle-like synth modules sound as weird as they look

FACT These puzzle-like synth modules sound as weird as they look FACT ... have designed to let people create sound more intuitively. Polytik consists of four battery-powered modules that connect with ribbon cables,...

Feb 1, 2017

Apple patent details modular Apple Watch accessories disguised as bracelet links

AppleInsider (press release) (blog) Apple patent details modular Apple Watch accessories disguised as bracelet links AppleInsider (press release) (blog) Module control is accomplished by assigning unique identifiers...

Jan 24, 2017

Day: January 28, 2017

Hackaday Day: January 28, 2017 Hackaday Behind the LEDs is the trusty LM3915, an integrated circuit which will no doubt be familiar to any reader whose earlier life was spent among 1970s and 1980s audio gear....

Jan 28, 2017

Earnings Preview: What To Expect From Qualcomm After Wednesday's Close

Forbes Earnings Preview: What To Expect From Qualcomm After Wednesday's Close Forbes The Company also develops and commercializes a range of other technologies used in handsets and tablets that contribute to end...

Jan 25, 2017

ISE 2017: RCF releases raft of new install products

ISE 2017: RCF releases raft of new install products Audio Media International Main features include: Fast response and low distortion; Eight different operation modes, two of which are with internal crossover; Extensive...

Feb 9, 2017

Units & Modules