All Pass Filter Design : Approximation Methods For Electronic Filter Design.
All Pass Filter Design
- Filter design is the process of designing a filter (in the sense in which the term is used in signal processing, statistics, and applied mathematics), often a linear shift-invariant filter, which satisfies a set of requirements, some of which are contradictory.
- go across or through; "We passed the point where the police car had parked"; "A terrible thought went through his mind"
- A route over or through mountains
- A passage for fish over or past a weir or dam
- A navigable channel, esp. at the mouth of a river
- base on balls: (baseball) an advance to first base by a batter who receives four balls; "he worked the pitcher for a base on balls"
- passing(a): of advancing the ball by throwing it; "a team with a good passing attack"; "a pass play"
Audio Technica BP4073 Line Plus Gradient Condenser Microphone
Through the use of an innovative Audio-Technica design, the interference tube of the BP4073 provides a narrow acceptance angle, effective for long-distance pickup. The highly directional mics offer low self-noise and with an overall length of just 9.17 inches and weight of just 3.5 oz, this microphone adds virtually no heft to the end of a fish pole or the top of a mini-cam. Audio Technica BP4073 Features Designed for use in broadcasting, film/TV production and theater Productions Direct-coupled, balanced output for a clean signal even in high-output conditions Innovative acoustic design provides same directivity as mics up to 50% longer Switchable 80 Hz hi-pass filter & 10 dB pad Red housing made of lightweight structural-grade aluminum alloy RoHS-compliant - free from all substances specified in the EU directive on the reduction of hazardous substances (RoHS)
Design Challange Close-Up
Our Water Filtration System
The challange was to design an inexpensive water filtration system for people that can't afford proper water filtration. I came up with the concept of using, what ended up being cups, containers that could fit together like so to house the necessary filters and steps of the process.
What happens is, you pour the filthy liquid into the "Opening" .
It then, runs through the first step, the "Coarse Strainer", which filters out large items like rocks.
Next, it goes through the "Micro Strainer", which takes out smaller things like sand, and dirt.
If anything passes through the first two phases, most of the excess "grossness" will be caught in the "Excess Filter" .
The final step to the process, is the "Final Filter" which was the most effective step in the system. It, being the only item that actually only allows pure liquid to go through, got the finest particles of dirtiness in the water, and ended up coming out very clean.
Once the steps listed above are completed, the water runs into the container at the bottom, with clear, clean water.
Spirit Ball disassembly 8
The master control card. As far as I can tell, this is an entirely analog design. The riser card at the bottom is an epoxied audio chip. The rest of the card is all about low-pass filtering the audio signal and using it to drive the servos directly. I haven't spent enough time examining this yet.
all pass filter design
The Sterling Audio ST55 is an FET condenser microphone that employs a large capsule with an ultra-thin 3-micron evaporated gold Mylar diaphragm. The ST55 mic is built with an exclusive process that extends high frequencies and improves details and depth on both vocal and instrument recordings. The FET Class-A electronics provide smooth, warm sound.Sterling Audio microphones employ several advanced technologies that separate their large-diaphragm condenser mics from the rest of the pack. One of the more important advancements is their Disk Resonator system. With it, Sterling Audio is uniquely able to compensate for the 14kHz frequency roll-off that is inherent in large diaphragm mics. As any good audio engineer knows, this deficiency translates to a lack of sparkle from high-frequency sound sources. Other manufacturers have typically solved this problem by cutting other frequencies and then increasing the entire signal to help even out the frequency range. Unfortunately, this results in increased noise. Disk Resonator Technology incorporates a brass umbrella that protrudes from the center of the diaphragm in Sterling Audios ST55 microphone. It gently boosts the diaphragm sensitivity to shorter sound waves, allowing it to respond more accurately to those all-important higher frequencies. The result is optimal sensitivity, full frequency response, and a low signal-to-noise ratio. Another piece of audio wizardry comes in the form of the ultra-thin diaphragm membrane made of Mylar. While most modern condenser diaphragms are 6 to 12 microns in thickness, Sterling Audio, in association with 3M, has produced a highly resilient Mylar that measures a mere 3 microns. This allows the ST55 to deliver an extraordinary degree of sensitivity.Requires phantom power.
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