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Audio-frequency current comparator power bridge ...
https://ieeexplore.ieee.org/document/192313/
Audio-frequency current comparator power bridge: development and design considerations Abstract: The development, design, construction, and partial evaluation of a system for performing active and reactive power measurement from 50 to 20 kHz is described. The technique is an extension of a power bridge based on a current comparator capacitance ...
Compare two audio files online by measuring the similarity ...
https://blue2digital.com/apps/compare-audios.html
Identifying the frequency components of each audio signal is crucial for audio comparison. The time-domain signal is difficult to inspect and must be converted to its frequency-domain equivalent before analysis can be performed. Our software utilizes an algorithm that produces an estimate of the audio signal's frequency content to compose the ...
Comparators - sound-au.com
https://sound-au.com/articles/comparators.htm
Comparators are used in many common applications, and Class-D amplifiers were mentioned above. A comparator has the incoming audio applied to one input, and a triangle wave on the other. The output is a rectangular waveform, with the mark-space (on-off) ratio varying depending on the audio input signal.
Audio Spectrum Analyzer | Op-Amp as a Comparator - …
https://www.hackster.io/indoorgeek/audio-spectrum-analyzer-op-amp-as-a-comparator-023157
From a technical point of view, music is basically a signal with varying voltage and frequency. Audio Spectrum Analyzer is a device that shows the voltage level of a particular frequency. It is an instrument mainly used in places like recording studios to analyze the sound. ... Step 1: Op-Amp As a Comparator. 1 / 11.
Sound Card Precision Frequency Comparator
http://lea.hamradio.si/~s57uuu/scdsp/frcomp/
This program uses the sound card, "phase comparator" style, to measure very small frequency differences (mHz and uHz) in real time, using time derivation of mutual phase. Normally, it can measure audio frequencies, but with a simple additional circuit, it can also compare arbitrary RF frequencies, similar to the DMTD (Dual Mixer Time Differece ...
Audio to Low-Pass Filter to Comparator to LED = Fading LED ...
https://electronics.stackexchange.com/questions/48963/audio-to-low-pass-filter-to-comparator-to-led-fading-led-based-on-the-frequenc
If I were to pass an audio signal through a Low-Pass filter with a cutoff frequency of 200 Hz (bass), and then send that signal to a comparator, then use this signal to drive an LED, would the LED be able to change its brightness based on the frequency? For example, a high frequency would drive the LED brighter than a lower frequency.
Digital Frequency Comparator | Detailed Circuit Diagram ...
https://www.electronicsforu.com/electronics-projects/digital-frequency-comparator
Digital Frequency Comparator Circuit. The other oscillator (IC5) works similarly. The oscillator frequency can be varied by the potentiometer (VR1 or VR2). Output pins (pin 3) of the oscillators (IC1 and IC5) are connected to the respective decade counters (IC2 and IC6) through the DPDT switch. IC2 and IC6 count the initial eight cycles.
Frequency comparator - 74HCT74
https://www.pe2bz.philpem.me.uk/Power/-%20Pulse/P-106-FreqCompare/cir10.htm
Frequency comparator - 74HCT74. This circuit uses a 74HCT74, 74HCT00, and a LM311 to form a frequency comparator. The two pulse trains are fed to two D-type flip-flops (triggered by the leading edges). The flip-flops' outputs are compared in a NAND gate. If the output of the NAND gate becomes "0", the flip-flops are reset.
How to design a frequency comparator? | Forum for Electronics
https://www.edaboard.com/threads/how-to-design-a-frequency-comparator.98058/
frequency comparator flip flop PLL usually uses PFD (Phase Frequency Detector) to compare frequency and phase differences between 2 clocks .This is simply performed by using 2 D-flip flops each triggered by one of the clocks and D connected to '1' and the outputs of the 2 flip-flops are anded and connected to the asynchronous reset of the 2 flip flops .This circuit …
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