A 4th-order active-Gm-RC low-pass filter with RC time constant auto-tuning for reconfigurable wireless receivers

Junbo, Liu; Fan, X.; Bao, Kuan

doi:10.1109/icsict.2012.6467693

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…The result is presented as a spectrogram, with the amplitude or phase as the vertical axis and the frequency as the horizontal axis (Figure 9). Figure 10 shows the design of a Butterworth filter [18][19][20][21][22] with a cutoff frequency of 1000 Hz. The plot depicts the magnitude frequency response of the filter.…”

Section: Feature Extractionmentioning

confidence: 99%

An Electromagnetic Lock Actuated by a Mobile Phone Equipped with a Self-Made Laser Pointer

Perng

Hsieh

2019

Electronics

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The main purpose of this study was to create an acousto-optic control lock device to convert electrical signals with a specific sound command using an acousto-optic conversion module, thereby improving the reliability and safety of opening or closing remote controlled door locks, such as car central locks or rolling doors. We used music playing through a smart phone speaker to create a special laser pointer to connect with the smart phone‘s auxiliary input. The laser pointer (wavelength of 630–650 nm and maximum output of 5 mw) lights up when the smart phone’s music starts playing at a music frequency matching the light frequency. When the solar panel receives light, it converts the frequency of the light signal into an electrical frequency signal. The current is amplified using the power amplifier and then the amplified current flows to the sound recognition module. The sound recognition module performs audio comparison on the set sound signal, and once the comparison is correct, the output voltage activates the electromagnetic switch on the door to open or close it.

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