modulation

android PPM decoder audio library

由 旧城冷巷雨未停 提交于 2019-12-24 15:52:32
问题 I need to implement audio PPM (Pulse Position Modulation) on android Reference: http://en.wikipedia.org/wiki/Pulse-position_modulation I want to receive PPM using the audio microphone input of the smartphone. The radios for radiocontrols, drones, etc, commonly have a PPM output. Transmitters (and pc flight simulators) commonly have PPM input. I wish to know if you can help me in this task. As you can read here i still wrote the ppm encoder class: android PPM encoder audio library These are

How to create diagonal stripe patterns and checkerboard patterns?

由 随声附和 提交于 2019-12-12 05:29:37
问题 Based on this question, I can confirm that horizontal patterns can be imposed onto a matrix (which in this case is an image), by multiplying it with a modulation signal created with this: vModulationSignal = 1 + (0.5 * cos(2 * pi * (signalFreq / numRows) * [0:(numRows - 1)].')); It would also be great if someone could explain to why the above modulation signal works. Now I want to create diagonal patterns such as : And criss-cross (checkered) patterns such as this: using a similar

android PPM encoder audio library

由 佐手、 提交于 2019-12-01 12:23:52
I need to implement audio PPM (Pulse Position Modulation) on android Reference: http://en.wikipedia.org/wiki/Pulse-position_modulation I want to output PPM from the audio output of the smartphone. The final scope is to create a joystick for radiocontrol. but this library may have many future purposes (follow me, lightbridge, etc.etc.). The radios commonly have a PPM output. Transmitters (and pc flight simulators) commonly have PPM input. My scope is to replace the radio with an android device. I wish to know if there is some piece of code ready to use or should i start from scratch? EDIT: I

android PPM encoder audio library

由 ぃ、小莉子 提交于 2019-12-01 11:37:29
问题 I need to implement audio PPM (Pulse Position Modulation) on android Reference: http://en.wikipedia.org/wiki/Pulse-position_modulation I want to output PPM from the audio output of the smartphone. The final scope is to create a joystick for radiocontrol. but this library may have many future purposes (follow me, lightbridge, etc.etc.). The radios commonly have a PPM output. Transmitters (and pc flight simulators) commonly have PPM input. My scope is to replace the radio with an android device
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