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20 Threads found on edaboard.com: Cancelling Noise
This is an echo cancelling system used in modems and other communication devices. Some have single echo cancel, better ones have two like this problem. This was the main reason for old phone modem connection speed limits due to noise caused by echoes, not hiss or hum. Now the same is true with WiFi, similar in forward direction, we call it Ri
I am currently building an active noise cancelling headphone. However, there are some circuit design problems that I am not sure on my design. Basically, in my design, there is a mic capsule connecting a low pass filter pre-amp.Then the pre-amp is connecting to inverter, which can generate the inverted frequency. However, I don't know which circui
I am trying to develop a noise cancelling circuit for personal use with existing headphones. I have obtained as3430 IC for this purpose, but i have not been able to find some of the key values to completely develop the circuit. Please, refer to the attached image. Data sheet for the IC is available here
Another low cost and very simple trick you can try is to cut polarized filters and align them at each end to reduce off-plane pick up. It might work with the noise cancelling circuit to further improve the SNR. Cheap source of polarized filters: 1. 'Polaroid' sunglasses, cut the lens to size. 2. salavage from small LCD displays such as broken wri
You have too many threads about your noisy printer room. In your first thread you were told that using sound absorbent material for walls, ceiling and floor will reduce the average sound level. Of course earplugs should be used by workers but I recommended noise cancelling headphones.
Hello, Folks, I am looking for a pair of Active noise Cancellation (ANC) headphones that could cancel human speaking. But almost all headphones in the market are just cancelling the low-frequency noises such as engine or fan. I do not understand why the higher-frequency parts of human voices could not be cancelled since ear hearing (...)
Hi there i am a final year student in electronics and i need help for my final year project which is implementation of an "active noise cancelling headphone" using FPGA. please contact me on if you can help me i need to submit the project in November 2012. help is needed urgently
Electret mic has a FET inside, so the gain is proportional to the load resistance, which also affects DC offset from V+ {but out want mic out =V+/2} Modern sound chips often have 0~30dB of gain and so dc offset in the amp, pop filtering, noise cancelling properties and low frequency rejection are all important. Single transistor
You need a noise cancelling mic on phone, -external hands-free mic/earbuds with noise cancelling mic (double sided) is best bet. Test for quality. cheapest one I found just now..
In noise cancelling mode, CPU is in sleep state for A/D conversion time - no HF noise generated. Interrupt wakes CPU from sleep state just after A/D conversion is finished. Variable "adc_data" is global and is probably declared elsewhere.
Hi, I am designing wide band lna and freq range is 0.7~2.7GHz am using noise cancelling technique, but gain is not flat. and linearity is poor in 0.7GHz than 2.7GHz. Is there possible to use shunt peaking inductor to get flat gain and how to improve linearity (I'm using CADENC for simulation)
I am going to design a project which will cancel the ambient noise. the device will capture the speaker's voice but eliminate all other noises from ambient such as high way, construction field, in airplane, etc.. I did some researches, the two microphones seems right direction. the first mic picks up speaker's voice, and second mi
Hi, I am designing wide band lna and freq range is 0.7~2.7GHz am using noise cancelling technique, but gain is not flat. and linearity is poor in 0.7GHz than 2.7GHz. Is there possible to use shunt peaking inductor to get flat gain and how to improve linearity (I'm using CADENC for simulation)
hi the differential pair routing will help in cancelling out noise impact. so, even if it is analog signal we can use differential pair. i.e., the reason why we usually route the inputs of an op-amp as differential pair. hope this info. helps Regards
Hello Everyone; What is the function of feed-thru capacitors in RF modules? noise cancelling? Please answer.
hi I'm currently working on a project for multi-channel speech enhancement techniques. I've decided to work on Microphone Array using Delay-and-Sum Beamforming technique follow-up by adaptive noise cancelling. I've chosen to used MATLAB for the simulation. I have read lots of stuffs on these things and I believe I know the important stuffs. Howe
Hi, For short distances of few meters, you can simply twist ordinary 7 strand insulated wires and use them without any termination resistors. Twisted pair helps in cancelling induced voltages and thus keeps the noise at bay. For longer than 20 meters, better to use commonly available CAT cables containing twisted wires, which are used for com
I'm a new member to this forum.. Can anyone tell me the adv of signal avg over other noise cancellation techniques
please help me check the m-file about fuzzy logic using in noise cancelling. thanks! it exists some error: ans = 501.0015 ??? Index exceeds matrix dimensions. Error in ==> C:\MATLAB6p1\toolbox\fuzzy\fuzzy\genparam.m On line 80 ==> a = (range(i,2) - range(i, 1))/2/(mf_n(i) - 1); Error in ==> C:\MATLAB6p1\toolbox\fuzzy\f
The trick is in differential mode. The faster serial buses like USB, firewire, ethernet etc all use differential pairs for data. Differential mode offers a lot more noise rejection besides cancelling rise / fall time delays. If a parallel bus is designed with differential signal, it would be too expensive. But you can get very high data speeds.