Questions tagged [audio-engineering]

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2
votes
3answers
65 views

Why does audio equipment buzz/humm when a long signal cable is used and how do I eliminate it?

I have two 5.1 speaker sets, one in the front and one in the back of my living room. I have connected them together with an "audio wire" (non-shielded unfortunately) that's 12 meters in length. Since ...
0
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2answers
100 views

How can I calculate the total signal level (noise) of PC fans?

I have a fan on a PC case running at 100% speed making 40dB/A of noise (sound pressure). Then I add a second fan right next to it running at 100% speed making 30dB/A of noise. What is the combined ...
1
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2answers
23 views

What causes the hiss from one audio source but not another over long cable?

I have pulled some CAT6 through the ceiling from one room to a nearby cupboard, for line level audio signal. See wiring: I haven't used a balun or DI box, and there isn't TOO much hum and hiss, it'...
-1
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2answers
31 views

What approaches for soundproofing for this situation?

I am trying to learn soundproofing on wiki (please let me know if there exists any other oninle tutorials). There are several basic approaches to reducing sound: increasing the distance between ...
0
votes
1answer
45 views

Do kids under a certain age not hear the warning beeps that smoke detectors make when they are running out of battery power?

I've always been very annoyed by those regular single beeps that smoke detectors start doing increasingly often as the batteries start to run out, to warn the user to replace the batteries. Lately, I'...
-1
votes
1answer
29 views

C++ simulate physical audio output

I am searching for help with simulating a physical audio device and get its input from the OS (mainly Windows and Linux). Couldn't find any information about this so far. The idea is to block the ...
1
vote
0answers
33 views

What's the best way to get an ultrasonic sensor that can vary its operating frequency

Long story short I'm looking to build an ultrasonic sensor that can also be used to communicate with a seperate sensor. (So it must be able to send out a pitch around ~42kHz, but also alter the pitch ...
0
votes
1answer
46 views

Using the bitrate value on a calculation is causing contradiction, why?

Do you have any idea on why the Calculation 1 below doesn't match? Reference: Audio buffers: frames, samples and channels ...
0
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2answers
290 views

Microspeaker enclosure design for headphones

I want to embark on an acoustic project of designing an enclosure for some 40mm microspeakers, identical to ones found in a typical on-ear headphone solution. Are microspeaker enclosures treated in ...
4
votes
1answer
412 views

Making my microcontroller transmit audio to any bluetooth headphones/speakers

I am creating a microcontroller on a custom PCB design for an MP3 player. I would like to consider integrating bluetooth into it. When I say integrating bluetooth into it, I specifically mean ...
1
vote
1answer
85 views

Adding an R2R Digital to analog converter inline with TRS connector

I am trying to create a simple R2R DAC, maybe 8-16 bits. I want to be able to that type of DAC inline to a headphone line. Since the an 8 bit R2R DAC will need 8 pins, how exactly do I wire up a TRS ...
0
votes
3answers
51 views

Microphone angled waterproofing

We are working on a mounted screen design that will have microphones at the bottom of the screen housing. The screen housing will be sitting at a 10.5 degree angle. So we are worried about water ...
1
vote
2answers
54 views

Could a magnetic audio tape recorder/player be made using a vibrating permanent magnet?

Cassette tape players use a read head where the magnetic field from the tape is directed through an induction coil. The induced current in the coil is then amplified and sent to the speakers. Now I'm ...
0
votes
1answer
221 views

Audio frequency sweep spectrogram artifacts… hints?

I'm wondering how to interpret artifacts on spectrograms like the following which shows the recording of a linear frequency sweep. In this case: The recording is done with a cheap microphone and ...
2
votes
1answer
50 views

Acoustic transmission through houseboat hulls

The short version is: should I be worried about bass transmission through water into my neighbors' hulls? I am renovating a small houseboat (12x30 ft) to live on. It is one large room, and I plan on ...
1
vote
2answers
98 views

How does electricity flow through this kind of vacuum tube?

Does the current flow from the bottom left pin to the bottom right pin, or from the bottom pins to the cap on top?
4
votes
1answer
113 views

What is that airplane headphone socket?

I recently flew on a A380 and I saw this interesting socket. Could someone explain to me what is the purpose of these 4 golden connections?
0
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2answers
108 views

Sound insulation, absorption and diffusion. Can they be part of the same process when wanting to both soundproof and acoustically treat a room?

I understand that insulation, absorption and diffusion in acoustics are different concepts. Notwithstanding, would it be correct to assume they may be part of the same process when all are used to ...
2
votes
2answers
299 views

Acoustical Design considerations for Active Noise Cancellation Project for Air vent [closed]

I am working on ''Active noise cancellation for air vent'' project. I am using NI myRIO1900 it has FPGA module(Xylinx Z-7010) , Audio Technica ATR 3350 omni directional microphones and Tevion ...
3
votes
2answers
558 views

What type of test signal is appropriate for frequency response analysis of string instruments?

I want to test the frequency response of stringed musical instruments . My test set-up includes a piezo film transducer which is just taped onto the instrument and fed a signal which then vibrates the ...
8
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3answers
4k views

Is there a mechanical equivalent to a hi/low pass filter (as in electrical engineering)?

I have been wondering if there are certain media (for instance glass, air, foam, etc.) which are peculiar given their chemical composition and/or structure allowing them to filter out mechanical waves ...
0
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2answers
2k views

Powering LED light using smartphone headset jack

Would it be possible to power a small LED light using the headset jack of a regular smartphone, and if so, how would you connect the LED light with an audio jack. How would such an implement look like....
5
votes
1answer
565 views

Is active noise cancellation useful in vehicles?

The cabin noise of vehicles is a large concern in the luxury market. Why haven't any automakers used the same techniques as are employed in active noise cancelling headphones. In these devices a ...