Questions tagged [audio-engineering]

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I have a servo amp board (atleast that is what sony called it in the service manual) that I need to replace with a smaller alternative

As said in the title, I need to replace this board with a smaller alternative. I was hoping I could find someone who maybe knew more on the subject as my knowledge on circuits is a little limited. I ...
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3 answers
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How did this tape recording possibly happen on a technical and logical level?

Recently, I dug up an old C90 audio cassette from when I was a kid in the early to mid 1990s. It's possible that it was already a few years old then, used by my parents and possibly others. I set up ...
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Is it 8 kHz the minimum number of samples per second and can that be written into a sound player? [closed]

If someone wanted to reproduce a sound without any electronics in a small space and using a finger nail could it be possible? For example there are roads that have sounds embedded in them that would ...
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"ART FXR" reverb rack unit has a howling or whistling sound

Hello to all audio engineering and repair experts. I have a very old Applied Research Technology FXR digital effects processing unit. It's a double-processor unit that can function as dual mono (i.e. ...
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3 answers
84 views

Why do the "LINE OUT" connectors not seem to output audio, but "HEADPHONE JACK" does?

I have a "Clas Ohlson TCD-983WEC CDMP3". It's a cheap "multi-unit" music player bought maybe 10 years ago or longer. I'm using it exclusively for its (cheap) tape player, since my ...
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Is it possible that room noises could end up on the recording when recording audio from an analogue source?

I have a VCR with a tape cartridge playing in it. The video output (SCART/RCA) goes from the back of the VCR into my Elgato video capturing device's RCA cables. The Elgato device is then connected via ...
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Does Bitrate on sound files refer to bit/s or byte/s?

I'm trying to understand the bitrate calculation of a sound file(wav - uncompressed) which is showed in a mobile app. I've searched on the web and found out the ...
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2 answers
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How does microphone -> software work?

I've read this: "A microphone converts sound into a small electrical current. Sound waves hit a diaphragm that vibrates, moving a magnet near a coil. In some designs, the coil moves within a ...
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4 answers
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Is it possible to measure the "noise level" of an area without using actual microphones which can record actual audio?

In a way, I wish that the government had put up noise level measuring equipment in every populated area of the country, allowing me to see on a map which areas are the most quiet and peaceful over ...
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2 votes
2 answers
105 views

Is it possible for a microphone/sensor to detect soundwaves before it physically reaches the sensor?

I'm sorry if this is the wrong place to ask. I understand that for typical microphones, the sound waves need to physically reach the microphone and cause vibrations in the diaphragm before an ...
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Why would a "delayed loudspeaker" be so expensive in the 1970s?

Recently, I read about some major musical concert held somewhere in the USA to a record-large audience. Since there were so many people, not all could see or even hear the music from the main ...
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3 votes
1 answer
242 views

Arduino DAC to Speaker

I'm working with an Arduino Due's two DAC pins. I want to output to a single 4W 5.7Ohm speaker to test my code, with the intent of eventually outputting to a set of speakers (woofer, mid-range, and ...
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2 votes
3 answers
135 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 ...
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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 ...
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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'...
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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 ...
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1 answer
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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'...
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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 ...
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1 vote
0 answers
36 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 ...
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1 answer
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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 ...
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2 answers
493 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 ...
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4 votes
1 answer
746 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 ...
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1 vote
1 answer
166 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 ...
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3 answers
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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 ...
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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 ...
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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 ...
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2 votes
1 answer
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 ...
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1 vote
2 answers
124 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?
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4 votes
1 answer
122 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?
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2 answers
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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 ...
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2 votes
2 answers
316 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 ...
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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 ...
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8 votes
3 answers
6k 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 ...
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2 answers
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....
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5 votes
1 answer
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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 ...
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