Questions tagged [signal-processing]

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10
votes
7answers
77k views

How to create the muffled sound effect like hearing through walls?

I don't know what's the correct technical audio term for it. How do you create the sound effect to simulate hearing a sound source from far away through thick walls? Kinda like you would hear standing ...
9
votes
3answers
4k views

Can I record a sound frequency I can't hear and play it back so I can hear it?

Can I record a sound frequency I can't hear and play it back so I can hear it? If yes, How?
8
votes
1answer
825 views

In which situations is Audio Expansion applied (opposite of compressors)?

I've encountered from time to time some plugins that allows a threshold and a ratio to be set so that quieter sound can have an even more quieter level (or silenced altogether). Ableton Live actually ...
7
votes
4answers
3k views

Understanding Convolution Reverb

This question is more for me to understand the uses of convolution reverb, how to perform it, and clear up any misconceptions I have. As I understand it, to create a convolution impulse you: Set up ...
6
votes
4answers
5k views

What's the shortest sound perceptible to the human ear?

How long would the shortest perceptible sound last? I'm guessing there'll be a frequency at which we can hear short sounds best but I don't need to find that. Admittedly this is also completely ...
5
votes
9answers
2k views

Hmmm what about Sound Design talk? (jet engines)

OK I'll try to change the typical "what's the best mic, best recorder, etc." question and ask something about Sound Design!!! To the point now! I have to make a sound like jet engines (airplane fight ...
5
votes
3answers
79 views

How to improve guitar tone for recording?

first post: I've been recording/producing for 4-5 years but I've always struggled to get electric guitars to sound the way I want them and I'm wondering what I can do to improve that. (also done ...
4
votes
5answers
647 views

Outboard Processing/Pedals?

As the march of virtualization continues, I've ditched most of my effects boxes and pedals in favor of plug-ins. Who hasn't, right? But some mad scientists' creations just can't (or simply aren't) be ...
4
votes
3answers
150 views

What do various sounds look like on the wave spectrum

I am trying to understand some basics of the acoustic theory. Can someone in their own simple words explain what are the differences between the waves on two different instruments playing the same ...
4
votes
5answers
274 views

How to amplify mans voice in a noisy recording?

There is a party and as usual people are grouped. We have 2 groups - in first there is a woman who is telling a story at the moment. In second, there is a man, telling interesting anecdote. We have 7 ...
4
votes
1answer
2k views

What's the difference between a vocoder and a harmonizer?

As a follow-up to this question: https://video.stackexchange.com/questions/351/what-is-the-difference-between-autotune-and-a-vocoder, let's get into the nitty-gritty about vocoders and harmonizers. ...
4
votes
2answers
261 views

Logic Pro Environment: Panning Signal Processing

I'm trying to send an arpeggiated audio signal (in logic pro 9) into separate signal streams to creating an automated, synchronised panning effect, in one stereo channel. Problem 1: The audio signal ...
3
votes
3answers
373 views

Low Pass Filter?

I've constantly heard about the Low-Pass (or High-Pass) filter, but I am confused. I read that it works on cancelling out certain frequencies that are below (or above) a certain threshold. However, I ...
3
votes
1answer
128 views

Recording multiple microphones tightly synchronised

I would like to record sound from multiple microphones (at least 3) to a computer, tightly synchronised in time. This is for some research into signal processing. Specifics of what I'm looking for: ...
3
votes
1answer
10 views

Ascending Hi Cut Filter?

I Tracked a guitar track and for a certain section there is a transition guitar part, and it would sound amazing with an ascending hi cut filter, but i have no idea how to implement that into the ...
3
votes
3answers
1k views

What is best way to record a doublebass in a home studio enviroment?

What is best way to record a Doublebass in a home studio enviroment? What type of mic? What kind of processing? (compression? eq?)
3
votes
2answers
57 views

Removing tonality: antitune

What kind of processing would you apply to an audio track to remove its tonal quality (its pitch), leaving sound with the same texture as the original but ambiguous pitch? For example, a drum sound ...
3
votes
2answers
29 views

Smoothing transitions between sound clips

Is there a tool that allows the smoothing of a digital audio signal? For example, if I have hundreds of very different short audio clips one after another and I want the transitions to be smooth so ...
3
votes
1answer
38 views

Combining two clicky copies of the same record into one good recording

I have two copies of a Belgian 45 RPM single that are both rather clicky even after being washed. The pops occur throughout, stochastically, but occupy a small fraction of the overall time, such that ...
3
votes
2answers
210 views

Audio Signal Difference Extraction

I'm from visual arts background and so, I'm not familiar with technical aspects of sound design. But I'm exploring and learning everyday. Currently, I'm working on a sound art project, for which I'd ...
3
votes
1answer
134 views

How do I find the common audio between mp3 audio tracks?

I have a folder of nearly identical .MP3s, but each with a different voiceover mixed in. I'm trying to dump the tracks without the voiceovers. I've tried aligning two of them to the nearest sample, ...
2
votes
6answers
876 views

Who is using a vocoder these days and how?

This wonderful little device has stood the test of time but rarely does it make its way into my sound design bag o' tricks. Who has good tips or stories? Btw, my version of a vocoder comes by way of ...
2
votes
2answers
355 views

Raw Audio Edit Process

Hey everyone! I've been trying to refine and improve my sound editing process/skills and have been working from Ric Viers 'L-I-S-T-E-N' process from 'The Sound Effects Bible' (pg 187 for those of you ...
2
votes
2answers
6k views

Which DSP / VST / AU / RTAS external units exists to offload audio processing from internal CPU?

I'm looking for a list of products that allows the user to install and run their own purchased VSTs, AU, RTAS or any other kind of audio plugin - on an external device dedicated for running virtual ...
2
votes
7answers
3k views

Video As Audio?

Apologies if this is outside the purview of this forum, but I thought that if people here are doing fun things with all kinds of sound, why not? I'm curious to know if anyone here has used a video ...
2
votes
1answer
39 views

How do I capture or create first-person audio?

I was wondering how I might capture or create audio which sounds like it's being heard first-person. For example, there's a scene in Being John Malkovich where the viewer sees through Malcovich's ...
2
votes
2answers
17 views

How to fix an audio-set with wrong levels

I have a set of 300 audios. I use those files in an App, as the voice of an animated character. So, the thing is, that I can't find a process that take the audio, and "normalize" its levels to make a ...
2
votes
2answers
120 views

Highly Directional Close up Microphone

I would like to record specific audio for the following scenario. I have a piece of equipment that rotates a drum via an electric motor. The drum contains food product that is heated by air entering ...
2
votes
1answer
156 views

What do you call someone who programs software for producing, reproducing or processing audio?

What type of education do these people usually have? I have heard that they need to understand circuits because a lot of the software is modeled after analog gear. I am currently in semester 2 of an ...
2
votes
1answer
162 views

Selective amplification of a voice signal

In many TV programmes, the director is speaking to the show host via an ear-piece that the host is wearing, and at many instances, what is being said through that ear-piece is more or less audible ...
2
votes
1answer
232 views

How to amplify & clean up a weak reel-to-reel recording for converting to digital?

I am in the process of converting old reel-to-reel and cassette tape recordings to digital. One reel-to-recording from the early 70’s of my first band is real weak. When I amplify the sound the tape ...
1
vote
3answers
262 views

What causes the limitation on excessive analog signals vs. digital signals?

In the digital world, "clipping" would occur when a signal passes above 0db. But if you are dealing with analog equipment, is there a certain "ceiling" that tends to "brickwall" the signal down as ...
1
vote
2answers
8k views

how to remove sound clipping in existing record

I have an old record that has some clipping effect that happened during recording. This is a song, so i can't just cut out all frequencies probably ... is there any smarter way around to get rid of ...
1
vote
2answers
438 views

Mathematically what does phase reverse do on a signal?

In a stereo sound, phase reverse one channel and add it to another channel, we will cancel out those centered components. Mathematically what does phase reverse do on a signal? Can you explain that ...
1
vote
1answer
25 views

Time resolved sound measurment

I had a question about sound measurement in air using a B&K microphone. In the acquired time resolved sound measurement signal I can see both negative and positive voltages/ pressure values. I ...
1
vote
1answer
434 views

What you need to know to create a software synth?

Which areas of expertise do you need to know about to create a flexible software synth? Signal processing? Sound engineering?
1
vote
1answer
868 views

How to do frequency or spectral subtraction of two audio tracks?

I want to know how it's possible to substract one audio track from another. Meaning that you cut out the frequency spectrum of a audio file from another. I know how the phase inversion trick used to ...
1
vote
2answers
468 views

Vocal Disguise Effect

Any suggestions on how to achieve an "Anonymous Vocal Disguise" Effect? Along the lines of: "Ransom Phone Calls" or "Anonymous TV Interviewee". I haven't started to experiment yet, seems to be a bit ...
1
vote
3answers
282 views

creating a gradual 'frequency unification' effect (or illusion)

hello, i'm working on material with rather rich frequency range. now i've reached a point in the process where i need to design a gradual transparent effect which would make this wide-ranging sonic ...
1
vote
1answer
33 views

Is it legitimate to use a low pass filter on short segments of audio around stitch between two amplitude signals to remove noise?

I am trying to design a pipeline that will repeat a certain segment of audio N times (for instance, for 10s of input, repeat the segment from 3s to 5s four times). This generates unwanted high ...
1
vote
2answers
715 views

Converting audio recording to numeric values representing how loud the audio is at a given time

Warning: Complete audio beginner Background: I have audio recordings that were recorded through a mobile device using an app. I need to write a program that takes the audio and finds periods of ...
1
vote
3answers
88 views

Ceiling speakers central switch

I have 16 2-way ceiling speakers (2-way speaker, RMS: 30W, Max: 60W, 8 Ohm (coax, polypropylen membrane)) and I would like to have a box, to which I could connect them all and 1 (maybe more) input ...
1
vote
0answers
45 views

Is baffle-step compensation obsolete because of room correction?

When installing speakers in or on wall, are baffle-step correction circuits now unnecessary? Would there be any benefit to continuing designing speakers to compensate in the crossover, or is it ...
1
vote
0answers
122 views

Differentiate LIVE(REAL) and RECORDED voice [closed]

I am working on a project in which the system has to allow only the right person to access the vault. How can I make the system to understand and differentiate a recorded voice and a real human's ...
1
vote
6answers
3k views

i need a singer simulator or virtual singer?

i am going to generate artificial human voices like a singer do you know a tool with such ability ? like this
1
vote
1answer
32 views

Do I need an amplifier to listen to the signal audio coming from a DAC?

I'm planning to use a DAC (digital-analog converter) to convert signal from an optical/toslink connection (Apple TV) to my speakers with 3.5 analog jack. I'm wondering if I need an amplifier or if I ...
1
vote
0answers
120 views

Adverse effects on soundfields from plug-in processing

I've heard tales of plug-ins and effects processes doing bad things to the spatial perception of a soundfield. Of course, most of those tales come out of the music industry, where a mastering engineer ...
0
votes
1answer
215 views

Can a software generate a “midi” track from a song of musical notes of different instruments thanks to some filters? [closed]

Everybody knows those goofy special graphical effects generated by media player when you listen to a song. I never really liked them because they seem random and don't seem to synchronize with the ...
0
votes
1answer
49 views

Quick and dirty demo creation for hearing loss presentation

What is a quick and dirty way to put in a filter and in two signals for a hearing loss presentation? I want to take a song, say an mp3 of Louis Armstrong's What a Wonderful World, and I want to add a ...
0
votes
1answer
28 views

What's the easiest way to utilize the stereo tracks on my Zoom L-12 as microphone inputs?

I have a Zoom Livetrack L-12, and I'd like to to use the two stereo channels as individual microphone channels. Obviously, I will need a microphone preamp for each of these channels in order to do so. ...