Audio processing on Android

Over the past several years, mobile has become the go-to platform for most people’s media consumption. From audio playback to movie streaming, there is a growing amount of content available in your pocket and on your tablet, and the market is still expanding.

Creating a responsive audio DSP application in Android can be a huge pain due to the fact that there is no easy way to manipulate the audio framework in the Java layer.

Your voice, at the bottom, is a sound, similar to what a musical instrument produces. Thus, what you need is a tool to process an audio signal which you could fully use while developing your Android app. First, you need to understand that studio equipment and a mobile device are third-party different things. If to speak about modern software designed to work with audio data, you should know that such applications are quite pricy. Moreover, they require the compute capacity of a desk-top computer, which post-processing exceeds the capabilities of an average tablet or a phone.

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Particularly in a creative capacity, tablets are quickly replacing laptops for music creation and live performance uses. Not to mention that there’s a whole market for digital effects, which can be purchased at much lower costs than traditional analog equipment.

The convenience of an audio processing app is realized in its compatibility with a variety of different file types. Usually, when trying to access more raw data files, you would need to convert tracks with a third-party file converter — this tends to be tedious and not always a great option. With an audio processing app, specifically an app like Audio Mastering a lot of the conversion leg work is resolved.

Our mobile phones are more than powerful enough for simple playback tasks. However, as processing power has increased, we have also begun to demand more signal processing from our mobile devices, at a lot more of it in real-time, too. Even when we are playing a game, every sound file takes time to be pulled from memory, converted from binary information to numerical values, before being pushed to a DAC, takes up valuable clock cycles. Additional post-processing, such as passing the file through your optimized EQ settings or supplementing the sound with extra reverb, takes up even more time, and modern applications are becoming increasingly complex.

Audio processing apps allow you to see exactly what your audio files are doing. Apps like Level.24 give you access to audio data found only in actual recording software a great addition to any mobile tool belt in need of more comprehensive EQ and sound layouts.

Finding the right audio processing app is completely up to your application. It is also essential that you have the right gear to use the app correctly some apps require USB sound cards or competent audio jacks to take advantage of all of the app’s features. Follow through to the slideshow to see this collection of professional audio processing apps.

android, audio, app

TarsosDSP 

TarsosDSP is a Java library for audio processing. Its aim is to provide an easy-to-use interface to practical music processing algorithms. The library tries to hit the sweet spot between being capable enough to get real tasks done but compact and simple enough to serve as a demonstration on how DSP algorithms works. TarsosDSP was written in Java to allow portability from one platform to another. The automatic memory management facilities are a great boon for a system implemented in Java. TarsosDSP serves an educational goal, therefore the implementations of the algorithms are kept as pure as possible, and no obfuscating optimizations are made. Readability of the source code is put before its execution speed, if algorithms are not quick enough users are invited to optimize the Java code themselves, or look for alternatives, perhaps in another programming language like C++. This is a rather unique feature of the TarsosDSP framework, other libraries take a different approach.

The AudioRecord class manages the audio resources for Java applications to record audio from the audio input hardware of the platform. This is achieved by “pulling” (reading) the data from the AudioRecord object. As with many implementations accessing hardware functionalities on Android, the very first thing we need to care about is the huge number of different configurations that Android devices can have.

 This application is responsible for polling the AudioRecord object in time in order to access the recorded data stream. Thankfully, TarsosDSP already provides the needed mechanism for pulling this data and feeding to one of the audio stream processors

SoundTouch Audio Processing Library

SoundTouch is an open-source audio processing library that allows changing the sound tempo, pitch and playback rate parameters independently from each other. For example, Sound tempo can be increased or decreased while maintaining the original pitch. Or Sound pitch can be increased or decreased while maintaining the original tempo.

android, audio, sound

The library is an Open Source project and isn’t an SDK for any specific platform. The developers claim that their tool will work on Windows, Mac OS, Linux & other *nixes, Raspberry Pi, Android, Apple iOS. The library only works with files. The original WAV-file is processed and is saved as a separate one. In order to hear the result of the implemented affects you have to play the newly created file. There is no real-time automatic sound optimization and sound processing on the fly.

Bongiovi DPS SDK

The product is a fully-fledged SDK with the ability to be used both in iOS and Android projects. It is a toolkit for those who want to create their own Audio Enhancer. Audio Enhancer is a real-time processing of the file being played – the application of the common audio effects. In case you have a desire to please the market of media players for portable devices with your product which will have it’s own sounding and various presets, this SDK will be quite of use to you. Additionally,  such tools aim at making the sound being played richer. Naturally, the usage of a quality acoustic system or headphones is expected.

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