AAudio and MIDI Basics

A Appendix

 

This appendix offers a brief overview of MIDI and digital audio basics.

If you want to know what an audio file is, how audio is converted into (and from) computer information, and what this MIDI thing is all about, you’ll find it here.

MIDI

MIDI is an acronym for Musical Instrument Digital Interface. To break this down further—the Musical Instrument part of MIDI refers to electronic musical instruments such as synthesizers, samplers, and even MIDI guitars. The Digital Interface part sounds technical, but really isn’t.

Basically, MIDI’s Digital Interface is broken down into two components.

ÂMIDI is a computer-based language—and as you probably know, computers talk digitally. MIDI keyboards, modules, and cards are actually computers in disguise.

ÂMIDI’s Interface is just that. MIDI is a hardware standard which consists of a set of physical connectors labeled IN, OUT, and THRU. You will find one or more of these connectors on all MIDI devices, such as keyboards or modules.

The MIDI Language

The “language” of MIDI is understood by all MIDI devices. The purpose of the language is to translate your musical performance into information that can be understood by a computer. (Don’t forget that MIDI keyboards and modules are actually computers in disguise).

When you play your keyboard, or Logic is playing a MIDI song file, MIDI information— which “describes” your performance—is transmitted as a string of MIDI messages. These messages are instructions which tell any connected synthesizer or sound module how to play a piece of music. The synthesizer or module receiving the MIDI data actually generates the sounds that you hear.

Important: MIDI does not send sounds. It only sends instructions.

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Apple 8 manual AAudio and Midi Basics, Midi Language

8 specifications

The Apple iPhone 8, introduced in September 2017, marked a significant evolution in the company's smartphone lineup, bridging the design elements of the past with cutting-edge technology. The iPhone 8 brought several notable features and advancements that enhanced user experience and performance.

One of the most striking design elements of the iPhone 8 is its glass back, a departure from the aluminum unibody design of its predecessors. This transition not only provided a fresh aesthetic appeal but also enabled wireless charging, allowing users to power their devices conveniently without the need for cables. The iPhone 8 supports Qi wireless charging standards, making it compatible with a wide array of wireless charging pads.

Under the hood, the iPhone 8 is powered by Apple’s A11 Bionic chip, which features a six-core CPU. This powerful processor significantly improved the iPhone's speed and efficiency when compared to previous models. The A11 Bionic was designed for machine learning applications and includes a dedicated neural engine, allowing for better performance in tasks such as image recognition and augmented reality experiences.

The display of the iPhone 8 is a 4.7-inch Retina HD display, boasting True Tone technology, which adjusts the screen's white balance based on the ambient light. This feature not only enhances color accuracy but also improves comfort for users by reducing eye strain in various lighting conditions. With a resolution of 1334 x 750 pixels, the display delivers sharp and vibrant visuals.

Camera capabilities on the iPhone 8 also received significant upgrades. The rear 12-megapixel camera features optical image stabilization, providing clearer photos and smoother video recording, even in low light conditions. The introduction of new color filters and a larger sensor allowed for improved photo quality. The front-facing 7-megapixel camera supports 1080p HD video recording and features advanced portrait mode, offering users new ways to create professional-quality selfies.

Another important aspect of the iPhone 8 is its robust security features. The device continued to use Touch ID for biometric authentication, ensuring that users' data remained secure. Additionally, the iPhone 8 was water and dust resistant, rated IP67, which added an extra layer of durability.

In summary, the Apple iPhone 8 successfully combined innovative technology with timeless design. Its wireless charging, powerful A11 Bionic chip, enhanced camera features, and sturdy build quality made it a compelling choice for consumers looking to experience the best of Apple’s engineering prowess.