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Apple 2 manual 4Solving Audio Problems, Analyzing and Fixing Problems in an Audio File

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4Solving Audio Problems

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Audio files are sometimes less than perfect. You can correct annoying clicks, hum, and other file problems you find in your audio files with the Soundtrack Pro Analyze and Repair feature.

In this chapter, you’ll learn about:

ÂAnalyzing and Fixing Problems in an Audio File (p. 57)

ÂCreating an AppleScript Droplet to Analyze and Fix Audio Files (p. 60)

Analyzing and Fixing Problems in an Audio File

Soundtrack Pro can analyze and correct audio files for a variety of common audio issues:

ÂClicks and pops: Sudden, short peaks in the waveform can make clicking and popping sounds when played. You can increase the threshold parameter for searching to find fewer clicks and pops.

ÂPower line hum: Power line hum (usually occurring at 50 to 60 Hz) can be found and corrected.

ÂDC offset: DC offset, which is when the samples are not centered around zero, can be found and corrected.

ÂPhase: Usually caused by a distorted or inaccurate stereo image, phase issues usually show up as partial or complete cancelation of the left and right channels.

ÂClipped signal: Signal overloading, resulting in cut-off audio, can be caused by poor gain staging, surface damage to an analog recording, or other reasons.

ÂSilence: Silent sections of an audio clip can be found and corrected. You can define the silence by threshold or duration.

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Image 57
Apple 2 manual 4Solving Audio Problems, Analyzing and Fixing Problems in an Audio File
Page 56 Page 58

2 specifications

The Apple II is a defining product in the history of personal computing, first introduced in 1977 by Apple Computer, Inc. Designed by Steve Wozniak, the Apple II was one of the first highly successful mass-produced microcomputer products and played a significant role in bringing personal computers into homes and schools.

One of the Apple II's standout features was its color graphics capability. It was one of the first personal computers to provide color output, thanks to its built-in video interface. The initial model supported a resolution of 280x192 pixels with a palette of 6 colors, which allowed for vibrant visuals that set it apart from contemporaries like the monochrome Altair 8800.

The Apple II was notable for its open architecture. This design allowed users to expand the computer's capabilities easily through a series of expansion slots. Users could add floppy disk drives, additional memory, and various peripheral devices, making the system highly adaptable to individual needs. This encouraged a thriving ecosystem of third-party hardware and software, which contributed to its popularity.

Another significant feature was its use of the 6502 microprocessor. This 8-bit CPU was not only affordable but also powerful for its time, allowing the Apple II to run various applications efficiently. Along with a built-in keyboard and an innovative plastic case that housed its components, the design was user-friendly and appealing.

The Apple II also introduced the concept of “bootable software” through the use of floppy disks. The disk operating system (DOS) allowed users to store and run multiple programs without having to reload software manually, providing a level of convenience that had not been widely available before. Key software like VisiCalc, the first spreadsheet program, helped boost sales, showcasing the Apple II's utility in business and education environments.

The computer was also well-known for its early adoption of BASIC programming language. Apple provided an operating system that supported Applesoft BASIC, which enabled users, including students, to write their programs, further fostering a community of developers.

In summary, the Apple II's color graphics, open architecture, powerful 6502 processor, innovative use of floppy disks, and support for BASIC programming made it a revolutionary product in its time. Its legacy laid the groundwork for future personal computers and established Apple as a leader in the burgeoning tech industry. The Apple II remains an iconic symbol of the early personal computing era, reflecting a generation's transition into a digitally connected world.