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In the course of discussions with other iPhone developers, I ve met a surprising number of people who don t simply prefer to stick to Objective-C for iPhone development but who regard pure C APIs with something approaching fear and dread. If that s not you, fantastic, but it s an attitude that I ve encountered much more than I would have expected. For some people, this feeling goes so far that they d prefer not to do something if using C is the only way. I m not sure what the source of this feeling is, but if you re going to use Core Audio, you ll need to recognize one very important detail: Core Audio is entirely a C-based API. No Objective-C is involved. Of course, Objective-C is a proper superset of C, so you already know C at least as well as you know Objective-C. You will, of course, have to use C-style arrays instead of NSArray, and you ll encounter malloc/free-style memory management. Not to mention potentially using pointers in new and unfamiliar ways. The callback function shown in Figure 3-2 is a C function that you would implement. But you can and should use Objective-C for most other aspects of your application, and Core Audio code will integrate well. If this sounds dangerous, error prone, or just distasteful, relax. You can do this. There is no monster hiding under this bed.

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Subscriber 1: 0 4,000 Hz Subscriber 2: 4,000 8,000 Hz Subscriber 3: 8,000 12,000 Hz Subscriber 4: 12,000 16,000 Hz Subscriber 5: 16,000 20,000 Hz

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

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If you ve done any significant amount of iPhone development work, you ve probably run across cases where the iPhone Simulator differs from working on a real iPhone or iPod touch. Often it s something obvious like the lack of a camera or the fact that the simulator s Core Location data always shows the current location to be at Apple s headquarters. With Core Audio, it s less obvious but no less important. Developing Core Audio code on the iPhone Simulator is a recipe for frustration and confusion, because although code often fails to work as expected, it doesn t fail in a manner that s immediately obvious as being a simulator issue. You may find, for example, that a key Core Audio function call never returns, for no readily apparent reason, and that while

more efficient systems that will be discussed later, is still used in analog cellular telephone and microwave systems, among others This model worked well in early telephone systems Because the lower regions of the 300 to 3,300 Hz voiceband carry the frequency components that allow for recognizability and intelligibility, telephony engineers concluded that while the higher frequencies enrich the transmitted voice, they are not necessary for calling parties to recognize and understand each other This understanding of the makeup of the human voice helped them create a network that was capable of faithfully reproducing the sounds of a conversation while keeping the cost of consumed bandwidth to a minimum Instead of assigning the full complement of 10 KHz to each end of a conversation, they employed filters to bandwidth-limit each user to approximately 4,000 Hz, a resource savings of some 60 percent.

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it s busy doing who-knows-what it also draws 90 percent or more of your Mac s CPU. Application bugs are often your own fault, so it s natural to try to analyze your code to see where you went wrong. But then you try the same code on a phone, and it just works. I ve filed bugs with Apple about this, but as of this writing, they re unresolved in any released version of the iPhone SDK. With any luck the situation will improve in a future release. Until then, if you choose to work in the simulator and you find that your Core Audio code is not working quite as expected, try working on a real device first before spending too much time trying to find the bug. Listing 3-8 shows a class declaration for a class that uses Audio Queue Services to play audio files. A number of instance variables are necessary to track audio format and maintain the audio queue. Property declarations are a matter of style, but some kind of setter and getter methods will be useful later.

Within the network, subscribers were frequency-division multiplexed across shared physical facilities, thus allowing the telephone company to efficiently conserve network bandwidth Time, of course, changes everything As with any technology, there were downsides to frequency-division multiplexing It is an analog technology and, therefore, suffers from the shortcomings that have historically plagued all transmission systems The wire over which information is transmitted behaves like a longwire antenna, picking up noise along the length of the transmission path and very effectively homogenizing it with the voice signal Additionally, the power of the transmitted signal diminishes over distance, and if the distance is far enough, the signal will have to be amplified to make it intelligible at the receiving end.

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