Download APL Programming and Computer Techniques (VNR Computer by Harry Katzan PDF

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By Harry Katzan

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So 0 dBV is 1 V. 26 V. -40 dBV is 10 mV, and -60 dBV is 1 mV. This unit is perhaps the most appropriate measurement to use when specifying electronic audio signal levels. So, all of these units can be used to measure absolute electrical signal levels or relative gains and losses such as one might find when measuring systems. Acoustic Levels (dBSPL) Acoustic levels, the physical sound levels of actual noise sources, are specified by measuring sound pressure level. Again, the log dB unit is the correct one to use, but one must develop an absolute unit of measure.

For analog devices, the signal source is removed from the input of the device and replaced with a termination impedance. Typically, this replacement is a resistor with a value the same as the typical source impedance of the usual source device. For example, if the device being measured is a microphone preamp that is designed to amplify a low-impedance microphone, the typical microphone would have a source impedance of 150 ohms. So, the input should be terminated with a 150 ohm resistor. This termination impedance can influence the noise reading.

This evolution began with traditional home entertainment devices—surround sound receivers, DVD players, and “hometheater-in-a-box” systems—but is now migrating to the PC as the media center. The PC adds accessibility, connectivity, a sophisticated user interface, and expandability that the traditional receiver cannot match. Of course, now we’re back to the subject of this book: Intel High Definition Audio. Now that the consumer has experienced high quality audio with traditional home entertainment systems, they are not likely to settle for anything less when the PC becomes the entertainment center.

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