DBX Type IV Conversion System White Paper

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[Page 1] dbx Type IV Conversion System

dbx Type IV™ Conversion System White Paper Roger Johnsen ® ...

[Page 2] dbx Type IV Conversion System

The dbx Type IV™ Conversion System is a proprietary analog-to-digital (A/D) conversion process that combines the best attributes of digital conversion and analog recording processes to preserve the essence of the analog signal when it is converted ...

[Page 3] dbx Type IV Conversion System

wrap-around occurs, not to mention that A/D converters have their own nasty side effects such as going unstable when their modulator is overdriven with high-level signals. This shortcoming of digital conversion has drastically affected the way users ...

[Page 4] dbx Type IV Conversion System

Fig.2 illustrates the mapping function in a different way. Input levels are shown on the left of the graph,while converted levels are shown on the right. Notice the mapping of large signal excursions to the 4 dB “Type IV™ Over Region.” L o g a...

[Page 5] dbx Type IV Conversion System

One might question the validity of such an approach—trying to represent a lot of signal information within a smaller “space.” The reason why this is not only valid but makes a whole lot of sense is that the digital codes in a converter are line...

[Page 6] dbx Type IV Conversion System

Type IV™ Conversion System White Paper - August 1998 Page 5 ® Figure 3b - Signal of Fig. 3a Going Beyond the A/D Clip Level Amplitude Time A/D Clip Level A/D Clip Level Figure 3c - Disproportionate Loss of High-Frequency Information Due to Clipp...

[Page 7] dbx Type IV Conversion System

Now you’re probably wondering, “What’s the catch? I can’t get something for nothing so what did I give up?” You may be worried that your A/D noise floor got 4 dB worse because we borrowed the top 4 dB of your converter. This is certainly a...

[Page 8] dbx Type IV Conversion System

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