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Table of Contents
- 1 Dbx Type IV™ Conversion System Overview
- 2 Dynamic Range and Analog Recording
- 3 Digital Conversion Shortcomings
- 4 Dbx Type IV™ Conversion System Functionality
- 5 Logarithmic Mapping and Overload Region
- 6 Preservation of High-Frequency Detail
- 7 Benefits of Dbx Type IV™ Conversion
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Table of Contents
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Summary of Contents for dbx Type IV Conversion System
- Page 1 Type IV™ Conversion System White Paper Roger Johnsen ®...
- Page 2 16-bit systems is in the neighborhood of 90-something dB. Compare this to the typical signal-to-noise specifications for professional analog tape of about 55 dB without the aid of noise reduction and around 75 to 85 dB with noise reduction such as dbx Type I™ or Type II™ applied.
- Page 3 A/D converters has improved significantly in recent years. The dbx Type IV™ Conversion System takes advantage of this and utilizes the top 4 dB of the A/D converter’s linear dynamic range to create a logarithmic “overload region.” This allows high-level transient signals passing far above the point where the overload region begins to be adequately represented in just 4 dB of the converter’s dynamic range, whereas...
- Page 4 Type IV™ Conversion System Converted Signal Level dB FS A/D Clip Point Input Signal Level Figure 1 - Converted Level vs. Input Level 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.
- Page 5 With dbx Type IV™, its mapping preserves high- frequency signal information, as illustrated in Fig. 3d, since the signal is confined within the Type IV™...
- Page 6 Type IV™ Conversion System Amplitude A/D Clip Level Time A/D Clip Level Figure 3b - Signal of Fig. 3a Going Beyond the A/D Clip Level Amplitude High-Frequency Information Completely Lost High-Frequency Content A/D Clip Level Low-Frequency Content Time A/D Clip Level...
- Page 7 A/D noise level! So what you get is free headroom! The benefits of the dbx Type IV™ Conversion System can easily be heard by switching it in and out while listening to signals with high-level peaks captured in the Type IV™...
- Page 8 ® 8760 South Sandy Pkwy. Sandy, Utah 84070 Phone: (801) 568-7660 Fax: (801) 568-7662 Int’l Fax: (219) 462-4596 Questions or comments? E-mail us at: customer@dbxpro.com or visit our World Wide Web home page at: www.dbxpro.com A Harman International Company...
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