Antex electronic SX-6, SX-34, SX-5e, SX-36 user manual

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milliwatt into 600 ohms, which is .775 volts RMS. dBV uses 1 volt RMS as the reference.

Digital Clipping

Digital clipping is the point where the Analog to Digital converter becomes saturated. The signal is “all ones”. For a 16 bit system, this is a value of +32768 or –32768. Digital clipping sounds nas- tier than analog clipping because of its abruptness. It has no re- gion where the distortion increases progressively.

Digital Volume Control

A digital volume control is one that scales the signal in the digital domain by multiplying by a fraction less than one. A volume con- trol which has a digital interface, such as up and down pushbut- tons, or a virtual slider on a computer screen, may operate on the signal in either the analog or digital domain. Only the specifica- tions of the device will tell you whether the control is actually digi- tal or analog. The digital type of volume control will degrade sig- nal to noise performance when used. If a signal is lowered by 6 dB, the signal to noise ratio is also lowered by 6 dB, effectively removing one bit of resolution. A digital volume control set at –48 dB will effectively turn a PCM16 signal into a PCM8 signal. Whether or not the decreased signal to noise ratio is acceptable or not depends on the particular situation.

Headroom

Headroom refers to the amount a signal may be above the nomi- nal signal before clipping occurs. Increasing headroom lowers the possibility of clipping on peaks, but degrades signal to noise ratio. Optimum headroom to have for a particular recording is very subjective and depends program material. Classical music usu- ally requires the greatest headroom. Headroom of 12 dB is a typical number.

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Contents September 17 Rev. E Antex Electronics CorporationTh Street GARDENA, CaliforniaDeclaration of Conformity Table of Contents SX-34 Mixer and Block Diagram SX-6 Mixer and Block Diagram Figures Card Installation IntroductionJumper Settings & Connections SX-5e,6,34,35 & SX-36 Jumper SettingsAddresses and Interrupts Making Connections to the CardPage SX-35/36 Connector Description SX-35/36 ConnectionsLine I/0 JP8 AUX in JP9 MIC JP7SX-34 Connector Description Output Header JP5AUX Header JP6 Microphone Header JP7Mono Header JP4 SX-6 Connector Description SX-6 ConnectionsLine OUT JP2 Microphone Input JP3SX-5e Connector Description Balanced and Unbalanced SignalsImpedance and Signal Levels Playback and Record Devices COMPRESSION, Data RATES, and Networks ISO/MPEG-1 Bitrates 32 KHz 44.1 KHz 48 KHz Driver Installation Windows Setup Tips Upgrade Driver, WINSetup Tips Upgrade Driver, WIN Windows NT Antex Application Software Installation Using Windows Demonstration Software Sample RateCompression Mpeg BitratesWave Device ChannelsVU Meters File Record/StopDual Device Operation VolumeInstalling and Using Multiple Cards in a System Mixer and Block Diagrams SX-36 Mixer and Block Diagram Page Page SX-36 Mixer SX-36 Block Diagram SX-34 Mixer and Block Diagram SX-34 MixerSX-34 Block Diagram SX-6 Mixer and Block Diagram SX-6 Mixer SX-6 Block Diagram SX-5e Mixer and Block Diagram SX-5e MixerPage SX-5e Block Diagram Antex Meter Antex MeterAntex Meter pull-down menu Antex Meter options Page Troubleshooting Files I record sound dull Files recorded are of poor quality There are dropouts or pops and clicksTECHNICAL/ORDERING Information Toll Free 800 Phone 310 FAX 310Terms Connectors for Male HeadersAppendix Page SX-36 SpecificationsAll Cards as applicable SX-34 SX-6SX-5e About Digital AudioPage Analog-to-Digital Digital-to-Analog
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