Optimod-AM 9400 V1.2 Operating Manual - Orban

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6-10 TECHNICAL DATA ORBAN MODEL 9400 IC211. The purpose of these stages is to reduce the out-of-band noise energy resulting from the delta-sigma D/A’s noise shaping filter and to translate the differential output of the D/A converter into single-ended form. These components apply a 3 rd order low-pass filter to the differential signal from the D/A. This filter does not induce significant overshoot of the processed audio, which would otherwise waste modulation. IC212B and associated components form a low-frequency servo amplifier to remove residual DC from the signal. The 0.15Hz 3 dB frequency prevents tiltinduced overshoot in the processed audio. The buffered output of IC2201 is applied to IC213, a balanced output line driver. This driver emulates a floating transformer; its differential output level is independent of whether one side of its output is floating or grounded. IC213 and its right channel counterpart IC214 are socketed for easy field replacement. All other circuitry is surface-mounted. The corresponding right channel circuitry and the circuitry in Analog Output #2 is functionally identical to that just described. 3. Digital Sample Rate Converters (SRC) and Output Transmitters Located on Input/Output Daughterboard For each of the two digital outputs, an integrated output sample rate converter (SRC) converts the 64 kHz 9400 system output sample rate to any of the standard 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz rates. The SRC chip drives a digital audio interface transmitter to encode digital audio signals using the AES3 interface format (AES3-1992). These chips are surface-mounted and are not field replaceable. DSP Circuit The DSP circuit consists of eight Motorola DSP56362 24-bit fixed-point DSP chips that execute DSP software code to implement digital signal processing algorithms. The algorithms filter, compress, and limit the audio signal. The eight DSP chips, each operating at approximately 100 million instructions per second (MIPS), for a total of 800MIPS, provide the necessary signal processing. A sampling rate of 32 kHz and power-of-two multiples thereof, up to 512 kHz, is used. System initialization normally occurs when power is first applied to the 9400 and can occur abnormally if the 9400’s watchdog timer forces the SC520 to reboot. Upon initialization, the SC520 CPU downloads the DSP executable code stored in the flash memory. This typically takes about 7 seconds. Once a DSP chip begins executing its program, execution is continuous. The SC520 provides the DSP program with parameter data (representing information like the settings of various processing controls), and extracts the front panel metering data from the DSP chips. During system initialization, the SC520 queries the DSP hardware about its operational status and will display an error message on-screen if the DSP fails to initialize
OPTIMOD-AM DIGITAL TECHNICAL DATA 6-11 normally. Please note any such messages and be ready to report them to Orban Customer Service. The DSP chips are located on the DSP board — see the drawings starting on page 6- 52. U701 and U702 are local voltage regulators on the DSP board that derive the +3.3V supply for the DSP chips from the system digital 5V bus. Power Supply Warning! Hazardous voltages are present in the power supply when it is connected to the AC line. The power supply converts an AC line voltage input to various power sources used by the 9400. To ensure lowest possible noise, four linear regulators provide 15VDC and 5VDC for the analog circuits. A switching regulator provides high current +5VDC for the digital circuits. An unregulated voltage powers the fan and feeds local regulators. The power supply circuits are straightforward and no explanation is required beyond the schematic itself. Be aware that C1, C4, C5, and C12 in the switching regulator are premium-quality low-ESR capacitors and must be replaced with equivalent types to ensure proper operation of the switching supply. The output of the power supply is monitored by the power-indicator LED circuit, which causes the power LED to flash according to a preset code to diagnose problems with the various power supplies in the 9400. See step (2.B) on page 4-8. Abbreviations Some of the abbreviations used in this manual may not be familiar to all readers: A/D (or A to D) AES AGC A-I A-O BAL BBC BNC CALIB CIT CMOS COFDM COM D/A (or D to A) dBm analog-to-digital converter Audio Engineering Society automatic gain control analog input analog output balanced (refers to an audio connection with two active conductors and one shield surrounding them). British Broadcasting Corporation a type of RF connector calibrate composite isolation transformer complementary metal-oxide semiconductor Coded Orthogonal Frequency Division Multiplex — a robust type of digital modulation using many narrow-bandwidth, low data rate, mutually non-interfering carriers to achieve an aggregate high data rate with excellent multipath rejection. serial data communications port digital-to-analog converter decibel power measurement. 0 dBm = 1mW applied to a specified load. In audio, the load
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Optimod-AM 9400 V1.2 Operating Manual - Orban

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