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AMU2481 Scheda tecnica(PDF) 3 Page - Micronas |
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AMU2481 Scheda tecnica(HTML) 3 Page - Micronas |
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3 / 25 page  AMU 2481 MICRONAS INTERMETALL 3 Audio Mixer Note: If not otherwise designated the pin numbers men- tioned refer to the 24–pin DIL package. 1. Introduction The AMU 2481 Audio Mixer is a digital real–time signal processor in NMOS technology, housed in a 24–pin Dil plastic package or in a 44–pin PLCC package. It is de- signed to perform digital processing of both TV audio in- formation and digital audio data supplied by the DMA 2271 D2–MAC Decoder. The architecture of the AMU 2481 combines two main blocks: – I/O blocks – DSP block The I/O blocks are used to manage the input and output of audio information. The DSP block consists of a mask– programmable digital signal processor, whose software can be controlled by a microprocessor (CCU) via the IM bus. So parameters like coefficients can be modified during performance. By means of the DSP software, au- dio functions, such as deemphasis, oversampling mix- ing and volume control are performed. Fig. 1–1 gives an overview over the AMU’s functions. 1.1. Application of the AMU 2481 The AMU 2481 Audio Mixer is designed to interface with INTERMETALL’s ADC 2311 E Audio A/D Converter, DMA 2271 D2–MAC Decoder on the input side, and with the APU 2471 or the ACP 2371 Audio Processors on the output side. It can receive digital audio data in two differ- ent formats: Via the PDM inputs, the AMU 2481 is supplied with two 1–bit PDM data streams produced by the ADC 2311 E Audio A/D Converter which receives analog audio infor- mation either from the SCART interface (Euro connec- tor), which is used, e.g., for video recorder connection, or from any terrestrial TV transmission. For this input for- mat, decimation filters are provided in the AMU 2481, which convert each PDM stream into a 16–bit word at a sampling rate of approximately 32 kHz. Via the S bus interface the AMU 2481 receives serial audio data, provided, e.g., by the DMA 2271 D2–MAC Decoder. Fig. 1–2 shows how the AMU 2481 can be used togeth- er with the mentioned ICs of INTERMETALL to realize multistandard audio processing with PAL and D2–MAC signals. In the following descriptions data coming from the ADC will be called “PDM data” and data coming from the DMA will be called “S data”. Deemphasis J17 Deemphasis 50 µs Deemphasis J17 Oversampling Channel 4 S H A L Fig. 1–1: Functional block diagram of the AMU 2481 S Bus S–C I/O S–DIN S–I I/O Preemphasis S H A L S H A L S H A L Channel 4 Channel 3 Channel 2 Channel 1 Preemphasis Preemphasis Preemphasis –3 dB –3 dB –3 dB –3 dB dig. Vol. DAC 1 Vol 2 dig. Vol. DAC 2 S B u s CF par. ser. DA DID CL VISB RESET IREF2 IM Bus Interface AMU 2481 PDM 1 PDM 2 Channel 1 Channel 2 Channel 3 Channel 4 S Bus 6 20 19 23 22 8 9 15 17 16 12 24 3 4 5 14 10 11 13 1 21 M a t r i x M i x e r IREF1 VSUP Deemphasis J17 Deemphasis J17 Deemphasis 50 µs Oversampling Channel 3 ΦM sin x x sin x x sin x x sin x x |
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