AN 407: Automotive Audio Reference Design

AN 407: Automotive Audio Reference Design

22 Pages · 2003 · 2.1 MB · English

The Altera® Automotive Audio Reference Design demonstrates Altera. Cyclone™ Audio input samples stored as .wav files on a compact flash (CF) card. □ . Figure 4 shows the structure of a seven-channel graphic equalizer. The.

AN 407: Automotive Audio Reference Design free download


Altera Corporation 1 AN40710Preliminary Application Note 407 Automotive Audio Reference Design Introduction The Altera ® Automotive Audio Reference Design demonstrates Altera Cyclone ™ FPGAs in an audio processing role targeted at the automotive sector The reference design runs on a Nios ® development board, Cyclone ® edition, or Cyclone II edition, with an eightchannel Santa Cruz audio digitalto analogue converter (DAC) board f For information on the Nios development board, Cyclone edition, refer to the Nios Development Board Reference Manual, Cyclone Edition; For information on the Nios development board, Cyclone II edition, refer to the Nios Development Board Reference Manual, Cyclone II Edition; for information on the Santa Cruz Audio DAC board, contact your Altera representative The reference design has the following features: ■ Audio input samples stored as wav files on a compact flash (CF) card ■ Sevenband graphic equalizer ■ Centre mono, sub mono, front stereo and rear stereo audio outputs (six channels) ■ Delay line (up to 10 ms) for front or rear delay compensation ■ Up to sixband parametric equalizers for each of six output channels ■ Supports standard digital audio sample rates, for example 441 and 48 kHz Functional Description Figure 1 shows the Automotive Audio Reference Design block diagram Audio input sound samples are stored in wav files in a CF card using a FAT32 filing system A 512 MB CF card can hold approximately 30 minutes of uncompressed 24bit stereo audio sampled at 48 kHz Version 10, April 2006 2 Altera Corporation Preliminary Automotive Audio Reference Design Figure 1 Block Diagram Audio output is through an eightchannel Santa Cruz audio DAC board, which incorporates four Texas Instruments TLV320DAC32 stereo audio DACs The outputs of this board drive headphones or powered loudspeakers The user interface comprises a twoline by 16character LCD display and pushbuttons Figure 1 does not show the debounce logic for the pushbutton inputs, PLLs, and reset logic The audio sample rate is set by a PLL, which clocks the TLV320DAC23 audio DACs on the Santa Cruz audio DAC board The audio sample rate ultimately controls the data rate through the whole of the reference design The audio DACs pull data through the system from the CF card at the required rate By default the reference design is configured for playback at 441 kHz Santa Cruz Audio DAC Board Up to eight channels of linelevel analogue audio are available from four TLV320DAC23 stereo audio DACs Each TLV320DAC23 has an InterIC Sound (I 2S) interface for audio samples and a serial peripheral interface (SPI) for control and status In the automotive audio reference design, the sub channel is replicated on both left and right channels of one DAC Similarly, the centre channel is replicated on left and right channels of a second DAC This arrangement allows some simplification of the hardware and software design and easy connection to readily available powered speakers of the type intended for use with PCs Audio Processing Hardware Santa Cruz Audio DAC Speaker Avalon Interface JTAG UART Host Connection LCD & Pushbuttons Nios II Processor SDRAM Flash Compact Flash Altera Corporation 3 Preliminary Functional Description No further processing of the linelevel outputs is required because the antialias filter is internal to the TLV320DAC23 The outputs are AC coupled using a series capacitor A series termination resistor limits the current if the outputs are accidentally short circuited Ta b l e 1 shows the outputs of the Santa Cruz audio DAC board The Santa Cruz audio DAC board must be plugged in to the PROTO2 connectors on the Nios development board and there is a piggyback connector to allow attachment of the LCD display The PROTO1 connector on the Nios development board is shared with the CF interface and is unavailable for use by the audio DAC board or the LCD display Audio Processing Hardware Figure 2 shows the audio processing hardware The Nios II processor reads audio samples from an SDRAM

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