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

------------- Read More -------------

Download an-407-automotive-audio-reference-design.pdf

AN 407: Automotive Audio Reference Design related documents

Alternative Splicing Regulation of Cancer-Related Pathways in Caenorhabditis elegans: An In Vivo ...

11 Pages · 2015 · 1.36 MB · English

2 Department of Molecular, Cell and Developmental Biology, The Center for .. elt-6 mpk-1/sur-1. √ eor-1 par-1. √ eor-2. √ ptp-2 gap-1 rom-1 gap-2. √ sem-4 .. [61] M. W. Pastok, M. C. Prescott, C. Dart et al., “Structural diversity.

An interview with Nick Blazquez, President, Africa, Diageo

6 Pages · 2012 · 942 KB · English

23 Diageo, the international drinks company, first shipped Guinness to Sierra Leone in 1827. It built its first brewery outside the British Isles in Nigeria in 1963.

RD Design & Advertising City Of Carson Restaurant Guide FNL

2 Pages · 2009 · 588 KB · English

RD Design & Advertising City Of Carson Restaurant Guide FNL AMERICAN BAKERY ASIAN BBQ BBQ / SOUL FOOD BURGERS / GRILLS ASIAN FAST FOOD FILIPINO ITALIAN / PIZZA

An Economic Analysis of Sex Discrimination Laws

27 Pages · 2015 · 1.64 MB · English

flicts of interest between different groups of women (for example, nonworking nally, Executive Order No 11246, as amended in 1967,10 forbids include sexual harassment.13 Although Title VII has been held not to require .. chance with an unknown quantity by accepting a lower wage. How-.

An overview of auditory display to assist comprehension

16 Pages · 2006 · 143 KB · English

Chemistry students and researchers have difficulty in learning and understanding Typically, small organic molecules, such as amino acids, have a size in In the past few years, the analysis and study of molecular properties have been . the absence of sound represented a broken machine.

An Energy Management Institute Training Program

6 Pages · 2013 · 473 KB · English

An Energy Management Institute Training Program Energy Trading Fundamentals May 15-16, 2013 -- Sheraton Lincoln Harbor -- Weehawken, NJ Taught by leading energy

AN INDEPENDENT SUPPLEMENT BY MEDIAPLANET TO USA TODAY EDITORIAL

10 Pages · 2013 · 4.29 MB · English

an ugly by-product CALIFORNIA FIT ZONES The root cause of this tragedy is a national the Centers for Disease Control and Prevention, has taught us a lot.

Champs-Multizone and Virtual Building for Integrated Building Systems Design and Performance ...

251 Pages · 2015 · 10.72 MB · English

building performance, be skillful of modeling in various simulation environment, and be good at developing models in computer languages.

Building an Intelligent Camera Management System

11 Pages · 2004 · 549 KB · English

Building an Intelligent Camera Management System Yong Rui, Liwei He, Anoop Gupta and Qiong Liu 1 Collaboration and Multimedia Systems Group, Microsoft Research

Top 5 Questions to ask in an Interview 10.7.09

1 Pages · 2009 · 109 KB · English

FIND EMPLOYMENT | www.westvalley.com Life is too Short for the wrong job. Sunnyvale: 408.735.1420 | Pleasanton: 925.416.9707 | www.westvalley.com