Renesas Electronics America Inc. © 2012 Renesas Electronics America Inc. All rights reserved. Embedding Audio into your RX Application © 2012 Renesas Electronics America Inc. All rights reserved.2 Renesas Technology & Solution Portfolio © 2012 Renesas Electronics America Inc. All rights reserved.3 Microcontroller and Microprocessor Line-up Wide Format LCDs  Industrial & Automotive, 130nm  350µA/MHz, 1µA standby 44 DMIPS, True Low Power Embedded Security, ASSP 165 DMIPS, FPU, DSC 1200 DMIPS, Performance 1200 DMIPS, Superscalar 500 DMIPS, Low Power 165 DMIPS, FPU, DSC 25 DMIPS, Low Power 10 DMIPS, Capacitive Touch  Industrial & Automotive, 150nm  190µA/MHz, 0.3µA standby  Industrial, 90nm  242µA/MHz, 0.2µA standby  Automotive & Industrial, 90nm  600µA/MHz, 1.5µA standby  Automotive & Industrial, 65nm  600µA/MHz, 1.5µA standby  Automotive, 40nm  500µA/MHz, 35µA deep standby  Industrial, 40nm  242µA/MHz, 0.2µA standby  Industrial, 90nm  1mA/MHz, 100µA standby  Industrial & Automotive, 130nm  144µA/MHz, 0.2µA standby 2010 2013 32-bit8/16-bit © 2012 Renesas Electronics America Inc. All rights reserved.4 Microcontroller and Microprocessor Line-up Wide Format LCDs  Industrial & Automotive, 130nm  350µA/MHz, 1µA standby 44 DMIPS, True Low Power Embedded Security, ASSP 165 DMIPS, FPU, DSC 1200 DMIPS, Performance 1200 DMIPS, Superscalar 500 DMIPS, Low Power 165 DMIPS, FPU, DSC 25 DMIPS, Low Power 10 DMIPS, Capacitive Touch  Industrial & Automotive, 150nm  190µA/MHz, 0.3µA standby  Industrial, 90nm  242µA/MHz, 0.2µA standby  Automotive & Industrial, 90nm  600µA/MHz, 1.5µA standby  Automotive & Industrial, 65nm  600µA/MHz, 1.5µA standby  Automotive, 40nm  500µA/MHz, 35µA deep standby  Industrial, 40nm  242µA/MHz, 0.2µA standby  Industrial, 90nm  1mA/MHz, 100µA standby  Industrial & Automotive, 130nm  144µA/MHz, 0.2µA standby 2010 2013 32-bit8/16-bit © 2012 Renesas Electronics America Inc. All rights reserved.5 Microcontroller and Microprocessor Line-up Wide Format LCDs  Industrial & Automotive, 130nm  350µA/MHz, 1µA standby 44 DMIPS, True Low Power Embedded Security, ASSP 165 DMIPS, FPU, DSC 1200 DMIPS, Performance 1200 DMIPS, Superscalar 500 DMIPS, Low Power 165 DMIPS, FPU, DSC 25 DMIPS, Low Power 10 DMIPS, Capacitive Touch  Industrial & Automotive, 150nm  190µA/MHz, 0.3µA standby  Industrial, 90nm  242µA/MHz, 0.2µA standby  Automotive & Industrial, 90nm  600µA/MHz, 1.5µA standby  Automotive & Industrial, 65nm  600µA/MHz, 1.5µA standby  Automotive, 40nm  500µA/MHz, 35µA deep standby  Industrial, 40nm  242µA/MHz, 0.2µA standby  Industrial, 90nm  1mA/MHz, 100µA standby  Industrial & Automotive, 130nm  144µA/MHz, 0.2µA standby 2010 2013 32-bit8/16-bit 32-Bit High Performance DSP, FPU with High Integration © 2012 Renesas Electronics America Inc. All rights reserved.6 ‘Enabling The Smart Society’  Challenge: “Improving the interface to the new smart machines is one of the important concepts of the Smart Society. Audio is an effective way of improving information delivery”  Solution: “This class will show you how simple it can be to add various levels of audio to your next project” © 2012 Renesas Electronics America Inc. All rights reserved.7 Agenda  Discuss audio formats and requirements  Embedded applications not high quality music players  Hardware Requirements  DAC  PWM  RX Audio Demo Components  Basic decoding scheme  Peripheral Blocks  Lab  Summary © 2012 Renesas Electronics America Inc. All rights reserved.8 Audio Experience  BMW pursuing better acoustics to improve efficiency  Audio used to compensate for low RPM rumble  - At Mercedes-Benz engineers record the sounds of those servo motors used to raise the windows and adjust the seats, then compare them with sounds made by a BMW and other competitor  if it sounds well made, it probably is  Do Your Products Sound Priceless? © 2012 Renesas Electronics America Inc. All rights reserved.9 Audio Considerations © 2012 Renesas Electronics America Inc. All rights reserved.10 Key Considerations  What type of audio is needed  Simple tones  Speech  Music  What are characteristics and requirements  File size – Internal Flash – External file storage – File system  MCU and Bus Bandwidth  Transducer (speaker)  Amplifier/filter requirements [...]... Electronics America Inc All rights reserved 2 3 4 5 1mSecs/div RX Audio Demo 25 © 2012 Renesas Electronics America Inc All rights reserved Renesas RX6 3N RDK Graphics LCD J-Link debugger User push buttons Speaker Stereo headphone jack SD-Card MIC and amplifier 26 POT VR1 © 2012 Renesas Electronics America Inc All rights reserved LED Ring RX Audio Demo  SD-Card stack & low-level drivers  FAT file system... browser  Supports  MP3  WAV  ADPCM  Stereo PWM output  Software volume control  YRDK RX6 3N 27 © 2012 Renesas Electronics America Inc All rights reserved © 2012 Renesas Electronics America Inc All rights reserved RX Audio Demo - supported formats  MP3  MPEG-1 /Audio( ISO/IEC11172-3)LayerIII  MPEG-2 /Audio( ISO/IEC 13818-3)LayerIII  MPEG-2.5 (For Low Sampling Frequencies)  ADPCM  WAV (uncompressed... All Inc All rights reserved © 2012 Renesas Electronics America rights reserved RX Audio Demo Decode path block diagram SDCard Raw binary 29 RSPI MMC Blocks © 2012 Renesas Electronics America Inc All rights reserved © 2012 Renesas Electronics America Inc All rights reserved FAT File I/O MP3 MP3 decode Render Timers RX Audio Demo Rendering block diagram Render Load next PCM sample Reload Ping DTC L... TPU1.TGRB clears all channels at the audio sample rate Timer count value TPU1.TGRB Sets Playback Rate TPU0.TGRA TPU0.TGRB Elapsed time Channel A PWM Channel B PWM 31 © 2012 Renesas Electronics America Inc All Inc All rights reserved © 2012 Renesas Electronics America rights reserved RX Audio Demo MCU peripherals used  Two synchronizable "TPU" timer channels for PWM audio rendering  Data Transfer Controller... All rights reserved Signal Compression - ADPCM  PCM stores digitized audio - WAVE is a PCM file  DPCM (Differentia) stores the difference from predicted last sample  ADPCM – Adaptive – adapts step size for better compression (4:1} 16 © 2012 Renesas Electronics America Inc All rights reserved Audio Data Compression  Comparison Audio Files Format (compression type) Uncompressed WAV MP3 MP3 (VBR)... sampling rate/2  May cause amplitude distortion  Buffer and filter can be combined  Output resistance of the DAC should be considered in the filter design  Simple RC acceptable in many applications  Some systems like audio the speaker or listener filters many of the unwanted higher frequencies 20 © 2012 Renesas Electronics America Inc All rights reserved PWM vs DAC Resolution  At 10 kHz DAC settling... be a problem so all 1024 states of 10 bit DAC available  Using 16 bit MTU timer  48 Mhz / 44.1 kHz = 1088  Can utilize more that 10 bits (1024)  Increased resolution just adds audio dynamic range  If a lower resolution audio is used interrupts can be “skipped” while still using PWM carrier 21 © 2012 Renesas Electronics America Inc All rights reserved © 2010 Renesas Electronics America Inc All rights... potentiometer setting for audio playback volume  1 Compare Match Timer (CMT) channel for timed delays in SDCard driver code  Real-time clock (RTC) used for file time stamp 32 © 2012 Renesas Electronics America Inc All Inc All rights reserved © 2012 Renesas Electronics America rights reserved Lab Time ! 33 © 2012 Renesas Electronics America Inc All rights reserved Summary  Audio formats and requirements... PWM  Audio  Various quality levels depending on need  Trade-off – File storage size – Decode bandwidth – Quality 34 © 2012 Renesas Electronics America Inc All rights reserved Questions? 35 © 2012 Renesas Electronics America Inc All rights reserved ‘Enabling The Smart Society’  Challenge: “Improving the interface to the new smart machines is one of the important concepts of the Smart Society Audio. .. important concepts of the Smart Society Audio is one of the most effective ways of improving information delivery”  Solution: “This class will show you how simple it can be to add various levels of audio to your next project” 36 © 2012 Renesas Electronics America Inc All rights reserved  . Electronics America Inc. © 2012 Renesas Electronics America Inc. All rights reserved. Embedding Audio into your RX Application © 2012 Renesas Electronics America Inc. All rights reserved.2 Renesas. rights reserved.7 Agenda  Discuss audio formats and requirements  Embedded applications not high quality music players  Hardware Requirements  DAC  PWM  RX Audio Demo Components  Basic decoding. the Smart Society. Audio is an effective way of improving information delivery”  Solution: “This class will show you how simple it can be to add various levels of audio to your next project” ©