Embedding Audio into your RX Application

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Renesas Electronics America Inc.

Embedding Audio into your RX Application

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Renesas Technology & Solution Portfolio

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Microcontroller and Microprocessor Line-up

Wide Format LCDs   Industrial & Automotive, 130nm 350µA/MHz, 1µA standby

44 DMIPS, True Low Power Embedded Security, ASSP

25 DMIPS, Low Power

10 DMIPS, Capacitive Touch

 Industrial & Automotive, 150nm

 190µA/MHz, 0.3µA standby

 Industrial, 90nm

 Automotive & Industrial, 90nm

 600µA/MHz, 1.5µA standby  Automotive, 40nm

 500µA/MHz, 35µA deep standby

 1mA/MHz, 100µA standby

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25 DMIPS, Low Power

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Wide Format LCDs   Industrial & Automotive, 130nm 350µA/MHz, 1µA standby

25 DMIPS, Low Power

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‘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”

“This class will show you how simple it can be to add various levels of audio to your next project”

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Agenda

 DAC

 PWM

 Lab

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Audio Experience

 BMW pursuing better acoustics to improve efficiency

servo motors used to raise the windows and adjust the

seats, then compare them with sounds made by a BMW and other competitor

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Audio Considerations

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Telephone or Voice quality

Spectrum of Audio Clip

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Bandwidth, Storage and Dynamic Range

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Dynamic Range – How many bits?

48 dB = 8 bit

60 dB = 10 bit

96 dB = 16 bit

144 dB = 24 bit

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Improving Dynamic Range

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Signal Compression - ADPCM

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Audio Data Compression

Format (compression type) Bitrate (Kbps) Filesize (KB/min)

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Hardware requirements

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DAC or PWM Output

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Filter Considerations

filter design

the unwanted higher frequencies

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PWM vs DAC Resolution

so all 1024 states of 10 bit DAC available

“skipped” while still using PWM carrier

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DAC Output Resistance

DAC

Vload

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DAC Filter

Frequency / Hertz500m 1 2 5 10 20 50 100 200 500 1k 2k 5k 10k 20k 50k 100k

10m20m50m100m200m500m1

2.5 kHz First Order Filter

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RX Audio Demo

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Renesas RX63N RDK

J-Link debugger

Speaker Stereo headphone

jack

SD-Card

Graphics LCD User push

buttons

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RX Audio Demo

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RX Audio Demo - supported formats

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RX Audio Demo

Decode path block diagram

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RX Audio Demo

MCU peripherals used

 Two synchronizable "TPU" timer channels for PWM audio rendering

 Data Transfer Controller (DTC) for streaming PWM timer data to the TPU timers.

 RSPI channel for SDCard communication

 12-bit ADC to measure the 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

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Lab Time !

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Summary

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Questions?

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‘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 one of the most effective ways of improving information delivery”

“This class will show you how simple it can be to add various levels of audio to your next project”

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Renesas Electronics America Inc.

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