Re: Need good quality Audio output through LPC21xx controller
- From: Vladimir Vassilevsky <antispam_bogus@xxxxxxxxxxx>
- Date: Tue, 30 Sep 2008 08:56:23 -0500
angaddhot@xxxxxxxxx wrote:
We are working on a project based on Vehicle tracking system.In one of
our module we are using audio(voice) for Public transport system.As
if for now we are using filters and a power amplifer We are not able
to get good quality audio output with this setup.
Item used:
Lpc2132 with MMC card interface ,High pass filter+ Low pass filter+
Audio Amplifier+ Speaker
Requirement:
Good Voice quality annoucement system for Public transport System
With PWM at 32kHz carrier and 8bit quantization, you can get a "telephone line" quality speech. It would be even better if you apply the preemphasis and the noise shaping to the recorded signal. You can gain somewhat more quality if you combine several PWM channels. However if you need the "music" quality audio, you should use an external DAC.
Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com
.
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