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FAA20 Embedded NEXCOM Vocoder
Board Manual
This manual has been prepared for the Federal Aviation Administration.
FA100-00107 (March 2004) Rev 1.0.0 Page 67
8.3.4 CLKDET
The CLKDET command displays measured sampling, frame, and clock
rates for the audio, PCM, and nibble interfaces, respectively.
Table 15: CLKDET Command Syntax
ATTRIBUTE DESCRIPTION
SYNTAX CLKDET
PARAMETERS None
FLASH NO
EXAMPLES Print measured rates
COM1: clkdet
> CLKDET AUD = 8000.00 symbols/sec sampling rate
> CLKDET PCM = 7999.99 symbols/sec frame rate
> CLKDET NTX = 9600.00 symbols/sec clock rate
> CLKDET NRX = 9599.97 symbols/sec clock rate
The rates are determined by measuring the average time between interrupt
events. Since interrupt latencies affect results, a rate is determined over an
average of at least 100 events. The clock accuracy is estimated to be
within 1 symbol/second under normal/typical processor loading.
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