Can HASA replace the SPL meter??

[saurabh]

Do you have a pocket PC ??? do you have HASA loaded on it ???

If yes, do you think it can replace the SPL meter ??

Some excerpts from the help file

HASA takes samples of the sounds picked up by the built-in microphone on the Pocket PC. It then applies a Fourier Transform to the samples, and obtains their frequency spectrum. In the bottom third of the HASA display you can observe the sound samples as they are picked up by the microphone:

The number of samples is 4096 (indicated by L=4096 in the status line) 
On the Pocket PC 2002 the sampling rate is 22050 samples per second (R=22050 in the status box). On the Pocket PC, the sampling rate is 11000 samples per second. 
The plots shows the value of the ADC output at each of the 4096 samples. The ADC range is -32767 to +32768 (a signed 16-bit integer). The vertical scale is automatically adjusted as HASA runs. The horizontal scale corresponds to time: the length of the plot is simply L/R = 4096/22050 i.e. about a fifth of a second. 
The green dot in the upper right hand corner of the plot will change to red if the input level starts to overload i.e. if any of the ADC values approach +/- 32767. This indicates the onset of "clipping". 
The maximum observed signal level is shown by "M=" in the status line. The value shown is maximum ADC divided by 1000. 
In the upper part of the HASA display is plotted the frequency spectrum of the sounds picked up by the microphone. Because the sample rate is 22kHz (11kHz on the Pocket PC pre-2002) the maximum discernible frequency is 11kHZ (5.5 kHz). So the horizontal scale runs to this maximum frequency value. The vertical scale is the dB level.

Need opinions from the experts, Demo is available for testing.

 

[blowinch]

the ie-33 looks cool. cant see any specs or a price though. the mic would have to be darn good.

 

[HiFi Jake]

How are you going to calibrate the mic on your Pocket PC?

I wouldn't expect that mics and the related cicuitry on all pocket PCs have the same spec.

From the manual:

So if you feed White Noise to an amplifier/loudspeaker, and measure the produced sound using HASA, then you will be measuring the combined frequency response of a) the amplifier, b) the loudspeaker, and c) the built-in microphone in your PocketPC. If the measured spectrum is not flat, then the frequency response of the system is not ideal.

Sounds to me like your results will be affected by the quality of the built in mic.

Also, it's limited to 22 kHz sample rate audio, which means it can't measure anything above 11 kHz.

Probably make a handy guitar tuner though.