Condenser microphone Sound Sensor with LM393 op amp

hi , i brought a sound sensor for recording voice samples

i connected this sensor output to analog pin to arduino mega A5 then i have fallowed the APC digital recording project for recording voice samples

http://apcmag.com/arduino-projects-digital-voice-recorder-part-2.htm/ (3.5 mm jack didnt work for me)

the wav file is having too much noise
how to record filtered proper voice samples ?

I don't know anything about that project, but I know a lot about audio electronics...

the wav file is having too much noise how to record filtered proper voice samples ?

It's best to prevent the noise in the first place. Noise reduction and filtering can sometimes work and it's easier if you have a constant low-level background noise. If the noise is bad, sometimes there's nothing you can do. And you really need a computer, so you'd have to transfer the file to a computer for noise reduction.

Pros still record in soundproof studios with good equipment. On-location movie dialog is re-recorded in the studio. ...Even with pro software there is only so much you can do with a bad recording.

I have some questions, and I'll suggest a couple of troubleshooting experiments you can do -

What's the nature of the noise? ...It's it a low-frequency hum? ...A buzz? ...Hiss?

When do you hear it? ... During silence? ... During quiet parts? ... During loud parts?

The website says:

With only 8-bit sample depth, the signal-to-noise ratio (SNR) is roughly around 40dB (cassette tape), so there’s a bit of background hiss, but if you record audio that has serious dynamic range compression, you don’t notice it (AC/DC’s Back in Black, for example, sounds great).

Back In Black is only going to "sound great" if it's properly normalized. That means the signal level can't be too high (too loud) or the file will be clipped (distorted). If the signal is too low, quantization noise becomes a problem (especially at 8 bits).

If you rip a CD or convert an MP3 to 8-bit WAV, the levels will be correct. But, if you are recording analog it's tougher to get the levels right. And, if you are recording with a microphone, you've got microphone quality, speaker quality, room acoustics, and room noise, all those things degrade sound quality.

Quantization noise is most noticeable during quiet parts. There is no quantization noise with dead-digital silence, and the noise is masked (drowned out) by loud sounds. So, a "constantly loud" song like Back In Black can sound OK, but a classical song with quiet parts and loud parts isn't going to sound good in 8-bits.

i brought a sound sensor for recording voice samples

http://www.amazon.in/LM393-Detection-Sensor-Module-DC4-6V/dp/B00NR3VOJ8?tag=googinhydr18418-21

It says it's a "sound detection sensor". It doesn't actually say it that it puts-out "clean" audio for recording. It also doesn't say if the output is properly biased for the Arduino (which cannot accept the negative half of an AC audio signal).

Do you have a link to the datasheet and/or schematic?

Experiments: If you can read/write the SDcard on your computer, play the file on your computer. If it sounds bad, you have a recording problem. If it sounds OK, you you have a playback problem.

Also, write a known-good WAV file from the computer to the SDcard to check playback quality. If you don't already have an audio editor [u]Audacity[/u] (FREE) can take an existing WAV or MP3 and convert it to an 8-bit mono WAV.

Connect the line-output or (headphone output) from your computer's soundcard to the input of your Arduino recorder (disconnect the microphone board). Check to see if you can get a clean recording when you bypass the microphone board.

If you have a desktop computer with a regular soundcard, plug the microphone board into the line-input and make a recording on the computer. The mic input on a laptop won't work with the amplified output. Of course, you'll have to power the microphone board. If you can get a clean recording on the computer using the microphone board, the microphone board is OK.

That sound module is not appropriate for what your trying to achieve. It is used to detect sound levels and provide a trigger pulse for an MCU. Plenty of youtube.com videos on the LM393.

If an electret microphone alone in the jack doesn't produce a loud enough signal, you might want to look a MAX9812 microphone amplifier module.

oh great response from you guys!

As i said about my project i have fallowed the APC Digital Recording in this project they have used Dynamic Microphone which produces output at 1 VRms

But I will go with Electret or Condenser microphone ( my sound sensor producing 200 milli Volts So not sufficient to feed to controller need to amplify or i will go with MAX9813 )

Coming to noise : i a m getting buzz And great to have thet recording Audicity software thank you