Q:
I would like to know that what would be the amount required for RAM in order to store 4 seconds of stereo sound on a particular sound card with having 44KHz sample rate. It's having 16 bits. Can any body tell me that what would be the rate from the following list.

    * 180 Kbytes
    * 704 Kbytes
    * 440 Kbytes
    * 512 Kbytes

Does any body knows about it? Kindly suggest me your views on the above issue.

Thanks in advance



A:  1. This hardware is generally inexpensive and allows the recording of 16 bit mono/stereo signals with a sampling rate up to 44 kHz. Such high sampling rate is generally is not necessary for speech signals where most applications sampling rate 11 kHz is sufficient.
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    2. The PC is used to convert the VLF signal into an audible signal

    * Soundcard runs at a sample rate of 44100 or 48000 Hz
    * Frequency is converted down to an audio frequency of 650Hz (or similar)
    * 650 Hz "Audio IF" is passed through a narrow-band filter (100Hz BW)
    * The amplified audio is sent to the soundcard's D/A converter.