Recent content by nauman

Actually, i came across some underwater echo sounder transducers in which multiple piezo electrical transducers were hardwired in the way described above and only single connection was available for both transmission and reception. In case of Transmission, it is obvious that each of these piezo...

But i am talking about transducers in reception mode only in which i think these act as a voltage sources not power source!

Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane...

Hi all I have a underwater hydrophone with known receive sensitivity e.g. -190dB ref 1v/upa with a preamplifier having gain of 40dB at frequency e.g. 200Hz. I measure preamplifier output using spectrum analyzer and it gives PSD of around -80dBvrms/sqrtHz. I need to convert this PSD value into...

I am able to simulate by adding a small resistance in series with source V1 and grounding the source but still output is not correct i.e. 1mVpp across 50 ohm load whereas it should be around 800mVpp!

Thanks very much for help. I think you are right. I have problem in simulating the transformer in Orcad Capture as i am trying to simulate filter circuit connected with Q01 collector standalone and have following errors! "ERROR -- Node N27120 is floating ERROR -- Node N27066 is floating ERROR --...

Hi all I am trying to simulate input stage of a variable gain preamplifier for acoustic hydrophone operating in frequency range of 90KHz to 110KHz. It is transistor based preamplifier. The gain of preamplifier (Q01) is controlled through dc control voltage (Vc) connected with base of Q04...

Yes, i meant Lat/Long data in digital format

Thanks for help. Is there any micro controller/ICs which can do these tasks?

The existing circuitry is designed for audio frequency range only

GPS data needs to be send after every 3 to 4 seconds

Hi all I need to add GPS digital output (in form of Lat/Long) in an existing analog audio signal whose bandwidth is 100 Hz-20 KHz. This GPS data should be added in such a way that it should not interfere with audio signal neither total bandwidth of analog signal should exceed 40 KHz. This...

Yes you are right that noise will have to be catered. However, what about delays which are greater than one cycle length? As I have understood so far, cross correlation techniques can measure only those delays accurately which are less than one cycle length in case of single frequency signals...

Unfortunately no. Still searching for some clue.

These two signals are from two sensors which are some distance apart and the delays estimated using cross correlation will be utilised for bearing estimation. I am stuck here how to proceed? According to literature, bearing estimation using delay measurements is a standard technique being used.