Wireless FM microphone real time voice/play transmitter Answered
I am looking to buy/build a small FM wireless transmitter with built in microphone (similar to karaoke but not exactly ) to transfer voice or sound from playing musical instrument to earphone.
It is meant only for practice purpose so does not need high power, the distance between the microphone (the transmitter ) to earphone is like from mouth to ear a few centimeters say about 50 cm.
I am electronic junior engineer and have knowledge and experience in electronics mechanics and wave buy. Before trying to develop a new product I was looking for a readymade shelf product.
The first way I have searched the internet and reached manufacturer of Bluetooth solutions because of the plenty of Bluetooth earphone that are on the market, but quit a short time after I got some answers from the the Techs engineers of the manufacturers that Bluetooth will not be my solution because It was not originally designed for true real time transmitting. The main problem is the latency time because there is a delay between the voice or play start until I hear it in the earphone there is improved in Bluetooth 4.1 and 4.2 that is 38 MS and may be not enough while fast playing,
So as I was advised I started looking in the RF FM area.
FM transmitters are long time in the market of stages and performers, there are high power grate quality transmitters that cost hundreds of dollars.
Here is the summary of what I need :
I will need the smallest device (PCB) can be like FM spy bug transmitter.
built in microphone (on the PCB ) , built in battery compartment (on the PCB ),built in antenna a copper loop on the PCB (no wire)
Since there may be some problems like saturation of microphone or other problems with band width or sound and sensitivity, sensitivity and control for the Microphone is important.
Easy calibration of tuning and stability , may be digital tuning is better.
One option is to use the standard of radio FM 88-108 , but it possible that I can use FM VHF or UHF system that have both transmitter and receiver .
If there are no ready made products thatn I can easy build a kit , or from schematic diagrams
I will be thank full if you have any ideas.
Nevat Ben Haim Recomp Computers