Cognitive modulators
View Patent ↗A modulator includes input paths for audio information from an electronic audio channel; output paths for transmitting said audio information over a frequency-modulated radio frequency signal to a FM broadcast receiver; and one or more programs for measuring or estimating the spectrum environment of the frequency-modulated RF signal bearing the audio information through sampling and analysis to select an optimum radio signal level and signal transmission mode for transmission to the FM receiver in a near interference free manner.
1. A modulator comprising input paths for audio information from an electronic audio channel; output paths for transmitting said audio information over a frequency-modulated radio frequency signal to an FM broadcast receiver; means for measuring or estimating the local RF reception environment of the frequency-modulated RF signal bearing the said audio information through sampling and analysis to select an appropriate radio signal level for near interference free transmission to said FM receiver; and means for measuring the interference and noise, at and near a transmission frequency channel, without turning off FM modulator output power, and adjusting carrier output power, without turning off FM modulator output power, to provide a target FM broadcast receiver with audio having a desired signal-to-noise ratio.
2. The modulator of claim 1 , wherein said electronic audio channel comprises an analog or digital signal of voice, music, data and combinations thereof, including FM mono and stereo, cellular telephone, mapping data and RBDS/RDS.
3. The modulator of claim 1 , wherein said electronic audio channel comprises FM mono and stereo, or cellular telephone, or mapping/navigation data or RBDS/RDS.
4. The modulator of claim 1 , further comprising means for varying modulator transmitter power, for adjusting transmission mode parameters, or both, to overcome interference from co-channel users, adjacent channel users and ambient noise at the transmitter radio frequency.
5. The modulator of claim 1 , further comprising means for minimizing its potential interference back into co-channel users' receivers, adjacent channel users' receivers, or both.
6. The modulator of claim 1 , further comprising means for detecting/measuring interference and noise energy in the spectral vicinity of the frequency-modulated RF signal bearing the audio information, and for adjusting transmission parameters to compensate, proportionally or otherwise, for the interference and noise levels in said spectral vicinity, or means for estimating interference and noise energy in said modulator's spectral bandwidth of operation, and using these estimates to set optimally the modulator's transmission power level, stereo/mono transmission mode, or both.
7. The modulator of claim 1 , further comprising means for collecting a plurality of power spectral density measurements over defined time periods at more than one spectral location at or near said modulator's transmission frequency, for weighting each measurement sample, and for using the weighted measurements (concurrently or averaged over a defined time period) to calculate estimates for adjusting said modulator's transmission power and transmission mode.
8. The modulator of claim 1 , further comprising means for reducing deviation of said modulator while making said measurements, or means for sampling sub-adjacent frequencies during periods of low audio modulation, or means for changing the audio modulation signal from FM multiplex stereo to FM mono during sub-adjacent channel sampling.
9. A system comprising: a switchable stereo/mono FM modulator with programmable RF output power level, a frequency-agile FM sampling receiver capable of measuring and reporting received signal power, a processing device that runs programs/algorithms to control the FM modulator and FM sampling receiver, and that collects and processes measurement data from said sampling receiver; and means for measuring the interference and noise, at and near a transmission frequency channel, without turning off FM modulator output power, and adjusting carrier output power, without turning off FM modulator output power, to provide a target FM broadcast receiver with audio having a desired signal-to-noise ratio.
10. The system of claim 9 , wherein said modulator comprises input paths for audio information from an electronic audio channel; output paths for transmitting said audio information over a frequency-modulated radio frequency signal to a FM broadcast receiver; and means for measuring or estimating the reception environment of the frequency-modulated RF signal bearing the said audio information through sampling and analysis to select an appropriate radio signal level for near interference free transmission to said FM receiver.
11. The system of claim 10 further comprising means for detecting/measuring interference and ambient noise energy in the spectral vicinity of the frequency-modulated RF signal bearing the audio information, and for adjusting transmission parameters to compensate, proportionally or otherwise, for the interference and noise levels in said spectral vicinity, or means for estimating interference and noise energy in said modulator's spectral bandwidth of operation, and using these estimates to set the modulator's transmission power level, stereo/mono transmission mode, or both for near interference free reception by a local FM broadcast receiver.