Microphone system
A system remotely controls a microphone through a remote control unit. The remote control unit includes a frequency modulator that modulates a control signal. A cable conductor that is used to provide phantom power also conveys a frequency-modulated control signal. The frequency-modulated control signal and audio signals may be separated.
1. A method for remotely controlling a plurality of parameters of a microphone system comprising:
providing a DC voltage through at least two cable conductors;
generating different levels of voltages based on the DC voltage from a phantom power supply, the different levels of voltages including a polarization voltage, a supply voltage and an operational voltage;
generating a control signal operable to control the plurality of parameters of the microphone system, where the control signal is frequency-modulated;
regulating the polarization voltage based on a desired value determined in the control signal; and
supplying the control signal to the microphone system through the two cable conductors.
2. The method of claim 1 , further comprising: suppressing the frequency-modulated control signal to the cable conductors as a common mode signal by a differential input amplifier.
3. The method of claim 1 , further comprising:
transmitting an audio signal;
transmitting the frequency-modulated control signal; and
separating the frequency-modulated control signal from the audio signal by a differential input amplifier.
4. The method of claim 1 , further comprising:
transmitting an audio signal;
transmitting the frequency-modulated control signal; and
separating the frequency-modulated control signal from the audio signal by a low-pass filter.
5. The method of claim 1 , further comprising: forwarding a data acknowledge message from the microphone electronics to a remote control unit in response to the control signal.
6. The method of claim 5 , further comprising frequency-modulating the data acknowledge message.
7. The method of claim 1 , further comprising:
generating a control command in response to the control signal; and
providing the control command to microphone electronics.
8. The method of claim 7 , where the supplying the control signal comprises superimposing the control signal on the DC voltage from the phantom power supply during transmissions to the microphone system.
9. A remote control system, comprising:
a microphone system comprising at least two cable conductors connected to a microphone capsule via an audio amplifier;
a remote control unit configured to be in communication with the microphone system, the remote control unit comprising:
a parameter control input that provides an input for controlling a plurality of parameters of the microphone system; and
a frequency modulator coupled to the parameter control input and operable to modulate a control signal; and
a phantom power supply that provides a DC voltage through the two cable conductors to the microphone system wherein the control signal is superimposed on the DC voltage from the phantom power supply.
10. The remote control system of claim 9 , further comprising a mixer connected to the remote control unit, the mixer supplying a power to the remote control unit and the microphone system.
11. The remote control system of claim 9 , where the frequency modulator is operable to provide the modulated control signal to one of the two cable conductors.
12. The remote control system of claim 11 , where the modulated control signal is provided to a conductor that is substantially free of an audio signal.
13. The remote control system of claim 9 , where the remote control unit further comprises a differential input amplifier operable to suppress the modulated control signal.
14. The remote control system of claim 9 , where the remote control unit further comprises a low pass filter operable to suppress the modulated control signal.
15. The remote control system of claim 9 , where the microphone system further comprises a filter operable to separate the modulated control signal from an audio signal.
16. The remote control system of claim 15 , where the microphone system further comprises a controller operable to evaluate control information contained in a separated control signal.
17. The remote control system of claim 16 , where the microphone system further comprises microphone electronics and the controller transmits to the microphone electronics a command based on the control information.
18. The remote control system of claim 9 , where the phantom power supply is integrated with the remote control unit.