Wireless microphone system
First Claim
1. A wireless microphone system having a wireless microphone for transmitting therefrom electric wave containing audio, tone and noise signals;
- and a receiver unit, wherein said receiver unit includinga) a receiver device having an antenna through which the electric wave is received, the electric wave being demodulated therein to be outputted therefrom;
b) a detector circuit connected with said receiver device so as to detect a signal level of said demodulated electric wave to be outputted therefrom;
c) an audio signal detection circuit connected with said detector circuit through a filter so as to detect said audio signal from the demodulated electric wave;
d) a tone signal detection circuit connected with said detector circuit through a filter so as to detect said tone signal from the demodulated electric wave;
e) a noise signal detection circuit connected with said detector circuit through a filter so as to detect said noise signal from the demodulated electric wave;
f) a plurality of A/D converters each connected with said signal level detection circuit, tone signal detection circuit, and noise signal detection circuit so as to convert said signal level, tone signal, and noise signal from analog signals to digital signals, one of the digital signals being a parameter signal for determining received state of said electric wave;
g) a mute circuit connected with said audio signal detection circuit so as to turn down volume of said audio signal in accordance with said parameter signal;
h) an input device for inputting threshold that is set in accordance with said parameter signal from said electric wave in normal state; and
, i) a controller for switching on or off said mute circuit by the method of detecting a first period of time which is previously set in accordance with said input threshold, detecting a second period of time during which period the said electric wave to be received reaches said input threshold, and outputting a mute-controlling signal at Hi or Lo to said mute circuit in accordance with difference between said first period of time and said second period of time.
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Accused Products
Abstract
There is provided an improved receiver unit for wireless microphone system. The receiver unit accomplishes desirable mute control in accordance with state transmitting conditions of electric wave from a wireless microphone. The receiver unit includes a receiver device 12 for receiving electric wave, a detector circuit 13, and tone and noise signals detection circuits 16, 15 for detecting a signal level (field intensity), and tone and noise signals of the electric wave, respectively, each of the signal level and the signals being used as parameter signals for detecting received state of the electric wave, a mute circuit which is controlled in accordance with the detected, received state of the electric wave that is detected from one of the parameter signals, A/D converters 191 to 193 for converting the parameter signals from analog signal into digital signal, respectively, and a controller 20 having a threshold to be set with respect to the parameter signal, the controller switching on/off the mute circuit in accordance with difference between the parameter signal and threshold. The controller 20 has a first period of time that is previously set in accordance with threshold, as timing in switching off said mute circuit and a second period of time during which period the parameter signal of the received electric wave reaches the threshold. The mute circuit 17 is switched off or on at variable interval in accordance with the difference between the first period of time and second period of time.
43 Citations
18 Claims
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1. A wireless microphone system having a wireless microphone for transmitting therefrom electric wave containing audio, tone and noise signals;
- and a receiver unit, wherein said receiver unit including
a) a receiver device having an antenna through which the electric wave is received, the electric wave being demodulated therein to be outputted therefrom;
b) a detector circuit connected with said receiver device so as to detect a signal level of said demodulated electric wave to be outputted therefrom;
c) an audio signal detection circuit connected with said detector circuit through a filter so as to detect said audio signal from the demodulated electric wave;
d) a tone signal detection circuit connected with said detector circuit through a filter so as to detect said tone signal from the demodulated electric wave;
e) a noise signal detection circuit connected with said detector circuit through a filter so as to detect said noise signal from the demodulated electric wave;
f) a plurality of A/D converters each connected with said signal level detection circuit, tone signal detection circuit, and noise signal detection circuit so as to convert said signal level, tone signal, and noise signal from analog signals to digital signals, one of the digital signals being a parameter signal for determining received state of said electric wave;
g) a mute circuit connected with said audio signal detection circuit so as to turn down volume of said audio signal in accordance with said parameter signal;
h) an input device for inputting threshold that is set in accordance with said parameter signal from said electric wave in normal state; and
,i) a controller for switching on or off said mute circuit by the method of detecting a first period of time which is previously set in accordance with said input threshold, detecting a second period of time during which period the said electric wave to be received reaches said input threshold, and outputting a mute-controlling signal at Hi or Lo to said mute circuit in accordance with difference between said first period of time and said second period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- and a receiver unit, wherein said receiver unit including
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10. A wireless microphone system having a wireless microphone for transmitting therefrom electric wave containing audio, tone and noise signals;
- and a receiver unit, wherein said receiver unit including
a) a receiver device having an antenna through which the electric wave is received, the electric wave being demodulated therein to be outputted therefrom;
b) a detector circuit connected with said receiver device so as to detect a signal level of said demodulated electric wave to be outputted therefrom;
c) an audio signal detection circuit connected with said detector circuit through a filter so as to detect said audio signal from the demodulated electric wave;
d) a tone signal detection circuit connected with said detector circuit through a filter so as to detect said tone signal from the demodulated electric wave;
e) a noise signal detection circuit connected with said detector circuit through a filter so as to detect said noise signal from the demodulated electric wave;
f) a single of A/D converter connected with said signal level detection circuit, tone signal detection circuit, and noise signal detection circuit so as to alternatively convert in series said signal level, tone signal, and noise signal from analog signals to digital signals, one of the digital signals being a parameter signal for determining received state of said electric wave;
g) a mute circuit connected with said audio signal detection circuit so as to turn down volume of said audio signal in accordance with said parameter signal;
h) an input device for inputting threshold that is set in accordance with said parameter signal from said electric wave in normal state; and
,i) a controller for switching on or off said mute circuit by the method of detecting a first period of time which is previously set in accordance with said input threshold, detecting a second period of time during which period the said electric wave to be received reaches said input threshold, and outputting a mute-controlling signal at Hi or Lo to said mute circuit in accordance with difference between said first period of time and said second period of time. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- and a receiver unit, wherein said receiver unit including
Specification