Privacy communication device

A privacy communication device, comprising:

• a modulator for modulating a voice signal by using a carrier before transmission by radio;
• a demodulator for demodulating a voice signal by using a carrier after reception by radio;
• carrier generating means for producing carrier of a specific frequency specified in accordance with a control signal out of a plurality of frequencies prepared in advance and applying it to said modulator and said demodulator;
• and
• control signal transmitting and receiving means for transmitting and receiving said control signal by radio through a channel different from a voice channel, wherein said carrier generating means gives carriers of different frequencies to said modulator and said demodulator.

A privacy communication device, comprising:

• a modulator for modulating a voice signal by using a carrier before transmission by radio;
• a demodulator for demodulating a voice signal by using a carrier after reception by radio;
• carrier generating means for producing carrier of a specific frequency specified in accordance with a control signal out of a plurality of frequencies prepared in advance and applying it to said modulator and said demodulator;
• and
• control signal transmitting and receiving means for transmitting and receiving said control signal by radio through a channel different from a voice channel, wherein said carrier generating means consists of modulator carrier generating means for giving a carrier to said modulator and a demodulator carrier generating means for giving a carrier to said demodulator and wherein said modulator carrier generating means and said demodulator carrier generating means generate carrier with different frequencies.

A privacy communication device, comprising:

• a modulator for modulating a voice signal by using a carrier before transmission by radio;
• a demodulator for demodulating a voice signal by using a carrier after reception by radio;
• carrier generating means for producing carrier of a specific frequency specified in accordance with a control signal out of a plurality of frequencies prepared in advance and applying it to said modulator and said demodulator;
• and
• control signal transmitting and receiving means for transmitting and receiving said control signal by radio through a channel different from a voice channel, wherein said control signal transmitting and receiving means transmits and receives said control signal at indeterminate intervals.