Analog scrambler
An analog signal scrambler/de-scrambler includes a receiver for receiving an analog signal and converting the signal into an intermediate frequency signal. A generator generates a pseudo-random gaussian frequency distribution signal, which is multiplied with the intermediate frequency signal by a frequency converter to scramble/de-scramble the analog signal.
1. An analog signal scrambler, comprising:
a receiver for receiving an analog signal and converting the analog signal into an intermediate frequency signal;
a generator for generating a pseudo-random gaussian frequency distribution signal; and
a frequency converter for multiplying the intermediate frequency signal and the pseudo-random gaussian frequency distribution signal, thereby scrambling the analog signal,
wherein said generator comprises:
a pseudo-random noise generator for generating a pseudo-random noise signal based on a password,
a filter for filtering the pseudo-random noise signal, and
a converter for converting the filtered pseudo-random noise signal into the pseudo-random gaussian frequency distribution signal.
2. The analog signal scrambler according to claim 1 , wherein said receiver is a single side band receiver that converts the analog signal into a single side band intermediate frequency signal.
3. The analog signal scrambler according to claim 1 , wherein said frequency converter multiplies the intermediate frequency signal and the pseudo-random gaussian frequency distribution signal to form a radio frequency signal.
4. An analog signal de-scrambler, comprising:
a receiver for receiving a scrambled analog signal and converting the scrambled analog signal into an intermediate frequency signal;
a generator for generating a pseudo-random gaussian frequency distribution signal; and
a frequency converter for multiplying the intermediate frequency signal and the pseudo-random gaussian frequency distribution signal, thereby de-scrambling the scrambled analog signal,
wherein said generator comprises:
a pseudo-random noise generator for generating a pseudo-random noise signal based on a password used for scrambling the scrambled analog signal,
a filter for filtering the pseudo-random noise signal, and
a converter for converting the filtered pseudo-random noise signal into the pseudo-random gaussian frequency distribution signal.
5. The analog signal de-scrambler according to claim 4 , wherein said receiver is a single side band receiver that converts the scrambled analog signal into a single side band intermediate frequency signal.
6. A secure analog signal transmission system, comprising:
a transmitting unit, which comprises:
a first receiver for receiving an analog signal and converting the analog signal into a first intermediate frequency signal;
a first generator for generating a first pseudo-random gaussian frequency distribution signal, wherein said first generator comprises:
a first pseudo-random noise generator for generating a first pseudo-random noise signal based on a password,
a first filter for filtering the first pseudo-random noise signal, and
a first converter for converting the filtered first pseudo-random noise signal into the first pseudo-random gaussian frequency distribution signal; and
a first frequency converter for multiplying the first intermediate frequency signal and the first pseudo-random gaussian frequency distribution signal, thereby scrambling the analog signal; and
a receiving unit, which comprises:
a second receiver for receiving the scrambled analog signal from said transmitting unit and converting the scrambled analog signal into a second intermediate frequency signal;
a second generator for generating a second pseudo-random gaussian frequency distribution signal; and
a second frequency converter for multiplying the second intermediate frequency signal and the second pseudo-random gaussian frequency distribution signal, thereby de-scrambling the scrambled analog signal,
wherein said second generator comprises:
a second pseudo-random noise generator for generating a second pseudo-random noise signal based on the password,
a second filter for filtering the second pseudo-random noise signal, and
a second converter for converting the filtered second pseudo-random noise signal into the second pseudo-random gaussian frequency distribution signal.
7. The system according to claim 6 , wherein said first receiver is a single side band receiver that converts the analog signal into a first single side band intermediate frequency signal.
8. The system according to claim 6 , wherein said first frequency converter multiplies the first intermediate frequency signal and the first pseudo-random gaussian frequency distribution signal to form a radio frequency signal.
9. The system according to claim 6 , wherein said second receiver is a single side band receiver that converts the scrambled analog signal into a second single side band intermediate frequency signal.
10. The system according to claim 6 , wherein said transmitting unit further comprises a linear amplifier for amplifying the scrambled analog signal for transmission.