| 11. | They are encoded separately just like they were in an amplitude-shift keying ( ASK ) modulator.
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| 12. | The tone is modulated using frequency shift keying.
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| 13. | Routines in the ROM were used to encode and decode data in frequency-shift keying for the cassette.
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| 14. | A frequency shift keying ( FSK ) signal is alternating between two waveforms, and allows passband transmission.
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| 15. | The uplink uses frequency-shift keying with 3.951 MHz for a logical'0'and 4.516 MHz for a logical'1 '.
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| 16. | Two bits of information is encoded into each state using a method known as quadrature phase-shift keying.
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| 17. | BPSK modulation has been replaced with newer modulation schemes such as QPSK ( quadrature phase-shift keying ).
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| 18. | It used Frequency Shift Keying ( FSK ) to send data, shifting between 20 kHz and 26 kHz.
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| 19. | When differential encoding is used in this manner, the scheme is known as differential phase-shift keying ( DPSK ).
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| 20. | The 145.947 MHz downlink, which uses binary phase-shift keying, also provides a datarate of 1, 200 bits per second.
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