When Casio decided to retire the CZ line, they decided to go in two directions : more complex ( the VZ " Interactive " Phase Distortion line ), and more traditional ( SD synthesis, starting with the HZ-600 ).
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Cinavia's in-band signaling introduces intentional spread spectrum phase distortion in the frequency domain of each individual audio channel separately, giving a per-channel digital signal that can yield up to around 0.2 bits per second depending on the discontinuities introduced.
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Other measurements, such as phase distortion and jitter, can also be very important for some applications, some of which ( e . g . wireless data transmission, composite video ) may even " rely " on accurate production of phase-adjusted signals.
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Casio's own later engine named "'Interactive Phase Distortion ( iPD ) "', which featured in their VZ synths ( VZ-1, VZ-10M, and VZ-8M; the first two also rebadged by Hohner as the HS-2 resp.
