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CA1216032A
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Variable digital frequency generator with value storage
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Synchronous digital QPSK demodulator with carrier error correction
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Equalization system for modems in a polled arrangement
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Communication system providing simultaneous two-way transmission
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Full duplex communication system for voice grade channels
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Quadrature-amplitude-modulation data transmission systems and transmitters
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QAM phase jitter and frequency offset correction system
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Multi-phase and multi-amplitude level modulator and modulation and demodulation methods
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Phase demodulator with offset frequency reference oscillator
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Carrier recovery scheme for a SSB-SC signal
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Multi-level digital filter
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Phase demodulator with phase shifted reference carrier
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Carrier phase correction circuit for data communications system
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Automatic equalizer with decision directed feedback
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Digital FM (FSK) modulator
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Clock recovery system
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Door control means
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