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EP0197541A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

System for controlling operation mode of modulator/demodulator

Assignee: NEC Corp
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Filing: 1986-04-08
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Granted: —
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Expires: 2006-04-08
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Abstract

Abstract A modulator/demodulator operation mode control system (40) specifies an operation mode, which is a combination of particular data transmission rate, multi-phase PSK modulation system, error-correction coding rate and others, in which a modulator/demodulator is to operate, while deciding the operation mode and controlling the modulator demodulator. A transmit station designates a particular operation mode in a plurality of bits in terms of polarities of unique words, while a receive station switches a demodulator (42) thereof to the designated operation mode responsive to an output of mode switchover signal decision means (50) and based on signal representative of detection of the unique words.

Inventors

  • 👤 Osamu C/O Nec Corporation Ichiyoshi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 23:07
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/14; H04L5/1438; H04L27/00; H04L27/18; H04L27/22

Claims Analysis

Total Claims: 2
Claim 1
Independent Claim 127 words
A system for controlling operation mode of a modulator/demodulator which switches over operation mode of the modulator/demodulator responsive to a particular combination of modulation system, error-correction coding system and data transmission rate, in which, when the operation mode is switched from one to another, a transmit station generates a plurality (K) of unique words after a unique word for synchronization, which is transmitted for each frame, and then modulates polarities of the K unique words to transmit K-bits binary data to thereby designate a modulation mode.which is to hold next, while a receive station discriminates a switchover when more than a predetermined number of the unique words have been received within a predetermined period of time and identifies the modulation mode based on the K-bits binary data.
Claim 2
Independent Claim 127 words
A system for controlling operation mode of a modulator/demodulator which switches over operation mode of the modulator/demodulator responsive to a particular combination of modulation system, error-correction coding system and data transmission rate, in which, when the operation mode is switched from one to another, a transmit station generates a plurality (K) of unique words after a unique word for synchronization, which is transmitted for each frame, and then modulates polarities of the K unique words to transmit K-bits binary data to thereby designate a modulation mode.which is to hold next, while a receive station discriminates a switchover when more than a predetermined number of the unique words have been received within a predetermined period of time and identifies the modulation mode based on the K-bits binary data.

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