Multiplexed signal transmission system

A multiplexed signal receiving system comprising:

• means for receiving a multiplexed signal transmitted from a transmission section, the multiplexed signal including a four-level signal, the four-level signal including an edge pulse train and serial data associated with edge pulses in the edge pulse train, the serial data including edge attribute information and mode information that controls system status;
• means for demodulating the four-level signal from the received multiplexed signal by frequency modulation;
• means for decoding the serial data and the edge pulse train from the four-level signal;
• means for reproducing the edge attribute information and mode information using the serial data;
• and
• means for reproducing square pulses and constructing a first group of the square pulses using the edge attribute information.

A multiplexed signal transmission system comprising:

• means for receiving a first group of square pulses having a fixed phase relation to each other, the first group of square pulses including a first edge and a second edge following the first edge;
• means for generating an edge pulse train containing in sequence all edges extracted from the first group of square pulses;
• means for generating edge attribute information representing an attribute of the second edge following the first edge;
• means for converting a plurality of parallel data including the edge attribute information and mode information for switching head systems of a multi-head system into serial data;
• means for aligning the serial data in the edge pulse train such that the serial data is located after the edge pulses corresponding to the serial data;
• means for generating a four-level signal having a reference signal level, a first level associated with a clock level for the serial data, a second level associated with the serial data superposed on the clock level and a third level associated with the edge pulses;
• and
• means for generating a transmission multiplexed signal by frequency modulating the four-level signal.

A multiplexed signal receiving system comprising:

• means for receiving a multiplexed signal transmitted from a transmission section, the multiplexed signal including a four-level signal, the four-level signal including an edge pulse train and serial data associated with edge pulses in the edge pulse train, the serial data including edge attribute information and mode information that includes head system switching information;
• means for demodulating the four-level signal from the received multiplexed signal by frequency modulation;
• means for decoding the serial data and the edge pulse train from the four-level signal;
• means for reproducing the edge attribute information and mode information using the serial data;
• means for reproducing square pulses and constructing a first group of the square pulses using the edge attribute information;
• means for detecting at least one square pulse edge out of the first group of square pulses;
• and
• means for reading head system switching information contained in the mode information during a multi-head system overlap period.

A multiplexed signal transmission system comprising:

• means for receiving a first square pulse train in which each square pulse is aligned at a fixed phase relation to each other;
• means for generating edge attribute information indicative of a relationship between edges of square pulses in the first square pulse train and a timing of a square pulse;
• means for converting a plurality of parallel data including control information and mode information into a serial data;
• means for aligning the serial data between edges of the square pulses in the first square pulse train;
• means for generating a signal having a reference level, a first level serving as a clock level for the serial data, and a second level corresponding to the serial data superposed on the clock level;
• and
• means for generating a transmission multiplexed signal by frequency modulating the signal.

A signal transmission system, comprising:

• a stationary section producing a control signal;
• a rotary section including a plurality of rotary heads for recording or reproducing information signals on or from a record medium and circuit members for supplying the rotary heads with the information signals or amplifying the information signals reproduced from the rotary heads;
• means provided on the stationary section for converting the control signal to a serial signal;
• means for modulating the serial signal;
• means for transmitting the modulated serial signal to the rotary section;
• means provided on the rotary section for receiving the modulated serial signal;
• means provided on the rotary section for demodulating the modulated serial signal;
• and
• means for restoring the control signal from the demodulated serial signal.

A signal transmission system for transmitting a square pulse signal including a sequence of square pulses to a circuit for controlling the circuit at timings of a leading edge and a trailing edge of the square pulse signal, comprising:

• means for generating an edge pulse train, wherein each edge pulse included therein corresponds to an edge of a square pulse in the sequence of square pulses;
• means for generating edge attribute information indicative of a relationship between each edge of the square pulses timing of a square pulse;
• means for converting the edge attribute information into serial data;
• means for aligning the serial data between an edge pulse associated with the trailing edge of a first square pulse in the sequence of square pulses and an edge pulse associated with the leading edge of a second square pulse in the sequence of square pulses;
• means for modulating the edge pulse train including the attribute information;
• means for transmitting the modulated edge pulse train;
• means for receiving the transmitted edge pulse train;
• means for demodulating the received edge pulse train;
• and
• means for restoring the sequence of square pulses from the demodulated attribute information and the edge pulse train.

A signal transmission system comprising:

• a stationary section that produces a control signal;
• a rotary section including a plurality of rotary heads for recording or reproducing information signals on or from a record medium and circuit members for supplying the rotary heads with the information signals or amplifying the information signals reproduced from the rotary heads;
• means provided on the stationary section for generating an edge pulse train, wherein each edge pulse in the edge pulse train corresponds to an edge of a square pulse in a sequence of square pulses;
• means for generating edge attribute information indicative of a relationship between each edge pulse and a timing of a leading edge or a trailing edge of a square pulse in the sequence of square pulses;
• means for converting the edge attribute information to a serial signal;
• means for modulating the serial signal and the edge pulse train;
• means for transmitting the modulated signal to the rotary section;
• means provided on the rotary section for receiving the modulated serial signal;
• means provided on the rotary section for demodulating the modulated serial signal;
• means provided on the rotary section for restoring the edge attribute information from the demodulated serial signal;
• and
• means provided on the rotary section for restoring the sequence of square pulses from the demodulated serial signal based on the restored edge attribute information.

A multiplexed signal receiving system comprising:

• means for receiving a multiplexed signal transmitted from a transmission section;
• means for demodulating a multi-level signal from the received multiplexed signal by frequency demodulation;
• means for decoding serial data and an edge pulse train from the multi-level signal;
• means for reproducing edge attribute information and mode information from the serial data;
• and
• means for reproducing a first square pulse train using the edge attribute information.

A multiplexed signal transmission system comprising:

• means for receiving a train of square pulses aligned at a fixed phase relation with each other;
• means for generating a train of edge pulses corresponding to all edges of square pulses in the train of square pulses;
• means for generating edge attribute information representing an attribute of a second edge following a first edge in a same edge pulse train;
• means for converting a plurality of parallel data including the edge attribute information and mode information, which includes switching information for switching head systems in a multi-head system, into serial data;
• means for aligning the serial data so that the groups of serial data follow each edge pulse in the train of edge pulses;
• means for generating a four-level signal having a reference signal level, a first level associated with clocks for the serial data, a second level associated with the serial data superposed on the clock and a third level associated with the edge pulses;
• and
• a fourth generator for generating a transmission multiplexed signal by frequency modulating the four-level signal.

A multiplexed signal receiving system comprising:

• means for receiving a multiplexed signal
• means for demodulating a multi-level signal from the received multiplexed signal by frequency demodulation;
• means for decoding serial data and an edge pulse train from the multi-level signal;
• means for reproducing edge attribute information and mode information from the serial data;
• means for reproducing a square pulse train from the edge attribute information;
• means for detecting at least one edge of a square pulse in the square pulse train;
• and
• means for reading out head system switching information contained in the reproduced mode information at the edge detecting timing in a multi-head system overlap period.