Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
1998-02-24
2001-12-25
Pascal, Leslie (Department: 2633)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S199200, C359S199200
Reexamination Certificate
active
06333802
ABSTRACT:
TECHNICAL FIELD
This invention relates to a digital signal transmitter in which serial digital signals supplied from a peripheral device such as a video tape recorder or a switcher are first converted into optical signals and subsequently the converted signals are transmitted to the receiver side.
BACKGROUND ART
If, with the use of, for example, a video tape recorder or a switcher as a transmission side peripheral device, it is attempted to transmit full-band high-vision (high definition TV or HDTV) digital signals (not compressed; 1.485 Gbps) from the transmission side peripheral device over a medium to long range distance to a receiving side peripheral device, such as a monitor device, there is known a method of converting parallel hi-vision signals supplied from the transmission side peripheral device via parallel digital interface into serial optical signals by an optical transmission device
51
, transmitting the converted serial optical signals over an optical fiber
52
to the optical transmission device
51
to an optical receiving device
53
, re-converting the transmitted signals by a parallel digital interface by the optical receiving device
53
and sending the resulting signals over the parallel digital interface to the receiving side peripheral device, as shown in FIG.
1
.
There is also known a method of converting analog hi-vision signals, such as Y, Pb or Pr, sent from the transmitting side peripheral device over an analog interface, into optical signals by an optical transmission device
61
, transmitting the optical signals over an optical fiber
62
to an optical receiving device
63
, re-converting the transmitted optical signals into analog hi-vision signals by the optical receiving device
63
and sending the resulting signals to the receiving side peripheral device, as shown in FIG.
2
.
Meanwhile, if parallel hi-vision signals are sent from the transmitting side peripheral device to the optical transmission device
51
via the parallel digital interface or from the optical receiving device
53
to a receiving side peripheral device via the parallel digital interface, as shown in
FIG. 1
, there is produced transmission delay unbalance between cables. If devices having parallel digital interface are separated a long distance from each other, synchronous detection by the receiving side becomes difficult. Moreover, a large number of transmission circuits are required.
If the transmitting side peripheral devices are connected to the optical transmission device
61
over an analog interface, as shown in
FIG. 2
, transmission delay unbalance is similarly produced between cables. Moreover, signal deterioration is severer than with digital signals thus necessarily imposing limitations on the distance between devices.
In both of the above methods, plural transmission paths (mediums) such as cables are required between the transmitting side peripheral device and the optical transmitting device, thus increasing the number of connection steps and the system size.
In addition, both methods suffer from an inconvenience in connection with extension of point-to-point connection due to system configurations.
In view of the foregoing, it is an object of the present invention to provide a digital signal transmission device in which sound quality deterioration to the receiving side peripheral device can be suppressed despite the fact that no complex structure is necessitated.
It is another object of the present invention to provide a digital signal transmission device in which plural transmission mediums are not needed for interconnection with the receiving side peripheral devices.
DISCLOSURE OF THE INVENTION
In a digital signal transmission device of the present invention, optical transmission means converts serial hi-vision digital signals sent from a peripheral device over a coaxial cable into serial digital optical signals to transmit the resulting signals by optical transmission. An optical receiver receives the serial digital optical signals sent from the optical transmission means over the optical fiber to convert the signals into serial hi-vision digital signals to transmit the converted signals to a coaxial cable.
There is produced no transmission delay unbalance between the transmitting side peripheral device and the optical transmission means or between optical receiving means and the receiving side peripheral device as occurs with the use of a conventional parallel digital interface or analog interface.
In a digital signal transmission device of the present invention, a plurality of optical transmission means convert serial hi-vision digital signals sent from a transmitting side peripheral device over a coaxial cable into serial digital optical signals, to transmit the resulting signals by optical transmission. A plurality of optical receiving means receive the serial digital optical signals sent from the plural optical transmission means to convert the signals into serial hi-vision digital signals to transmit the converted signals to a receiving side peripheral device.
Since each of the plural optical transmission means has an active loop through-terminal enclosed therein, there is no necessity of constructing the entire system as a parallel type system if there is only one serial digital interface in the transmitting side peripheral device.
REFERENCES:
patent: 5517232 (1996-05-01), Heidemann et al.
patent: 5663823 (1997-09-01), Suzuki
patent: 5701186 (1997-12-01), Huber
patent: 5715012 (1998-02-01), Patel et al.
patent: 4-17483 (1992-01-01), None
patent: 4-79530 (1992-03-01), None
patent: 4-238428 (1992-08-01), None
patent: 4-281646 (1992-10-01), None
patent: 4-369931 (1992-12-01), None
patent: 5-260450 (1993-10-01), None
patent: 06141000 (1994-05-01), None
patent: 6-141000 (1994-05-01), None
patent: 06141000 A (1994-05-01), None
Kuramochi Fumito
Morioka Yoshihiro
Ogawa Tetsuo
Sawaguchi Kenichi
Bell Boyd & Lloyd LLC
Pascal Leslie
Phan Hanh
Sony Corporation
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