Patent US4366572A successfully refreshed from Google Patents.
US4366572A
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Data transmission system
Assignee: Mitsubishi Electric Corp
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Filing: 1980-12-08
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Granted: 1982-12-28
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Expires: 2000-12-08
Abstract
Abstract A data transmission system including transmission stations for transmitting a plurality of different kinds of input data and receiving stations for receiving only one kind of the data transmitted from the transmission stations. A transmission station is actuated by the demand of the receiving station and the plural kinds of data are modulated at the modulation central frequency corresponding to the respective data. The demodulation central frequency of each one of the receiving units is set for only one kind of data and only one kind of data transmitted by the transmission units are demodulated in a receiving station.
Inventors
- 👤 Toshiharu Takatsuki
- 👤 Ken-ichi Fujiwara
- 👤 Sinobu Yanagisawa
- 👤 Shigeru Okamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:55
CPC Classifications
H; H04; H04M; H04M11/00; H04M11/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
In a data transmission system having a transmission station for modulating plural kinds of input data and for transmitting the modulated data; and a receiving station for receiving each kind of data transmitted from said transmission station, the improvement comprises: said transmission system having an encoder for responding to a demand from said receiving station to provide said input data in a pulse series code, and a modulator for modulating the output of said encoder, in which each modulation central frequency corresponds to a respective kind of the data and wherein said modulation central frequency is switched depending upon the kind of the data; and, said receiving station having a demodulator in which only one of the modulation central frequencies is used as the demodulation central frequency.
Claim 2
Dependent Claim
127 words
In a data transmission system having a transmission station for modulating plural kinds of input data and for transmitting the modulated data; and a receiving station for receiving each kind of data transmitted from said transmission station, the improvement comprises: said transmission system having an encoder for responding to a demand from said receiving station to provide said input data in a pulse series code, and a modulator for modulating the output of said encoder, in which each modulation central frequency corresponds to a respective kind of the data and wherein said modulation central frequency is switched depending upon the kind of the data; and, said receiving station having a demodulator in which only one of the modulation central frequencies is used as the demodulation central frequency.
Claim 3
Dependent Claim
24 words
A data transmission system according to claim 1 wherein a plurality of the receiving stations and a plurality of the transmission stations are connected.
Claim 4
Dependent Claim
17 words
A data transmission system according to claim 2 wherein said modulator performs frequency shift of the data.
Claim 5
Dependent Claim
17 words
A data transmission system according to claim 2 wherein said modulator performs amplitude modulation of the data.
Claim 6
Dependent Claim
17 words
A data transmission system according to claim 2 wherein said modulator performs frequency modulation of the data.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-12-27 | 1986-06-28 | 1986-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-27 | 1990-06-28 | 1990-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-27 | 1994-06-28 | 1994-12-28 | $7700.00 | Window Closed / Lapsed |