Patent US4435804A successfully refreshed from Google Patents.
US4435804A
Expired / Lapsed
US
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Sub-signal transmitting system
Assignee: Fujifilm Business Innovation Corp
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Filing: 1982-03-12
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Granted: 1984-03-06
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Expires: 2002-03-12
Abstract
Abstract A data transmitting system where transmission in packet form takes place between several stations includes an encoder converting signals into a transmission waveform where the low frequency components are significantly attenuated. A sub-signal, notably a voice signal from a telephone set is multiplied on the low frequency region and also transmitted between the stations.
Inventors
- 👤 Yoichi Tan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:46
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/08; H04J1/085; H04M; H04M11/00; H04M11/06; H04M11/062
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
104 words
A data transmission system wherein data is transmitted in packet form between multiple stations, comprising: main signal transmitting means for a main signal to be transmitted in the form of a packet, said main signal being directed along a transmission path including an encoder, said encoder converting said main signal into a transmission waveform having a power spectrum with significantly attenuated low frequency components; sub-signal transmitting means for a sub-signal to be transmitted, said sub-signal being independent of said main signal and being in the low frequency region of said encoder; means for superimposing said main signal and sub-signal and transmitting the combined signals.
Claim 2
Dependent Claim
104 words
A data transmission system wherein data is transmitted in packet form between multiple stations, comprising: main signal transmitting means for a main signal to be transmitted in the form of a packet, said main signal being directed along a transmission path including an encoder, said encoder converting said main signal into a transmission waveform having a power spectrum with significantly attenuated low frequency components; sub-signal transmitting means for a sub-signal to be transmitted, said sub-signal being independent of said main signal and being in the low frequency region of said encoder; means for superimposing said main signal and sub-signal and transmitting the combined signals.
Claim 3
Dependent Claim
41 words
A transmission system as claimed in claim 1, wherein a voice signal from a telephone set is transmitted as said sub-signal, while a control signal for exchange and connection of telephone sets is transmitted as said main signal in packet form.
Claim 4
Dependent Claim
38 words
A transmission system as claimed in claim 1, said main signal transmitting means including said encoder, said high-pass filter means for cutting off an attenuated low frequency component, and said combining and transmitting means including buffer amplifier means.
Claim 5
Dependent Claim
29 words
A transmission system as claimed in claim 3, further comprising a utilization device within a station for producing said main signal being received by said main signal transmitting means.
Claim 6
Dependent Claim
25 words
A transmission system as claimed in claim 3, said sub-signal transmission means including transmission means and low-pass filter means connected to said buffer amplifier means.
Claim 7
Dependent Claim
44 words
A transmission system as claimed in claims 1, 2 and 3, further comprising interference detector means for detecting whether a packet transmitted via said system has collided with a packet received by the system, and for controlling re-transmission of said data in that event.
Claim 8
Dependent Claim
31 words
A transmission system as claimed in claim 1, further comprising receiver means for said main and sub-signals, including filter means for sorting said signals, and decoder means for said main signal.
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |