US4628537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for identifying a responding station for a radio communications system
Assignee: Pioneer Corp
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Filing: 1983-10-18
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Granted: 1986-12-09
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Expires: 2003-10-18
Abstract
Abstract A communications system for identifying a responding station called by a communications system caller station over a call channel and a plurality of speech channels. The system transmits information from the caller station, such as the selected speech channel and the designated responding station through the call channel, and receives information from a responding station on the selected speech channel. The communication between the communications system and the responding station on the selected speech channel is enabled only when information from the responding station is identical to information of the designated responding station transmitted from the communications system.
Inventors
- 👤 Masashi Shimakata
- 👤 Katsuaki Kawamura
- 👤 Toshiaki Tsuchiya
- 👤 Yuichiro Shioya
- 👤 Takao Inoue
- 👤 Mitsuo Syoji
- 👤 Keiichi Kuroda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:19
CPC Classifications
H; H04; H04W; H04W88/00; H04W88/02; H04W88/022
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
A communications system having a plurality of speech channels one of which is to be selected to convey an information, adapted to perform a simplex communication, comprising: a searching operation control means for comanding sequential operations of (I) setting the communications system to a receiving state at a speech channel and detecting the presence of a carrier signal and in turn selecting a next speech channel and detecting the presence of a carrier signal if the carrier signal is present at said speech channel, (II) transmitting an audible signal at a selected speech channel at which the carrier signal is not detected, (III) detecting once more the presence of the carrier signal at the selected speech channel, and (IV) memorizing infomation of the selected speech channel as a non-busy speech channel only if the carrier signal is not present at the selected speech channel.
Claim 2
Dependent Claim
144 words
A communications system having a plurality of speech channels one of which is to be selected to convey an information, adapted to perform a simplex communication, comprising: a searching operation control means for comanding sequential operations of (I) setting the communications system to a receiving state at a speech channel and detecting the presence of a carrier signal and in turn selecting a next speech channel and detecting the presence of a carrier signal if the carrier signal is present at said speech channel, (II) transmitting an audible signal at a selected speech channel at which the carrier signal is not detected, (III) detecting once more the presence of the carrier signal at the selected speech channel, and (IV) memorizing infomation of the selected speech channel as a non-busy speech channel only if the carrier signal is not present at the selected speech channel.
Claim 3
Dependent Claim
207 words
A communications system operative as a caller station and having a plurality of speech channels one of which is to be selected to convey an information and adapted to perform simplex communication using a searching operation of a sequence of (I) setting the communications system to a receiving state at a speech channel and detecting the presence of a carrier signal and in turn selecting a next speech channel and detecting the presence of the carrier signal if the carrier signal is present at the speech channel, (II) transmitting an audible signal at a selected speech channel at which the carrier signal is not detected, (III) detecting once more the presence of the carrier signal at the selected speech channel, and (IV) identifying the selected speech channel as a non-busy speech channel only if the carrier signal is not present at the selected speech channel, said communications system having means for receiving an audible signal transmitted from a third station and generating an output signal while a call between the caller station and a responding station is taking place at the selected speech channel, thereby indicating a break on the selected speech channel by means of the output signal of said means for receiving an audible signal.
Claim 4
Dependent Claim
207 words
A communications system operative as a caller station and having a plurality of speech channels one of which is to be selected to convey an information and adapted to perform simplex communication using a searching operation of a sequence of (I) setting the communications system to a receiving state at a speech channel and detecting the presence of a carrier signal and in turn selecting a next speech channel and detecting the presence of the carrier signal if the carrier signal is present at the speech channel, (II) transmitting an audible signal at a selected speech channel at which the carrier signal is not detected, (III) detecting once more the presence of the carrier signal at the selected speech channel, and (IV) identifying the selected speech channel as a non-busy speech channel only if the carrier signal is not present at the selected speech channel, said communications system having means for receiving an audible signal transmitted from a third station and generating an output signal while a call between the caller station and a responding station is taking place at the selected speech channel, thereby indicating a break on the selected speech channel by means of the output signal of said means for receiving an audible signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |