US4558321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Visitor conversation system
Assignee: Soken Inc
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Filing: 1983-05-09
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Granted: 1985-12-10
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Expires: 2003-05-09
Abstract
Abstract A novel visitor conversation system comprising a single transmitter-receiver. The distance to an incoming person is measured by receiving an ultrasonic wave signal propagated from the transmitter-receiver and reflected on the person. When the distance is shorter than a predetermined detection distance, it is decided that the person is a visitor. The transmitter-receiver further propagates an ultrasonic wave amplitude-modulated on an audio signal, and the signal received is demodulated for the purpose of a speech. The visitor detection and the conversation with a vehicle carrying a speaking device are performed by a single medium.
Inventors
- 👤 Yoshiyuki Kago
- 👤 Shigeyuki Akita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:44
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/16; G08B13/1609; G08B13/1618; G08B7/00; G08B7/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
277 words
A visitor conversation system comprising: a transmitter-receiver; a vehicle carrying communication means for transmitting and receiving ultrasonic speech information signals to and from said transmitter-receiver; visitor detector means for measuring the distance between said transmitter-receiver and a visitor by receiving reflections from said visitor of ultrasonic waves propagated from said transmitter-receiver and for generating a visitor detection signal when said visitor is within a predetermined detection distance; a handset provided indoors for generating an audio signal from speech information; transmitter-receiver means, connected to said transmitter-receiver, for amplitude-modulating said audio signal from said handset to propagate said ultrasonic speech information signals from said transmitter-receiver and for demodulating said ultrasonic speech information signals received by said transmitter-receiver to generate a voice from said handset related to speech information from said communication means; control means for generating a speech detection signal when said transmitter-receiver receives said ultrasonic speech information signals from said communication means; change-over switch means for electrically connecting said transmitter-receiver and said visitor detector means when said control means is not generating said speech detection signal and for electrically connecting said transmitter-receiver and said transmitter-receiver means when said control means generates said speech detection signal; display means, responsive to said visitor detector means and said control means, for performing a first display for indicating a visitor in response to said visitor detection signal and for performing a second display for indicating speech information in response to said speech detection signal; hook switch means for generating a rest signal when said handset is in a rest position; and means for ending said second display in said display means when said hook switch means does not generate said rest signal.
Claim 2
Dependent Claim
277 words
A visitor conversation system comprising: a transmitter-receiver; a vehicle carrying communication means for transmitting and receiving ultrasonic speech information signals to and from said transmitter-receiver; visitor detector means for measuring the distance between said transmitter-receiver and a visitor by receiving reflections from said visitor of ultrasonic waves propagated from said transmitter-receiver and for generating a visitor detection signal when said visitor is within a predetermined detection distance; a handset provided indoors for generating an audio signal from speech information; transmitter-receiver means, connected to said transmitter-receiver, for amplitude-modulating said audio signal from said handset to propagate said ultrasonic speech information signals from said transmitter-receiver and for demodulating said ultrasonic speech information signals received by said transmitter-receiver to generate a voice from said handset related to speech information from said communication means; control means for generating a speech detection signal when said transmitter-receiver receives said ultrasonic speech information signals from said communication means; change-over switch means for electrically connecting said transmitter-receiver and said visitor detector means when said control means is not generating said speech detection signal and for electrically connecting said transmitter-receiver and said transmitter-receiver means when said control means generates said speech detection signal; display means, responsive to said visitor detector means and said control means, for performing a first display for indicating a visitor in response to said visitor detection signal and for performing a second display for indicating speech information in response to said speech detection signal; hook switch means for generating a rest signal when said handset is in a rest position; and means for ending said second display in said display means when said hook switch means does not generate said rest signal.
Claim 3
Dependent Claim
32 words
A visitor conversation system according to claim 1, wherein said visitor detector means generates said visitor detection signal only after said visitor has been within said detection distance for a predetermined time.
Claim 4
Dependent Claim
43 words
A visitor conversation system according to claim 1, within said display means includes sound generating means for generating a first frequency sound in response to said visitor detection signal and for generating a second frequency sound in response to said speech detection 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) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |