Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1990-10-19
1992-08-11
Dwyer, James L.
Telephonic communications
Audio message storage, retrieval, or synthesis
379388, 379420, 379432, 379435, 379440, 455 89, 455 90, 343702, 343720, D14138, D14149, D14150, H04M 1100, H04M 908
Patent
active
051386518
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a cordless loud-speaking telephone and, more particularly, to a cordless loud-speaking telephone not of the usual portable type, but of the table-top or hanging-from-ceiling type and provided with a receiving speaker housed in a box and a transmitting microphone attached to an antenna projected from a ball casing to allow the user to talk with a companion through the telephone with his hands left free.
BACKGROUND OF THE INVENTION
A cordless telephone exists which allows the user to come to the door, to ask "who is it" when the door bell is ringing while he is talking on the telephone. Conventional cordless telephones ;f this kind are intended to be portable, thus allowing the user to talk to his companion while moving around. Most of these are of the wireless portable (or handy transceiver) type in which the transmitter and the receiver are housed in a box or handset and an antenna projects from the handset. However, there exists no telephone similar to that of the present invention, which is of the floor or table-to; type and which allows the user to talk with his companion, leaving his hands free.
There exist portable wireless telephones which house a speaker in a box to make the received voice loud, but they are usually of the press talk type. A hands-free telephone that allows transmitting and receiving communications to be made at the same time and that can be conveniently used for various meetings has not yet been realized.
Hands-free wire (or cord) telephones of various kinds have been produced. These telephones house a speaker and a microphone in a box, making it easy to use as an interphone.
With these telephones, however, the voice received through the speaker, which is adjacent to or near the microphone (or separated from the microphone by about 10 cm), is received more strongly by the microphone than the voice of the person who is remote (50 cm or more) from the microphone. As a result, the voice received through the speaker i: fed back through the telephone circuit, causing howling and echo, thereby disturbing the talking through the telephone. To solve this problem, an alternately-talking system actuated by a voice control switch which causes the received voice to vanish at its start and end, or alternatively an echo canceller system (high in cost) is required.
DISCLOSURE OF THE INVENTION
The present invention is therefore intended to eliminate the above-mentioned drawbacks which could not be avoided in conventional hands-free telephones.
Accordingly, a first object of the present invention is to provide a cordless hands-free loud-speaking telephone which is lower in cost and enables more reliable same-time talking but does not use the above-mentioned specific circuit systems.
The design and construction of conventional hands-free telephones requires that the speaker and the microphone be located together adjacent to the desk or table top from the viewpoint of their constructions adapted considering their designs. This is why their transmitting voice collecting characteristic is relatively poor.
A second object of the present invention is therefore to provide a hands-free loud-speaking telephone with a better transmitting voice collecting characteristic.
In the case of portable cordless telephones, the hand by which the telephone was grasped, and the human body, acted to enhance the earthing effect. When the telephone was not grasped by hand, radio radiation efficiency was lowered, causing reception to deteriorate.
A third object of the present invention is therefore to provide a table-top-type cordless loud-speaking telephone with excellent radio radiation efficiency and reception gains.
These and other objects of the present invention can be achieved by a cordless loud-speaking telephone comprising an appropriately-shaped casing, radio transmitting and receiving circuits and a receiving speaker housed in the casing, an antenna conductor extending outside the casing and counterpoises similarly extending outside the casing, and a
REFERENCES:
patent: 2093158 (1937-09-01), Pratt
patent: 2840694 (1958-06-01), Morgan
patent: 3247515 (1966-04-01), Boyer
patent: 3993998 (1976-11-01), Kimmett
patent: 4078155 (1978-03-01), Dotros et al.
patent: 4555592 (1985-11-01), Deinzer
patent: 4650931 (1987-03-01), Tsukada et al.
patent: 4679233 (1987-07-01), Richardson et al.
Bost Dwyane D.
Dwyer James L.
Fujitsu Limited
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