Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2000-01-27
2003-03-25
Maung, Nay (Department: 2681)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S550100, C455S566000
Reexamination Certificate
active
06539241
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
This invention relates to a paging amplifier for a cellular phone that amplifies a calling sound. This invention further relates to a paging amplifier for a cellular phone that enables speaking over the cellular phone through a handset. Furthermore, this invention relates to a paging amplifier for a cellular phone that enables a paging broadcast by using a handset. In addition, this invention relates to a configuration of a connection between a cellular phone and a paging amplifier for the cellular phone. Further, this invention relates to a paging amplifier for a cellular phone that enables a handset to be firmly attached to a handset mounting position.
2. Description of Related Art
A cellular phone is very convenient, since a user can carry the cellular phone and can use it immediately after receiving a call. However, sometimes the user cannot carry the cellular phone and leaves it on board a ship, since, for example, water may splash on the cellular phone or the cellular phone can be an obstacle to activities that the user wishes to undertake. Under such conditions, the user sometimes cannot hear a calling sound (ring tone), because the calling sound of the cellular phone is too low or the surroundings are too noisy.
To overcome this inconvenience, the inventors of the present invention are manufacturing and selling a Call Speaker (trade name) for a cellular phone as shown in
FIG. 6
, which is provided with a microphone
52
installed adjacent to a speaker
51
of a cellular phone
50
, and which amplifies an output of the microphone
52
by use of an amplifier
54
, and outputs the amplified output (sound) through an external speaker
55
. The inventors of the present invention are also manufacturing and selling a Call Speaker (trade name) for a cellular phone as shown in
FIG. 7
, which is provided with a plug
57
insertable into a jack
56
of the earphone microphone of the cellular phone
50
, and which amplifies an output of the plug
57
by use of the amplifier
54
, and outputs the amplified output (sound) through the external speaker
55
. Thus, since the Call Speaker amplifies and broadcasts the calling sound of the cellular phone, the user does not miss the calling sound.
As described above, the user will not miss the calling sound any more, since the Call Speaker amplifies and broadcasts the calling sound of the cellular phone. However, after hearing the calling sound, the user cannot use the cellular phone unless the user goes to the location of the cellular phone, removes the microphone or the plug from the cellular phone and operates a receiving button of the cellular phone. Thus, since there are many operation steps necessary to make the cellular phone operational, the user may take a long time to begin speaking, or sometimes cannot even speak, in a worst case.
There are two types of cellular phones: those that have a three-port earphone microphone terminal and those that have a four-port earphone microphone terminal. Accordingly, when a paging amplifier for a cellular phone is connected to an earphone microphone terminal of a cellular phone, two types of paging amplifiers, which have three and four terminals, should be provided according to the type of the cellular phones.
There is a wall hanging type telephone, an indoor intercom device, and an automobile telephone, which are similar to the paging amplifier having the handset for a cellular phone. In these devices, the main body of the device is hung on a wall, and a handset has a narrow part (or neck) on a speaker side to be hung in the main body. The main body of the automobile telephone has a recess to engage a handset therein. The above-described hanging mechanism and engaging mechanism of the handset satisfies basic requirements for the paging amplifier for the cellular phone to be hung on a wall or pillar (i.e., vertical post), is secure against vibration, pitching and rolling. However, by these mechanisms, the paging amplifier cannot be attached on a ceiling or to an inclined overhang. In addition, there is insufficient reliability to remain secure in the presence of large vibrations or pitching. If the strength of hanging or engagement is made bigger to increase the reliability that the handset remains secured, it becomes difficult to pick up the handset and it becomes inconvenient to use it.
This invention is made to provide a paging amplifier for a cellular phone, which has a handset support member so as to permit attaching the paging amplifier on a ceiling and on inclined overhang, as well as on a wall and a pillar, to increase the reliability of engagement against large vibration and pitching, and yet still be easy to pick up.
SUMMARY OF THE INVENTION
To achieve the above and other goals, the present invention provides a paging amplifier for a cellular phone, which includes an input/output terminal connected to an earphone microphone terminal of the cellular phone. An output terminal of the paging amplifier is connected to an external speaker. The paging amplifier includes a handset that has a microphone and a speaker, and a detector that detects whether the handset is in a predetermined position. A calling sound of the cellular phone is input to the paging amplifier through the earphone microphone terminal and the input/output terminal. The paging amplifier amplifies the input calling sound and outputs the amplified calling sound to the external speaker through the output terminal. The external speaker receives and broadcasts the amplified calling sound. When the handset is removed from the predetermined position, the detector detects the action and stops the calling sound. According to the present invention the predetermined position of the handset is not limited to a hook on which the handset is hung. For example, it is possible to provide a sensor that detects when the handset is laid on a predetermined position.
According to the present invention, since the paging amplifier for the cellular phone amplifies the calling sound of the cellular phone and outputs the amplified sound through the external speaker, the user does not miss hearing the calling sound. Further, since the calling sound stops when the handset is operated (removed from the predetermined position), it is very convenient. It is preferable to automatically enable the user to speak over the telephone through the handset after the calling sound is stopped in response to the removal of the handset from the predetermined position. Further, it is preferable that the sound volume of the calling sound is adjustable by using a sound adjusting switch or volume controller that is provided preceding the sound amplifier.
The present invention further provides a paging amplifier for a cellular phone, which includes a handset having a microphone and speaker, and an input/output terminal connectable to an earphone microphone terminal of the cellular phone. A voice sound input from the microphone of the handset is supplied to the cellular phone via the input/output terminal of the paging amplifier. A voice sound signal output from the cellular phone is supplied to the handset via the input/output terminal of the paging amplifier and is output from the speaker of the handset.
According to the present invention, since the cellular phone and the paging amplifier for the cellular phone are connected with each other, the user can speak over a telephone by using the handset. After the calling sound is stopped by the above-described operation (removal of the handset from the predetermined position), the user can immediately start speaking over the telephone without any additional operation. Thus, the user can use the cellular phone very conveniently. The sound volume of the handset can be adjusted by using a volume controller provided on the cellular phone.
In accordance with another aspect of the present invention, there is provided a paging amplifier for a cellular phone, which includes an on/off switch which is actuated when a handset is removed from a predetermined position, in a circuit that
Motohashi Masaki
Sakanoue Hisafumi
Greenblum & Bernstein P.L.C.
Maung Nay
Noboru Electric Co., Ltd.
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