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Mobile Phone Patent Abstract
A mobile phone charger also functioning as a remote sound monitoring
device is provided. The charger internally includes a high-sensitive
microphone, a DTMF decoder, and a central processing unit (CPU).
When a handset of a mobile phone is disposed in a handset w/battery
charging socket on the charger, an in-car hand-free enabling circuit
in the charger is enabled for the handset in the charger to charge
while entering into a hand-freemode. At this point, the charger
substitutes for the handset and the CPU in the charger automatically
receives signals of in-coming call over the mobile phone and the
mobile phone does not ring. On receipt of a signal of an in-coming
call, the CPU prompts the caller to enter a code that is decoded
and compared by the DTMF decoder with a code preset in the CPU.
When the entered code is determined as correct, the high-sensitive
microphone is turned on to pick up sound at the site of charging
and transmits the picked sound via the handset for the caller to
perform a sound monitoring from a remote position.
Mobile Phone Patent Claims
What is claimed is:
1. A mobile phone charger also functioning as a remote sound monitoring
device, comprising: an in-coming call detecting circuit electrically
connected to a connecting port externally provided on a handset
of a mobile phone disposed in a charging socket on said charger
for detecting a ringing signal of an in-coming call; a decoder electrically
connected to said connecting port externally provided on said handset
and to a central processing unit (CPU) in said charger for comparing
a DTMF code entered by a caller via keys on a phone with a preset
code stored in said CPU; a free-hand enable switch, said free-hand
enable switch in an ON state enabling said mobile phone charger
to function as a charger and a remote sound monitoring device at
the same time, and said free-hand enable switch in an OFF state
enabling said charger to function as a regular mobile phone charger;
a switch circuit electrically connected to said CPU and to an amplifying
circuit for controlling on or off of an amplifier in said amplifying
circuit; and said amplifying circuit being electrically connected
to a high-sensitive microphone and said external handset connection
port for picking up sound source at the site of charging for the
remote sound monitoring purpose; whereby when said in-coming call
detecting circuit detects a signal of an in-coming call, said charger
beeps via said CPU to prompt the caller to enter a security code,
and said encoder compares said code entered by the caller with a
code preset and stored in the CPU of the charger; said high-sensitive
microphone is turned on when said entered code is determined as
correct in order to pick up sound source at the site of charging;
and said sound source picked up at the site of charging is transmitted
to the caller over a communication network to which said mobile
phone is connected, so that the caller is able to perform a sound
monitoring from a remote position.
Mobile Phone Patent Description
BACKGROUND OF THE INVENTION
The present invention relates to a mobile phone charger, and more
particularly to a mobile phone charger that includes internal in-car
hand-free enabling circuit and high-sensitive microphone and therefore
permits a mobile phone disposed in the charging socket to enter
into a hand-free mode while the microphone picks up a sound source
at the site of charging. The picked sound source may be transmitted
via a communication network to which the mobile phone is connected.
A caller of an in-coming call over the mobile phone under charging
may enter a preset code to perform a sound monitoring from a remote
position.
A conventional remote sound monitoring device designed for securing
purpose usually has a limited data transmission distance within
the range from 50M to 500M, depending on the radio frequency designed
for the device. And, such remote sound monitoring device transmits
data in the manner of analog transmission and is therefore subject
to bugged by other detecting devices. Moreover, such remote sound
monitoring device is powered by batteries and not adapted to monitor
for a prolonged time period. These problems prevent the conventional
remote sound monitoring device from working ideally.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide a mobile
phone charger that may also function as a remote sound monitoring
device to transmit picked sound via a communication network to which
a mobile phone disposed in the charger is connected.
In an aspect of the present invention, the charger includes a handset
w/battery charging socket that is electrically connected to an in-car
hand-free enabling circuit internally provided in the charger. When
a mobile phone is disposed in the handset w/battery charging socket,
it is automatically switched into the hand-free mode, and the ringing,
receiving, and calling functions of the mobile phone are replaced
by a high-sensitive microphone internally provided in the charger.
In another aspect of the present invention, the charger internally
includes a high-sensitive microphone and related amplifying circuit
and a central processing unit (CPU). When a handset of a mobile
phone is disposed in a handset w/battery charging socket on the
charger, an in-car hand-free enabling circuit in the charger is
enabled for the handset in the charger to charge while entering
into a hand-free mode and in a standby state. At this point, the
charger substitutes for the handset and the CPU in the charger automatically
receives signals of in-coming call over the mobile phone and the
mobile phone does not ring. On receipt of a signal of an in-coming
call, the CPU conditionally turns on the high-sensitive microphone
for the latter to pick up sound at the site of charging and transmit
the picked sound via a cellular communication network to which the
charging handset is connected, so that a caller may perform a sound
monitoring from a remote position.
In a further aspect of the present invention, the charger includes
a CPU, a high-sensitive microphone and related amplifying circuit,
and a DTMF decoder. When a mobile phone is disposed in the charge
and the CPU receives a signal of an in-coming call, the CPU beeps
to prompt the caller to enter a security code within a preset time
period. The entered code is decoded and compared by the DTMF decoder
with a code preset in the CPU. Only when the entered code is determined
as correct will the high-sensitive microphone be turned on to pick
up sound at the site of charging and transmit the picked sound via
a cellular communication network to which the charging handset is
connected. Therefore, the sound monitoring from a remote position
is performed in a strictly confidential manner.
BRIEF DESCRIPTION OF THE DRAWINGS
The structure and the technical means adopted by the present invention
to achieve the above and other objects can be best understood by
referring to the following detailed description of the preferred
embodiments and the accompanying drawings, wherein
FIG. 1 is a block diagram of a circuitry for a conventional mobile
phone charger;
FIG. 2 is a block diagram of a circuitry for a mobile phone charger
according to the present invention;
FIG. 3 is a circuit diagram for a mobile phone charger according
to a preferred embodiment of the present invention;
FIG. 4 is a charging circuit diagram for the mobile phone charger
of the present invention; and
FIG. 5 is a flow chart showing steps included in the operation
of the mobile phone charger of the present invention;
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Please refer to FIG. 1 that is a block diagram of a circuitry for
a conventional mobile phone charger. In the circuitry, there is
mainly a voltage dropping and rectifying circuit 11 connected to
a utility power supply for converting the supplied utility power
into a direct current (DC) voltage. The converted DC voltage is
then output to a charging circuit 12. The charging circuit 12 is
electrically connected to a battery-only charging socket 13 and
a handset w/battery charging socket 14 on the charger, as well as
to a central processing unit (CPU) 15 in the charger. The CPU 15
is further electrically connected to a liquid crystal display (LCD)
16 and a keyboard circuit 17. A charging function may be set via
the keyboard circuit 17, so that a battery or a mobile phone may
be positioned in the charging sockets 13 and/or 14 and be charged.
FIG. 2 is a block diagram of a circuitry for a mobile phone charger
according to the present invention. This circuitry includes, in
addition to the circuits designed for the conventional mobile phone
charger, a hand-free enabling circuit 26 electrically connected
to the CPU 15. When a handset of a mobile phone is disposed in the
handset w/battery charging socket 14 on a charger of the present
invention so that the charging socket 14 is electrically connected
to a connection port 29 externally provided on the handset, hand-free
detecting pins on the handset electrically connect to the hand-free
enabling circuit 26 in the charger. When an enabling switch 28 in
the hand-free enabling circuit 26 is in the ON state, the handset
of the mobile phone in the charging socket 14 enters into an in-car
hand-free mode and is in a standby state. The CPU 15 in the charger
of the present invention is operated through detecting software
and is connected to a switch circuit 21 that is connected to an
amplifying circuit 23 and a high-sensitive microphone 22 in order
to control the on and off of the amplifying circuit 23.
The charger of the present invention also includes a DTMF decoder
24 that is in the form of an IC and an in-coming call detecting
circuit 25, both of which are electrically connected to the handset
w/battery charging socket 14 on the charger and accordingly, to
the external connection port 29 on the handset of the mobile phone.
The in-coming call detecting circuit 25 is capable of detecting
signals of in-coming calls and the DTMF decoder 24 is capable of
determining a security code entered by a caller. Outputs of the
DTMF decoder 24 and the in-coming call detecting circuit 25 are
electrically connected to the CPU 15, so that the CPU 15 turns or
not turns on the switch circuit 21 based data sent by the in-coming
call detecting circuit 25 and the DTMF decoder 24 to the CPU 15.
There is also a warning sound generator 27 connected to the CPU
15. When the in-coming call detecting circuit 25 detects a signal
of an in-coming call, the warning sound generator 27 sounds to prompt
the caller to enter the code.
After the signal of an in-coming call is detected and the code
entered by the caller is compared and found correct by the DTMF
decoder 24, the CPU 15 turns on the switch circuit 21, enabling
the high-sensitive microphone 22 to pick up sound source at the
site at where the mobile phone is located and charged. The picked
sound source is then output via the connection port 29 to the handset
of the mobile phone. The sound sent to the mobile phone could be
transmitted over a cellular communication network to which the mobile
phone is connected, enabling the caller to perform a sound monitoring
from a remote position.
Please now refer to FIGS. 3 and 4 that respectively show an overall
circuitry and a charging circuit for the charger according to a
preferred embodiment of the present invention. The CPU (89C2501)
15 is connected to the switch circuit 21 composed of Q1, the DTMF
decoder (LC9385) 24, and the detecting circuit 25 composed of Q3,
R7, C6, etc. The switch circuit 21 is connected at a collector of
the Q1 to the amplifying circuit 23 composed of amplifier (OP07)
R11, R12, etc. And, an input of the amplifying circuit is connected
to the high-sensitive microphone 22. With these arrangements, the
detecting circuit 25 is able to detect a signal of an in-coming
call and the decoder 24 is able to decode and compare a code entered
by a caller with a code preset in the CPU. When the code entered
by the caller is found correct by the decoder 24, the switch circuit
21 is caused to turn on for the microphone 22 to pick up a sound
source that is then amplified by the amplifying circuit 23. The
amplified sound source could be transmitted to the caller via the
communication network to which the mobile phone is connected, so
that the caller may perform a sound monitoring at a remote position.
The charging circuit for the charger of the present invention includes
a flip-flop composed of a UIB. An output of the flip-flop is connected
to a comparator composed of a TLC271. When a battery being charged
at a BTI is fully charged, the comparator resets the flip-flop.
Thus, an automatic charging of the mobile phone is possible on the
charger of the present invention.
FIG. 5 is a flow chart showing steps included in the operation
of the charger of the present invention. First, the handset of the
mobile phone is disposed in the handset w/battery charging socket
14, so that the hand-free enabling switch 28 enables the hand-free
enabling circuit 26 for the handset of the mobile phone in the charging
socket 14 to enter into the in-car hand-free mode. At this point,
the charger, which is an external device related to the mobile phone,
substitutes for the ringing, receiving, and calling functions of
the handset of the mobile phone and is in a standby state ready
for remote sound monitoring. When there is an in-coming call, the
charger beeps to prompt the caller to enter a security code within
a specified time period. After the caller enters the code, the charger
will determine whether the entered code is correct or not. In the
event the entered code is incorrect and the line is still connected,
the charger will beep again to prompt the caller to enter the code
again. And, in the event the entered code is incorrect and the line
is disconnected, the charger restores to the standby state.
On the other hand, when the entered code is determined as correct,
the high-sensitive microphone is turned on to pick up sound source
at the site, and the sound picked up is transmitted to the caller
via the communication network to which the mobile phone is connected,
so that the caller is able to perform a sound monitoring from a
remote position. When the caller ends the remote sound monitoring
and hangs up the phone, the high-sensitive microphone is turned
off and the charger restores to the standby state.
In brief, the present invention provides a mobile phone charger
that employs a decoder and a high-sensitive pick-up microphone to
pick up sound source at the site of charging and transmits the picked
sound via the communication network to which the mobile phone is
connected. Therefore, the mobile phone charger enables a qualified
caller to do sound monitoring from a remote position. Moreover,
the charger of the present invention enables the mobile phone disposed
in the charging socket of the charger to enter into the in-car hand-free
mode with the original ringing, receiving, and calling functions
of the mobile phone replaced by the high-sensitive pick-up microphone.
The mobile phone charger of the present invention therefore ensures
the security at the site of charging and the continuous supply of
power to the mobile phone at the same time.
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