Caller ID device with a power saving function

Details Caller ID device with a power saving function Caller ID device with a power saving function

1999-05-27

2001-02-27

Nguyen, Duc (Department: 2643)

Telephonic communications

Reception of calling information at substation in wireline...

Blocking caller id transmission

C379S088190, C379S088210, C379S093230

Reexamination Certificate

active

06195421

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a caller ID device, and in particular to a caller ID device with a power saving function by additionally using a current limiting circuitry and/or an FSK mark or space tone detector.
2. Description of the Related Art
A caller ID service that has been widely used in the North American countries can inform a user of the telephone number and the name of a calling party. Furthermore, with such a caller ID service provided, the user can be informed of the telephone number and the name of the calling party regardless of being at an off-hook state or an on-hook state.
Referring to
FIG. 1
, a conventional caller ID device
20
and a telephone
10
is shown. In
FIG. 1
, the conventional caller ID device
20
is electrically coupled to a pair of telephone lines (i.e., a tip terminal and a ring terminal) together with the telephone
10
. The conventional caller ID device
20
includes a CAS (Customer Premises Equipment Alerting Signal) receiver
24
, an FSK (Frequency Shift Keying) receiver
26
, a controller
22
, a voltage regulator
28
, an LCD display
29
, a DC battery
30
and an AC adaptor
32
. Once the telephone
10
is switched into an off-hook state, the controller
22
detects an off-hook signal through a hook detector
12
of the telephone
10
and then outputs a control signal to activate the CAS receiver ready to receive a CAS signal from the pair of the telephone lines. If a CAS signal is coming from the telephone exchange through the pair of the telephone lines and received by the CAS receiver
24
, the CAS receiver
24
outputs a CAS detecting signal to the controller
22
. In response to the received CAS detecting signal, the controller
22
outputs a control signal to a speech network
14
of the telephone
10
to mute receiving and transmitting speech signals and another control signal to activate the FSK receiver
26
ready to receive an FSK modulated signal from the pair of the telephone lines. At the same time, a DTMF signal that represents a “D” signal with frequencies of 941 Hz and 1633 Hz is output from the controller
22
to the speech network
14
so as to inform the telephone exchange that FSK modulated data containing the telephone number and the name of a calling party can be send out. When the activated FSK receiver
26
receives an FSK modulated signal from the pair of the telephone lines, the FSK receiver
26
demodulates it into an FSK demodulated signal. Then, the FSK demodulated signal is outputted from the FSK receiver
26
to the controller
22
and then displayed on the LCD display
29
.
On the other hand, when the telephone is switched into an on-hook state, the controller
22
detects an on-hook signal through the hook detector
12
and outputs a control signal to activate the FSK receiver
26
ready to receive FSK modulated data. Similarly, the activated FSK receiver can receive and demodulate an FSK modulated signal coming from the pair of the telephone lines into an FSK demodulated signal. Thereafter, the FSK demodulated signal is transmitted to the controller
22
from the FSK receiver
26
and then displayed on the LCD display
29
. Typically, an on-hook data transmission FSK modulated signal consists of a channel seizure signal with a duration of 300 m sec, a mark signal with a duration of 50 m sec and a data signal in sequence as shown in
FIG. 2
, wherein the channel seizure signal is a dual-frequency signal having a mark frequency and a space frequency alternating at 1200 baud with each other.
In the conventional caller ID device
20
, the CAS receiver
24
and the FSK receiver
26
are continuously activated once at an on-hook state and an off-hook state, respectively, resulting in more power consumption. Even though the AC adaptor
32
additionally used can last the life time of the DC battery
30
, more power consumption caused by both the CAS receiver
24
and the FSK receiver
26
still exits.
SUMMARY OF THE INVENTION
In view of the above, the invention provides a first caller ID device with a power saving function. The first caller ID device, electrically coupled to a pair of telephone lines together with a telephone, includes a CAS receiver, a current limiting circuitry, a diode, an FSK receiver, a controller, a display and a battery. The CAS receiver is used to receiver a CAS signal from the pair of the telephone lines and then to transmit a CAS detecting signal in response to the received CAS signal after the CAS receiver is activated at an off-hook state. The current limiting circuitry has an input end electrically coupled to the telephone and an output end electrically coupled to the CAS receiver for directing an operating current from the pair of telephone lines to the CAS receiver through the telephone at the off-hook state. The diode has a p-type end and an n-type end which is electrically coupled to the output end of the current limiting circuitry. The FSK receiver is used to receive and to demodulate an FSK modulated signal from the pair of the telephone lines into an FSK demodulated signal after the FSK receiver is activated. The controller is used to activate the CAS receiver when the controller detects the telephone is at the off-hook state, to activate the FSK receiver when receiving the CAS detecting signal from the CAS receiver, to receive the FSK demodulated signal from the FSK receiver, and to inactivate the activated FSK receiver once the controller detects no FSK demodulated signal received or already receives the FSK demodulated signal. The display is used to display the FSK demodulated signal output from the controller. And, the battery has a positive polarity electrically coupled to the p-type end of the diode, the FSK receiver and the controller for power supply and a negative polarity electrically coupled to ground. At the on-hook state, the battery further provides a standby current to the CAS receiver through the diode.
In the first caller ID device, there is no need to have an additional AC adaptor installed to last the life time of the DC battery because the current limiting circuitry is used to direct an operating current from the pair of telephone lines to the activated CAS receiver for power supply at the off-hook state. That is, the use of the DC battery can last for a long period of time even though without installing an additional AC adaptor.
Furthermore, the invention provides a second caller ID device with a power saving function. The second caller ID device, electrically coupled to a pair of telephone lines together with a telephone, includes an FSK receiver, an FSK mark or space tone detector, a controller, a display and a battery. The FSK receiver is used to receive and to demodulate an FSK modulated signal from the pair of the telephone lines into an FSK demodulated signal after the FSK receiver is activated. The FSK mark or space tone detector is used to detect an FSK mark or space signal from the pair of telephone lines and then to output an FSK mark or space detecting signal in response to the received FSK mark or space signal at an on-hook state. The controller is used to activate the FSK receiver when receiving the FSK mark or space detecting signal from the FSK mark or space tone detector, to receive the FSK demodulated signal from the FSK receiver and to inactivate the activated FSK receiver once the controller detects no FSK demodulated signal received or already receives the FSK demodulated signal, and then resets the FSK mark or space tone detector. The display is used to display the FSK demodulated signal output from the controller. And, the battery has a positive polarity electrically coupled to the CAS receiver, the FSK receiver, the FSK mark or space tone detector and the controller for power supply and a negative polarity electrically coupled to ground.
In the second caller ID device, the FSK receiver is activated at the on-hook state after the FSK mark or space tone detector detects the FSK mark or space signal and then outputs the FSK mark or space detecting signal. Therefore, only less power

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