Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Reexamination Certificate
1998-06-02
2001-06-05
Le, Huyen (Department: 2643)
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
C379S088210, C379S142030
Reexamination Certificate
active
06243461
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATION
This application claims the priority benefit of Taiwan application Ser. No. 87206061, filed Apr. 21, 1998, the full disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a receiving apparatus preferably used in telephone with functions to process a caller-identification, and more particularly to a function, which is able to process the caller-identification and automatically detect signal of channel seizure and then process the message-waiting.
2. Description of Related Art
The emergence of the telephone has allowed two far apart places to be brought seemingly close together. Nowadays, due to the highly developed technology of telecommunication, functions of the telephone have been significantly promoted either, for example, functions of a fixed forward, a call waiting, a caller-identification, and a voice mail box. The function of a caller-identification apparatus is such that when a call rings, the receiver is able to obtain the telephone number and other related information through the caller-identification to decide whether to receive the call or not and thus prevent receiving unnecessary calls. The function of a voice mailbox is to provide a service for leaving messages when the receiving party can't receive the call at the time it was placed.
The protocol of sending a caller-identification (caller-ID) was developed by Bell Communications Research (Bellcore). When a call is dialed, the data message of the caller-ID is sent from the switchboard to the destination every two seconds. Referring to
FIG. 1
, the protocol for sending a caller-ID is arranged in a time sequence, in which a ring
10
is sent first. About 0.5 seconds later a signal of a channel seizure
11
is sent and then, a mark
12
with 150 ms duration is sent. Finally the data message
13
including the data message of the caller-ID is sent. The next ring
14
is sent a few seconds later for the next cycle. The caller-ID is sent by utilizing a modularizing method of frequency shift keying (FSK) in which, for example, a frequency of 1200 Hz represents the logic state “1” and a frequency of 2200 Hz represents the logic state “0” and the sending rate is 1200 bits per second (bps). The signal of the channel seizure
11
is formed in a series of logic data mixed with a number of “0” and “1”. Following that, a signal of mark
12
is in a form of continuous logic state “1”. The first logic state “0” after the mark is interpreted as an end of the mark. Then the date, time and telephone number grouped as the information of the data message
13
are sent immediately after the mark
12
.
If the caller ID user also has voice mail and a call is received while in an on-hook state, the switchboard will send a message-waiting. The protocol for sending a message-waiting is arranged in a time sequence as illustrated in FIG.
2
. Referring to
FIG. 2
, the protocol starts with a channel seizure
21
having a duration of 250 ms, then a mark
22
and the data message
23
including the information of the message-waiting follows the channel seizure
21
sequentially.
In general, for a telephone having ability to process the caller-ID in an on-hook state, to save the power consumption, only the necessary parts of circuits are kept in a working mode such as the ring and the detecting circuits. Other parts of circuits are kept in a sleeping state. When the detecting circuits detect a ring, the circuits should activate all other related parts to process the caller-ID.
In the case that the user has applied the service of the voice mail box, since the message-waiting has no ring acting as the leading signal, the related parts to process the message-waiting need to be activated periodically to detect whether the signal of a channel seizure appears or not. If the signal of a channel seizure has been detected the circuit is kept in the working mode to process the incoming information.
The conventional method to process the caller-ID and the message-waiting utilizes a micro-controller to control the whole system, in which the micro-controller is always kept in working mode so that the micro-controller can sense the arrival of a ring and activate the related parts to process the caller-ID.
For the case to process the message-waiting, because there is no ring as the leading signal, the micro-controller has to activate the related parts for processing the message-waiting periodically to see if there is a signal of a channel seizure existing or not to decide if the related actions should be activated or not. This procedure can save the power consumption.
However the conventional receiving apparatus to process the caller-ID as described above has some problems as follows:
1. The micro-controller has to be always kept in the working mode to activate the related parts of circuits to detect a signal of a channel seizure. This causes the consumption of power and therefore causes the duration of use of the telephone to be reduced if the telephone is powered by battery.
2. Some specially designed software is needed to accommodate the micro-controller for being able to detect the ring and the channel seizure. This increases the complexity.
SUMMARY OF THE INVENTION
It is therefore an objective of the present invention to provide a caller-ID receiving apparatus preferably used in a telephone that can automatically detect the signal of a channel seizure and process a message-waiting.
It is another objective of the present invention to provide a caller-ID receiving apparatus not needing the micro-controller, in which the receiving apparatus can be made completely in a hardware circuit without the need of the software to fulfill the functions of detecting the signal of the channel seizure and processing the message-waiting. This gives the advantages that the complexity can be reduced and the fabricating cost can be brought down.
In accordance with the foregoing and other objectives of the present invention, a caller-ID receiving apparatus having the functions of being able to automatically detect the signal of the channel seizure and process the message-waiting includes: a timer, a wake-up circuit, an FSK detector & demodulator, and a data-recovery.
In the foregoing, the caller-ID receiving apparatus according to this present invention can further include a ring detector, which is coupled to the telephone wire. After a ring has been detected, the detecting circuit then sends a control signal to activate the wake-up circuit. Then the wake-up circuit activates the FSK detector & demodulator and other related parts to process the caller-ID, which has followed the ring.
Moreover, the wake-up circuit has another method for waking up. The method is to use a timer to generate a control signal to the wake-up circuit to activate all related parts and to detect if there is the signal of the channel seizure or not. If the channel seizure appears then the related parts continue the actions otherwise they return back to the sleeping state.
The FSK detector & demodulator, which is to detect an FSK signal coming through the telephone wire and decode the signal into a typical digitized signal, can be controlled by the wake-up circuit to decide whether to take action or not.
The data-recovery can receive the signal, which has been decoded by the FSK detector & demodulator, and detect the message-waiting, the mark and the caller-ID. When the return circuit is staying in the detecting the message-waiting state, if there is no signal of channel seizure detected in a certain limited time, the return circuit returns a signal to the wake-up circuit to set all related parts in a sleeping state to save the consumption of power.
In accordance with the forgoing objects, this invention of the receiving apparatus further comprises a lower-frequency clock and a frequency multiplier. The lower-frequency clock can provide the clock for the timer. Moreover, the lower-frequency clock can be transformed into a higher-frequency clock through the frequency multiplier
Eng George
Le Huyen
Thomas Kayden Horstemeyer & Risley
Winbond Electronics Corp.
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