JPH0430633A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To decrease a sense of displeasure given to the user by allowing a pager signal processing section of a slave set to prevent a sound of a succeeding pager signal from being sent from a cordless reception section when a bit synchronizing signal is detected from an output signal of a receiver. CONSTITUTION:A pager signal processing section 6 uses a demodulator 61 so as to convert a 1200Hz component to a digital signal of logical 1 and a 1800Hz to a digital signal of logical 0 and they are fed to a bit synchronization section 62. When the bit synchronization section 62 detects the synchronization of a reception signal, the bit synchronization section 62 sends a bit synchronization detection signal to a frame synchronization section 63 and a drive signal generating section 65. When the frame synchronization section 63 detects it that a prescribed bit number of pattern in succession to the bit synchronizing signal is coincident with the frame synchronization pattern, the frame synchronization section 63 sends a signal after the frame synchronization detection signal to a message end of call signal extraction section 64. Moreover, a drive signal generating section 65 sends a switch drive signal to turn off a switch SW thereby interrupting the connection between the receiver and a speaker 81. Thus, a sense of displeasure specific to a digital signal is not given to the user.

Description

[Detailed Description of the Invention] [Summary] For example, the purpose is to prevent users from hearing unpleasant sounds caused by pager signals received during a call on a cordless phone used in a company as much as possible. A master station having a transmitting means for transmitting a cordless audio signal using a designated wireless line and electric power, a receiving unit for extracting the cordless audio signal from the received signal, and a cordless wireless communication device driven by the cordless audio signal extracted from the receiving unit. In a cordless telephone system including a slave station that has an answering unit and a cordless telephone display unit and is connected to the master station via a wireless line, bit synchronization is performed while the master station is transmitting the cordless audio signal to the slave station. When a pager signal including a signal and a message is input, a pager signal superimposition part that superimposes the pager signal on the cordless audio signal or sends only the pager signal to the transmitting means transmits the pager signal to the slave station. Each pager signal processing unit is provided to process the
When the pager signal processing section detects the bit synchronization signal from the output signal of the reception section, the pager signal processing section uses the generated bit synchronization detection signal to cause the cordless receiver driven by the output signal of the reception section to receive the reception section. At the same time, the extracted message is displayed on the display section for the cordless telephone to convey the message to the user during the call.

[Industrial Application Field] The present invention relates to a cordless telephone system used within a company, for example.

In general, cordless telephones have a wide transmission band for transmitting voice signals, but the transmission band for pagers (wireless calls) is narrower than cordless telephones, so for the same transmission power, the latter is better than the former. The range of services will be expanded.

Therefore, by adding a pager function to cordless telephones used within companies (hereinafter referred to as system cordless telephones), system cordless telephones, which are originally narrow-band telephones, can be given wide-area coverage, and system cordless telephones can also be equipped with pager functions. Now you can request a call or send a message during a call.

At this time, it is necessary to prevent the user from hearing, as much as possible, the unpleasant sound peculiar to the digital signal caused by an incoming pager call during a call.

[Conventional technology]

FIG. 4 shows an example block diagram of a system cordless telephone.

In the figure, the base unit of the system cordless phone.

That is, a wireless base station (hereinafter abbreviated as BS) is provided for each wireless zone, and a plurality of system cordless phone handsets, that is, mobile stations (hereinafter abbreviated as PS), are provided.

Move within the wireless zone.

In addition, the radio network control station (hereinafter abbreviated as RCU) is PB
It is connected to the office line and each BS via X, and controls the wireless line.

Note that the channels of cordless telephones generally consist of a control channel (hereinafter abbreviated as C-CH) and a communication channel (hereinafter abbreviated as 5-CH).
When setting, select a 5-CH that is not used in the surrounding area.

Hereinafter, an example of the calling operation 9 and the receiving operation of the PS will be briefly explained using FIG. 4.

(1) Calling operation The PS searches for an unused 5-CH among the 5-CHs (this is called carrier sense), but when an unused 5-CH is found, it uses the C-CI ( 5-CH No.
.

It sends its own PS-No and a call request signal to the BS.

The BS checks whether the notified 5-CH is unused. When both the PS and BS confirm that 5-CH is unused, the BS sends PS-NO and received electric field information of the PS radio wave to the RCU.

The RCU compares call requests for the same PS number sent from multiple BSs using received electric field information, determines a suitable BS, sends a call relay command to this suitable BS, and sends a call relay command to the suitable BS.
Off-hook information is sent to X via the subscriber line corresponding to PS-No. Thereafter, the PS sends a dial signal, and the PBX connects the other party and starts a call.

(2) Incoming call operation The PBX sends a ring signal to the subscriber line corresponding to the PS where the incoming call was received. The RCU detects the ringer signal and transmits the PS-No. corresponding to the subscriber line, e.g. via all unused BSs.
, is sent on C-CH. PS is the number of unused 5-CH based on the incoming call response signal and carrier sense.

and the PS-No of its own station to the BS. From then on, the same operation as for making a call is performed.

Next, the operation between the BS and PS when a wireless line is established and a call is in progress will be described with reference to the block diagram of the conventional example shown in FIG.

First, the modulator II of the BS generates an FM wave using the input cordless audio signal, and the transmitter 12 converts it into a transmission signal of a specified frequency and sends it to the PS. Receiver 2 in PS
At step 2, a cordless audio signal is extracted from the received signal and the speaker 26 is driven.

The keyboard 24 in the PS is a part that generates the dialed number of the other party, and the cordless control unit 23 reads the dialed number from the keyboard, displays it on the display, and transmits it to the BS via the transmitter 2I.・When a call is received from a BS, a function to detect whether the number matches the dialed number of the own station. ・A function to control carrier sense and set the transmitter/receiver to the selected CI. Performs call control.

[Problem to be solved by the invention]

As mentioned above, system cordless phones do not have a pager function.

Therefore, in order to add a pager function to a system cordless telephone, a receiver 31, a pager signal detection section 329, a display section 34, and a pager signal detection section 329 as shown in FIG. 6(a) are required. Either a separate pager receiving section consisting of the buzzer 33 may be prepared, or the cordless audio signal and the pager signal may be band-divided and received by a common receiving section.

However, the former method requires a large increase in size and cost;
The latter method leads to quality deterioration.

Therefore, if the pager signal is superimposed on the cordless voice signal and sent to the slave station with the pager signal interrupted, the cost will increase and the form will be improved, but the incoming pager call during a cordless call will cause interference. Become.

That is, as shown in FIG. 6(b), the pager signal is composed of a bit synchronization signal of an alternating code of 1°0, a frame synchronization signal of a specific pattern, a message, and a call termination signal. s digital signal,
There is a problem in that this sound is played from the speaker during a call, causing the user to hear an unpleasant sound.

An object of the present invention is to prevent users from hearing unpleasant sounds caused by pager signals received during a call on a cordless telephone as much as possible.

[Means to solve problems]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, 4 is a transmitter that transmits the input cordless audio signal and pager signal using a designated wireless line and electric power, 5 is a receiving unit that extracts the cordless audio signal and pager signal from the received signal, and 8 is a transmitter that transmits the input cordless audio signal and pager signal. This is a cordless receiver driven by the cordless audio signal taken out from the receiver.

In addition, 7 is a cordless telephone display section that serves both as a cordless telephone display and a pager reception message display, and 9 is a cordless telephone display section that serves as a cordless telephone display and a pager reception message display, and 9 is a cordless telephone display section that displays when a pager signal including a bit synchronization signal and a message is input while the cordless audio signal is being sent to the slave station. At this time, a pager signal superimposing section superimposes the pager signal on the cordless audio signal or sends only the pager signal to the transmitting means, and 6 is a pager signal processing section that processes the pager signal.

When the pager signal processing section detects the bit synchronization signal from the output signal of the reception section, the pager signal processing section uses the generated bit synchronization detected signal to transmit the signal to the cordless receiver driven by the output signal of the reception section. is disconnected from the receiving section, and the extracted message is displayed on the cordless telephone display section to convey the message to the user during the call.

[Effect]

In the present invention, a pager signal is superimposed on a cordless audio signal from a master station and sent to a slave station.

When the pager signal processing section of the slave station detects the bit-period signal from the output signal of the receiver, it uses the generated bit synchronization detected signal to control the cordless receiver driven by the output signal of the receiver. It is separated from the receiving section so that the subsequent sound of the pager signal is not transmitted from the cordless receiving section.

Then, the extracted message is displayed on the cordless telephone display section, and the message received during the call is communicated to the user.

Incidentally, when a call end signal indicating the end of the pager signal is detected, the connection between the receiver and the cordless receiver is restored again.

Here, while the bit synchronization signal is being detected, the sound of the bit synchronization signal (for example, 1200 b/s) is transmitted from the cordless receiver, but the pattern of this signal is changed to a pattern with many audible low frequency components to provide the user with a sound. The discomfort caused can be reduced.

〔Example〕

FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a block diagram of a message signal processing section in FIG.

Here, the modulator 41. The transmitter 42 is a component of the transmitting means 4, the demodulator 61 . Bit synchronization part 62. Frame synchronization part 63. A message/end-of-call signal extraction section 64 and a drive signal generation section 65 are components of the pager signal processing section 6. Also, the same reference numerals indicate the same objects throughout the figures.

The operation shown in FIG. 2 will be explained below with reference to FIG.

First, in the modulator 41 of the master station, the input binary pager signal is passed through a low-pass filter (not shown), and then MSK
Modulate, for example l to 1200H2, 0 to 1800H2
to generate an MSK signal.

Then, after this MSN signal is superimposed on a cordless audio signal by a pager signal superimposition section (not shown) configured with a hybrid, for example, the carrier is converted into an FM signal using this superimposed signal.
In addition to the transmitter 42, the signal is transmitted to the slave station at a predetermined frequency and power.

The slave station receiver 51 extracts the MSN signal and the cordless audio signal from the received signal, and these signals are sent to the speaker 8I and the pager signal processing section 6 via the switch SW.
, so the speaker is driven by the superimposed signal. Therefore, a pager sound is heard superimposed on the cordless sound from the speaker to inform the user that a pager signal has been input.

On the other hand, the pager signal processing section uses a demodulator 61 to generate a frequency of 1200Hz.
The component is converted to 1 and 1800H2 is converted to a 0 digital signal and added to the bit synchronization part 62. When the bit synchronization section extracts the synchronization of the received signal, it sends a bit synchronization detected signal to the frame synchronization section 63 and the drive signal generation section 65.

The frame synchronization part 63 sends a message following the bit synchronization signal (when it detects that a pattern of a predetermined number of bits matches the frame synchronization pattern, the frame synchronization detection signal and subsequent parts are sent as messages).
It is sent to the end-of-call signal extraction section 64. Further, since the drive signal generation section 65 sends out a switch drive signal to turn off the switch SW and disconnect the receiver and the speaker 81, the user is not given the discomfort inherent to digital signals.

Now, the message/end call signal extraction section 64 extracts a message and displays it on the cordless telephone display section 7, but when the end call signal is extracted, it sends out an end of call detection signal to the drive signal generation section 65 and switches it. Turn off drive signal transmission.

As a result, the receiver 51 and the speaker are connected again, and the speaker is driven by the cordless audio signal.

Here, the bit synchronization pattern of the page signal is the 1010 alternating code as mentioned above, but this code has few audible low frequency components (there are many components of about 1200 Hz), so it may cause discomfort to the user. is high.

Therefore, by changing the pattern to, for example, 110110, the number of low frequency components increases, thereby reducing discomfort for the user.

In other words, it is possible to prevent the user from hearing the unpleasant sound caused by the pager signal received during a call using the cordless telephone.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to prevent the user from hearing the unpleasant sound caused by a pager signal received during a call on a cordless telephone as much as possible.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram of an embodiment of the invention, Fig. 3 is a block diagram of the pager signal processing unit in Fig. 2, and Fig. 4 is a block diagram of the system cordless telephone. Illustration, 5th
The figure shows a block diagram of a conventional example, and FIG. 6 shows an explanatory diagram of problems. In the figure, 4 is a transmitting means, 5 is a receiving section, 6 is a pager signal processing section, 7 is a cordless telephone display section, 8 is a cordless receiver section, and 9 is a pager signal superimposing section. Figure 4 Example of a cordless telephone.

Claims (1)

[Claims] 1. A master station having a transmitting means (4) for transmitting an input cordless audio signal using a specified wireless line and electric power, and a receiving section (5) for extracting the cordless audio signal from the received signal.
), a cordless receiver section (8) driven by the cordless audio signal taken out from the receiver section, and a cordless telephone display section (7), and a slave station connected to the master station via a wireless line. In a cordless telephone system including, when a pager signal including a bit synchronization signal and a message is input to the master station while transmitting the cordless voice signal to the slave station, the pager signal is superimposed on the cordless voice signal, or A pager signal superimposing section (9) for sending only the pager signal to the transmitting means is provided in the slave station, and a pager signal processing section (6) for processing the pager signal is provided in the slave station, and the pager signal processing section is connected to the receiving section. When the bit synchronization signal is detected from the output signal of the receiver, the generated bit synchronization detected signal is used to disconnect the cordless receiver driven by the output signal of the receiver from the receiver and extract the extracted message. A cordless telephone system characterized in that a message is conveyed to a user during a call by displaying on the cordless telephone display section. 2. A cordless telephone system characterized in that the bit synchronization signal according to claim 1 is configured in a pattern such that audible low frequency components are increased.