JPS6174427A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To simplify the transmission circuit of a slave station and to improve the error detection capability by modulating a pilot signal transmitted from a slave station to a master station with a transmission code of a frame architecture added with an error detection code so as to form the said pilot signal. CONSTITUTION:An operation control circuit 20 of a slave station operates arithmetically dial information in terms of a binary signal and adds a transmission code of frame architecture with the error detection code corresponding to the dial information to a pilot modulation circuit 22. Then the pilot signal from a pilot generating circuit 21 is modulated by using an output of the circuit 20, its output is added (24) with a voice input signal of a microphone 8 and the result is transmitted to a modulation circuit 25. The circuit 25 modulates the output of the adder circuit 24 with a carrier of a prescribed frequency and its output is transmitted to a master station via a transmission circuit 26 and an antenna 3. On the other hand, this radio signal is received and decoded at the master station side. Then the dial information at the slave station is dialed through a telephone line.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention comprises a master station equipped with a wireless transmitter/receiver i and connected to a single talk line, and a slave station wirelessly connected to the master station. Related to cordless telephones, in particular transmission methods for dialing information wirelessly transmitted from a slave station to a master station (b) Conventional technology - When making a call by dialing from a slave station of a dress telephone to a telephone line, the published patent publication Showa 58-40939 (
As stated in the specification of HO4B7/24), the slave station generates a dialing signal corresponding to the desired telephone number,
The dial signal is used to modulate the pilot signal and send it to the master station. The master station sends the dial signal sent from the slave station to the telephone line and connects to the telephone line, but this configuration is because cordless telephones are common, and only the slave station can connect to the telephone line. .

It would be convenient if the master station and the slave station could each make a dial call to the telephone line, but in the conventional system, the new station and the slave station must each have a means for generating a dial signal, which is uneconomical. In addition, as a dial dialing method,
There are two types of dialing, one using dial pulses and one using multi-frequency signals, and it would be more convenient if both of these methods could be used to make dial calls from the master station and slave stations.

(c) Problems to be Solved by the Invention In view of the above-mentioned problems, the present invention provides an economically efficient cordless telephone that can make dial calls from a master station and a slave station.

2) Means for solving the problem For this reason, the uninvented invention provides a dialing means in the master station, and when transmitting dialing information from the slave station to the master station wirelessly, dials a pilot signal to be sent from the slave station to the master station. This dial information is modulated with a transmission code having a frame structure with an error detection code attached corresponding to the information, and then sent to the master station. The master station detects an error in the transmission code and, if there is no data error, makes a dial call in response to the dial information from the slave station, thereby providing a cordless telephone that eliminates the above-mentioned uneconomical effects.

The object of the present invention is to provide an apparatus in which the burden of arithmetic processing for generating and checking the transmission code is particularly small, and therefore the circuits of the master station and slave stations can be constructed economically.

(e) Examples Next, the present invention will be explained based on examples and with drawings.

Figure 1 is a diagram of a slave station (1) and a block diagram of an unimplemented cordless telephone, Figure 3 is a block diagram of the main parts of the master station, and Figure 4 is an example of the configuration of a transmission code sent from the slave station to the master station. be.

In Figure 1, (1) is a slave station, an antenna for wireless transmission and reception (31, a speaker (41), a keyboard (51,
It is equipped with an automatic dial key (6), a selection key (7) for dialing formats of pulse dial and tone dial, a microphone (8), and an operation switch (9). When the operation selector switch (9) is in the OFF position on the left side as shown in the figure, it is in the standby state, and the ring tone from the telephone line is transmitted wirelessly from the antenna (1G) of the master station (2), and is transmitted to the antenna of the slave station. (3), and the speaker (4).
will be converted into a ringtone. At this time, by sliding the operation changeover switch f91 to the ON position on the right side, a call can be made via the master station. When the call ends, the operation selector switch (
9) to the OFF position on the left side will return to the standby state. When receiving a call from a slave station, press the operation switch (9) to 0NVcl, then press the dial number using the keyboard (5). The corresponding dialing information will be sent to the master station, and the master station will receive this dialing information. Based on the information, a call can be made by sending a dial message Jij to the telephone line.

(2) is the master station, antenna αB for wireless transmission and reception with slave stations, automatic dial key ■, display 0, keyboard α3
, a selection key I for dialing formats of pulse dial and tone dial, and a handset αS.

In this embodiment, all dial speech formats can be selected using the slide switch on the slave station and the keys on the master station.
This is because the slave station does not have a display, so the switching can be visually confirmed by the position of the slide switch, and the master station can select the dialing format using the display port. .

The master station (2) detects an incoming call from the telephone line, emits a ringtone, and wirelessly transmits this ringtone to the slave station (1).

When the operation changeover switch (9) of the slave station (1) is set to 0NIC, a pilot signal is sent from the slave station to the master station, and the master station detects this and connects the telephone line and the slave station wirelessly. When a call is received, the handset αS is lifted and a hook switch (not shown) is closed, the telephone line is connected to the master station, and a conversation can be made using the handset □□□.

For a call from the master station, after lifting the handset αSt and closing the hook switch, if a dial number is pressed on the keyboard ■, a corresponding dialing signal is sent to the telephone line, and a call can be made. At that time, dial information such as a dial number is displayed on the display 03.

The present embodiment also has an automatic dialing function, and by pressing keys 1 to 8 of the automatic dialing key 1, a dial call can be made based on preset telephone information corresponding to the pressed number. In this embodiment, the number of stored telephone numbers that can be automatically dialed (referred to as the number of automatic dial stations under 9i) is 8, and the automatic dial key α11 has 8 keys. The number of automatically dialed stations may be increased by increasing the number to 52 or 64.

Note that the space to the right of the automatic dial key is a space for writing the set telephone number, etc. In addition, this automatic dialing function is equipped with an automatic dialing key (6) on the master station that can specify a number from 1 to 4 so that it can be operated from a slave station. Then,
The information corresponding to this automatic dialing (hereinafter also referred to as telephone information) is sent to all master stations, and the master station automatically dials in response to this information to connect the line with the slave station (one-touch dial function). Furthermore, since it is desirable for the slave station to have a portable structure and small external dimensions, such an automatic dial key (6
) It is inconvenient to arrange a large number of keys, so in this embodiment, the (arrow) key of the keyboard (5) and the number keys 0 to 9 are arranged in two
By pressing the button multiple times, you can specify a number to be automatically dialed (speed dial function). The operation using this speed dial function is (%) when the number of automatic dialing stations is 8.
Press +71, and if the number of automatic dialing stations is 10 or more, press (arrow) to + (71) and keyboard (5) to specify the automatic dialing station +73ft of the master station from the slave station.

Next, a circuit configuration for realizing the operation of this embodiment will be explained based on FIG. 1g2 and FIG. 3. From the slave station to the master station, the audio signal and modulated pilot signal are AM or iFM modulated by a predetermined carrier wave in the modulation circuit @, amplified in the transmission circuit (to), and wirelessly transmitted via the wireless transmission/reception antenna (3). This audio signal is band-limited between 200Hz and 3.4KHz, and the modulated pilot signal is a pilot signal with a frequency different from this audio band (for example, 6ECHz) that is modulated by a pilot modulation circuit. Yes, and does not overlap with the audio signal band.

Modulated pilot signal 8Fi, ta sent from this slave station to the master station
J To notify the master station that the slave station is being operated, including modulation and non-modulation cases (generally, the master station off-hook the telephone line OD in response to this operation).

tbl Used to send dial information from the slave station to the master station.

Regarding the transmission of this dial information, for example, if the keyboard (key 51 11' is operated, the number 11
Corresponding to the information (dial information), the arithmetic and control circuit generates a transmission code, and based on this transmission code, the pilot modulation circuit modifies the pilot signal (the modulation form is tone burst, FSK, etc.). The modulated pilot signal (ie, modulated pilot signal) is transmitted to the master station.

In FIG.
), automatic dial key (6), selection key (71), and changeover switch (9) (both not shown), the pilot signal generation circuit (2), pilot modulation circuit (2), and transmission output circuit (4) are controlled.

An example is a summing circuit where the output of a pilot modulator and
The audio signal detected by the microphone (8) and amplified by the microphone amplifier is added and supplied to the modulation circuit (5). The modulation circuit (c) modulates the output of the adder circuit with a carrier wave of a predetermined frequency, amplifies this modulated wave in a full transmission circuit (branch), and wirelessly transmits it to the master station via the wireless transmission/reception antenna (3). On the other hand, the radio waves sent from the master station are received by the all-wireless transmitting/receiving antenna (3) and amplified by the high frequency amplification circuit. c! 8
is an audio detection circuit that detects an audio signal from the received and amplified RF signal.The detected audio signal is amplified by an amplification circuit, and the audio is reproduced by a speaker (41).

With the configuration shown in Figure 2, when the slave station's keyboard (5) or automatic dial key (6) (shown in Figure 1) is pressed,
The arithmetic control circuit ■ generates a transmission code corresponding to the pressed dial information, and based on this, the pilot sends Ji!
r is modulated and wirelessly transmitted to the master station.

The audio signal detected by the microphone (8) is transmitted to the master station together with the pilot signal, and the audio signal sent from the master station is detected and the audio is reproduced by the speaker (4).

In Fig. 3, 01 is an arithmetic control circuit composed of a microcomputer, a memory circuit, etc., and this circuit (■) corresponds to each key of an automatic dialing key (111 (not shown)) and displays dialing information such as a telephone number. Set or
When this automatic dialing key I is pressed, dialing means (in the embodiment, a line relay (to) (to) and a multi-frequency signal generation circuit (to) and a multi-frequency signal generation circuit (
7)], and control dialing and connection to the telephone line based on the operation of the keyboard (13), hook switch ring, and changeover key (14 (not shown).When dialing from the master station, the display Displays information such as the dial number on the device (12).The arithmetic discrimination circuit cn#i also makes a dial call based on the dial information sent from the slave station.
The control unit connects the telephone line 61) and the slave station wirelessly.

As mentioned above, (a) and (g) are line relays, (to) are relay contact circuits, and (to) are relay drive circuits. The relay drive circuit (to) is controlled by the arithmetic control circuit ω for on-hook and off-footer and for sending dial pulses. 04 is an adder circuit that adds the multifrequency signal generated by the multifrequency signal generating circuit (to) and the audio signal input via the relay circuit @. This output is sent to the telephone line c3D via a relay circuit (to). In the example shown in Fig. 1, the configuration is such that dialing can be made using either pulse dial or tone dial format. Time is multi-frequency signal generation circuit (7)
control.

(to) @@Fi parent/child station switching relay, arithmetic control circuit O
11 controls the relay drive circuit OI to switch the connection between the telephone line C(1) and the master station or slave station. Relay circuit (G)
Contrary to what is shown in the diagram, if the contacts between (0 and 1) are closed, the master station and the telephone line (to) are connected.

In this case, a voice call from the telephone line (b)! The sound is amplified by the amplification circuit c via the connection A (c-'b) of the ViIJ relay circuit (to), and is reproduced by the speaker of the handset.

In addition, the audio signal detected by the microphone loop on the handset is amplified by the microphone amplifier i, and is sent to the line via the relay circuit contact (Cb), the adder circuit (to), and the relay circuit (to). You can make calls using the base station's handset.

Next, relay contacts (a-a) of relay circuits (1) and (9)
A case will be described in which the telephone line (b) is closed as shown in the figure, and the telephone line (b) and the slave station are connected. On is an incoming signal generation circuit whose generation is controlled by the arithmetic control circuit (2).

This incoming signal and the audio signal from the telephone line are combined into an adder circuit (
(g), modulated with a carrier wave of a predetermined frequency by the modulation circuit, amplified by the transmission circuit, and wirelessly transmitted from antenna 01 for wireless transmission and reception to the slave station. Radio waves sent from the slave station are wireless. The signal is received by the transmitting/receiving antenna αC and amplified by the high frequency intermediate circuit (2). (G) is an audio detection circuit that detects an audio signal from the received and amplified R'F signal, and is composed of a bandpass filter and the like, and its output is output from the middle circuit (
It is amplified by (b) and sent to telephone line C (η).

(Incorporated) is a detection circuit for modulated pilot signals, and is a bandpass detection circuit that corresponds to the frequency band of this modulated pilot signal.
It consists of filters, etc., and detects the modulated pilot signal sent from the slave station. - is a code decoding circuit which reproduces a binary signal corresponding to a transmission code which is a pilot signal of a slave station.

When the pilot signal of the slave station is modulated by tone burst, the envelope of the detected modulated pilot signal may be made into a binary signal. The binary signal corresponding to this transmission code is input to the arithmetic and control circuit ■, where it is checked for the presence or absence of the transmission code and modulated pilot signal from the slave station, and the connection between the slave station and the telephone line or the dialing to the 1-talk line is performed. Outgoing calls are controlled.

Although not shown, the calculation sub-circuit ■ is connected to the telephone line (
3)) and wirelessly transmits a separately set ringtone. In this embodiment, two dial dialing formats, pulse dialing and tone dialing, can be selected from both the master station and the slave station. As a setting means for this selection, the master station presses the selection key 0 and 1. The reason why the selection switch (7) such as a slide switch is used in the slave station is that the master station has a display α2, and it is sufficient to display the selection status of the dialing format on this, and the slave station does not have a display means. This is because it is necessary to visually confirm the position of the switch.

With the configurations of the slave station and the master station in FIGS. 2 and 3 described above, the function of receiving calls from the telephone line-g31) and the function of receiving calls from the master station and the slave stations are realized.

Next, the code structure of the dial information sent from the slave station to the master station will be described.

In this embodiment, the dialing information consists of numeric information from 0 to 9, dialing format selection information (P or T), and 15 types of information corresponding to the (at) key during automatic dialing, and the binary code 4. It can be composed of Bift (A1, A1, A1, A4). Although either A1 or A4 may be the MSB (most significant bit), for convenience, A1 is assumed to be the MSB.

When sending this binary code to the master station, it is necessary to know the start timing of the data bit of the code received by the master station.

Generally, this is the same expectation for the frame Ji! r is added and the code is sent.

Additionally, an error detection code is also added to the frame structure to prevent the master station from receiving incorrect dial information due to deterioration of the radio wave environment from the slave station to the master station.

The pilot signal is modulated with the transmission code of this frame structure and the dial information is sent.The present invention makes it easy for the arithmetic sub-section circuit of the slave station and the master station to create and inspect this transmission code. It is configured as follows. An example of the structure of this transmission code will be explained with reference to FIG.

'WS4 Figure 1dJF-1 shows the timing pulse of this data bit separation. Figure 4 tal shows the leading bits consisting of 5 bits of logic 11' and 1 bit of logic 10', a binary code representing the dial information of (AI, A2, A1, A4), and the binary code of this inversion. (A,,A1,A
.

A4) constitutes the transmission code. Since the maximum number of consecutive logic 11's is Fi4 in the part excluding this leading bit, 5, which is one larger than this number, is selected as the leading bit's logic 11'. This is because even if the transmission code with the configuration of ta+ in the figure is sent continuously, the timing of frame synchronization can be easily determined by counting the logical ``1'' five times and then using the subsequent logical addition. .

Also, error detection is performed using (AI, Al4 A
mA4) and continuation <(A1, A,, As, A, )
All you have to do is invert the logic and compare. At this time, if an error is detected, the dialing operation will not be made to prevent incorrect dialing operations. As shown in the figure, after the preceding bit, the fourth opening is the binary code (Ar%A2, A1, A4) of the dial information.
3i, divided into two parts (At, A, ) and (As, , An), and the divided contents and their inversions are sequentially arranged. In this case as well, the maximum number 4 continues with logic 11' except for the leading bits [however, this is (A1, Ak
A,, A4. ) is (0, 0, 1, 1)], so the leading bit F is the same as in the case of Figure 1al.
It can be composed of i(1, 1, 1, 1, 1, 0).

IgA diagram tc+ Each bit of the binary code of Fi dial information and its inversion are paired and arranged sequentially after the preceding bit, where the maximum number t'i2 in which logic 51' continues.
The leading bits are configured as (1, 1, 1, 0). $4 If configured as shown in Figure (C), the leading bit length can be minimized, and therefore the bit length of the transmission code can be shortened compared to the (-) case, so the time for sending and receiving dial information can be shortened. .

In the explanation so far, the state in which the slave station is being operated, that is,
When the operation selector switch (9) is set to 0NVC,
In order to transmit this status to the master station, the arithmetic control circuit drives the pilot signal generation circuit, and generates the pilot signal 'j).
(including the f-key pilot signal) was set as the number of tanks to be transmitted to the master station, but the strength of the radio waves received by the master station may vary significantly due to changes in the distance between parent and child i, and this state of the slave station is preferably transmitted together with the transmission code. In this case, if the slave station has a pilot, it is sent to the master station as logic 11' or logic '0' together with the transmission code. Figure 4 t
el shows the time chart of the control input (output from the arithmetic control circuit) of the pilot modulation circuit (2) of the slave station.

However, the time axis #i of Figure 4 tel Figure 4 + al ~ tct
Those with + are compressed and written.

When the slave station operation changeover switch (9) is turned on at the timing of (T,), the logic becomes '1', and the transition from (T!) to (
T,) and Fi at the timing from (T4) to (T,)
Depending on the logic level according to the above-mentioned transmission code, when the operation changeover switch (9) of the slave station is turned off, a logic addition occurs. If the pilot signal is modulated at the logic level shown in FIG. The presence or absence of information and pilot signals can be determined.

(f) Effects of the Invention As described above, according to the configuration of the present invention, it is possible to completely eliminate the dialing circuit means of the slave station of a cordless telephone that can dial from the master station and the slave station, thereby providing an economically efficient cordless telephone. It will be done. In addition, in order to provide false 9 detection capability in the transmission of dial information, and to prevent false dial operations from occurring due to electromagnetic interference, etc., an error detection code is added to the transmission code, but the configuration of the present invention is incorrect. The detection code has extremely simple arithmetic processing when encoding and decoding, and therefore does not require a new processing circuit for encoding and decoding, and can be used for arithmetic control that can be used for dial operations on the master station and slave stations. Since the means does not require high performance computing power, such arithmetic control means can be constructed economically.

[Brief explanation of the drawing]

FIG. 1 shows a cordless telephone according to the present invention;
2 is a perspective view showing the slave station, tl)l is a perspective view of the master station, FIG. , FIG. 4 is a diagram showing the transmission code used in the present invention. (3)...Antenna, (4)...Speaker, (5)
...Keyboard, (6) ...Auto dial key, (
7)...Selection switch, (8)...Microphone, (9)...Operation changeover switch, α0...Antenna, ■...Auto dial key, ■...Indicator, 0 to... Keyboard, α0...selection key, QSI...handset, ■...arithmetic control circuit, Corporation...pilot signal generation circuit, ■...pilot modulation circuit, device...
Microphone amplifier, (to)...addition circuit, device...modulation circuit, ■...transmission circuit, Ω...high frequency amplification circuit, ■・
...Audio detection circuit, ■...Amplification circuit,
, ■...Arithmetic control circuit, 0η...Telephone line, (32,33)...Line relay, (B) (B)...
・Addition circuit, (7)...Multi-frequency signal generation circuit, (to)
@(To) --- Parent-child station switching relay, (1)... Le service layer drawing signal generation circuit, 0D (B)... Width expansion circuit, □□
□...Speaker, (Foundation)...Modulation circuit, ■...Transmission circuit, ■...High frequency amplification circuit, -...Audio detection circuit, (Foundation)...Pilot detection circuit, )...:I
− decoding circuit, ω・−・microphone, circle: microphone amplifier, jump: foot switch.

Claims (3)

[Claims] (1) In a cordless telephone comprising a master station connected to a telephone line and a slave station wirelessly coupled to the master station, the master station includes (a) arithmetic control means; (b) the arithmetic control means; (c) code decoding means for receiving a pilot signal sent from a slave station and decoding a transmission code from the slave station; and (d) transmitting dialing information to the slave station by transmitting a transmission code. (e) pilot signal modulation means that modulates a pilot signal with the transmission code, and includes inverted data bits for the dial information formed of the N-bit binary information. M bits (however, N<M
<2N) leading bits, N bits of dial information, and N bits of error detection bits obtained by inverting the data of the N bits of dial information to form the transmission code, and the pilot signal modulated with the transmission code is transmitted to the master station. A cordless telephone that transmits wirelessly to the telephone line and dials the telephone line according to the dialing information at the master station. (2) The transmission code is formed by dividing the dial information into a plurality of sections and sequentially arranging the M-bit leading bits, the dial information of the divided sections, and their inverted data. Cordless telephone set according to item 1. (3) The cordless telephone according to claim 2, wherein the preceding bit length M is a bit length that is more than twice the length of the divided section.