JPH07170574A - Connection control method and cordless telephone set using it - Google Patents

Abstract

PURPOSE:To reduce power consumption for a long time use of the telephone set and to exclude adverse effect on other equipment by sequentially increasing a transmission output from a low output till a link is set up between a master set connecting to a telephone line and a slave set executing the communication by the spread spectrum system. CONSTITUTION:An analog voice signal 110 received from a microphone 101 is given to a CODEC 103, in which the signal is converted into a digital signal 104. The signal 104 is given to a spread spectrum/inverse spread section 106, where spread spectrum modulation is implemented based on a command signal 112 from a control section 108 and a control section 115 is given to a variable amplifier 107. On the other hand, a control signal 113 from the control section 108 is given to a D/A converter 109, which converts the signal 113 into a DC voltage signal 114 used to decide a gain of the amplifier 107 and a transmission output level for the signal 115 is decided based thereon. A signal 105 received from an antenna 100 is subject to inverse spread modulation based on the signal 112 and the modulated signal is converted into an analog voice signal 111, which is outputted from a speaker 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone composed of a base unit connected to a telephone line and a handset unit which communicates with the base unit by a spread spectrum system.
More specifically, the present invention relates to a connection control method for selecting a transmission output according to a state without constantly monitoring a distance between a master unit / slave unit and a state of a wireless line, and a cordless telephone using the connection control method.

[0002]

2. Description of the Related Art In cordless telephones, a connection (establishment of a link) between a master unit and a slave unit is required when an event such as a call, an incoming call, or paging occurs. At this time, it is general that information such as an ID code is exchanged, and then the channel is connected. In addition, in a cordless telephone with an RF output voltage switching function, in order to ensure connectivity between the master unit / slave unit, a method of constantly monitoring the distance between the master unit / slave unit and the state of the wireless line, From the beginning, there was a method to call the other party with high output and quickly establish a link.

Further, in the "communication device" of Japanese Patent Laid-Open No. 4-261251, when a control signal is transmitted subsequent to the transmission of a voice signal, the control signal becomes noise with respect to the transmission of the voice signal. In order to suppress, the initial value of the amplification factor related to the modulation factor is transmitted as an amplification control signal that is set lower than the normal amplification factor, and if the amplification control signal is not confirmed on the receiving side, the amplification factor is increased stepwise to amplify. A wireless communication system configured to retransmit a control signal is disclosed.

[0004]

However, in order to secure the connectivity between the master unit and the slave unit as in the conventional cordless telephone, the distance between the master unit and the slave unit and the state of the wireless line are constantly monitored. In the method and in the method of calling the other party from the beginning with a high output and attempting to connect, the power consumption is heavy, and when the other party is called with a high output, communication between other devices existing in the surrounding There was a problem that it adversely affected.

Further, even in the "communication device" disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 4-261251, the transmission output, that is, the high frequency output is always constant only by changing the amplification factor relating to the modulation degree. Therefore, it does not solve the above problems at all.

The present invention has been made in view of the above,
Power consumption is increased as much as possible by gradually increasing the transmission output from the lower unit until the link is established between the base unit connected to the telephone line and the base unit that performs communication with the base unit by the spread spectrum method. The purpose is to suppress the use of the device for a long time and to prevent the communication between other devices existing in the vicinity from being adversely affected.

[0007]

In order to achieve the above object, the present invention provides a connection control method according to a first aspect of the present invention, which is a master unit connected to a telephone line, and a master unit and a spread spectrum system. With respect to the slave unit that executes communication, the transmission output is gradually increased from the lower side until the link is established.

In the connection control method according to the second aspect, a low level high frequency is output between the master unit connected to the telephone line and the slave unit that communicates with the master unit by the spread spectrum method. , It is judged whether or not there is a reception response to the transmission output, and if it is judged that there is a reception response, the link is established, and conversely, if it is judged that there is no reception response, there is a reception response. The transmission output of the high frequency is sequentially increased until it is determined that.

According to a third aspect of the present invention, there is provided a connection control method in a cordless telephone comprising a master unit connected to a telephone line and a slave unit which communicates with the master unit by a spread spectrum method. The device and the slave unit are spread spectrum modulation / demodulation means for performing modulation / demodulation processing for spread spectrum communication, transmission output varying means for varying the transmission output of the modulated signal modulated by the spread spectrum modulation / demodulation means, and whether or not there is a reception response. And a control means for controlling the transmission output varying means in accordance therewith.

Further, in the connection control method according to a fourth aspect, the transmission output varying means is composed of an amplifier, and the transmission output is varied by varying the gain of the amplifier according to the presence or absence of a reception response. .

Further, in the connection control method according to the fifth aspect, the control means controls the transmission output varying means to sequentially increase the transmission output from the lower side until the link is established.

[0012]

According to the connection control method (claim 1) of the present invention, the transmission output is low between the master unit connected to the telephone line and the slave unit that performs communication with the master unit by the spread spectrum method. From the other side until the link is established.

Further, the connection control method according to the present invention (claim 2) has a low level between the master unit connected to the telephone line and the slave unit which communicates with the master unit by the spread spectrum method. When a high frequency is output, it is determined whether or not there is a reception response to the transmission output, and when it is determined that there is a reception response, the link is established, and conversely, when it is determined that there is no reception response, The high-frequency transmission output is sequentially increased until it is determined that there is a reception response.

Further, a cordless telephone according to the present invention (claim 3) comprises a master unit connected to a telephone line and a slave unit which executes communication with the master unit by a spread spectrum system, and receives a reception response. The transmission output is controlled according to the presence or absence.

Further, in the cordless telephone according to the present invention (claim 4), the transmission output varying means is composed of an amplifier, and the transmission output is varied by varying the gain of the amplifier according to the presence or absence of the reception response.

Further, in the cordless telephone according to the present invention (claim 5), the control means controls the transmission output varying means to sequentially increase the transmission output from the lower one until the link is established.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a connection control method according to the present invention and a cordless telephone using the same will be described below with reference to the drawings. The cordless telephone described in this embodiment is composed of a master unit connected to a telephone line and a slave unit that executes communication with the master unit by a spread spectrum method. Here, the spread spectrum method is a method of converting an information signal into a signal having a wider bandwidth than the inherent bandwidth (spectrum width) of the information signal and transmitting the information signal. This is a method for realizing a communication system with excellent signal confidentiality.

FIG. 1 is a block diagram showing the construction of a cordless telephone handset according to the present invention. In FIG.
0 is an antenna for transmitting / receiving signals, 101 is a microphone for inputting voice, 102 is a speaker for outputting voice, 1
03 is a CODEC for converting an analog (digital) audio signal into a digital (analog) audio signal, and 104 is a COD
Digital audio signal converted by EC 103, 105
Is a digital audio signal input to the CODEC 120.

Reference numeral 106 denotes a spread spectrum / despreading section for performing spectrum spread modulation or spectrum despread modulation on the digital audio signal converted by the CODEC 103, and 107 has been modulated by the spread spectrum / despread section 106. A variable amplifier (for example, an RF driver) capable of amplifying an output / input level of a modulated signal or a reception signal input through the antenna 100 and varying the gain thereof, 108 is a control unit for integrally controlling each unit of the slave unit. , 109 is a D / A converter for converting a digital control signal from the control unit 108 into a DC voltage which is an analog signal used for setting the gain of the variable amplifier 107, 110 is an analog audio signal input from the microphone 101, and 111 is Analog voice signal output to the speaker 102 It is.

Further, 112 is a command signal output from the control unit 108 to the spread spectrum / despreading unit 106 (in this command, for example, various parameters such as a spreading pattern and a burst for link establishment are generated. , 113 is a control signal output from the control unit 108 to the D / A converter 109, and 114 is D / A.
It is a DC voltage signal for gain setting (for example, controlling the power supply voltage of the RF driver stage) output from the A converter 109 to the variable amplifier 107.

Reference numeral 115 denotes a modulation signal output from the spread spectrum / despreading unit 106 to the variable amplifier 107 (the modulation signal here is a signal scrambled by an extended pattern, and data of various commands). ，
Voice data is included), and 116 is a variable amplifier 107.
From the spread spectrum / despreading unit 106 from the received signal in a state where despreading is not performed, 117
Is from the spread spectrum / despreading section 106 to the control section 108.
Spread spectrum / despreading section 106 output to
Is a status signal indicating the state of and the command signal transmitted from the master unit.

Next, the operation will be described. Microphone 10
The analog audio signal 110 input from 1 is CODE
It is input to C103 and converted into a digital audio signal 104. Then, the digital audio signal 104 is input to the spread spectrum / inverse spread unit 106, spread spectrum modulation is executed based on the command signal 112 from the control unit 108, and the modulated signal 115 is input to the variable amplifier 107. On the other hand, the control signal 113 from the control unit 108 is D
Input to the A / A converter 109 and the variable amplifier 10
DC voltage signal 11 for gain setting for setting gain of 7
4 and is input to the variable amplifier 107. The variable amplifier 107 based on the input DC voltage signal 114.
Is set, and the high frequency voltage (transmission output) level of the modulation signal 115 is determined based on the set gain.

On the contrary, the signal received via the antenna 100 is amplified by the variable amplifier 107, input as the received signal 116 to the spread spectrum / inverse spread section 106, and based on the command signal 112 from the control section 108. Spread spectrum spread spectrum modulation is performed. The digital audio signal 105 after the spectrum despreading modulation process is CO
After being input to the DEC 103 and converted into an analog audio signal 111 by the CODEC 103, the speaker 102
Is output via.

FIG. 2 is a block diagram showing the configuration of the master unit. The same components as those of the slave unit shown in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. , Only the parts different from the configuration of the slave unit will be described.
In the figure, reference numeral 200 is a telephone line, 201 is a telephone line interface circuit for connecting the main unit and the telephone line 200, 2
Reference numeral 02 is a transmission sound and 203 is a reception sound.

Next, the operation will be described. Telephone line 2
The telephone interface circuit 201 separates the signal from 00 from the transmitted sound 202 and the received sound 203, and the control unit 108 controls the telephone interface circuit 201 to control the signal between the telephone line 200 and the master unit. To execute. The other operations are the same as the operations of the child device, and thus the description thereof is omitted.

Next, the connection control method, which is a feature of the present invention, between the master unit connected to the telephone line and the slave unit that performs communication with the master unit by the spread spectrum method will be described in detail. FIG. 3 is a flowchart showing the operation. First, when an event occurs, the control unit 10
8 is a control signal 113 for the D / A converter 109.
To set the transmission output to a small power (S301),
The D / A converter 109 generates an analog gain setting DC voltage signal 114 according to the control signal 113 (S302).

Next, the control unit 108 outputs the command signal 112 for connection to the spread spectrum / inverse spread unit 106 (S303), and receives the command signal 117 related to the connection code of the spread spectrum pattern (S3).
04), it is determined whether or not there is a reception response from the received command signal 117 (S305). As a result, if it is determined that there is a reception response, the link is established (S307). On the contrary, if it is determined that there is no reception response, the control signal 113 is set to increase the output (S30
6) Return to the process of step S302, and thereafter, it is determined that there is a reception response, and the processes of steps S302 to S306 are repeated until the link is established.

As described above, the transmission output between the master unit connected to the telephone line and the slave unit that communicates with the master unit by the spread spectrum method is gradually increased from the lower one until the connection is established. Since it is controlled by
Since it is not necessary to monitor the distance between the slaves and the state of the wireless line, and the transmission output can be selected according to the state, the power consumption can be suppressed as much as possible and the device can be used for a long time, In addition, it is possible to eliminate adverse effects on surrounding communication devices.

That is, the ID authentication and the transmission of the function code, etc. are executed at the time of connection between the master unit and the slave unit, but at this time, the control is performed such that the transmission output is increased in sequence (from cycle to cycle) from the lower one until the link is established. As a result of executing, the minimum output required for communication between the master / slave can be easily confirmed.

Further, if the distance between the master unit and the slave unit is long, connection cannot be established unless the output is increased. Therefore,
There is a time lag for connection, but the bell sound of the master unit (or the telephone connected to the master unit) cannot be heard by the person carrying the slave unit until the link is established. The above-mentioned time lag does not cause any problems for users who are currently using it. On the other hand, when the distance between the master unit and the slave unit is short, the connection is possible even in the low output state, so that the problem of the time lag described above does not occur at all. The connection control method in the above-described embodiment is particularly effective in the direct sequence spread spectrum communication in which the transmission output is relatively large.

Further, although the above embodiment has been described by taking a cordless telephone as an example, the application of the present invention is not limited to a cordless telephone, and if it is a device of a mobile radio communication system, for example, a cellular car telephone or the like. Can also be applied to.

[0032]

As described above, in the connection control method according to the present invention and the cordless telephone using the connection control method, the master unit connected to the telephone line and the master unit are communicated by the spread spectrum method. Between the child machine that executes
Since the transmission output is increased from the lower side until the link is established, the power consumption is suppressed as much as possible, the device can be used for a long time, and the adverse effect on the communication between other devices existing in the vicinity can be eliminated. .

Further, in the connection control method and the cordless telephone using the same according to the present invention, the master unit connected to the telephone line and the slave unit that performs communication with the master unit by the spread spectrum method. In between, it outputs a high frequency of low level and judges whether or not there is a reception response to the transmission output. If it is judged that there is a reception response, the link is established, and conversely, there is no reception response. If so, the high-frequency voltage output is sequentially increased until it is determined that there is a reception response, so the minimum output required for communication between the master unit and the slave unit can be easily confirmed.

Further, in the cordless telephone according to the present invention, the transmission output varying means is constituted by an amplifier, and the transmission output is varied by varying the gain of the amplifier according to the presence / absence of a reception response. It is simple and can reduce the manufacturing cost.

Further, in the cordless telephone according to the present invention, the control means controls the transmission output varying means so that the communication from the lower transmission output is connected to the communication.
As the bell sound of the base unit (or the telephone connected to the base unit) is not heard until the link is established by the person carrying the handset, the user who carries the handset There is no hindrance to the time lag until the link is established.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a slave unit of a cordless telephone according to the present invention.

FIG. 2 is a block diagram showing a configuration of a base unit of the cordless telephone according to the present invention.

FIG. 3 is a flowchart showing the operation of the connection control method according to the present invention.

[Explanation of symbols]

 103 CODEC 106 Spread Spectrum / Despreading Unit 107 Variable Amplifier 108 Control Unit 109 D / A Converter 200 Telephone Line 201 Telephone Line Interface Circuit

Claims (5)

[Claims] 1. The transmission output between a base unit connected to a telephone line and a base unit that communicates with the base unit by a spread spectrum method is gradually increased from the lower side until a link is established. A characteristic connection control method. 2. A low level high frequency is output between a base unit connected to a telephone line and a base unit that performs communication with the base unit by a spread spectrum method, and a reception response to the transmission output is received. If it is determined that there is a reception response, the link is established. On the contrary, if it is determined that there is no reception response, the high-frequency transmission output is output until a reception response is determined. A connection control method characterized in that the connection is raised sequentially. 3. A cordless telephone comprising a master unit connected to a telephone line and a slave unit that performs communication with the master unit by a spread spectrum system, wherein the master unit and the slave unit are in spread spectrum communication. Spread spectrum modulation / demodulation means for performing modulation / demodulation processing, transmission output varying means for varying the transmission output of the modulated signal modulated by the spread spectrum modulation / demodulation means, and controlling the transmission output varying means depending on the presence or absence of a reception response. A cordless telephone comprising a control means. 4. The cordless telephone according to claim 3, wherein the transmission output varying means is composed of an amplifier, and the transmission output is varied by varying the gain of the amplifier according to the presence or absence of a reception response. 5. The cordless telephone according to claim 3, wherein the control means controls the transmission output varying means to sequentially increase the transmission output from the lower side until the link is established.