JP2002051380A - Digital cordless telephone device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable high-speed modem signals to be communicated correctly between a mobile station and a base station, without garbled data in a PHS. SOLUTION: Analog modem signals, inputted through a telephone circuit, are coded into digital signals by a 14 or 16-bit linear CODEC, the coded 14-bit (or 16-bit obtained by adding two bits) or 16-bit digital signals are divided into channel data which are 4 bit each, and the digital signals are sent to slave mobile stations through the four different channels (channel 1, channel 2, channel 3, and channel 4) on radio transmission. The slave mobile station integrates the coded data, which are divided into the four channel data that are 4 bit each, into the coded data of 14 or 16 bit, and then converts them into analog modem signals through a data decoding process by a 14 or 16-bit linear CODEC. Using such a setup, since analog modem signals are sent or received without being subjected to a data compression process by the use of ADPCM, the data are never spoiled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone apparatus using a telephone line network such as an analog telephone line or an ISDN line, and more particularly, to a digital cordless telephone capable of correctly communicating a modem signal such as a facsimile or a personal computer by radio. Telephone equipment.

[0002]

2. Description of the Related Art A fixed base station (hereinafter referred to as a master) connected to a telephone line network and a mobile station (hereinafter referred to as a slave) connected to the master via digital radio communication of up to four channels. In a digital cordless telephone device of a parent device and a child device used in a personal handy phone system (PHS) composed of: a parent device (or a child device), an ADPCM
An analog signal to be transmitted is sampled at a period of 8 kHz by a voice encoding method called (Adaptive Differential PCM), code-compressed into 4-bit digital data, and transmitted to a slave unit (or a master unit) by digital wireless transmission. In the slave unit (or master unit) on the receiving side, the received digital data (ADPCM data) is decoded and expanded to the original analog signal. In the prior art described in Japanese Patent Application Laid-Open No. H11-136768, ADP
Instead of adopting the CM system, digital data transmitted and received between the parent device and the child device is performed using a PCM (Palse Code Modulation) code.

[0003]

In the above-mentioned conventional digital cordless telephone device, the analog voice signal is transmitted to A
An analog signal to be transmitted must be 9 in order to perform radio communication by performing voice compression using a voice coding method called DPCM.
In the case of a modem signal exceeding 600 bps, if the encoding / decoding process is performed by ADPCM, there is a problem that the modem signal is not correctly decoded and data is partially divided.

When an analog voice signal is wirelessly communicated by a voice coding method called PCM, if the analog signal to be transmitted is a modem signal exceeding 28.8 kbps, if the encoding / decoding process is performed by PCM, the There is a problem that a signal is not decoded correctly and data is partially fragmented.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and does not compress an analog signal by ADPCM audio coding processing, nor encodes an analog signal by PCM audio coding processing. Perform wireless communication by processing, 9
An object of the present invention is to provide an excellent digital cordless telephone device capable of correctly performing wireless communication even with a modem signal exceeding 600 bps or 28.8 kbps.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital cordless telephone apparatus for transmitting and receiving analog modem signals between a transmitting side and a receiving side of a personal handy phone system (PHS). Digital encoding means for encoding the analog modem signal into a digital signal in N × M (N, M: positive integer) bit units, and a data division for dividing the N × M bits into N units of M bits from the most significant bit Means and said top M
The bit data is stored as K × M (K: positive integer) bits to be the data of channel 1, and the data of each M bit is sequentially stored by K × M bits to be the data of one channel. Channel frame assembling means for accumulating K × M bits of data of M bits to assemble frames of channels 1 to N as data of channel N, and transmitting frame data of channels 1 to N to the receiving side as a time division multiple access signal This is achieved by providing a wireless transmission unit that performs the processing.

The above object is also achieved by a channel frame decomposing means for dividing a digital signal transmitted from the above-mentioned digital cordless telephone apparatus into the data of the channels 1 to N, Means for taking out M bits at a time, and thereafter taking out M bits at a time from the K × M bit data of channel 1,..., Channel N to restore digital data in N × M bits and converting the data into the analog modem signal. It is achieved by preparing.

In the above, when the digital encoding means on the transmitting side digitally encodes the analog modem signal into a number of bits smaller than N × M bits, extra bits are added to make digital data in N × M bits, and On the transmitting side, when the transmitting side adds the surplus bits, the surplus bits are deleted from the restored N × M-bit data and converted into an analog modem signal.

The above object is to provide a personal station comprising a fixed base station (hereinafter referred to as a master) connected to a telephone line network and a mobile station (hereinafter referred to as a slave) connected by digital radio communication of up to four channels. Handy phone system (PH
In S), digital encoding means for encoding an analog signal input from a telephone line network or a handset into a 14-bit digital signal (hereinafter referred to as 14-bit linear data) at a period of 8 kHz; Data dividing means for dividing a 16-bit signal obtained by adding an arbitrary 2-bit code to a signal in 4-bit units;
A 4-bit data storage unit for storing data of 4 bits each divided by the data division unit;
If the data stored by the bit data storage means is 160
Channel data transmitting means for assembling digital radio signals into the four radio channels and transmitting them to the slave unit or the base unit when the bits are accumulated; Channel data receiving means for receiving channel data; 16-bit data storing means for storing 160-bit channel data received by the channel data receiving means by combining four bits for each channel as 16-bit data; Analog signal conversion means for converting 14-bit linear data excluding the added 2 bits from the 16-bit data stored by the data storage means into an analog signal at a cycle of 8 kHz;
The 14-bit linear data encoded by the master unit or the slave unit is divided into arbitrary four channels, transmitted to the slave unit or the master unit by digital radio, and the digital data of the four channels received by the slave unit or the master unit is analogized. The conversion is achieved by transmitting and receiving 14-bit linear data wirelessly by the PHS.

The above object also comprises a fixed base station (hereinafter referred to as a master) connected to a telephone line network and a mobile station (hereinafter referred to as a slave) connected by digital radio communication of up to four channels. Personal Handy Phone System (P
(HS), digital encoding means for encoding an analog signal input from a telephone line network or a slave unit into a 16-bit digital signal (hereinafter referred to as 16-bit linear data) at a period of 8 kHz; Data dividing means for dividing a signal into 4-bit units, 4-bit data storing means for respectively storing 4-bit data divided by the data dividing means,
If the data stored by the 4-bit data storage means is 1
Channel data transmitting means for assembling digital radio signals into four radio channels and transmitting them to the slave unit or base unit when 60 bits are accumulated, and assembling into four channels as digital radio signals and transmitting 160 bits from the base unit or slave unit. Channel data receiving means for receiving each channel data, and 160 channel data received by the channel data receiving means.
16-bit data storage means for combining bit channel data by 4 bits for each channel and storing as 16-bit data, and converting the 16-bit linear data stored by the 16-bit data storage means into an analog signal at a period of 8 kHz. Analog signal conversion means for dividing the 16-bit linear data encoded by the master unit or the slave unit into four channels, transmitting the divided data to the slave unit or the master unit by digital radio, and receiving the 4 bits received by the slave unit or the master unit. This is achieved by converting 16-bit linear data wirelessly by PHS by converting the digital data of the channel into an analog signal.

It is another object of the present invention to provide a digital encoding means for encoding an analog signal input from a telephone line network or a slave unit into a 16-bit digital signal (hereinafter referred to as linear data) at a frequency of 8 kHz. Data accumulating means for accumulating data over an interval of 2.5 ms, and channel data transmitting means for transmitting 16 × 40-bit data accumulated by the data accumulating means to a slave unit or a master unit via an arbitrary digital wireless channel. Channel data receiving means for receiving channel data of 16 × 40 bits from a master unit or a slave unit incorporated in an arbitrary channel as a digital radio signal; and transmitting channel data of 16 × 40 bits received by the channel data receiving unit. 16-bit data storage means for storing as 16-bit data, Said linear data stored by Ttodeta storage unit by providing an analog signal conversion means for converting the analog signal at 8kHz cycle,
Achieved.

The N × M-bit linear data encoded by the master unit or the slave unit is divided into arbitrary N channels, transmitted to the slave unit or the master unit by digital radio, and received by the slave unit or the master unit. Because the digital data of the channel is converted into an analog signal, that is, the analog signal is not subjected to ADPCM audio coding processing or PCM audio code compression processing, but is used for wireless communication in non-compression processing by linear audio coding processing. , 28.8 kpbs, it is possible to correctly perform wireless communication without garbled data.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a parent device (upper part in FIG. 1) and a child device (lower part in FIG. 1) of the PHS according to the first embodiment of the present invention. The telephone line network 1 has two lines 4
The line conversion circuit 2 is connected. The two-wire / four-wire conversion circuit 2 separates or combines an analog transmission signal and an analog reception signal. The analog reception signal separated by the two-wire / four-wire conversion circuit 2 is input to the next digital encoding unit 3, where the analog reception signal is digitally encoded and sent to the next data division unit 4.

The data dividing means 4 converts arbitrary 14-bit data encoded by the digital encoding means 3 into two-bit data.
Bits are added as surplus bits, and digital data having a total of 16 bits is divided into four bits. Then, the digital data divided into four bits is temporarily stored in the next-stage 160-bit data buffer 6 through the next 4-bit data storage means 5 and then assembled into a frame that can be wirelessly transmitted by the channel frame assembling section 7 to obtain the channel. The data is divided into four channels by the data transmission means 8 and transmitted from the wireless transmission section 9 to the slave unit.

The data transmitted from the slave unit and received by the radio receiving unit 10 is received by the channel data receiving unit 11 for each channel.
Bit code data is generated. After this code data is stored in the data buffer 13, it is stored in 16-bit units by a 16-bit data storage unit 14. Of the 16 bits, 14 bits excluding the above-mentioned two extra bits are converted into analog signal conversion units 15. Is decoded into an analog signal, and is transmitted from the two-wire / four-wire conversion circuit 2 to the telephone line 1.

A slave connected to a modem 16 of a facsimile or a personal computer transmits and receives a modem signal to and from the modem 16. The modem signal received from the modem device 16 is converted into a 14-bit
It is converted to a 4-bit linear code. In the next data dividing means 18, after arbitrary 2 bits are added to a 14-bit linear code in units of 14 bits, the 16 bits are divided into 4 bits. The data divided into four bits by the data dividing means 18 are sequentially sent to the 160-bit data buffer 20 through the 4-bit data storing means 18.

When the 160 bits of data are stored in the buffer 20, a channel frame assembling section 21 assembles the data into a frame for digital radio transmission.
The data is transmitted to the wireless transmission unit 23 by the channel data transmission unit 21 for each channel. Then, wireless transmission section 23 wirelessly transmits this data to the base unit.

The data transmitted wirelessly from the master unit and received by the wireless receiver 24 of the slave unit is transmitted to the channel data receiving unit 2.
5 for each channel.
In step 6, code data of 160 bits is generated. This 16
0-bit code data is stored in a 160-bit data buffer 2
7 is stored in the 16-bit data storage means 28.
It is stored in 6-bit units. Then, in the analog signal conversion means 29, the 14-bit data from which the previously added 2 bits have been removed is decoded into an analog signal and sent to the modem device 16.

FIG. 2 shows a case where a base station receives a fax signal (analog modem signal) received from the telephone line network 1 by using a TDMA.
FIG. 4 is a signal processing flowchart showing a process from conversion into a signal to wireless transmission to a slave. Slave unit is TDMA transmitted from master unit
The signal is decoded into an analog modem signal and received by the fax machine. Note that the slave sets the analog modem signal of the fax machine to T
The signal processing flow of converting the signal into a DMA signal and wirelessly transmitting the signal to the master unit is also the same as that in FIG. 2, and therefore, the signal processing of the master unit will be described here.

A FAX signal (analog modem signal) input from the telephone line network 1 is separated by the two-wire / four-wire conversion circuit 2 and received. The received analog modem signal is sampled by the digital encoding means 3 at a sampling period of 8 kHz and encoded into a 14-bit 14-bit linear code (符号).

The data dividing means 4 adds arbitrary two bits to the top of the 14-bit linear data of 14 bits encoded by the digital encoding means 3 to form 16-bit data. The upper 4 bits, the upper 4 bits, the lower 4 bits, and the lower 4 bits are divided into 4 bits at a time, and each of the 4 bits is stored by the 4-bit data storage means 5 for the uppermost, upper, lower, lowermost. Is temporarily stored as channel data in each of the 160-bit data buffers 6.

Thereafter, the accumulated data of each 160 bits is
In the channel frame assembling unit 7, a set of the most significant 4 bits (channel 1) and a set of the most significant 4 bits (channel 2)
And a set of lower 4 bits (channel 3) and a set of lower 4 bits (channel 4), each of which is assembled as a channel. Then, the channel data transmitting means 8 has four TDMA (Time Division Multiple
Access) The data is divided into transmission / reception blocks and wirelessly transmitted from the wireless transmission unit 9 to the child device.

FIG. 3 shows the TDMA sent from the slave unit.
FIG. 2 is a signal processing flowchart of a master unit for decoding a signal into an analog modem signal and transmitting the signal to a telephone network 1. The wireless data transmitted from the wireless transmission unit 24 of the slave unit is transmitted to the wireless reception unit 1 of the master unit.
When 0 is received, the received data is received by the channel data receiving means 11 for each channel. Then, 160-bit code data is generated by the channel frame decomposing unit 12 and temporarily stored in the corresponding 160-bit data buffers 13. Thereafter, the four most significant bits, the four most significant bits, the four least significant bits, and the four least significant bits are combined and stored in the 16-bit data storage means 14 in 16-bit units. The 14-bit linear data obtained by removing the most significant 2 bits from the 16-bit data stored in the 16-bit unit is decoded as an analog modem signal by the analog signal conversion means 15 at a period of 8 kHz, and is converted into a 2-line 4 signal.
The signal is transmitted from the line conversion circuit 2 to the telephone line 1.

In the first embodiment, the analog signal is encoded by the digital encoding means 3 into 14-bit digital data. Here, the analog signal is encoded into 16-bit data and 16-bit linear data is transmitted and received. It is also possible to do so.

FIG. 4 is a block diagram of a master unit (upper part of FIG. 4) and a slave unit (lower part of FIG. 4) according to a second embodiment of the present invention. FIGS. 5 and 6 show signal processing flows. FIG. The two-wire / four-wire conversion circuit 32 of the master unit connected to the telephone line 31 separates or combines the analog transmission signal and the analog reception signal.
The analog reception signal (analog modem signal in FIG. 5) separated by the two-wire / four-wire conversion circuit 32 is digitally encoded by a digital encoding means 33 using a sampling signal of 8 kHz, and the encoded digital signal is sent to a data storage means 34. Is output.

The 16-bit linear data stored in the data storage means 34 becomes 160
The data is stored in the bit data buffer 35 and then assembled into frames (channels 1, 2, 3, and 4) that can be wirelessly transmitted by the channel frame assembling unit 36. At the timing when four 160-bit data are prepared, the channel data transmitting unit 37
8 and the TDMA signal is wirelessly transmitted from the wireless transmission unit 38 to the slave unit.

The TD from the slave unit received by the wireless receiver 39
The MA signal is received by the channel data receiving means 40 for each channel (channels 1, 2, 3, and 4 in FIG. 6), and 160-bit code data (digital signal in FIG. 6) is generated by the channel frame decomposing unit 41. You. This code data is stored in the 160-bit data buffer 42,
The data is stored in the 16-bit data storage unit 43 in 16-bit units, decoded by the analog signal conversion unit 44 as an analog modem signal, and transmitted from the two-wire / four-wire conversion circuit 32 to the telephone line 31.

On the other hand, the slave unit transmits and receives a modem signal between the modem unit 45 and the slave unit, and the modem signal received from the modem unit 45 is converted by the digital encoding unit 46 into one.
It is converted into a 16-bit linear code in 6-bit units. The 16-bit linear code data is stored in the data storage unit 47.
Are sequentially accumulated. When the data accumulated in the data accumulating means 47 is accumulated for 160 bits, it is taken into the 160-bit data buffer 48, assembled into a frame for digital radio transmission by the channel frame assembling section 49, and the 160-bit data is converted into 4 bits. When they are completed, the channel data transmission unit 50 sends the data to the wireless transmission unit 51 for each channel, and the wireless transmission unit 51 wirelessly transmits the TDMA signal to the parent device.

TD from master unit received by radio receiving unit 52
The MA signal is received by the channel data receiving unit 53 for each channel, and 160-bit code data is generated by the channel frame decomposing unit 54. This code data is 16
After being stored in the 0-bit data buffer 55, the data is stored in 16-bit units by the 16-bit data storage unit 56, decoded into an analog modem signal by the analog signal conversion unit 27, and sent to the modem device 45. As a result, the fax signal received by the master unit from the telephone line 31 is transmitted to the modem 45.
Is received.

As described above, in the present embodiment, the 14-bit or 16-bit linear data encoded by the master unit or the slave unit is divided into arbitrary four channels and transmitted to the slave unit or the master unit by digital radio. 4 received by slave unit or master unit
The digital data of the channel is converted into an analog signal. That is, in the present embodiment, the analog signal is not subjected to the ADPCM voice coding process or the PCM voice code but is not subjected to the compression process by the linear voice coding process, so that the wireless communication is performed. Therefore, even the modem signal exceeding 28.8 kpbs is converted into data. Wireless communication can be performed correctly without performing.

[0031]

According to the present invention, since wireless communication is performed without performing data compression processing, even high-speed modem signals can be correctly transmitted and received without causing data corruption.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a digital cordless telephone device (base unit and handset) according to a first embodiment of the present invention.

FIG. 2 is a flowchart of transmission signal processing in the digital cordless telephone device shown in FIG.

FIG. 3 is a flowchart of a received signal process in the digital cordless telephone device shown in FIG. 1;

FIG. 4 is a schematic block diagram of a digital cordless telephone device (base unit and handset) according to a second embodiment of the present invention.

FIG. 5 is a flowchart of transmission signal processing in the digital cordless telephone device shown in FIG. 4;

6 is a flowchart of a received signal process in the digital cordless telephone device shown in FIG.

[Explanation of symbols]

 1,31 Telephone line 2,32 2-wire 4-wire conversion circuit 3,17,33,46 Digital encoding means 4,18 Data division means 5,19 4-bit data storage means 6,20,35,48 160-bit data buffer 7 , 21,36,49 Channel frame assembling unit 8,22,37,50 Channel data transmitting means 9,23,38,51 Wireless transmitting unit 10,24,39,52 Wireless receiving unit 11,25,40,53 Channel data Receiving means 12, 26, 41, 54 Channel frame decomposing section 13, 27, 42, 55 160-bit data buffer 14, 28, 43, 56-bit data storing means 15, 29, 44, 57 Analog # signal converting means 16, 45 FAX modem device 34, 47 Data storage means

Claims (7)

[Claims] 1. A personal handy phone system (PH)
S) In a digital cordless telephone device for transmitting and receiving an analog modem signal between a transmitting side and a receiving side, an analog modem signal input from a telephone line network or a modem device is converted into N × M (N, M: positive integer) bit units. Digital encoding means for encoding a digital signal of
Data dividing means for dividing the bit into N pieces of M bits each from the most significant bit;
(K: positive integer) bits are accumulated to form channel 1 data, and data for each M bits are successively accumulated for each K × M bit to become data for one channel.
Channel frame assembling means for accumulating K × M bits of bit data and assembling frames of channels 1 to N as data of channel N, and transmitting the frame data of channels 1 to N to the receiving side as a time division multiple access signal A digital cordless telephone device comprising: a wireless transmission unit. 2. The method according to claim 1, wherein when the digital encoding means digitally encodes the analog modem signal into a number of bits smaller than N × M bits, extra bits are added to the digital data in N × M bits. A digital cordless telephone device. 3. A channel frame decomposing means for dividing a digital signal transmitted from the digital cordless telephone device according to claim 1 or 2 into data of said channels 1 to N; M bits are fetched from the data of each bit, and then, from the data of K × M bits of channel 1,.
Means for restoring digital data in units of N × M bits by extracting each bit and converting the digital data into the analog modem signal. 4. The method according to claim 3, wherein, when a surplus bit is added on the transmission side, the surplus bit is deleted from the restored N × M bits of data and converted into an analog modem signal. Digital cordless telephone device. 5. A personal handy phone comprising a fixed base station (hereinafter, referred to as a master unit) connected to a telephone line network and a mobile station (hereinafter, referred to as a slave unit) connected by digital wireless communication of up to four channels. In a system (PHS), digital encoding means for encoding an analog signal input from a telephone line network or a handset into a digital signal of 14 bits (hereinafter referred to as 14-bit linear data) at a period of 8 kHz; Data dividing means for dividing a 16-bit signal obtained by adding an arbitrary 2-bit code to the digital signal into four bits, and 4-bit data storage for storing the 4-bit data divided by the data dividing means, respectively. Means for storing data stored by said 4-bit data storage means when 160 bits have been accumulated. Channel data transmitting means for incorporating the radio signals into the four radio channels and transmitting the data to the slave unit or the master unit; and channels incorporating the digital radio signals for the four channels and receiving the channel data of 160 bits each from the master unit or the slave unit Combining the data receiving means with the 160-bit channel data received by the channel data receiving means by 4 bits for each channel,
16-bit data storage means for storing as 6-bit data, and 14-bit linear data excluding the added 2 bits from the 16-bit data stored by the 16-bit data storage means, is converted into an analog signal at a period of 8 kHz. Analog signal conversion means for converting 14-bit linear data encoded by the base unit or the
By dividing the data into channels and transmitting the digital data to the slave unit or the master unit by digital radio, and converting the digital data of four channels received by the slave unit or the master unit into analog signals,
A digital cordless telephone device for transmitting and receiving bit linear data wirelessly by PHS. 6. A personal handy phone comprising a fixed base station (hereinafter referred to as a base unit) connected to a telephone line network and a mobile station (hereinafter referred to as a sub unit) connected by digital radio communication of up to four channels. In a system (PHS), digital encoding means for encoding an analog signal input from a telephone line network or a handset into a 16-bit digital signal (hereinafter referred to as 16-bit linear data) at a period of 8 kHz; Data dividing means for dividing the digital signal into four bits, four-bit data storing means for storing the data of each four bits divided by the data dividing means, and data stored by the four-bit data storing means. Are stored as digital radio signals in four radio channels when 160 bits are stored. Channel data transmitting means for transmitting to the device or the master, channel data receiving means for incorporating 160-bit channel data from the master or the slave incorporated into four channels as a digital radio signal, and channel data receiving means; Combining the received 160-bit channel data by 4 bits for each channel, 1
A master unit or a slave unit, comprising: 16-bit data storage means for storing as 6-bit data; and analog signal conversion means for converting 16-bit linear data stored by the 16-bit data storage means into an analog signal at a cycle of 8 kHz. By dividing the 16-bit linear data encoded in the above into four channels and transmitting the digital data to the slave unit or the base unit by digital radio, and converting the digital data of the four channels received by the slave unit or the base unit into an analog signal, A digital cordless telephone device for transmitting and receiving 16-bit linear data wirelessly by PHS. 7. Digital encoding means for encoding an analog signal input from a telephone line network or a slave unit into a digital signal of 16 bits at a period of 8 kHz (hereinafter referred to as linear data); Data storage means for storing data over an interval of 5 ms, channel data transmitting means for transmitting 16 × 40 bit data stored by the data storage means to a slave unit or a base unit via an arbitrary digital wireless channel; 16 × 40 from the parent device or child device incorporated in any channel as
Channel data receiving means for receiving bit channel data, and 1 channel data received by the channel data receiving means.
16-bit data storage means for storing 6 × 40-bit channel data as 16-bit data;
A digital cordless telephone device comprising: an analog signal converting unit that converts the linear data stored by the 6-bit data storing unit into an analog signal at a cycle of 8 kHz.