JP3347631B2 - Digital cordless telephone system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital communication system capable of improving the transfer rate by using a plurality of wireless channels when wirelessly connecting the wiring in data communication such as personal computer communication using deemed voice. It relates to a cordless telephone system. The present invention is suitable for a digital wireless telephone system such as a PHS.

[0002]

2. Description of the Related Art Conventionally, personal computer communication using deemed voice using a modem has been generally performed, and data communication using deemed voice such as home-use karaoke and Internet TV has become more and more active. ,
There is also a rapidly growing demand for making these wired wires wireless and performing data communications, etc. anywhere.
Although a method based on wireless wiring using HS or the like has been used, the speed of data communication using deemed voice using PHS has generally been limited to about 9600 bps.

[0003] Here, data communication based on a deemed voice by the conventional PHS will be described with reference to the drawings. FIG. 6 is a block diagram of a conventional PHS slave unit. 6, reference numeral 601 denotes a microphone; 602, a microphone amplifier;
Is a PCM codec that converts analog signals and PCM data, and 604 is an ADPC that converts data of 8-bit PCM data and compressed 4-bit data by the ADPCM method.
M and 605 are codec paths, 606 is a QPSK modulation / demodulation circuit, 607 is a transmission / reception circuit, 608 is a speaker, 60
9 is a speaker amplifier, 610 is a deemed voice data communication I / F unit or the like, and a deemed voice interface;
Is an antenna.

FIG. 7 is a block diagram of a conventional PHS master unit. To explain the configuration of FIG. 7, 701 is a modular jack, 702 is a line I / F (interface) unit,
703 is a PCM that converts an analog signal and PCM data
Codec 704 is 8-bit PCM data and compressed 4
ADPCM for converting bit data, 705 is a codec path, 706 is a QPSK modulation / demodulation circuit, 707 is a transmission / reception circuit, and 708 is an antenna.

FIG. 8 is an example showing a data relationship between a master unit and a slave unit in the case of the TDMA / TDD system. The flow of data from the master to the slave is down, and the flow of data from the slave to the master is defined as up. From T1 to T4, the timing of transmission by the master is from R5 to R8. Indicates the reception timing by the base unit, R1 to R4 indicate the reception timing by the slave unit, and T5 to T8 indicate the transmission timing by the slave unit. Further, a is data created by the PCM codec 703 of the master unit and compressed by the ADPCM 704 and transmitted as one slot data from the master unit to the slave unit, and a ′ is created by the PCM codec 603 of the slave unit. The data compressed by the ADPCM 604 is collected as data for one slot and transmitted from the slave unit to the master unit.

FIG. 9 shows a process of compression and decompression by the ADPCM 905. PCM codec 90 when sending
1 to 8-bit PCM data (90
2 to 904), the ADPCM 905 compresses the data into 4-bit data (906 to 908), and transmits it to the codec path 909. At the time of reception, 4-bit data (906 to 908) is transmitted from the codec path 909 to the ADPCM 90.
5, the ADPCM 905 restores 8-bit PCM data (902 to 904) from the 4-bit data and transmits it to the PCM codec 901.

The conventional operation will be described below with reference to FIGS. First, a case will be described in which communication data is transmitted from the master unit to the slave unit by using a deemed voice. The deemed audio data is usually input to the modular jack 701 of FIG. 7 via an analog public line. After that, the line I / F
After passing through the section 702 and being converted to 8-bit PCM data by the PCM codec 703, the ADPCM 704 converts the data into 8-bit PCM data.
Compressed to bits and passed through codec path 705
The signal is transmitted as a radio wave from an antenna 708 by a transmission / reception circuit 707 via a PSK modulation / demodulation circuit 706. On the slave side, the radio wave is received by the antenna 611 of FIG. 6 and input to the QPSK modulation / demodulation circuit 606 via the transmission / reception circuit 607, and from there, the ADPCM 60 via the codec path 605.
4 and converted into 4-bit to 8-bit PCM data, converted into an analog signal by the PCM codec 603, transmitted to a data communication terminal interface such as the data communication I / F unit 610 for deemed voice, and then transmitted to a modem or the like. Sent out. In this way, the deemed voice data received by the master unit from the line is transmitted to a modem or the like connected to the slave unit.

Next, a case will be described in which communication data is transmitted from the slave unit to the master unit by the deemed voice. The deemed voice data is input via the modem to the data communication I / F unit 610 for the deemed voice of the slave unit in FIG. After that, PC
After being converted into 8-bit PCM data by the M codec 603, the data is compressed to 4 bits by the ADPCM 604, passes through the codec path 605, and passes through the QPSK modulation / demodulation circuit 60.
The signal is transmitted as a radio wave from the antenna 611 by the transmission / reception circuit 607 through 6. On the master unit side, the radio wave is received by the antenna 708 shown in FIG. 7 and is input from the transmission / reception circuit 707 to the ADPCM 704 via the QPSK modulation / demodulation circuit 706 via the codec path 705, where it is restored to PCM data of 4 bits to 8 bits and converted to PCM data. Codec 70
The signal is converted into an analog signal at 3 and sent to the modular jack 701 via the line I / F section 702. In this manner, the assumed voice data received from the modem or the like connected to the slave unit is transmitted to the line on the master unit side.

[0009]

In the conventional system, the PC
The amount (the number of bits) of the PCM data created by the M codec 603 and the PCM codec 703 is the radio 1
Since it is larger than the amount of data (the number of bits) that can be transmitted in the channel, the ADPCM 604 and the ADPCM 70
According to No. 4, it was necessary to go through the compression / decompression process of PCM data. However, in the current ADPCM, the reproducibility of voice data when the data is passed through the compression / decompression process of PCM data is reduced. Therefore, in data communication and the like, this is one of the serious causes for lowering the communication speed. there were.

[0010]

SUMMARY OF THE INVENTION The present invention divides PCM data into a plurality of radio signals without performing a compression / decompression process of PCM data, which degrades the reproducibility of voice data at the time of deemed voice data communication. It is provided with a means for transmitting to a channel and combining it on the receiving side to restore the PCM data before division.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With the above configuration, an ADPC for performing data communication using assumed voice using wireless communication
M can remove the effect on the sound reproducibility,
The communication speed of data communication can be greatly improved.
Specifically, in wireless communication such as a PHS system, at the time of data communication using deemed voice (data obtained by converting non-voice data of a personal computer or the like into a voice data format using a modem)
By dividing a digital signal (such as PCM data) obtained by digitizing an audio signal into a plurality of wireless channels without performing compression such as ADPCM and transmitting and receiving the signal,
Eliminates deterioration due to compression and enables high-speed data communication. For this purpose, a digital cordless telephone system in which each of the master unit and the slave unit can use a plurality of wireless channels, both the master unit and the slave unit have TDMA / TDD time-division multiplexing transmission equipment, The function of distributing the digital signal obtained by the digitization process into a plurality of parts and transmitting it on multiple radio channels, and combining the digital signal before being divided from the digital signal divided into those parts and sent at the time of reception It has a synthesizing function to reproduce.

An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the wireless channel is TD
Two wireless channels are realized by using two MA / TDD slots, and data communication is performed by dividing 8-bit PCM data into upper 4 bits and lower 4 bits and transmitting / receiving the data using the previous two wireless channels. I have. FIG. 1 is a block diagram of a PHS slave unit embodying the present invention. FIG.
101, a microphone; 102, a microphone amplifier; 103, a PCM codec for converting analog signals and PCM data; 104, ADPCM for converting 8-bit PCM data and compressed 4-bit data; 105, a codec path; Is a QPSK modulation / demodulation circuit, 107
Is a transmitting / receiving circuit, 108 is a speaker, 109 is a speaker amplifier, 110 is a second codec path, 111 is a data communication I / F section for a deemed voice, and a deemed voice interface. 112 is two PCM data at the time of transmission. The receiving and dividing circuit combines the PCM data before division from the two divided PCM data, and 113 denotes an antenna.

FIG. 2 is a block diagram of a PHS master unit embodying the present invention. 2, a modular jack 201, a line I / F 202, a PCM codec 203 for converting analog signals and PCM data, an ADPCM 204 for converting 8-bit PCM data and compressed 4-bit data, 205 is a codec pass,
206 is a QPSK modulation / demodulation circuit, 207 is a transmission / reception circuit,
08 is an antenna, 209 is a codec path used for the second communication, 210 is 8-bit PCM data that is divided into upper 4 bits and lower 4 bits at the time of transmission, and 8 bits before the division from upper 4 bits and lower 4 bits at the time of reception. This is a distribution / combination circuit having a function of combining and restoring bit PCM data.

FIG. 3 shows an example of a data relationship between a master unit and a slave unit in the case of the TDMA / TDD system. The flow of data from the base unit to the slave unit is defined as down, and the flow of data from the slave unit to the master unit is defined as ascend. From T1 to T4, the timing of transmission by the master unit, and from R5 to R8, The reception timing by the master unit, R1 to R4 indicate the reception timing by the slave unit, and T5 to T8 indicate the transmission timing by the slave unit. Also, a1 and a2 are data created by the PCM codec 203 of the master unit and divided into 4 bits by the distribution / combination circuit 210, and transmitted as one slot data from the master unit to the slave unit. 1, a'2 is the PCM codec 10 of the slave unit
3, data divided into 4 bits by the distribution / synthesis circuit 102 are collected into one slot and transmitted from the slave unit to the master unit.

FIG. 4 shows distribution / combination by the distribution / combination circuit 405.
The synthesis process is shown. At the time of transmission, 8-bit PCM data (402 to 404) is input from the PCM codec 401 to the distribution / combination circuit 405,
5 is divided into 4-bit data (406 to 411) and transmitted to the codec path 412 and the codec path 413, respectively. At the time of reception, 4-bit data (406 to 41) is output from the codec path 412 and the codec path 413.
1) is input to the distribution / synthesis circuit 405, and the distribution / synthesis circuit 405 converts the 4-bit data (406 to 411) to 8
Bit PCM data (402-404) is restored and P
It is transmitted to the CM codec 401.

FIG. 5 shows an example of data communication when the present invention is implemented. In FIG. 5, reference numeral 501 denotes an analog public line, and 502 denotes a modular jack disposed on a wall or the like.
03 is a PHS master unit implementing the present invention, 504 is a PHS slave unit implementing the present invention, 505 is a modem, 506 is a personal computer, 507 is a first wireless channel, 50
Numeral 8 conceptually represents the second wireless channel. These are the P
1 conceptually shows an example of data communication using HS.

Hereinafter, the operation at the time of data communication according to the present invention will be described with reference to FIGS. First, a case will be described in which communication data is transmitted from the master unit to the slave unit by using a deemed voice. The deemed audio data is usually input to the modular jack 201 of FIG. 2 via an analog public line. Thereafter, the signal passes through a line I / F unit 202, is converted into 8-bit PCM data by a PCM codec 203, is divided into upper 4 bits and lower 4 bits by a distribution / synthesis circuit 210, and is divided into a codec path 205 and a codec path 205. 209 respectively. After that, the antenna 20 is transmitted by the transmission / reception circuit 207 through the QPSK modulation / demodulation circuit 206.
8 and transmitted as radio waves. On the slave side, the radio wave is received by the antenna 113 in FIG. 1 and is input from the transmission / reception circuit 107 to the QPSK modulation / demodulation circuit 106, and from there is input to the distribution / combination circuit 112 via the codec path 105 and the codec path 110. Therefore, each 4-bit data is restored to 8-bit PCM data and
The codec 103 converts the analog signal into an analog signal, transmits the analog signal to a data communication terminal interface such as the data communication I / F unit 111, and sends the data to a modem or the like. In this way, the deemed voice data received by the master unit from the line is transmitted to a modem or the like connected to the slave unit.

Next, a case will be described in which communication data is transmitted from the slave unit to the master unit by means of a deemed voice. The deemed voice data is input via the modem to the data communication I / F unit 111 for the deemed voice of the slave unit in FIG. After that, PC
After being converted into 8-bit PCM data by the M codec 103, it is divided into upper 4 bits and lower 4 bits by the distribution / combination circuit 112, passes through the codec path 105 and the codec path 110, and passes through the QPSK modulation / demodulation circuit 106.
And transmitted as a radio wave from the antenna 113 by the transmission / reception circuit 107. On the parent device side, the radio wave is received by the antenna 208 of FIG. 2 and passes from the transmission / reception circuit 207 through the QPSK modulation / demodulation circuit 206 to the codec path 205,
Distribution / combination circuit 21 via codec path 209
0, where it is restored from each 4-bit data to 8-bit PCM data.
The signal is converted into an analog signal at 3 and sent to the modular jack 201 via the line I / F section 202. In this manner, the assumed voice data received from the modem or the like connected to the slave unit is transmitted to the line on the master unit side.

In a normal call, not during data communication, the slave unit does not pass through the distribution / synthesizing circuit 112, but the ADPCM 104 as in the prior art, and the master unit does not pass through the distribution / synthesizing circuit 210. ADPCM 204
The communication is possible by using a wireless channel on one channel by compressing the PCM data through the PCM. Next, an example of a data combining method on the receiving side will be described with reference to FIGS. First, as shown in FIG. 10, on the transmitting side, the upper 4 bits are f, f, f..., And the lower 4 bits are 0, 0, 0... So that the receiving side can first determine the upper 4 bits and the lower 4 bits.・ Continue sending. On the receiving side, f,
The channels receiving f, f... are assigned to the upper 4 bits, and the channels receiving 0, 0, 0... are assigned to the lower 4 bits to determine the upper 4 bits and the lower 4 bits. Next, as shown in FIG. 11, the transmission side transmits special bit deviation correction data such as 1, 2, and 3 so that the reception side can correct the deviation of the reception timing between the upper 4 bits and the lower 4 bits. The receiver receives 1 on either channel,
When bit shift correction data such as 2 and 3 is received, bit shift correction data is acquired in the other channel. After that, the positional relationship of the received data is corrected so that 1 and 1, 2 and 2 and 3 and 3 of the received data are combined, and thereafter the combination is performed while maintaining the positional relationship. FIG. 12 shows an example of a calling procedure when the above-described combination method is specifically executed. Here, the distinction between the call and the data communication is distinguished by whether the call button of the slave unit is pressed or the off-hook signal to the data communication I / F unit. If an off-hook signal to the data communication I / F unit is detected as shown in the sequence of FIG. 12, the slave unit calls the master unit with a special number such as *** indicating data communication. When the master unit recognizes the call using the special number, the master unit starts the data communication mode sequence thereafter.

FIG. 13 shows an example of a detection method when the synchronization of the combination is shifted for some reason during the synthesis of 4-bit data to 8-bit data. The transmitting side inserts and transmits predetermined data 0xff at a predetermined timing, and the receiving side determines whether or not the synchronization has been lost based on whether or not the data received at the predetermined timing is 0xff. Deciding. If the received data is other than 0xff, the synchronization is re-established.

[0021]

As described above, according to the present embodiment, even during data communication using deemed voice, the PCM data is divided and transmitted over a plurality of wireless channels, thereby improving the reproducibility of voice data. The communication speed of data communication using deemed voice can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a PHS slave according to an embodiment of the present invention.

FIG. 2 is a block diagram of a PHS master according to the embodiment of the present invention;

FIG. 3 is a diagram illustrating TDMA / TDD slots and transmission data according to an embodiment of the present invention.

FIG. 4 is a diagram related to distribution and combination of a distribution / combination circuit according to an embodiment of the present invention.

FIG. 5 is a diagram showing a concept of data communication for explaining an embodiment of the present invention;

FIG. 6 is a block diagram of a conventional PHS slave unit.

FIG. 7 is a block diagram of a conventional PHS base unit.

FIG. 8 is a diagram related to conventional TDMA / TDD slots and transmission data.

FIG. 9 is a diagram showing a conventional ADPCM and a compression function.

FIG. 10 is a diagram related to a method of determining upper 4 bits and lower 4 bits according to the embodiment of the present invention.

FIG. 11 is a diagram of a bit shift correction method for upper 4 bits and lower 4 bits according to an embodiment of the present invention.

FIG. 12 is a diagram showing an example of a calling procedure on two channels according to an embodiment of the present invention.

FIG. 13 is a diagram illustrating an example of a synchronization shift detection method according to an embodiment of the present invention.

[Explanation of symbols]

101, 601 ... microphone, 102, 602 ...
Microphone amplifier, 103, 203, 401, 603, 70
3, 901 ... PCM codec, 104, 20
4, 604, 704, 905 ... ADPCM, 10
5, 110, 205, 209, 412, 413, 60
5, 705, 909 ... cordic path, 106,
206, 606, 706... QPSK modulation / demodulation circuit, 1
07, 207, 607, 707 ... transmission / reception circuit, 10
8, 608: speaker, 109, 609: speaker amplifier, 111, 610: data communication I / F unit for assumed voice, 112, 210, 405: distribution
Synthetic circuit, 113, 208, 611, 708 ... antenna, 201, 502, 701 ... modular jack, 202, 702 ... line I / F section, 402, 40
3, 404, 902, 903, 904... PCM data, 406, 407, 408, 409, 410, 411
... Divided PCM data, 501... Analog public line, 503... PHS master, 504.
HS slave unit, 505: modem, 506: personal computer, 507, 508: wireless channel, 509
..Walls, 906, 907, 908... Compressed P
CM data

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 102 H04Q ^7/ 00-7/38

Claims (4)

(57) [Claims] In a digital cordless telephone system capable of transmitting and receiving using a plurality of wireless channels by a time division multiplex communication system, an audio signal is compressed and transmitted on one wireless channel, and deemed audio data is compressed. A device that divides the data without dividing it and allocates it to a plurality of wireless channels, and decodes the data of one wireless channel to be received during voice communication and reproduces the data as a voice signal; A device that synthesizes each data without decoding, and reproduces the deemed voice data before division, and separates the data communication mode by the voice deemed as a call, the carrier transmitted by the modem of the data communication partner, or Digital is characterized by automatic detection by detecting a carrier or off-hook signal sent by the modem on the local side. Doresu telephone system. 2. In a digital cordless telephone system capable of transmitting and receiving using a plurality of wireless channels, a digital signal created by voice digitization is divided into a plurality of signals and transmitted separately using a plurality of wireless channels. And a device that reproduces the digital signal before division by combining received signals that have been divided and transmitted using a plurality of wireless channels at the time of reception. A digital cordless telephone system, wherein the separation is automatically performed by detecting a carrier transmitted by a modem of a data communication partner, or a carrier transmitted by a modem on its own side or a signal indicating off-hook. 3. In a digital cordless telephone system capable of transmitting and receiving using a plurality of wireless channels by a time division multiplex communication system, an audio signal is compressed and transmitted on one wireless channel, and deemed audio data is compressed. A device that divides the data without dividing it and allocates it to a plurality of wireless channels, and decodes the data of one wireless channel to be received during voice communication and reproduces the data as a voice signal; A device that synthesizes each data without decoding processing and reproduces it as deemed audio data before division, and a device that transmits and receives is composed of a master unit and a slave unit. When a signal for performing data communication is detected, after the wireless connection is established, the data in the control information area of the used channel is used, and before the wireless connection is established, the call information at the time of the wireless connection, or By notifying the communication partner in the call information, the digital cordless telephone system, characterized in that for automatically migrates communication partner to the data communication mode. 4. In a digital cordless telephone system capable of transmitting and receiving using a plurality of wireless channels, a digital signal created by voice digitization is divided into a plurality of signals and transmitted separately using a plurality of wireless channels. And a device that reproduces a digital signal before division by combining received signals that have been divided and transmitted using a plurality of radio channels at the time of reception. When either the master unit or the slave unit detects a signal for performing data communication, it uses the data in the control information area of the used channel after wireless establishment, and establishes wireless communication before wireless establishment. By notifying the communication partner with outgoing call information or incoming call information at the time,
A digital cordless telephone system wherein a communication partner is automatically shifted to a data communication mode.