JP3335148B2 - Key telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer system, and more particularly, to a data transfer apparatus having a simplified configuration by minimizing the number of ADPCM transcoders for performing bit rate conversion.

[0002]

2. Description of the Related Art As an example of using an ADPCM transcoder for performing bit conversion, there is a key telephone apparatus accommodating a PHS slave unit. In this type of key telephone device, wireless interfaces are provided as antenna units corresponding to the number of communicable PHSs and the number of communicable channels, and rate conversion of signals received corresponding to each wireless interface is performed. An ADPCM transcoder is provided. The signal whose rate has been converted by the ADPCM transcoder is connected to a desired office line interface office line interface unit by a time switch unit.

FIG. 2 is a block diagram showing a simplified configuration of a key telephone apparatus employing a conventional PHS.

In the key telephone apparatus shown in FIG. 2, a plurality (three in this example) of PHS1 to PHS3 can be accommodated, and a radio interface necessary for that, ie, the number of communicable channels (three in this example) is required. Parts 11 to 13 are provided. 32k as a call signal from any PHS
A bps digital audio signal or any other digital data signal is emitted in the form of a radio signal. ADPCM transcoders 21 to 23 for rate conversion are provided corresponding to these wireless interface units 11 to 13, respectively.

The wireless interface units 11 to 13 and the ADP
Since each of the CM transcoders 21 to 23 performs the same operation, any one of them may be performed in the following description.

[0006] The radio interface unit 11 processes the digital signal received as a radio signal and outputs the digital signal to an output terminal RO1.
From the input terminal AI of the corresponding ADPCM transcoder 21. The ADPCM transcoder 21 converts digital audio data of 32 kbps input according to the V.110 standard into digital data of 64 kbps. On the other hand, when the signal received from the wireless interface unit 11 is digital data of 32 kbps, the received signal is directly bypass-outputted to the time switch unit 3 without performing this rate conversion.

The time switch section 3 has its input side (input terminals TI1 to TI3) connected to the output side (output terminal PO) of the corresponding ADPCM transcoders 21 to 23, respectively, and has its output side (output terminals TO4 to TO6). Are connected to the corresponding office line interface (I / F) units 41 to 43.

The time switch section 3 performs time-division processing of the rate-converted audio data output from the ADPCM transcoders 21 to 23 and the digital data which has been bypassed without being rate-converted, and performs predetermined station line processing. It is connected to the interface units 41 to 43.

In the office line interface units 41 to 43, digital data input to the input terminal CI is output to a digital line such as ISDN as an office line, or the input digital data is D / A converted to obtain an analog signal and obtain an analog signal. Send to line.

On the other hand, an analog signal from an analog line or digital data from a digital line such as ISDN is input to input terminals TI4 to TI6 of a time switch section 3, and the analog signal is A / D converted to digital data. The digital data is output directly from the output terminals TO1
Output via TO3. For example, the time switch unit 3
Is input to the input terminal PI of the ADPCM transcoder 21, the audio data is rate-converted to 32-bit data, and the digital data is bypassed as it is to the input terminal RI1 of the wireless interface unit 11. Sent out. From the wireless interface unit 11, voice data and digital data are transmitted to the PHS in the form of wireless signals.

[0011]

As described above, in the conventional data transfer apparatus, a number of ADPCM transcoders corresponding to the radio interface unit are provided. However, in recent years, applications that do not use the ADPCM transcoder, such as wireless data communication, have been increasing.
When a CS (premise antenna as a wireless interface) is installed to expand the wireless area, the function of the ADPCM transcoder is unnecessary although it is installed. There is a problem that the price increases.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a data transfer apparatus which simplifies the configuration by minimizing the number of bit rate conversion units and reduces the cost.

[0013]

In order to solve the above-mentioned problems, a data transfer device according to the present invention employs the following characteristic configuration.

(1) A plurality of terminal devices capable of transmitting and receiving a plurality of data having different data rates can be accommodated, and a specific number of radio interface units and a local line interface unit are provided between
In a data transfer apparatus provided with a rate conversion unit for performing data rate conversion, the number of the rate conversion units is set to a number smaller than the specific number and two or more, and the wireless interface unit and the line interface unit Between
Data that requires rate conversion is sent to the rate conversion unit for rate-converted data, and data that does not require rate conversion is the data as it is without passing through the rate conversion unit, the corresponding wireless interface unit or A data transfer device comprising a switch unit for sending to a central office interface unit.

(2) The data transfer device according to (1), wherein the terminal device is a PHS.

(3) A predetermined number of PHSs and a radio interface are connected by a radio line. The radio interface unit transmits and receives data between the radio interface unit and the local line interface unit, and converts a rate conversion unit for performing data rate conversion to the radio interface unit. Less than two or more ,
A data transfer device which performs rate conversion by the rate converter in accordance with data contents or performs rate conversion without passing through the rate converter.

(4) A predetermined number of PHSs and a radio interface are connected by a radio line, and data exchange between the radio interface unit and the office line interface unit is performed by a time switch unit and a data rate conversion is performed. Parts less than the wireless interface
A data transfer device that is installed by two or more and sends the data to the rate conversion unit via the time switch unit according to the data content, or sends the data to the destination without sending it to the rate conversion unit .

(5) The data transfer device according to (3) or (4), wherein the time switch unit has a function of converting an analog signal from the central office interface unit into a digital signal.

(6) The data transfer device according to any one of (2) to (5), wherein the data handled by the PHS and the radio interface unit are 32-bit audio data and any other digital data.

(7) The data transfer device according to any one of (1) to (6), which is applied to a key telephone device.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a data transfer device according to the present invention will be described below in detail with reference to the accompanying drawings, particularly FIG.

In FIG. 1, a predetermined number (three in this example) of PHS1 to PHS3 and a predetermined number (three in this example) of radio interface units 11 to 13 are connected by a radio line.
Data is exchanged between the two by wireless signals. That is, a 32 kbps digital voice signal or data signal is transmitted and received as a communication signal in the form of a radio signal.

The output terminals RO1 to RO3 and the input terminals RI1 to RI3 of the wireless interface units 11 to 13 are provided.
Is a corresponding input terminal TI1 of the time switch unit 3.
To TI3 and output terminals TO1 to TO3.

The time switch section 3 further includes a predetermined number (two in this example) of rate conversion ADPCM transcoders 2.
1 and 22 are connected, and the wireless interface unit 1 is connected via input terminals TI1 to TI10 and output terminals TO1 to TO10.
1 to 13, the ADPCM transcoders 21 and 22, and the line interface units 41 to 43 are connected in a time-division manner.

The time switch section 3 has a predetermined number (three in this example) of station line interface sections 41 to 43 connected to a station line such as an analog line or a digital line such as ISDN for performing an interface. CI1 to CI3 and CO1 to CO3, input / output terminals TO4 to TO6 and TI4
Through TI6.

As described above, in this embodiment, the ADPC
The M transcoder employs a configuration in which only a minimum number (two in this example) is provided, so that the device configuration can be simplified and the device cost can be reduced as compared with the related art.

Hereinafter, the operation of the data transfer device according to the present embodiment will be described. For example, the wireless interface unit 11
Processes a digital signal received as a radio signal from the PHS, and sends the digital signal from the output terminal RO1 to the input terminal TI1 of the time switch unit 3. In the time switch unit 3, when the data received at the input terminal TI1 is digital audio data of 32 kbps, the ADP is output from the output terminal TO7.
It is sent to the input terminal AI1 of the CM transcoder 21.
The ADPCM transcoder 21 converts the 32 kbps audio digital data received from the input terminal AI1 into G.
The data is converted into 64 kbps audio digital data according to the G.721 standard and transmitted from the output terminal PO1 to the input terminal TI8 of the time switch unit 3.

The time switch section 3 sends the data thus rate-converted to any of the station line interface sections 41 to 43 via any of the output terminals TO4 to TO6 to perform communication with the station line. I do.

On the other hand, when the signal received from the wireless interface unit 11 is digital data of 32 kbps, the time switch unit 3 controls the ADPCM transcoder 21
Is not carried out, the data is passed through as it is and output to any of the station line interface units 41 to 43 via any of the output terminals TO4 to TO6.

When another radio interface unit (for example, the radio interface units 12 and 13) receives a signal from the PHS, the same operation is performed via the time switch unit 3 and the ADPCM transcoder 21 or 22.

As described above, the time switch unit 3 outputs data of 32 k from the radio interface units 11 to 13.
Depending on whether the data is bps audio data or arbitrary digital data, the audio data is sent to one of the ADPCM transcoders 21 and 22 in order to perform a rate conversion. It is sent to any of the office line interface units 41 to 43 without passing through.

In the line interface units 41 to 43, the digital data input to the input terminal CI is converted to a digital line such as an ISDN as a line, or the input digital data is converted from analog to digital to obtain an analog signal. Send to line.

On the other hand, an analog signal from an analog line or digital data from a digital line such as ISDN is transmitted to one of the input terminals TI4 to TI6 of the time switch unit 3 via the local line interface units 41 to 43. In the time switch unit 3, if the input signal is an analog signal, it is A / D converted to digital data, and if it is digital data, the output terminals TO1 to TO
3 to one of the corresponding wireless interface units 11 to 13.

When the signal input to the time switch section 3 is audio data, the data is output to the output terminals TO8 and T8.
O10 is input to the corresponding input terminal PI1 or PI2 of the ADPCM transcoder 21 or 22, is rate-converted into 32 kbps audio data, and the obtained data is output from the output terminals AO1 and AO2 to the input terminal TI7 or Input to TI9. Then, the signal is input to one of the input terminals RI1 to RI3 of the corresponding wireless interface units 11 to 13 via any one of the output terminals TO1 to TO3 of the time switch unit 3.

More specifically, in the example shown in FIG. 1, the PHS 1 is
The figure shows the connection relationship by the time switch unit 3 when the PHS 3 executes data communication with the office line interface unit 43, respectively.

That is, the ADPCM transcoder 21
Is input to the output terminal TO7 of the time switch unit 3 and the output terminal PO of the data after the rate conversion.
1 is connected to the input terminal TI8 of the time switch unit 3, and the output terminal TO8, to which data from the local line input to the input terminal TI4 of the time switch unit 3, is output, is connected to the input terminal PI1 of the ADPCM transcoder 21. The output terminal PO1 from which the converted data is output is connected to the input terminal TI8 of the time switch unit 3, respectively.

The audio data input terminal AI2 of the ADPCM transcoder 22 is connected to the output terminal TO9 of the time switch unit 3, the output terminal PO2 of the data after rate conversion is connected to the input terminal TI10 of the time switch unit 3, and the time switch unit 3 The output terminal TO10 to which data from the office line input to the input terminal TI5 is output is input to the input terminal PI2 of the ADPCM transcoder 22, and the output terminal PO2 to which the rate-converted data is output is connected to the time switch unit 3. Are connected to the input terminals TI10,.

Further, the output terminal RO3 of the radio interface unit 13 is directly connected to the local line interface unit 43 via the input terminal TI3 and the output terminal TO6 of the time switch unit 3.
Is connected to the input terminal CI3 of the
The output terminal CO3 of the wireless interface unit 13 is directly connected to the input terminal RI3 of the wireless interface unit 13 via the input terminal TI6 of the time switch unit 3 and the output terminal TO3.

In the conventional key telephone apparatus shown in FIG. 2, three ADPCMs required for the radio interface unit are required.
The transcoder has a minimum of two in the embodiment shown in FIG.
Only a single device is required, and only 2/3 is required.

Although the preferred embodiment of the data transfer apparatus of the present invention has been described above, this is merely an example, and it goes without saying that various modifications can be made in accordance with the specific application.

[0041]

As described above, according to the data transfer apparatus of the present invention, the number of ADPCM transcoders for performing rate conversion can be set to the minimum necessary. The configuration is simplified, so that the cost of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a key telephone apparatus to which a data transfer device according to the present invention is applied.

FIG. 2 is a configuration block diagram of a key telephone device to which a conventional data transfer device is applied.

[Explanation of symbols]

 11 to 13 wireless interface unit 21 to 23 ADPCM transcoder 3 time switch unit 41 to 43 office line interface unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI H04Q 7/24 H04Q 7/04 A 7/26 11/04 P 7/30 7/38 11/04 (56) References JP JP-A-7-236178 (JP, A) JP-A-8-168088 (JP, A) JP-A-7-203069 (JP, A) JP-A 8-84102 (JP, A) JP-A-7-87052 (JP) , A) JP-A-9-46311 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04J 3/00-3/26 H04L 29/08 H04M 3/00 H04Q 3/60 H04Q 7/22 H04Q 7/24 H04Q 7/26 H04Q 7/30 H04Q 7/38 H04Q 11/04 JICST file (JOIS)

Claims (7)

(57) [Claims] A rate conversion unit capable of accommodating a plurality of terminal devices capable of transmitting and receiving a plurality of data having different data rates, and performing a data rate conversion between a specific number of radio interface units and a local line interface unit. Wherein the number of the rate conversion units is smaller than the specific number and is 2 or more.
Between the wireless interface unit and the local line interface unit, data that requires rate conversion is sent to the rate conversion unit and the rate-converted data is converted into data that does not require rate conversion. A data transfer device comprising: a switch unit for transmitting data as it is without passing through the rate conversion unit to a corresponding wireless interface unit or a local line interface unit. 2. The data transfer device according to claim 1, wherein said terminal device is a PHS. 3. A wireless communication system, comprising: a predetermined number of PHSs and a radio interface connected by a radio line, for transmitting and receiving data between the radio interface unit and the local line interface unit, and a rate conversion unit for performing data rate conversion from the radio interface. A data transfer apparatus, wherein the number is set to at least two and the rate conversion is performed by the rate conversion unit in accordance with the data content, or without performing the rate conversion without passing through the rate conversion unit. 4. A rate converter, wherein a predetermined number of PHSs and a radio interface are connected by a radio line, and data exchange between the radio interface and the central line interface is performed by a time switch and data rate conversion is performed. Is less than two or more than the wireless interface
And transmitting the data to the rate converter in accordance with the data content via the time switch unit, or directly to the destination without sending the data to the rate converter. Data transfer device. 5. The data transfer device according to claim 3, wherein the time switch unit has a function of converting an analog signal from the central office interface unit into a digital signal. 6. The data transfer device according to claim 2, wherein the data handled by the PHS and the wireless interface unit is audio data of 32 kbps bits and any other digital data. 7. The data transfer device according to claim 1, wherein the data transfer device is applied to a key telephone device.