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Special telephone system

A technology of dedicated telephone and decoding circuit, which is applied in the direction of telephone communication, electrical components, current supply devices, etc., and can solve problems such as cost defects

Inactive Publication Date: 2002-12-18
VICTOR CO OF JAPAN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the line control device generates the above-mentioned reserved tunes and announcements, and in order to output to the LAN, an ADPCM encoding device is required, which causes a disadvantage in cost in the line control device.

Method used

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  • Special telephone system
  • Special telephone system
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Examples

Experimental program
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Embodiment Construction

[0035] Embodiment of the invention

[0036] exist figure 1 Among them, the line control device 401, the line terminals (office line I / F) 101 and 102 connected to the public network 901, and the CS terminals 201 and 202 performing wireless communication between the mobile stations (PS) 301~303 are in the form of a bus Connected on LAN 501. The line control device 401 has call control within the system and management and control of the use status of the line terminals 101, 102, CS terminals 201, 202, and PSs 301-303. Encode data and happen when needed. For the tune-in-reserve, the line control device 401 pre-stores its ADPCM coded data and can occur when needed.

[0037] Voice transmission in the system is entirely performed by ADPCM coded data. Therefore, mobile stations 301 to 303 have ADPCM coder / decoder circuits, and CS terminals 201 and 202 do not have ADPCM coder / decoder circuits. The local line I / F 101, 102 has an ADPCM encoding / decoding circuit when connected to the...

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PUM

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Abstract

PROBLEM TO BE SOLVED: To allow a radio telephone system to produce a voice signal such as various tones or a holding melody with an inexpensive configuration. SOLUTION: A speech within a system is conducted entirely using adaptive PCM (ADPCM) coded data, and each of mobile stations 301-303 has an ADPCM coding / decoding circuit, but cell site(CS) terminals 201, 202 have no ADPCM coding / decoding circuit. A caller side CS terminal outputs an ADPCM code of a dial tone, a ring back tone, and a busy tone to the caller side mobile stations 301-303 and a line controller 401 outputs an ADPCM code of a holding melody.

Description

technical field [0001] The present invention relates to a radiotelephone device using a PHS (Personal Handyphone System) as an extension terminal, and particularly relates to the form of voice signals such as various tones such as dial tone and tunes used in call control. Background of the invention [0002] Figure 5 Indicates an existing wireless telephone device. In this device, under the private branch exchange (PBX) 1000, CS (cell-site) terminals 203, 204 serving as base stations and fixed telephones 800 are arranged in a star shape, and further, under the CS terminals 203, 204, the Mobile station (subset PS) 304,305. In order to perform wireless communication between PSs 304 and 305 in the wireless service area, CS terminals 203 and 204 are arranged in each cell of the divided wireless service area, and perform wired communication with PBX 1000 . Wired communication is performed between fixed telephone 800 and PBX 1000 , and PBX 1000 is connected to public network 90...

Claims

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Application Information

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IPC IPC(8): H04M19/02H04W88/02
Inventor 熊谷伸昭
Owner VICTOR CO OF JAPAN LTD