JPH06104829A - Digital radio telephone system - Google Patents

Digital radio telephone system

Info

Publication number
JPH06104829A
JPH06104829A JP4251269A JP25126992A JPH06104829A JP H06104829 A JPH06104829 A JP H06104829A JP 4251269 A JP4251269 A JP 4251269A JP 25126992 A JP25126992 A JP 25126992A JP H06104829 A JPH06104829 A JP H06104829A
Authority
JP
Japan
Prior art keywords
unit
coding rate
output
section
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4251269A
Other languages
Japanese (ja)
Inventor
Yoshiaki Seguchi
義昭 瀬口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4251269A priority Critical patent/JPH06104829A/en
Publication of JPH06104829A publication Critical patent/JPH06104829A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To considerably improve operability by setting the low power consumption mode when a battery voltage is decreased so as to implement talking continuously without interruption of the talking. CONSTITUTION:A digital radio telephone system is provided with a continuous speech button detection section 13, a coding rate changeover section 14, a variable coding rate voice coding section 17, an output power changeover section 15, a variable coding rate voice decoding section 18, and a coding rate detection section 16 to improve the voice CODEC coding rate when a battery voltage is reduced thereby increasing the processing gain at spread spectrum communication and realizing stable communication with low transmission power. Thus, the power consumption is reduced and the continuous talking is attained even when a battery voltage is decreased.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、バッテリー電圧低下時
においても通話が可能なディジタル無線電話装置に関す
るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital radiotelephone device capable of making a call even when the battery voltage drops.

【0002】[0002]

【従来の技術】近年、いつでも、どこでも電話をかけら
れるセルラー電話装置や、コードレス電話の利用者の急
激な増大に伴い、回線数の不足や、盗聴の問題が無視で
きなくなり、従来のアナログ方式に代わりディジタル方
式が使用されるようになってきた。中でも大幅な回線数
増大と秘話性の高いスペクトラム拡散方式が注目されて
おり、スペクトラム拡散方式を用いたディジタル無線電
話装置が実現されつつある。
2. Description of the Related Art In recent years, with the rapid increase in the number of users of cellular telephone devices and cordless telephones that can make calls anytime, anywhere, the shortage of lines and the problem of eavesdropping cannot be ignored, and the conventional analog system has been adopted. Digital methods have been used instead. Among them, a spread spectrum system, which has a large increase in the number of lines and a high degree of confidentiality, is drawing attention, and a digital wireless telephone device using the spread spectrum system is being realized.

【0003】以下、図面を参照しながら従来のディジタ
ル無線電話装置について説明を行う。
A conventional digital radio telephone device will be described below with reference to the drawings.

【0004】図2は従来のディジタル無線電話装置の構
成を示すブロック図であり、図2において、1はマイク
Mからの音声信号を符号化する音声符号化部、2は入力
された音声信号に疑似雑音コードを乗じてスペクトラム
拡散を行う拡散部、3はディジタル信号を無線周波数に
変調する変調部、4は無線周波数信号の電力を増幅する
電力増幅部、5は送信・受信のアンテナAを切換るアン
テナ切換部である。
FIG. 2 is a block diagram showing a configuration of a conventional digital radio telephone apparatus. In FIG. 2, 1 is a voice encoder for encoding a voice signal from a microphone M, and 2 is an input voice signal. Spreading section for multiplying a pseudo noise code to spread spectrum, 3 a modulation section for modulating a digital signal into a radio frequency, 4 a power amplification section for amplifying the power of a radio frequency signal, 5 a switching antenna A for transmission / reception The antenna switching unit.

【0005】また、6はアンテナから入来する信号を選
択受信する受信部、7は無線周波数信号に含まれる信号
を復調する復調部、8はスペクトラム拡散された信号に
送信側と同じ疑似雑音コードを乗じて符号化音声信号を
出力する逆拡散部、9は音声信号を復号化する音声復号
化部で、スピーカーSから音声信号を出力する。
Further, 6 is a receiving section for selectively receiving a signal coming from an antenna, 7 is a demodulating section for demodulating a signal included in a radio frequency signal, and 8 is a pseudo-noise code for the spread spectrum signal, which is the same as the transmitting side A despreading unit that outputs a coded voice signal by multiplying by, and a voice decoding unit 9 that decodes the voice signal, and outputs the voice signal from the speaker S.

【0006】10は発呼・着呼・通話・バッテリーの電圧
監視等のディジタル無線電話装置を統括制御する制御
部、11はバッテリーの電圧低下を検知する電圧検知部、
12はバッテリーの電圧低下を使用者に通知する電圧低下
通知部である。
Reference numeral 10 is a control unit for integrally controlling a digital radio telephone device such as call origination / incoming call / call / battery voltage monitoring, 11 is a voltage detection unit for detecting a battery voltage drop,
Reference numeral 12 is a voltage drop notification unit that notifies the user of the battery voltage drop.

【0007】以上のように構成された従来のディジタル
無線電話装置について、以下その動作を説明する。
The operation of the conventional digital radiotelephone device configured as described above will be described below.

【0008】本装置の電源はバッテリーにより供給され
ているものとする。
The power supply of this device is assumed to be supplied by a battery.

【0009】マイクMから入力された音声は、音声符号
化部1によりディジタル信号に変換され必要に応じて適
応差動パルス符号変調(ADPCM)手法等により圧縮さ
れる。次に拡散部2で、疑似雑音コードを乗じてスペク
トラム拡散を行う。このスペクトラム拡散された信号
は、変調部3で、所定の周波数の無線信号に変調され
る。この無線信号は、電力増幅部4により所定の電力に
増幅され、アンテナ切換部5を介して、アンテナAに接
続され、他のディジタル無線電話装置と無線結合され
る。
The voice input from the microphone M is converted into a digital signal by the voice encoding unit 1 and is compressed by an adaptive differential pulse code modulation (ADPCM) method or the like as necessary. Next, the spread unit 2 multiplies the pseudo noise code to spread the spectrum. The spread spectrum signal is modulated by the modulator 3 into a radio signal having a predetermined frequency. This radio signal is amplified to a predetermined power by the power amplification unit 4, connected to the antenna A via the antenna switching unit 5, and wirelessly coupled to another digital radio telephone device.

【0010】一方、アンテナAから入来した信号はアン
テナ切換部5を介して受信部6に入力され、所定の信号
が選択され増幅され、復調部7へ入力されスペクトラム
拡散されたディジタル信号に復調される。この復調信号
は逆拡散部8に入力され、送信部と同じ疑似雑音コード
を乗じることによりスペクトラム拡散される前のデータ
を再生する。このデータは音声復号化部9へ入力され音
声信号としてスピーカーSから出力される。
On the other hand, the signal coming from the antenna A is input to the receiving section 6 via the antenna switching section 5, a predetermined signal is selected and amplified, and is input to the demodulation section 7 to be demodulated into a spread spectrum digital signal. To be done. This demodulated signal is input to the despreading unit 8 and is multiplied by the same pseudo noise code as the transmitting unit to regenerate the data before spectrum spreading. This data is input to the voice decoding unit 9 and output from the speaker S as a voice signal.

【0011】次に、本装置の電源を供給しているバッテ
リー(図略)の電圧値が所定の値以下となった場合には、
電圧検知部11によりバッテリーの電圧低下を検知し、そ
の検知出力により制御部10は、使用者に電圧低下を通知
するために、電圧低下通知部12を制御せしめて、例えば
アラーム音を出力する。もし、通話中であればアラーム
音出力の後、回線を切断し通話を終了する。
Next, when the voltage value of the battery (not shown) supplying the power source of the present apparatus becomes a predetermined value or less,
The voltage detection unit 11 detects a voltage drop in the battery, and the control unit 10 controls the voltage drop notification unit 12 to notify the user of the voltage drop based on the detection output, and outputs an alarm sound, for example. If a call is in progress, the line is disconnected after the alarm sound is output and the call is ended.

【0012】[0012]

【発明が解決しようとする課題】しかしながら、上記し
た従来のディジタル無線電話装置では、バッテリー電圧
低下時に、アラーム音出力後、通話中の回線が急に切断
されるという問題点を有していた。
However, the above-described conventional digital radio telephone apparatus has a problem that the line during communication is suddenly disconnected after the alarm sound is output when the battery voltage is low.

【0013】本発明は、バッテリー電圧低下後も継続し
て通話可能なディジタル無線電話装置を提供することを
目的としている。
It is an object of the present invention to provide a digital radiotelephone device which can continuously talk even after the battery voltage drops.

【0014】[0014]

【課題を解決するための手段】本発明は、上記目的を達
成するため、従来装置に、指定により符号化率を可変で
きる可変符号化率音声符号化部と、可変符号化率音声復
号化部と、制御部の指示により可変符号化率音声符号化
部の符号化率を切換る符号化率切換部と、受信された符
号化音声データの符号化率を検出して可変符号化率音声
復号化部の符号化率を切換る符号化率検出部と、制御部
の指示により送信電力を切換る出力電力切換部15を設け
たものである。
In order to achieve the above object, the present invention provides a conventional apparatus with a variable coding rate speech coding unit capable of varying a coding rate according to designation and a variable coding rate speech decoding unit. And a coding rate switching unit for switching the coding rate of the variable coding rate speech coding unit according to an instruction from the control unit, and a variable coding rate speech decoding by detecting the coding rate of the received coded speech data. An encoding rate detecting section that switches the encoding rate of the encoding section and an output power switching section 15 that switches the transmission power according to an instruction from the control section are provided.

【0015】[0015]

【作用】本発明によれば、バッテリー電圧低下後も使用
者が特定のボタンを押下することにより、音声符号化率
を低下させスペクトラム拡散通信の処理利得を向上させ
ることにより、低送信電力での安定した通信を実現する
ことで消費電力の削減が可能となり、バッテリー電圧低
下後も継続して通話が可能となる。
According to the present invention, even after the battery voltage has dropped, the user presses a specific button to reduce the voice coding rate and improve the processing gain of spread spectrum communication, thereby reducing the transmission power. By realizing stable communication, it is possible to reduce power consumption and continue talking even after the battery voltage drops.

【0016】[0016]

【実施例】図1は本発明の一実施例におけるディジタル
無線電話装置の構成を示すブロック図であり、2は拡散
部、3は変調部、4は電力増幅部、5はアンテナ切換
部、6は受信部、7は復調部、8は逆拡散部、11は電圧
検知部、12は電圧低下通知部であり、以上は図2に示し
た従来例のディジタル音声電話装置と同じである。
1 is a block diagram showing the configuration of a digital radio telephone apparatus according to an embodiment of the present invention. 2 is a spreading section, 3 is a modulating section, 4 is a power amplifying section, 5 is an antenna switching section, and 6 is a section. Is a receiving unit, 7 is a demodulating unit, 8 is a despreading unit, 11 is a voltage detecting unit, and 12 is a voltage drop notifying unit. The above is the same as the conventional digital voice telephone device shown in FIG.

【0017】従来例と異なるのは、指定により符号化率
を可変できる可変符号化率音声符号化部17と、可変符号
化率音声復号化部18と、制御部10の指示により可変符号
化率音声符号化部17の符号化率を切換る符号化率切換部
14と、受信された符号化音声データの符号化率を検出し
て可変符号化率音声復号化部18の符号化率を切換る符号
化率検出部16と、制御部10の指示により送信電力を切換
る出力電力切換部15を設けている点である。
The difference from the conventional example is that the variable coding rate speech coding unit 17 whose coding rate can be varied by designation, the variable coding rate speech decoding unit 18, and the variable coding rate according to the instructions of the control unit 10. A coding rate switching unit that switches the coding rate of the voice coding unit 17.
14, a coding rate detection unit 16 that detects the coding rate of the received coded speech data and switches the coding rate of the variable coding rate speech decoding unit 18, and the transmission power according to an instruction from the control unit 10. The point is that an output power switching unit 15 for switching between is provided.

【0018】以上のように構成されたディジタル無線電
話装置について、以下その動作を説明する。
The operation of the digital radiotelephone device configured as described above will be described below.

【0019】本装置の電源はバッテリー(図略)により供
給されているものとする。
The power source of this apparatus is assumed to be supplied by a battery (not shown).

【0020】バッテリー電圧が高い場合は、制御部10に
より、符号化率切換部14は低符号化率(例えば32Kbps)、
出力電力切換部15は通常出力に設定されている。
When the battery voltage is high, the control unit 10 causes the coding rate switching unit 14 to set a low coding rate (for example, 32 Kbps),
The output power switching unit 15 is set to the normal output.

【0021】従来例と同様にして、マイクMから入力さ
れた音声は、可変符号化率音声符号化部17によりディジ
タル信号に変換され、符号化率切換部14で指定される符
号化率(この場合は32Kbps)に圧縮される。次に拡散部2
で、疑似雑音コードを乗じてスペクトラム拡散を行う。
このスペクトラム拡散された信号は、変調部3で、所定
の周波数の無線信号に変調される。この無線信号は、電
力増幅部4により出力電力切換部15で指定される電力
(この場合は通常値)に増幅され、アンテナ切換部5を介
して、アンテナAに接続され、他のディジタル無線電話
装置と無線結合される。
In the same manner as in the conventional example, the voice input from the microphone M is converted into a digital signal by the variable coding rate speech coding section 17, and the coding rate designated by the coding rate switching section 14 (this In this case, it is compressed to 32 Kbps. Next, the diffusion unit 2
Then, spread the spectrum by multiplying the pseudo noise code.
The spread spectrum signal is modulated by the modulator 3 into a radio signal having a predetermined frequency. This radio signal is the power designated by the output power switching unit 15 by the power amplification unit 4.
It is amplified to (normal value in this case), connected to the antenna A through the antenna switching unit 5, and wirelessly coupled to another digital wireless telephone device.

【0022】一方、アンテナAから入来した信号はアン
テナ切換部5を介して受信部6に入力され、所定の信号
が選択され増幅され、復調部7へ入力されスペクトラム
拡散されたディジタル信号に復調される。この復調信号
は逆拡散部8に入力され、送信部と同じ疑似雑音コード
を乗じることによりスペクトラム拡散される前のデータ
を再生する。このデータより符号化率を符号化率検出部
16で検出し、可変符号化率音声復号化部18の符号化率を
指定し、音声信号として復号化し、スピーカーから出力
される。
On the other hand, the signal coming from the antenna A is input to the receiving unit 6 via the antenna switching unit 5, a predetermined signal is selected and amplified, and is input to the demodulating unit 7 to be demodulated into a spread spectrum digital signal. To be done. This demodulated signal is input to the despreading unit 8 and is multiplied by the same pseudo noise code as the transmitting unit to regenerate the data before spectrum spreading. The coding rate is determined from this data by the coding rate detection unit.
It is detected by 16, the coding rate of the variable coding rate speech decoding unit 18 is designated, and the speech is decoded as a speech signal and output from the speaker.

【0023】一般的にスペクトラム拡散通信において、
処理利得(拡散速度/データ速度)が存在し、処理利得が
高いほど妨害に強い。つまり、拡散速度(疑似雑音コー
ドの速度)が一定であれば、データ速度(この場合は可変
符号化率音声符号化部17から出力されるデータの速度)
が遅いほど、つまり音声符号化部の符号化率が高いほど
処理利得が高くなり、同じ送信電力とした際に、より妨
害に対して強くなる。逆に、受ける妨害の程度が同じで
あれば、処理利得を高めることで、送信電力の低減が可
能となる。この送信電力の低減は、大幅な消費電力の削
減を実現できる。
Generally in spread spectrum communication,
There is a processing gain (spreading rate / data rate), and the higher the processing gain, the stronger the interference. That is, if the spreading speed (speed of the pseudo noise code) is constant, the data speed (in this case, the speed of the data output from the variable coding rate speech coding unit 17)
Is slower, that is, the higher the coding rate of the voice coding unit is, the higher the processing gain is, and the more the transmission power is the same, the stronger the interference is. On the contrary, if the degree of interference received is the same, the transmission power can be reduced by increasing the processing gain. This reduction in transmission power can realize a significant reduction in power consumption.

【0024】次に、本装置の電源を供給しているバッテ
リーの電圧値が所定の値以下となった場合には、従来例
と同様にして、電圧検知部11によりバッテリーの電圧低
下を検知し、その検知出力により制御部10は、使用者に
電圧低下に通知するために、電圧低下通知部12を制御せ
しめて、例えばアラーム音を出力する。使用者による継
続通話ボタンの押下が所定時間内に継続通話ボタン検出
部13により検出されない場合は、従来例と同様に通話中
の回線が切断される。
Next, when the voltage value of the battery supplying the power of this device becomes lower than a predetermined value, the voltage detecting unit 11 detects the voltage drop of the battery in the same manner as in the conventional example. The control unit 10 controls the voltage drop notification unit 12 to notify the user of the voltage drop by the detection output, and outputs an alarm sound, for example. When the continuous call button detection unit 13 does not detect the pressing of the continuous call button by the user within a predetermined time, the line during the call is disconnected as in the conventional example.

【0025】所定時間内に継続通話ボタンの押下が検知
された場合、制御部10は、符号化率切換部14を高符号化
率(例えば8Kbps)に設定し処理利得を上げるとともに、
出力電力切換部15を低出力電力に設定することにより、
消費電力を低減させ、バッテリー電圧低下時でも引き続
き、通話を行うことが可能となる。
When it is detected that the continuous call button is pressed within the predetermined time, the control unit 10 sets the coding rate switching unit 14 to a high coding rate (for example, 8 Kbps) to increase the processing gain and
By setting the output power switching unit 15 to a low output power,
The power consumption is reduced, and it becomes possible to continue talking even when the battery voltage drops.

【0026】なお、本実施例では、継続通話ボタンを用
いてバッテリー電圧低下時に符号化率と出力電力を切換
るようにしたが、電圧検知部がバッテリー電圧の低下を
検知した場合に、制御部により自動的に切換るようにし
てもよい。
In this embodiment, the continuous call button is used to switch the coding rate and the output power when the battery voltage drops. However, when the voltage detection unit detects the battery voltage drop, the control unit It is also possible to switch automatically by.

【0027】[0027]

【発明の効果】以上説明したように本発明のディジタル
無線電話装置は、従来のディジタル無線電話装置に継続
通話ボタン検出部,符号化率切換部,可変符号化率音声
符号化部,出力電力切換部,可変符号化率音声復号化
部,符号化率検出部を設けることにより、バッテリー電
圧低下後も、継続して通話をすることができるディジタ
ル無線電話装置を提供することができる。
As described above, the digital radiotelephone device of the present invention is the same as the conventional digital radiotelephone device except that the continuous call button detection unit, the coding rate switching unit, the variable coding rate voice coding unit, and the output power switching unit. By providing the unit, the variable coding rate voice decoding unit, and the coding rate detection unit, it is possible to provide a digital wireless telephone device that can continue a call even after the battery voltage drops.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例におけるディジタル無線電話
装置の構成を示すブロック図である。
FIG. 1 is a block diagram showing a configuration of a digital wireless telephone device according to an embodiment of the present invention.

【図2】従来のディジタル無線電話装置の構成を示すブ
ロック図である。
FIG. 2 is a block diagram showing a configuration of a conventional digital wireless telephone device.

【符号の説明】[Explanation of symbols]

2…拡散部、 3…変調部、 4…電力増幅部、 5…
アンテナ切換部、 6…受信部、 7…復調部、 8…
逆拡散部、 10…制御部、 11…電圧検知部、12…電圧
低下通知部、 13…継続通話ボタン検出部、 14…符号
化率切換部、15…出力電力切換部、 16…符号化率検出
部、 17…可変符号化率音声符号化部、 18…可変符号
化率音声復号化部。
2 ... Spreading unit, 3 ... Modulating unit, 4 ... Power amplifying unit, 5 ...
Antenna switching unit, 6 ... Receiving unit, 7 ... Demodulating unit, 8 ...
Despreading unit, 10 ... control unit, 11 ... voltage detection unit, 12 ... voltage drop notification unit, 13 ... continuous call button detection unit, 14 ... coding rate switching unit, 15 ... output power switching unit, 16 ... coding rate Detecting unit, 17 ... Variable coding rate speech coding unit, 18 ... Variable coding rate speech decoding unit.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 音声信号を符号化する可変符号化率音声
符号化部と、前記可変符号化率音声符号化部の符号化率
を切換る符号化率切換部と、前記可変符号化率音声符号
化部から出力される符号化データを拡散する拡散部と、
前記拡散された信号を無線周波数で変調を行う変調部
と、前記変調部の出力を増幅してアンテナから出力する
電力増幅部と、前記電力増幅部の出力電力を切換る出力
電力切換部と、バッテリーの電圧低下を検知する電圧検
知部と、バッテリーの電圧低下を知らせる電圧低下通知
部と、バッテリーの電圧低下後も引続き通話を希望する
継続押ボタンの押下を検出する継続通話ボタン検出部
と、アンテナから入来する信号を選択増幅する受信部
と、前記受信部の出力を復調する復調部と、前記復調部
の出力を逆拡散する逆拡散部と、前記逆拡散部から出力
された信号の符号化率を検出する符号化率検出部と、前
記逆拡散部の出力信号を前記符号化率検出部で検出され
た符号化率で復号化する可変符号化率音声復号化部と、
前記電圧検知部の出力と前記継続通話ボタン検出部の出
力を入力として前記電圧低下通知部と前記符号化率切換
部と前記出力電力切換部を制御する制御部とを備え、バ
ッテリー電圧低下時において符号化率と出力電力を切換
ることにより継続して通話できることを特徴とするディ
ジタル無線電話装置。
1. A variable coding rate speech coding section for coding a speech signal, a coding rate switching section for switching coding rate of the variable coding rate speech coding section, and the variable coding rate speech. A spreading unit that spreads the encoded data output from the encoding unit,
A modulation unit that modulates the spread signal at a radio frequency, a power amplification unit that amplifies the output of the modulation unit and outputs from the antenna, and an output power switching unit that switches the output power of the power amplification unit, A voltage detection unit that detects a voltage drop of the battery, a voltage drop notification unit that notifies the battery voltage drop, a continuous call button detection unit that detects pressing of the continuous push button that wants to continue talking even after the battery voltage drops, A receiver that selectively amplifies a signal coming from the antenna, a demodulator that demodulates the output of the receiver, a despreader that despreads the output of the demodulator, and a signal output from the despreader. A coding rate detection unit that detects a coding rate, a variable coding rate speech decoding unit that decodes the output signal of the despreading unit at the coding rate detected by the coding rate detection unit,
When the battery voltage drops, the voltage drop notification unit, the coding rate switching unit, and the control unit for controlling the output power switching unit using the output of the voltage detection unit and the output of the continuous call button detection unit as inputs are provided. A digital radiotelephone device capable of continuing a call by switching the coding rate and output power.
JP4251269A 1992-09-21 1992-09-21 Digital radio telephone system Pending JPH06104829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4251269A JPH06104829A (en) 1992-09-21 1992-09-21 Digital radio telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4251269A JPH06104829A (en) 1992-09-21 1992-09-21 Digital radio telephone system

Publications (1)

Publication Number Publication Date
JPH06104829A true JPH06104829A (en) 1994-04-15

Family

ID=17220283

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4251269A Pending JPH06104829A (en) 1992-09-21 1992-09-21 Digital radio telephone system

Country Status (1)

Country Link
JP (1) JPH06104829A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001251668A (en) * 2000-03-02 2001-09-14 Canon Inc Cordless phone terminal and its communication control method
KR100357014B1 (en) * 1999-06-15 2002-10-19 닛본 덴기 가부시끼가이샤 Mobile terminal, mobile communication system, and power consumption suppressing method for mobile terminal
US6868257B1 (en) 1999-07-05 2005-03-15 Nokia Networks Oy Method for selection of coding method
JP2014116681A (en) * 2012-12-06 2014-06-26 Nippon Hoso Kyokai <Nhk> Data transmission device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100357014B1 (en) * 1999-06-15 2002-10-19 닛본 덴기 가부시끼가이샤 Mobile terminal, mobile communication system, and power consumption suppressing method for mobile terminal
US6868257B1 (en) 1999-07-05 2005-03-15 Nokia Networks Oy Method for selection of coding method
US7778272B2 (en) 1999-07-05 2010-08-17 Nokia Corporation Method for a mobile station to select an uplink coding mode
JP2001251668A (en) * 2000-03-02 2001-09-14 Canon Inc Cordless phone terminal and its communication control method
JP2014116681A (en) * 2012-12-06 2014-06-26 Nippon Hoso Kyokai <Nhk> Data transmission device

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