JP2848143B2 - Wireless telephone - Google Patents
Wireless telephoneInfo
- Publication number
- JP2848143B2 JP2848143B2 JP4207667A JP20766792A JP2848143B2 JP 2848143 B2 JP2848143 B2 JP 2848143B2 JP 4207667 A JP4207667 A JP 4207667A JP 20766792 A JP20766792 A JP 20766792A JP 2848143 B2 JP2848143 B2 JP 2848143B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- warning sound
- receiving circuit
- line quality
- output
- 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は無線電話機に関し、特に
デジタル通信方式の無線電話機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio telephone, and more particularly to a digital communication radio telephone.
【０００２】[0002]
【従来の技術】従来、この種の無線電話機には、音声
（アナログ信号）をデジタル信号に変換する又はデジタ
ル信号を音声（アナログ信号）に変換する機能を有する
符号復号器（ＣＯＤＥＣ）が使用されている。この符号
復号器（ＣＯＤＥＣ）にはサンプル時間点での瞬時電圧
をコード化する方式（ＰＣＭ方式）や、サンプル時間点
毎の差分をコード化する方式（△Ｍ方式）などが使われ
ていた。しかし、近年に関して、音声信号に限り、さら
に音声信号の特徴成分のみをコード化する音声符号復号
器（以下ＳＰ ＣＯＤＥＣ）が使用されてきている。2. Description of the Related Art Conventionally, a codec (CODEC) having a function of converting a voice (analog signal) into a digital signal or a function of converting a digital signal into a voice (analog signal) is used in this type of wireless telephone. ing. The codec (CODEC) uses a method of coding an instantaneous voltage at a sample time point (PCM method), a method of coding a difference at each sample time point (ΔM method), and the like. However, in recent years, an audio codec (hereinafter, referred to as SP CODEC) has been used that encodes only a characteristic component of an audio signal, in addition to an audio signal.
【０００３】従来のデジタル通信方式の無線電話機の構
成の一例を図４に示す。FIG. 4 shows an example of a configuration of a conventional digital communication type radio telephone.
【０００４】図４において、受信回路９は、通信電波の
被変調信号を受信し、周波数変換及び復調を行い、受信
データ信号９−１を出力する。復調信号受信回路１２は
受信データ信号９−１を受け、復号音声信号をＳＰ Ｃ
ＯＤＥＣ５へ出力する。ＳＰＣＯＤＥＣ５は復調信号回
路１２が出力するデジタル信号を復号し、アナログ信号
に変換した後に、レシーバ６へ可聴信号として出力す
る。In FIG. 4, a receiving circuit 9 receives a modulated signal of a communication radio wave, performs frequency conversion and demodulation, and outputs a received data signal 9-1. Demodulated signal receiving circuit 12 receives received data signal 9-1 and converts the decoded audio signal to SP C
Output to ODEC5. The SPCODEC 5 decodes the digital signal output from the demodulation signal circuit 12, converts the signal into an analog signal, and outputs the analog signal to the receiver 6 as an audible signal.
【０００５】[0005]
【発明が解決しようとする課題】この従来の無線電話機
は、ＰＣＭ ＣＯＤＥＣ方式を使用した場合、信号の誤
りと復号波形間に相関があるため、ＰＣＭ ＣＯＤＥＣ
を採用した無線電話機のユーザは、無線回線品質の劣化
を耳で聞き取ることができるので、劣化に応じてユーザ
の意志で通話を保持か終話か選択可能であった。In this conventional radio telephone, when the PCM CODEC system is used, there is a correlation between a signal error and a decoded waveform.
The user of a wireless telephone adopting the method can hear the deterioration of the radio line quality by ear, so that the user can select whether to hold or end the call according to the deterioration.
【０００６】しかし、近年、無線区間での伝送レートを
引き下げ、変調占有帯域幅を狭める目的で、伝送情報に
関して音声信号に限り、さらに音声信号の特徴成分のみ
をコード化する音声符号復号器（ＳＰ ＣＯＤＥＣ）が
無線電話機に使用された場合には、信号圧縮率が高いだ
けに無線回線でコードエラーが発生した場合、復号後の
音声再現性は極端に劣化することがあり、そこで一般に
この種のＳＰ ＣＯＤＥＣを採用する場合には、符号器
データ出力に誤り検出、訂正符号を追加して、伝送路の
品質を確保する方式が取られてきた。However, in recent years, for the purpose of lowering the transmission rate in the radio section and narrowing the modulation occupied bandwidth, the audio codec (SP) which encodes only the audio signal and further only the characteristic component of the audio signal with respect to the transmission information. When codec (CODEC) is used in a wireless telephone, if a code error occurs on a wireless line due to a high signal compression rate, the sound reproducibility after decoding may be extremely deteriorated. In the case of adopting the SP CODEC, a method has been adopted in which error detection and correction codes are added to the encoder data output to ensure the quality of the transmission path.
【０００７】一般には、誤り検出能力の方が訂正能力よ
り高いため、伝送路上の信号誤りが訂正能力以内であれ
ば復号器には正しく訂正された信号が入力されるが、一
方信号誤りが増加した場合は誤り検出機能のみ働き、不
良コードは廃棄され、復号器には入力されないように
し、あるいは復調出力信号にミュートをかけて止める。In general, since the error detection capability is higher than the correction capability, if the signal error on the transmission path is within the correction capability, a correctly corrected signal is input to the decoder, but the signal error increases. In this case, only the error detection function operates, the defective code is discarded, and is not input to the decoder, or the demodulated output signal is muted and stopped.
【０００８】従って、従来の無線電話機は、無線回線の
品質が劣化してくると、ある劣化状態までは全く正常な
音声をユーザが聞くことができるが、さらにエラーが増
えてくると、突然回線断（無音）状態となってしまうた
め、ユーザが戸惑うとともに不快感をおぼえるという問
題点があった。Therefore, in the conventional radio telephone, when the quality of the radio line is degraded, the user can hear completely normal voice until a certain degraded state. There is a problem in that the user is confused and uncomfortable because the user is cut off (silent).
【０００９】[0009]
【課題を解決するための手段】本第１の発明の無線電話
機は、通信電波の被変調信号を受信して復調する受信回
路と、基準信号を発振する基準信号発振器とを備え、前
記受信回路の出力と前記基準発振器からの前記基準信号
との位相差の変動分から回線品質を算出する回線品質検
出手段と、前記受信回路から通信の復調信号を受信する
共に前記回線品質検出手段から出力する回線品質情報信
号が予め決められた値を下回った場合に警告音信号デー
タを出力する警告音信号データ出力手段と、前記警告音
信号データをアナログ信号に復号変換して警告音を出力
する警告音出力手段とを有している。According to a first aspect of the present invention, there is provided a wireless telephone comprising a receiving circuit for receiving and demodulating a modulated signal of a communication radio wave, and a reference signal oscillator for oscillating a reference signal. Line quality detecting means for calculating line quality from a variation in phase difference between the output of the reference oscillator and the reference signal from the reference oscillator, and a line for receiving a demodulated signal of communication from the receiving circuit and outputting the signal from the line quality detecting means. Warning sound signal data output means for outputting warning sound signal data when the quality information signal falls below a predetermined value; and warning sound output for decoding and converting the warning sound signal data into an analog signal and outputting a warning sound. Means.
【００１０】[0010]
【００１１】本第２の発明の無線電話機は、通信電波の
被変調信号を受信して復調すると共に前記被変調信号の
電界強度に比例した電界強度信号を出力する受信回路
と、基準信号を発振する基準信号発振器とを備え、前記
受信回路の出力と前記基準発振器からの前記基準信号と
の位相差の変動分から回線品質を算出する回線品質検出
手段と、前記受信回路から通信の復調信号を受信すると
共に前記回線品質検出手段からの回線品質情報が予め決
められた値を下回った場合、又は、前記電界強度信号が
予め決められた電界強度値より下回った場合に警告音信
号データを出力する警告音信号データ出力手段と、前記
警告音信号をアナログ信号に復調変換して警告音を出力
する警告音出力手段とを有している。According to a second aspect of the present invention, there is provided a wireless telephone which receives and demodulates a modulated signal of a communication radio wave and outputs an electric field intensity signal proportional to the electric field intensity of the modulated signal, and oscillates a reference signal. A reference signal oscillator, a line quality detecting means for calculating a line quality from a variation of a phase difference between an output of the receiving circuit and the reference signal from the reference oscillator, and receiving a demodulated signal of communication from the receiving circuit. And outputting a warning sound signal data when the line quality information from the line quality detecting means falls below a predetermined value, or when the electric field intensity signal falls below a predetermined electric field intensity value. A sound signal data output unit; and a warning sound output unit for demodulating and converting the warning sound signal into an analog signal and outputting a warning sound.
【００１２】[0012]
【実施例】次に、本発明について図面を参照して説明す
る。Next, the present invention will be described with reference to the drawings.
【００１３】図１は本第１の発明の一実施例を示すブロ
ック図である。FIG. 1 is a block diagram showing an embodiment of the first invention.
【００１４】図１において、本実施例は通信電波の被変
調信号を受信し周波数変換して中間周波信号１−１を出
力する受信回路１と、基準信号３−１を出力する基準発
振器３と、中間周波信号１−１と基準信号３−１とを比
較しこの二つの信号の位相差分から回線品質情報２−１
を出力する回線品質検出回路２と、復調した音声信号と
回線品質情報信号２−１とを受信する復調信号受信回路
４と、ＳＰ ＣＯＤＥＣ５と、レシーバ６とを有して構
成している。In FIG. 1, a receiving circuit 1 receives a modulated signal of a communication radio wave, converts the frequency, and outputs an intermediate frequency signal 1-1, and a reference oscillator 3 outputs a reference signal 3-1. , The intermediate frequency signal 1-1 and the reference signal 3-1 are compared, and the line quality information 2-1 is obtained from the phase difference between the two signals.
, A demodulated signal receiving circuit 4 for receiving a demodulated audio signal and a channel quality information signal 2-1, an SP CODEC 5, and a receiver 6.
【００１５】次に本実施例の動作について説明する。Next, the operation of this embodiment will be described.
【００１６】受信回路１は通信電波の被変調信号を受信
し、周波数変換して中間周波信号１−１を出力する。回
線品質検出回路２は中間周波信号１−１と、基準発振器
３から出力された基準信号３−１とを比較し、二つの信
号の位相差の変動分から回線品質を検出し、回線品質情
報信号２−１として出力する。復調信号受信回路４は回
線品質情報信号２−１を受け、その値が予め決められた
値を下回った場合には、ＳＰ ＣＯＤＥＣ５に復号音声
信号の代わりに、又は復号音声信号に重量して警告音信
号データを送る。ＳＰ ＣＯＤＥＣ５は復調信号受信回
路４が出力する警告音信号データのデジタル信号を復号
し、アナログ信号に変換した後に、レシーバ６へ可聴信
号として出力する。The receiving circuit 1 receives a modulated signal of a communication radio wave, converts the frequency, and outputs an intermediate frequency signal 1-1. The line quality detection circuit 2 compares the intermediate frequency signal 1-1 with the reference signal 3-1 output from the reference oscillator 3, detects the line quality from the variation of the phase difference between the two signals, and outputs a line quality information signal. Output as 2-1. The demodulated signal receiving circuit 4 receives the line quality information signal 2-1 and, if the value falls below a predetermined value, warns the SP CODE 5 instead of or in addition to the decoded audio signal. Sends sound signal data. The SP CODEC 5 decodes the digital signal of the warning sound signal data output from the demodulated signal receiving circuit 4, converts the digital signal to an analog signal, and outputs the analog signal to the receiver 6 as an audible signal.
【００１７】図２は本第２の発明の一実施例を示すブロ
ック図である。FIG. 2 is a block diagram showing an embodiment of the second invention.
【００１８】図２において、本実施例は通信電波の被変
調信号を受信し、周波数変換及び検波し、電界強度信号
（ＲＳＳＩ）７−１を取り出す受信回路１と、電界強度
信号（ＲＳＳＩ）７−１を受け、その値が予め決められ
た値以下の場合に警告音信号データを出力する復調信号
受信回路１０と、ＳＰ ＣＯＤＥＣ５と、レシーバ６と
を有して構成している。In FIG. 2, this embodiment receives a modulated signal of a communication radio wave, performs frequency conversion and detection, and extracts a field strength signal (RSSI) 7-1, and a field strength signal (RSSI) 7. The demodulation signal receiving circuit 10 outputs the warning sound signal data when the value is equal to or smaller than a predetermined value, the SP CODEC 5, and the receiver 6.
【００１９】次に、本実施例の動作について説明する。Next, the operation of this embodiment will be described.
【００２０】受信回路７は、被変調信号を受信し、周波
数変換及び検波し、電界強度信号（ＲＳＳＩ）７−１を
取り出して、その信号を復調信号受信回路１０へ出力す
る。復調信号受信回路１０は電界強度信号（ＲＳＳＩ）
７−１を受け、その値が予め決められた値を下回った場
合に警告音信号データを出力する。ＳＰ ＣＯＤＥＣ５
は警告音信号データをアナログ信号に変換した後、レシ
ーバ６へ可聴信号として出力する。The receiving circuit 7 receives the modulated signal, performs frequency conversion and detection, extracts an electric field strength signal (RSSI) 7-1, and outputs the signal to the demodulated signal receiving circuit 10. The demodulated signal receiving circuit 10 receives a field strength signal (RSSI)
In response to 7-1, when the value falls below a predetermined value, warning sound signal data is output. SP CODEC5
Converts the warning sound signal data into an analog signal, and outputs it to the receiver 6 as an audible signal.
【００２１】図３は本第３の発明の一実施例を示すブロ
ック図図３において、本実施例は上述の第１，第２の発
明の各実施例を併合した場合を示し、上記各実施例と同
じ構成要件には同じ番号が付与されてあり、受信回路８
は受信回路１と受信回路７との併合機能を有し、復調信
号受信回路１１は復調信号受信回路４と復調信号受信回
路１０とを併合した機能を有している。FIG. 3 is a block diagram showing an embodiment of the third invention. In FIG. 3, this embodiment shows a case where the above-described embodiments of the first and second inventions are combined. The same numbers are given to the same components as in the example, and the receiving circuit 8
Has a function of combining the receiving circuit 1 and the receiving circuit 7, and the demodulated signal receiving circuit 11 has a function of combining the demodulated signal receiving circuit 4 and the demodulated signal receiving circuit 10.
【００２２】次に、本実施例の動作について説明する。Next, the operation of this embodiment will be described.
【００２３】復調信号受信回路１１は受信回路８から電
界強度信号（ＲＳＳＩ）８−１及び回線品質検出回路２
から回線品質情報信号２−１を受信し、それらの各値の
内どちらか一方でも予め決められた値を下回った場合、
警告音信号データをし出力する。ＳＰ ＣＯＤＥＣ５は
復調信号受信回路１１が出力する警告音信号データのデ
ジタル信号を復号し、アナログ信号に変換した後に、レ
シーバ６へ可聴信号として出力する。The demodulated signal receiving circuit 11 receives an electric field strength signal (RSSI) 8-1 and a line quality detecting circuit 2 from the receiving circuit 8.
And if any one of these values falls below a predetermined value,
Output and output warning sound signal data. The SP CODEC 5 decodes the digital signal of the warning sound signal data output from the demodulated signal receiving circuit 11, converts the digital signal into an analog signal, and outputs the analog signal to the receiver 6 as an audible signal.
【００２４】[0024]
【発明の効果】以上説明したように本発明は、使用中
（通話中）に、回線品質又は、電界強度を検出し、その
情報をもとに、無線回線品質の劣化を警告音として出力
するように構成することにより、ユーザは通話中無線回
線品質の劣化の状態を直接耳で聞き取ることができ、そ
の劣化に応じてユーザの意志で通話を保持か終結か選択
できることが可能となり、回線断（無音）状態になって
も戸惑うことがなくなり、ユーザに対して不快感をなく
すことができるという効果を有する。As described above, according to the present invention, the line quality or the electric field strength is detected during use (during a call), and the deterioration of the radio line quality is output as a warning sound based on the information. With such a configuration, the user can directly hear the state of deterioration of the radio line quality during a call, and according to the deterioration, it is possible to select whether to hold or terminate the call at the user's will. There is an effect that the user is not confused even in the (silent) state, and can eliminate discomfort to the user.
【図１】本第１の発明の一実施例を示すブロック図であ
る。FIG. 1 is a block diagram showing an embodiment of the first invention.
【図２】本第２の発明の一実施例を示すブロック図であ
る。FIG. 2 is a block diagram showing an embodiment of the second invention.
【図３】本第３発明の一実施例を示すブロック図であ
る。FIG. 3 is a block diagram showing an embodiment of the third invention.
【図４】従来のデジタル通信方式の無線電話機の一例を
示すブロック図である。FIG. 4 is a block diagram showing an example of a conventional digital communication type wireless telephone.
１ 受信回路 ２ 回線品質検出回路 ３ 基準発信器 ４ 復調信号受信回路 ５ 音声符号復号器（ＳＰ ＣＯＤＥＣ） ６ レシーバ ７，８，９ 受信回路 １０，１１，１２ 復調信号受信回路 DESCRIPTION OF SYMBOLS 1 Receiving circuit 2 Line quality detecting circuit 3 Reference oscillator 4 Demodulated signal receiving circuit 5 Speech codec (SP CODEC) 6 Receiver 7, 8, 9 Receiving circuit 10, 11, 12 Demodulated signal receiving circuit
Claims (2)
る受信回路と、基準信号を発振する基準信号発振器とを
備え、前記受信回路の出力と前記基準発振器からの前記
基準信号との位相差の変動分から回線品質を算出する回
線品質検出手段と、前記受信回路から通信の復調信号を
受信する共に前記回線品質検出手段から出力する回線品
質情報信号が予め決められた値を下回った場合に警告音
信号データを出力する警告音信号データ出力手段と、前
記警告音信号データをアナログ信号に復号変換して警告
音を出力する警告音出力手段とを有することを特徴とす
る無線電話機。1. A receiving circuit for receiving and demodulating a modulated signal of a communication radio wave, and a reference signal oscillator for oscillating a reference signal, wherein a position of an output of the receiving circuit and a reference signal from the reference oscillator are compared. Line quality detection means for calculating the line quality from the variation of the phase difference, and when the line quality information signal output from the line quality detection means while receiving a demodulated signal of communication from the receiving circuit is less than a predetermined value A radio telephone comprising: a warning sound signal data output unit that outputs warning sound signal data; and a warning sound output unit that decodes and converts the warning sound signal data into an analog signal and outputs a warning sound.
ると共に前記被変調信号の電界強度に比例した電界強度
信号を出力する受信回路と、基準信号を発振する基準信
号発振器とを備え、前記受信回路の出力と前記基準発振
器からの前記基準信号との位相差の変動分から回線品質
を算出する回線品質検出手段と、前記受信回路から通信
の復調信号を受信すると共に前記回線品質検出手段から
の回線品質情報が予め決められた値を下回った場合、又
は、前記電界強度信号が予め決められた電界強度値より
下回った場合に警告音信号データを出力する警告音信号
データ出力手段と、前記警告音信号をアナログ信号に復
調変換して警告音を出力する警告音出力手段とを有する
ことを特徴とする無線電話機。2. A receiving circuit for receiving and demodulating a modulated signal of a communication radio wave and outputting an electric field intensity signal proportional to the electric field intensity of the modulated signal, and a reference signal for oscillating a reference signal.
And an output of the receiving circuit and the reference oscillation.
Line quality from the variation of the phase difference from the reference signal from the
Communication quality from the receiving circuit
From the line quality detection means
If the line quality information of the
Is higher than a predetermined electric field intensity value.
Warning sound signal to output warning sound signal data when it falls below
Data output means for converting the warning sound signal into an analog signal
And a warning sound output means for outputting a warning sound after tone conversion .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4207667A JP2848143B2 (en) | 1992-08-04 | 1992-08-04 | Wireless telephone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4207667A JP2848143B2 (en) | 1992-08-04 | 1992-08-04 | Wireless telephone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0661938A JPH0661938A (en) | 1994-03-04 |
| JP2848143B2 true JP2848143B2 (en) | 1999-01-20 |
Family
ID=16543568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4207667A Expired - Fee Related JP2848143B2 (en) | 1992-08-04 | 1992-08-04 | Wireless telephone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2848143B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005086586A (en) | 2003-09-10 | 2005-03-31 | Nec Corp | Portable telephone, electric field display method used for the same, and its program |
| US8600325B2 (en) * | 2010-04-09 | 2013-12-03 | Harris Corporation | Simulated degradation of SNR in decoded digital audio correlated to wireless link bit-error rate |
-
1992
- 1992-08-04 JP JP4207667A patent/JP2848143B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0661938A (en) | 1994-03-04 |
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| Date | Code | Title | Description |
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| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19981006 |
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| LAPS | Cancellation because of no payment of annual fees |