JPH0648802B2 - Out-of-range notification circuit of wireless telephone device - Google Patents
Out-of-range notification circuit of wireless telephone deviceInfo
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- JPH0648802B2 JPH0648802B2 JP1259341A JP25934189A JPH0648802B2 JP H0648802 B2 JPH0648802 B2 JP H0648802B2 JP 1259341 A JP1259341 A JP 1259341A JP 25934189 A JP25934189 A JP 25934189A JP H0648802 B2 JPH0648802 B2 JP H0648802B2
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- detection circuit
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- signal
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Description
【発明の詳細な説明】 (イ)産業上の利用分野 本発明は無線電話装置の通話圏外報知回路に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an out-of-coverage area notification circuit of a wireless telephone device.
(ロ)従来の技術 従来、無線電話装置では、所定の通話品質を確保するた
めに、移動局が前記通話品質を維持できる範囲（以下、
通話圏と称す）の限界近傍に達した際、警報音等により
使用者に報知するようになされている。(B) Conventional technology Conventionally, in a wireless telephone device, in order to ensure a predetermined call quality, a range in which the mobile station can maintain the call quality (hereinafter,
When it reaches near the limit of the call range), the user is informed by an alarm sound or the like.
此種従来の無線電話装置の受信系としては、第５図に示
すものが知られている。As a receiving system of this type of conventional wireless telephone device, the one shown in FIG. 5 is known.
第５図において、(1)は受信アンテナ、(2)は受信アンテ
ナ(1)からの高周波信号を増幅する高周波増幅回路、(3)
は高周波増幅回路(2)からの高周波信号と局部発振回路
(4)からの局部発振信号とを混合し、所定の中間周波信
号を導出する混合回路、(5)は混合回路(3)からの中間周
波信号を増幅する中間周波増幅回路、(6)は中間周波増
幅回路(5)からの中間周波信号を検波する検波回路、(7)
は低周波増幅回路、(8)はスピーカ、(9)は検波回路(6)
の出力端に接続された雑音検出回路で、音声帯域の上方
の周波数（例えば、８〜１０ＫHz）を中心周波数とする
バンドパスフィルタ（ＢＰＦ）(10)と、このＢＰＦ(10)
を通過した信号を整流する整流回路(11)とより構成され
ている。(12)は整流回路(11)からの整流出力が反転入力
端子に、可変抵抗器(13)にて設定された基準電圧が非反
転入力端子に夫々供給される比較器、(14)は無線電話装
置の各種動作を司る、マイクロコンピュータよりなる制
御回路で、比較器(12)からの出力信号がＬレベルとなっ
たとき、スピーカ等よりなる報知回路(15)へ駆動信号を
供給するようになされている。尚、報知回路(15)は音声
報知だけでなく、表示器等による視覚報知又は両者の組
合せを用いることが可能である。In FIG. 5, (1) is a receiving antenna, (2) is a high frequency amplifier circuit for amplifying a high frequency signal from the receiving antenna (1), (3)
Is the high frequency signal from the high frequency amplifier circuit (2) and the local oscillator circuit
A mixing circuit that mixes the local oscillation signal from (4) to derive a predetermined intermediate frequency signal, (5) is an intermediate frequency amplifier circuit that amplifies the intermediate frequency signal from the mixing circuit (3), and (6) is Detection circuit that detects the intermediate frequency signal from the intermediate frequency amplification circuit (5), (7)
Is a low frequency amplification circuit, (8) is a speaker, ( 9 ) is a detection circuit (6)
A noise detection circuit connected to the output end of the band pass filter (BPF) (10) whose center frequency is a frequency above the voice band (for example, 8 to 10 KHz), and this BPF (10)
It is composed of a rectifying circuit (11) for rectifying the signal that has passed through. (12) is a comparator in which the rectified output from the rectifier circuit (11) is supplied to the inverting input terminal and the reference voltage set by the variable resistor (13) is supplied to the non-inverting input terminal, and (14) is a wireless A control circuit composed of a microcomputer for controlling various operations of the telephone device, so that when the output signal from the comparator (12) becomes L level, a drive signal is supplied to the notification circuit (15) composed of a speaker or the like. Has been done. Note that the notification circuit (15) can use not only audio notification but also visual notification by a display or the like or a combination of both.
受信入力レベルに対する信号及びノイズの特性は、一般
に第６図(a)に示す如く変化するため、比較器(12)の非
反転入力端子に供給される基準電圧を第６図(b)の受信
入力レベルＡにおけるノイズレベルに相当する電圧値に
設定しておけば、移動局が基地局から遠ざかることに応
じて受信入力レベルが低下し、前記基準電圧以下となる
と、比較器(12)の出力がＬレベルとなり（第６図(c)参
照）、これに応じて制御回路(14)が駆動信号を出力し
て、例えばスピーカを鳴動し、以って通話圏外の報知を
行なう。Since the characteristics of signal and noise with respect to the reception input level generally change as shown in Fig. 6 (a), the reference voltage supplied to the non-inverting input terminal of the comparator (12) is received in Fig. 6 (b). If the voltage value corresponding to the noise level at the input level A is set, the reception input level will decrease as the mobile station moves away from the base station, and if the voltage falls below the reference voltage, the output of the comparator (12). Becomes L level (see FIG. 6 (c)), and in response to this, the control circuit (14) outputs a drive signal and sounds a speaker, for example, to notify the outside of the communication range.
(ハ)発明が解決しようとする課題 上記従来の技術に依れば、検波出力信号中に含まれる雑
音成分のレベルのみにて通話圏外検出を行うため誤動作
を生じる惧れがあった。(C) Problem to be Solved by the Invention According to the above-described conventional technique, there is a possibility that malfunction may occur because out-of-coverage range detection is performed only by the level of the noise component included in the detection output signal.
即ち、送信信号の変調度が高い場合、受信系の中間周波
増幅回路における移相歪が生じ、結果として検波した後
の受信信号の高調波成分（変調周波数の２次又は３次高
調波成分）が増加する（第６図(d)参照）。That is, when the modulation degree of the transmission signal is high, phase shift distortion occurs in the intermediate frequency amplifier circuit of the reception system, and as a result, the harmonic component of the received signal after detection (second or third harmonic component of the modulation frequency) Increases (see FIG. 6 (d)).
従って、受信入力レベルが高い場合であっても、変調度
が高いと、前記高調波成分がＢＰＦ(10)にて抽出され、
そのレベルが基準電圧を越えると、比較器(12)の出力が
Ｌレベルとなり（第６図(e)参照）、制御回路(14)は受
信入力レベルが低下したと誤って判定してしまうという
問題を生じるものであった。Therefore, even if the reception input level is high, if the modulation degree is high, the harmonic component is extracted by the BPF (10),
When the level exceeds the reference voltage, the output of the comparator (12) becomes L level (see FIG. 6 (e)), and the control circuit (14) erroneously determines that the reception input level has decreased. It caused problems.
(ニ)課題を解決するための手段 上記の点に鑑み、本発明は無線電話装置の受信系に設け
られ且つ該受信系にて受信された信号のレベルを示す直
流信号を出力する信号強度検出回路と、無線電話装置の
受信系に設けられ且つ該受信系にて受信・復調された信
号に含まれる雑音成分のレベルを示す直流信号を出力す
る雑音検出回路と、前記信号強度検出回路からの出力及
び雑音検出回路からの出力に応じて通話圏外検出信号を
出力する通話圏外検出回路と、該通話圏外検出回路から
の出力に基づき駆動される報知回路とを具備したことを
特徴とする。(D) Means for Solving the Problems In view of the above points, the present invention provides a signal strength detection which is provided in a reception system of a wireless telephone device and outputs a DC signal indicating the level of a signal received by the reception system. A circuit, a noise detection circuit provided in a reception system of the radiotelephone device, for outputting a DC signal indicating the level of a noise component included in a signal received and demodulated by the reception system, and a noise detection circuit from the signal strength detection circuit. It is characterized by comprising an out-of-communication range detection circuit that outputs an out-of-communication range detection signal in accordance with an output and an output from the noise detection circuit, and a notification circuit driven based on the output from the out-of-communication range detection circuit.
また、前記通話圏外検出回路が、一方の入力端子に雑音
検出回路の直流出力が供給され、他方の入力端子に所定
電位点と信号強度検出回路の出力端間に接続された抵抗
にて分圧された電圧が供給される比較器を備えているこ
とを特徴とする。Further, in the out-of-communication range detection circuit, one input terminal is supplied with the DC output of the noise detection circuit, and the other input terminal is divided by a resistor connected between a predetermined potential point and the output end of the signal strength detection circuit. It is characterized in that it comprises a comparator to which the generated voltage is supplied.
更に、前記通話圏外検出回路が、一方の入力端子に雑音
検出回路の直流出力が供給され、他方の入力端子に分圧
抵抗にて分圧された基準電圧が供給される比較器と、前
記分圧抵抗の少なくとも１つと並列に接続され、前記信
号強度検出回路の直流出力にて導通制御される半導体ス
イッチング素子を備えていることを特徴とする。Further, the out-of-communication range detection circuit includes a comparator to which the DC output of the noise detection circuit is supplied to one input terminal and a reference voltage divided by a voltage dividing resistor is supplied to the other input terminal, and the comparator. It is characterized by comprising a semiconductor switching element which is connected in parallel with at least one of the piezoresistors and whose conduction is controlled by the DC output of the signal strength detection circuit.
更にまた、前記通話圏外検出回路が、一方の入力端子に
雑音検出回路の直流出力が供給され、他方の入力端子に
第１基準電圧が供給される第１比較器と、一方の入力端
子に信号強度検出回路の直流出力が供給され、他方の入
力端子に第２の基準電圧が供給される第２比較器と、第
１及び第２比較器の出力が供給されたＯＲ回路とを備え
ていることを特徴とする。Furthermore, the out-of-range detection circuit has a first comparator to which the DC output of the noise detection circuit is supplied to one input terminal and a first reference voltage is supplied to the other input terminal, and a signal to one input terminal. It is provided with a second comparator to which the DC output of the intensity detection circuit is supplied and the second reference voltage is supplied to the other input terminal, and an OR circuit to which the outputs of the first and second comparators are supplied. It is characterized by
(ホ)作用 本発明に依れば、信号強度検出回路からの受信信号レベ
ルを示す直流信号と雑音検出回路からの雑音成分のレベ
ルを示す直流信号とに応じて通話圏外報知信号を出力す
る。例えば、受信信号レベルに応じて雑音検出レベルを
変化させることにより高精度の通話圏外報知信号を作成
することができる。(E) Operation According to the present invention, the out-of-call area notification signal is output according to the DC signal indicating the received signal level from the signal strength detection circuit and the DC signal indicating the noise component level from the noise detection circuit. For example, a highly accurate out-of-call notification signal can be created by changing the noise detection level in accordance with the received signal level.
(ヘ)実施例 第１図は本発明の一実施例を示す図で、第５図と同一部
分には同一符号を付すと共にその説明を省略する。(F) Embodiment FIG. 1 is a diagram showing an embodiment of the present invention. The same parts as those in FIG. 5 are designated by the same reference numerals and the description thereof will be omitted.
第１図において、(16)は中間周波増幅回路(5)からの中
間周波信号が供給され、当該中間周波信号を整流するこ
とにより受信信号レベルに比例した直流信号を出力する
信号強度検出回路、(17)は雑音検出回路(9)からの直流
信号と信号強度検出回路(16)からの直流信号とに応じて
通話圏外検出信号を出力する通話圏外検出回路で、雑音
検出回路(9)からの直流信号が反転入力端子に、電源(+
B)と信号強度検出回路(16)の出力端との間に接続された
可変抵抗器(18)の摺動子からの直流電圧が非反転入力端
子に夫々供給される比較器(19)にて構成されている。In FIG. 1, (16) is a signal strength detection circuit which is supplied with the intermediate frequency signal from the intermediate frequency amplifier circuit (5) and which rectifies the intermediate frequency signal to output a DC signal proportional to the received signal level, (17) in the call service area detection circuit for outputting a call out-of-range detection signal in response to the DC signal from the DC signal and the signal strength detection circuit (16) from the noise detection circuit (9), from the noise detection circuit (9) The DC signal of the
DC voltage from the slider of the variable resistor (18) connected between B) and the output terminal of the signal strength detection circuit (16) is supplied to the comparators (19) which are supplied to the non-inverting input terminals respectively. Is configured.
さて、信号強度検出回路(16)からの出力信号は、受信入
力レベルの変動に対して第２図(b)の一点鎖線の如く変
化するので、この直流信号と電源(+B)とを分圧した電圧
は第２図(b)の破線の如く変化する。Now, since the output signal from the signal strength detection circuit (16) changes as shown by the alternate long and short dash line in Fig. 2 (b) with respect to the fluctuation of the received input level, this DC signal is separated from the power supply (+ B). The applied voltage changes as shown by the broken line in Fig. 2 (b).
従って、雑音検出回路(16)の出力が受信入力レベルＡに
おけるノイズレベルに対応する電圧値になったとき、比
較器(19)の出力がＬレベルとなるように可変抵抗器(18)
を調整しておけば、移動局が基地局から遠ざかり、受信
入力レベルが前記受信入力レベルＡ以下となると、比較
器(19)の出力がＬレベルとなり、これに応じて制御回路
(14)は駆動信号を出力して、例えばスピーカを鳴動し、
以って通話圏外の報知を行なう。Therefore, when the output of the noise detection circuit (16) reaches a voltage value corresponding to the noise level at the reception input level A, the output of the comparator (19) becomes L level so that the variable resistor (18)
If the mobile station moves away from the base station and the reception input level becomes equal to or lower than the reception input level A, the output of the comparator (19) becomes the L level, and the control circuit responds accordingly.
(14) outputs a drive signal, for example, sounds a speaker,
Therefore, the outside of the communication range is notified.
一方、受信入力レベルが高く、高域周波数での変調が深
い場合、受信信号の高調波成分が増加し、これがＰＢＦ
(10)にて抽出されて雑音検出回路(9)の直流信号が増大
しても、比較器(19)の非反転入力端子に供給される電圧
も受信入力レベルに応じて高くなっているため、比較器
(19)の出力はＨレベルを継続する（第２図(d)(e)参
照）。従って、従来の如く誤判定を行うことがない。On the other hand, when the received input level is high and the modulation at high frequencies is deep, the harmonic components of the received signal increase, which results in PBF.
Even if the DC signal of the noise detection circuit ( 9 ) is increased by being extracted at (10), the voltage supplied to the non-inverting input terminal of the comparator (19) is also high according to the received input level. , Comparator
The output of (19) continues to be at the H level (see FIG. 2 (d) (e)). Therefore, there is no erroneous determination as in the conventional case.
第３図は通話圏外検出回路の第２の実施例を示す図であ
り、通話圏外検出回路(17′)は雑音検出回路(9)からの
直流信号が反転入力端子に、可変抵抗器(20)及び抵抗(2
1)よりなる分圧回路(22)からの直流信号が非反転入力端
子に夫々供給される比較器(23)と、分圧回路(22)を構成
する抵抗(21)と並列にコレクタ・エミッタ路が接続され
たトランジスタ(24)と、このトランジスタ(24)のベース
に接続されたインバータ(25)と、信号強度検出回路(16)
からの直流信号が供給されるシュミット回路(26)とより
構成されている。FIG. 3 is a diagram showing a second embodiment of the out-of-service area detection circuit. In the out-of-service area detection circuit ( 17 '), the DC signal from the noise detection circuit ( 9 ) is connected to the inverting input terminal of the variable resistor (20). ) And resistance (2
Comparator (23) to which the DC signal from the voltage divider circuit ( 22 ) consisting of 1) is supplied to the non-inverting input terminal respectively, and the collector and emitter in parallel with the resistor (21) that constitutes the voltage divider circuit ( 22 ). Circuit connected transistor (24), an inverter (25) connected to the base of this transistor (24), and a signal strength detection circuit (16)
It is composed of a Schmitt circuit (26) to which a DC signal from is supplied.
而して、シュミット回路(26)のトリガーレベルを第２図
(b)における受信入力レベルＢに対応する信号強度検出
回路(16)からの直流信号レベルに設定しておけば、受信
入力レベルが前記レベルＢよりも大きい場合には、シュ
ミット回路(26)の出力はＨレベル、インバータ(25)の出
力はＬレベルとなるため、トランジスタ(24)はオフとな
り、比較器(23)の非反転入力端子には可変抵抗器(20)及
び抵抗(21)にて設定される基準電圧が供給される。Then, the trigger level of the Schmitt circuit (26) is shown in FIG.
If the DC signal level from the signal strength detection circuit (16) corresponding to the reception input level B in (b) is set, and the reception input level is higher than the level B, the Schmitt circuit (26) Since the output is H level and the output of the inverter (25) is L level, the transistor (24) is turned off and the non-inverting input terminal of the comparator (23) is connected to the variable resistor (20) and the resistor (21). The reference voltage set according to the above is supplied.
斯る基準電圧を雑音検出回路(9)からの直流信号の最大
レベルよりも大に設定しておけば、比較器(23)の出力は
Ｈレベルを継続する。If the reference voltage is set to be higher than the maximum level of the DC signal from the noise detection circuit ( 9 ), the output of the comparator (23) continues to be H level.
一方、受信入力レベルが前記レベルＢ以下の場合、シュ
ミット回路(26)の出力はＬレベル、インバータ(25)の出
力はＨレベルとなるため、トランジスタ(24)はオンとな
り、抵抗(21)は短絡される。On the other hand, when the reception input level is lower than the level B, the output of the Schmitt circuit (26) becomes L level and the output of the inverter (25) becomes H level, so that the transistor (24) is turned on and the resistor (21) becomes Short circuited.
その結果、比較器(23)の非反転入力端子に供給される基
準電圧は、可変抵抗器(20)の分割比にて決定されるの
で、分割比にて設定される基準電圧を受信入力レベルＡ
におけるノイズレベルに対応する電圧値となるよう調整
しておけば、受信入力レベルが低下して受信入力レベル
Ａ以下となったとき、比較器(23)の出力がＬレベルとな
る。As a result, the reference voltage supplied to the non-inverting input terminal of the comparator (23) is determined by the division ratio of the variable resistor (20), so the reference voltage set by the division ratio is received at the input level. A
If the voltage value is adjusted so as to correspond to the noise level at, the output of the comparator (23) becomes L level when the reception input level decreases and becomes equal to or lower than the reception input level A.
第４図は通話圏外検出回路の第３の実施例を示す図であ
り、通話圏外検出回路(17″）は雑音検出回路(9)からの
直流信号が反転入力端子に、可変抵抗器(27)にて設定さ
れた第１基準電圧が非反転入力端子に夫々供給される第
１比較器(28)と、信号強度検出回路(16)からの直流信号
が非反転入力端子に、可変抵抗器(29)にて設定された第
２基準電圧が反転入力端子に夫々供給される第２比較器
(30)と、第１及び第２比較器(28)(30)の出力が供給され
るＯＲ回路(31)とより構成されている。FIG. 4 is a diagram showing a third embodiment of the out-of-service area detection circuit. In the out-of-service area detection circuit (17 ″), the DC signal from the noise detection circuit ( 9 ) is connected to the inverting input terminal of the variable resistor (27). ), A first comparator (28) to which the first reference voltage set in (1) is supplied to the non-inverting input terminal, and a DC signal from the signal strength detection circuit (16) is connected to the non-inverting input terminal with a variable resistor. A second comparator in which the second reference voltage set in (29) is supplied to each inverting input terminal
(30) and an OR circuit (31) to which the outputs of the first and second comparators (28) and (30) are supplied.
第１基準電圧を受信入力レベルＡにおけるノイズレベル
に対応する電圧値に設定し且つ第２基準電圧を受信入力
レベルＢにおける直流信号レベルに設定しておけば、受
信入力レベルが前記レベルＢよりも大きいときには、第
２比較器(30)の出力はＨレベルとなるから第１比較器(2
8)の出力に拘わらずＯＲ回路(31)の出力はＨレベルとな
る。If the first reference voltage is set to a voltage value corresponding to the noise level at the reception input level A and the second reference voltage is set to the DC signal level at the reception input level B, the reception input level is higher than the level B. When it is larger, the output of the second comparator (30) becomes the H level, so the first comparator (2
The output of the OR circuit (31) becomes H level regardless of the output of 8).
一方、受信入力レベルが前記レベルＡ以下になると、第
１比較器(28)及び第２比較器(30)の出力が共にＬレベル
になるから、ＯＲ回路(31)の出力はＬレベルとなる。On the other hand, when the reception input level becomes equal to or lower than the level A, the outputs of the first comparator (28) and the second comparator (30) both become L level, so the output of the OR circuit (31) becomes L level. .
尚、本発明は上述した実施例に限定されるものではな
く、種々の変更が可能であることは言うまでもない。Needless to say, the present invention is not limited to the above-described embodiments, and various modifications can be made.
(ト)発明の効果 本発明に依れば、信号強度検出回路からの出力と雑音検
出回路からの出力とに応じて通話圏外検出信号を出力す
るようにしたので、受信入力レベルが高く、変調が深い
場合でも、従来の如く通話圏外検出信号が出力されるこ
とはなく、通話圏外報知の精度を高めることができる。(G) Effect of the Invention According to the present invention, the out-of-coverage-range detection signal is output according to the output from the signal strength detection circuit and the output from the noise detection circuit. Even if it is deep, the out-of-call range detection signal is not output as in the conventional case, and the accuracy of out-of-call range notification can be improved.
第１図は本発明の一実施例を示す図、第２図は各特性を
示す図で、同図(a)は受信入力レベルに対する信号及び
ノイス特性を示す図、同図(b)は受信入力レベルに対す
るノイズ、信号強度検出回路からの出力及び比較器の非
反転入力の関係を示す図、同図(c)は受信入力レベルに
対する比較器出力の関係を示す図、同図(d)は変調度に
対する比較器入力の関係を示す図、同図(e)は変調度に
対する比較器出力の関係を示す図、第３図は通話圏外検
出回路の第２実施例を示す図、第４図は通話圏外検出回
路の第３実施例を示す図、第５図は従来例を示す図、第
６図はその特性を示す図で、同図(a)は受信入力レベル
に対する信号及びノイズ特性を示す図、同図(b)は受信
入力レベルに対するノイズ及び比較器の非反転入力の関
係を示す図、同図(c)は受信入力レベルに対する比較器
出力の関係を示す図、同図(d)は変調度に対する比較器
入力の関係を示す図、同図(e)は変調度に対する比較器
出力の関係を示す図である。 (9)……雑音検出回路、(10)……ＢＰＦ、(11)……整流
回路、(14)……制御回路、(15)……報知回路、(16)……
信号強度検出回路、(17)(17′)(17″)……通話圏外検出
回路、(18)(20)(27)(29)……可変抵抗器、(19)(23)……
比較器、(28)……第１比較器、(30)……第２比較器、(3
1)……ＯＲ回路。FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing respective characteristics, FIG. 1 (a) is a diagram showing signals and noise characteristics with respect to a reception input level, and FIG. The figure showing the relationship between the noise from the input level, the output from the signal strength detection circuit and the non-inverting input of the comparator, the figure (c) shows the relationship of the comparator output to the received input level, and the figure (d) shows The figure which shows the relationship of the comparator input with respect to the modulation degree, the figure (e) is a figure which shows the relationship of the comparator output with respect to the modulation degree, FIG. 3 is the figure which shows 2nd Example of the out-of-coverage area detection circuit, FIG. Is a diagram showing a third embodiment of the out-of-service area detection circuit, FIG. 5 is a diagram showing a conventional example, and FIG. 6 is a diagram showing its characteristics. FIG. 6 (a) shows the signal and noise characteristics with respect to the reception input level. Figure (b) shows the relationship between the noise and the non-inverting input of the comparator with respect to the received input level. (C) shows the received input level. Shows the relationship between the comparator output for Le, FIG (d) are diagrams showing the relationship between the comparator input to the modulation factor, FIG. (E) is a diagram showing the relationship between the comparator output to the modulation degree. ( 9 ) …… Noise detection circuit, (10) …… BPF, (11) …… Rectifier circuit, (14) …… Control circuit, (15) …… Notification circuit, (16) ……
Signal strength detection circuit, (17) (17 ′) (17 ″) …… Out-of-range detection circuit, (18) (20) (27) (29) …… Variable resistor, (19) (23) ……
Comparator, (28) …… First comparator, (30) …… Second comparator, (3
1) ... OR circuit.
フロントページの続き (72)発明者 大塚 洋一 大阪府守口市京阪本通２丁目18番地 三洋 電機株式会社内 (72)発明者 田村 芳彦 大阪府守口市京阪本通２丁目18番地 三洋 電機株式会社内Front page continuation (72) Inventor Yoichi Otsuka 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Yoshihiko Tamura 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.
Claims (4)
信系にて受信された信号のレベルを示す直流信号を出力
する信号強度検出回路と、無線電話装置の受信系に設け
られ且つ該受信系にて受信・復調された信号に含まれる
雑音成分のレベルを示す直流信号を出力する雑音検出回
路と、前記信号強度検出回路からの出力及び雑音検出回
路からの出力に応じて通話圏外検出信号を出力する通話
圏外検出回路と、該通話圏外検出回路からの出力に基づ
き駆動される報知回路とを具備したことを特徴とする無
線電話装置の通話圏外報知回路。1. A signal strength detection circuit provided in a receiving system of a wireless telephone device and outputting a DC signal indicating a level of a signal received by the receiving system, and a receiving system provided in the receiving system of the wireless telephone device. A noise detection circuit that outputs a DC signal indicating the level of a noise component included in the signal received and demodulated by the reception system, and detection of out-of-call range according to the output from the signal strength detection circuit and the output from the noise detection circuit An out-of-coverage range notification circuit for a wireless telephone device, comprising: an out-of-coverage range detection circuit for outputting a signal; and an informing circuit driven based on an output from the out-of-coverage range detection circuit.
に雑音検出回路の直流出力が供給され、他方の入力端子
に所定電位点と信号強度検出回路の出力端間に接続され
た抵抗にて分圧された電圧が供給される比較器を備えて
いることを特徴とする請求項１記載の無線電話装置の通
話圏外報知回路。2. The out-of-communication range detection circuit is supplied with a DC output of a noise detection circuit at one input terminal and a resistor connected between a predetermined potential point and an output end of the signal strength detection circuit at the other input terminal. 2. The out-of-coverage-range notification circuit of the wireless telephone device according to claim 1, further comprising a comparator to which the voltage divided by the voltage is supplied.
に雑音検出回路の直流出力が供給され、他方の入力端子
に分圧抵抗にて分圧された基準電圧が供給される比較器
と、前記分圧抵抗の少なくとも１つと並列に接続され、
前記信号強度検出回路の直流出力にて導通制御される半
導体スイッチング素子を備えていることを特徴とする請
求項１記載の無線電話装置の通話圏外報知回路。3. A comparator in which the out-of-communication range detection circuit is supplied with a DC output of the noise detection circuit at one input terminal and a reference voltage divided by a voltage dividing resistor is supplied at the other input terminal. , Connected in parallel with at least one of the voltage dividing resistors,
The out-of-communication range notification circuit of the wireless telephone device according to claim 1, further comprising a semiconductor switching element whose conduction is controlled by a DC output of the signal strength detection circuit.
に雑音検出回路の直流出力が供給され、他方の入力端子
に第１基準電圧が供給される第１比較器と、一方の入力
端子に信号強度検出回路の直流出力が供給され、他方の
入力端子に第２基準電圧が供給される第２比較器と、第
１及び第２比較器の出力が供給されたＯＲ回路とを備え
ていることを特徴とする請求項１記載の無線電話装置の
通話圏外報知回路。4. A first comparator in which the DC output of the noise detection circuit is supplied to one input terminal and a first reference voltage is supplied to the other input terminal of the out-of-communication range detection circuit, and one input terminal. And a second comparator to which the DC output of the signal strength detection circuit is supplied and the second reference voltage is supplied to the other input terminal, and an OR circuit to which the outputs of the first and second comparators are supplied. The out-of-communication range notification circuit of the wireless telephone device according to claim 1, wherein:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1259341A JPH0648802B2 (en) | 1989-10-03 | 1989-10-03 | Out-of-range notification circuit of wireless telephone device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1259341A JPH0648802B2 (en) | 1989-10-03 | 1989-10-03 | Out-of-range notification circuit of wireless telephone device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03120919A JPH03120919A (en) | 1991-05-23 |
| JPH0648802B2 true JPH0648802B2 (en) | 1994-06-22 |
Family
ID=17332762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1259341A Expired - Fee Related JPH0648802B2 (en) | 1989-10-03 | 1989-10-03 | Out-of-range notification circuit of wireless telephone device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0648802B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0586906B1 (en) * | 1992-09-09 | 2000-02-16 | Hitachi, Ltd. | Mobile communications equipment |
-
1989
- 1989-10-03 JP JP1259341A patent/JPH0648802B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03120919A (en) | 1991-05-23 |
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|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |