JP2885906B2 - Car phone - Google Patents
Car phoneInfo
- Publication number
- JP2885906B2 JP2885906B2 JP22544090A JP22544090A JP2885906B2 JP 2885906 B2 JP2885906 B2 JP 2885906B2 JP 22544090 A JP22544090 A JP 22544090A JP 22544090 A JP22544090 A JP 22544090A JP 2885906 B2 JP2885906 B2 JP 2885906B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- filter
- frequency
- window
- vehicle
- 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
Landscapes
- Mobile Radio Communication Systems (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は自動車用電話に関し、特にハンドセツトを持
たずにハンズフリーで通話ができる自動車用電話に関す
る。Description: FIELD OF THE INVENTION The present invention relates to an automobile telephone, and more particularly to an automobile telephone capable of hands-free communication without a handset.
（従来の技術） 従来、自動車用ハンズフリー電話は、例えば運転席に
最も近い車体のピラーに固定されたマイクロホンにて運
転者の音声を拾い、それを電話用送受信装置を介して通
話相手に送つている。2. Description of the Related Art Conventionally, an automobile hands-free telephone picks up a driver's voice using a microphone fixed to a pillar of a vehicle body closest to a driver's seat, for example, and transmits the voice to a communication partner via a telephone transceiver. I'm wearing
（発明が解決しようとする課題） しかしながら、上記従来例では、特に車両の窓が開い
ているときに通話を行なうと、マイクロホンが外来ノイ
ズを拾い、それが通話音声と共に送信されてしまうた
め、通話相手にとつて送信側の音声が聞き取りにくいと
いう欠点がある。(Problems to be Solved by the Invention) However, in the above-mentioned conventional example, in particular, when a call is made when the window of the vehicle is open, the microphone picks up external noise, which is transmitted together with the call voice. There is a disadvantage that the voice of the transmitting side is difficult to hear for the other party.
（課題を解決するための手段及び作用） 本発明は、上述の課題を解決することを目的として成
されたもので、上述の課題を解決する一手段として以下
の構成を備える。(Means and Actions for Solving the Problems) The present invention has been made for the purpose of solving the above problems, and has the following configuration as one means for solving the above problems.
即ち、周囲の音を集音する集音手段と、通話信号の送
受信を行う送受信手段と、前記集音手段と前記送受信手
段との間に設けられ、前記集音手段の出力信号に含まれ
る所定周波数の信号を遮断して前記送受信手段に出力す
るフィルタと、車両の窓の開閉状態を検知する検知手段
とを備え、前記検知手段が該車両の窓が開いていること
を検知したとき、前記フィルタが、前記所定周波数の信
号を遮断することができる。That is, a sound collecting means for collecting surrounding sounds, a transmitting and receiving means for transmitting and receiving a call signal, and a predetermined means provided between the sound collecting means and the transmitting and receiving means and included in an output signal of the sound collecting means A filter that cuts off a frequency signal and outputs the signal to the transmission / reception unit, and a detection unit that detects an open / closed state of a window of the vehicle, wherein when the detection unit detects that the window of the vehicle is open, A filter can block the signal of the predetermined frequency.
（実施例） 以下、添付図面を参照して本発明に係る好適な実施例
を詳細に説明する。Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.
第１図は本発明に係る一実施例である自動車用電話の
構成を示すブロック図である。同図において、窓開閉検
出部１は車両の窓が開いているかを検出し、車両の窓が
閉じているときには切替スイツチ２を図示した位置にす
るので、マイクロホン３が拾つた音声はそのまま電話用
アダプタ６を介して電話用送受信装置７に送られる。し
かし、窓が開いている場合には、切替スイツチ２を上述
とは逆側に倒し、さらにノイズ成分分析部４に所定の信
号を送出する。その結果、マイクロホン３からの音声信
号は、低周波フイルタ５に入力されると同時に、ノイズ
成分分析部４へも入力される。FIG. 1 is a block diagram showing the configuration of an automobile telephone according to an embodiment of the present invention. In FIG. 1, a window opening / closing detecting unit 1 detects whether a vehicle window is open, and when the vehicle window is closed, the switching switch 2 is set to the position shown in FIG. It is sent to the telephone transceiver 7 via the adapter 6. However, when the window is open, the switching switch 2 is tilted to the opposite side from the above, and a predetermined signal is sent to the noise component analyzer 4. As a result, the audio signal from the microphone 3 is input to the low-frequency filter 5 and also to the noise component analyzer 4 at the same time.
ノイズ成分分析部４は、後述する方法にてマイクロホ
ン３が拾つたノイズを分析し、その結果をもとに低周波
フイルタ５内のフイルタ選択部5dにフイルタ選択用信号
を送出する。ノイズ成分分析部４からフイルタ選択用信
号を受けたフイルタ選択部5dは、その信号に従い、それ
ぞれ後述する周波数特性を有するフイルタa,b,あるいは
ｃを選択する。The noise component analysis unit 4 analyzes the noise picked up by the microphone 3 by a method described later, and sends a filter selection signal to a filter selection unit 5d in the low frequency filter 5 based on the analysis result. Upon receiving the filter selection signal from the noise component analysis unit 4, the filter selection unit 5d selects a filter a, b, or c having a frequency characteristic, which will be described later, according to the signal.
第２図は、低周波フイルタ５に内蔵される３種類のフ
イルタの周波数特性を示す。FIG. 2 shows the frequency characteristics of three types of filters incorporated in the low-frequency filter 5.
フイルタａは第２図に示す周波数特性の内、高周波数
帯域でのカツトオフ周波数faを有するフイルタであり、
その他、フイルタｂ、フイルタｃはそれぞれカツトオフ
周波数fb，fcを有する。また、各フイルタ共、低周波数
領域でのカツトオフ周波数は同一である。The filter a is a filter having a cut-off frequency fa in a high frequency band among the frequency characteristics shown in FIG.
In addition, the filters b and c have cut-off frequencies f b and f c , respectively. The cutoff frequency in the low frequency region is the same for each filter.
ここで、ノイズ成分分析部４における外来ノイズの分
析方法について簡単に説明する。Here, a method of analyzing external noise in the noise component analyzer 4 will be briefly described.
一般に、車室内に設置されたマイクロホンに到達する
外来ノイズとしては、自車及び他車のエンジンノイズ、
自車の空調音、風切り音等があり、特に窓を開けたとき
には風切り音と他車のエンジンノイズが顕著に増える。
そこで、ノイズ成分分析部４は、マイクロホン３が拾つ
た音声周波数帯域の音の中から、振幅が一定レベルを越
えて、所定時間、定常的に現われる信号成分を拾い出
し、その周波数を分析する。そして、その結果をもとに
フイルタ選択信号を低周波フイルタ５に送る。Generally, external noise that reaches a microphone installed in a vehicle compartment includes engine noise of the own vehicle and other vehicles,
There are air-conditioning noise and wind noise of the own vehicle, and especially when the window is opened, the wind noise and the engine noise of other vehicles increase remarkably.
Therefore, the noise component analysis unit 4 picks up a signal component whose amplitude exceeds a certain level and constantly appears for a predetermined time from the sound in the audio frequency band picked up by the microphone 3, and analyzes the frequency. Then, a filter selection signal is sent to the low frequency filter 5 based on the result.
第３図は、本実施例の自動車用電話でのフイルタ選択
手順を示すフローチャートである。FIG. 3 is a flowchart showing a filter selecting procedure in the vehicle telephone according to the present embodiment.
第３図のステツプS1で、窓開閉検出部１にて車両の窓
が開いているか否かを判定し、閉じていれば直ちに処理
を終える。しかし、窓が開いていればステツプS2にて切
替スイツチ２を低周波フイルタ５側に倒す。そして、続
くステツプS3で、ノイズ成分分析部４は上述の如く、入
力される信号の中に定常的に出現する信号が存在するか
どうかを判断する。ここでの判断がYESであれば、ステ
ツプS4でその周波数ｆを特定し、ｆ＜fbであれば、ステ
ツプS5に進んでフイルタａを選択する。また、ステツプ
S4で特定した周波数ｆがｆ≒fbであれば、ステツプS6に
てフイルタｂを選択する。同様に、ｆ＞fbであれば、ス
テツプS7でフイルタｃを選択する。In step S1 of FIG. 3, the window open / close detector 1 determines whether or not the window of the vehicle is open. If the window is closed, the process is immediately terminated. However, if the window is open, the switch 2 is moved to the low frequency filter 5 in step S2. Then, in the following step S3, the noise component analyzer 4 determines whether or not there is a signal that constantly appears in the input signal as described above. If this determination is YES, identifies the frequency f at step S4, if f <f b, selecting a filter a proceeds to step S5. Also, step
If the identified frequency f a f ≒ f b in S4, selects the filter b in step S6. Similarly, if f> f b, selecting a filter c in step S7.
ステツプS3で、定常的に現われる信号が存在しない場
合は、通話帯域をできるだけ広くとる意味で、ステツプ
S7に進んでフイルタｃを選択する。In step S3, if there is no signal that constantly appears, the step is to increase the communication bandwidth as much as possible.
Proceed to S7 to select the filter c.
以上説明したように、本実施例によれば、車両の窓が
開いていることを検知して、マイクロホンに到来する外
来ノイズの周波数分析を行ない、その周波数に対応する
カツトオフ周波数を有するフイルタを選択して通話回路
に挿入するので、窓を開けて通話しても外来ノイズが通
話相手に送出されず、相手にとつて音声が聞き取り易す
くなるという効果がある。As described above, according to the present embodiment, it is detected that the window of the vehicle is open, the frequency of the external noise arriving at the microphone is analyzed, and a filter having a cutoff frequency corresponding to the frequency is selected. Therefore, even if the user opens the window and talks, no extraneous noise is sent to the other party, and the voice is easily heard by the other party.
尚、上記実施例では、マイクロホンに到達するノイズ
の周波数分析を行ない、フイルタを選択していたが、車
速をもとに外来ノイズを判断してフイルタを選択しても
よい。In the above embodiment, the filter is selected by analyzing the frequency of the noise that reaches the microphone, but the filter may be selected by determining the external noise based on the vehicle speed.
（発明の効果） 以上説明したように、本発明によれば、車両の窓が開
いているときに、集音部が拾つた外来ノイズを遮断でき
るので、通話相手にとり音声が聞き取り易くなるという
効果がある。(Effect of the Invention) As described above, according to the present invention, when the window of the vehicle is open, the external noise picked up by the sound collection unit can be cut off, so that the voice can be easily heard by the other party. There is.
第１図は本発明に係る一実施例である自動車用電話の構
成を示すブロツク図、 第２図は低周波フイルタに内蔵される３種類のフイルタ
の周波数特性を示す図、 第３図は実施例の自動車用電話でのフイルタ選択手順を
示すフローチヤートである。 図中、１…窓開閉検出部、２…切替スイツチ、３…マイ
クロホン、４…ノイズ成分分析部、５…低周波フイル
タ、６…電話用アダプタ、７…電話用送受信装置であ
る。FIG. 1 is a block diagram showing a configuration of a car telephone according to an embodiment of the present invention, FIG. 2 is a diagram showing frequency characteristics of three types of filters incorporated in a low-frequency filter, and FIG. 5 is a flowchart showing a filter selection procedure in an example car phone. In the figure, reference numeral 1 denotes a window opening / closing detecting unit, 2 a switching switch, 3 a microphone, 4 a noise component analyzing unit, 5 a low frequency filter, 6 a telephone adapter, and 7 a telephone transmitting / receiving device.
Claims (4)
集音手段の出力信号に含まれる所定周波数の信号を遮断
して前記送受信手段へ出力するフィルタと、 車両の窓の開閉状態を検知する検知手段とを備え、 前記検知手段が該車両の窓が開いていることを検知した
とき、前記フィルタが、前記所定周波数の信号を遮断す
ることを特徴とする自動車電話。1. A sound collecting means for collecting surrounding sounds; a transmitting / receiving means for transmitting / receiving a signal; and a signal provided between the sound collecting means and the transmitting / receiving means and included in an output signal of the sound collecting means. A filter for cutting off a signal of a predetermined frequency to be output to the transmitting / receiving means, and a detecting means for detecting an open / closed state of a window of the vehicle, wherein the detecting means detects that the window of the vehicle is open. And the filter blocks the signal of the predetermined frequency.
号がそれぞれ異なる複数のフィルタであって、 更に、前記複数のフィルタの何れか１つを選択する選択
手段を備えることを特徴とする請求項１記載の自動車電
話。2. A filter according to claim 1, wherein said filter comprises a plurality of filters having different signals of a predetermined frequency to be cut off, and further comprising a selecting means for selecting any one of said plurality of filters. The car telephone according to 1.
含まれる信号の有無に応じて、何れか１つのフィルタを
選択することを特徴とする請求項２記載の自動車電話。3. The car telephone according to claim 2, wherein said selection means selects any one of the filters in accordance with the presence or absence of a signal constantly included in said output signal.
含まれる信号の周波数に応じて、何れか１つのフィルタ
を選択することを特徴とする請求項２記載の自動車電
話。4. The car telephone according to claim 2, wherein said selection means selects any one of the filters according to a frequency of a signal constantly included in said output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22544090A JP2885906B2 (en) | 1990-08-29 | 1990-08-29 | Car phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22544090A JP2885906B2 (en) | 1990-08-29 | 1990-08-29 | Car phone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04108229A JPH04108229A (en) | 1992-04-09 |
| JP2885906B2 true JP2885906B2 (en) | 1999-04-26 |
Family
ID=16829401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22544090A Expired - Fee Related JP2885906B2 (en) | 1990-08-29 | 1990-08-29 | Car phone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2885906B2 (en) |
-
1990
- 1990-08-29 JP JP22544090A patent/JP2885906B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04108229A (en) | 1992-04-09 |
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