JPH1051330A - Variable frequency band device - Google Patents
Variable frequency band deviceInfo
- Publication number
- JPH1051330A JPH1051330A JP21688796A JP21688796A JPH1051330A JP H1051330 A JPH1051330 A JP H1051330A JP 21688796 A JP21688796 A JP 21688796A JP 21688796 A JP21688796 A JP 21688796A JP H1051330 A JPH1051330 A JP H1051330A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- band
- radio wave
- dsp
- hpf
- 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.)
- Granted
Links
Landscapes
- Noise Elimination (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】複数の電波型式を受信可能な
受信機におけるオーディオフィルターの制御に関する。The present invention relates to control of an audio filter in a receiver capable of receiving a plurality of radio wave types.
【０００２】[0002]
【従来の技術】従来の受信機では、受信して再生した音
声信号の必要な音声帯域に近接するか入り込むノイズに
対しては、ＩＦシフトやＩＦワイズなどでノイズをＩＦ
周波数帯域外に出すことで処理していた。それに加えて
検波して復調した信号に対してもオーディオフィルター
を用いて不要なノイズを除去していた。このオーディオ
フィルターは電波型式を変更しても、オーディオフィル
ターの上限及び下限の最大値は一定で、その範囲内での
み任意の帯域を設定していた。2. Description of the Related Art In a conventional receiver, noise that approaches or enters a required audio band of a received and reproduced audio signal is reduced by IF shift or IF wise.
The processing was done by out of the frequency band. In addition, an unnecessary noise is removed from the detected and demodulated signal using an audio filter. In this audio filter, even if the radio wave type is changed, the maximum value of the upper limit and the lower limit of the audio filter is constant, and an arbitrary band is set only within the range.
【０００３】そのために最も広いオーディオ帯域を必要
とする電波型式に合わせてオーディオフィルターの上限
と下限に設定していた。従って、ＣＷなどの狭いオーデ
ィオ帯域で聞き分けられる電波型式においては、変更す
る周波数帯域の狭さに対して可変操作が広い周波数帯域
の場合と同じ周波数の変化量であるから微小の変更操作
をするのが困難であった。For this purpose, the upper limit and lower limit of the audio filter have been set in accordance with the radio wave type requiring the widest audio band. Therefore, in the radio wave type that can be distinguished in a narrow audio band such as CW, the variable operation is the same as the frequency change amount in the case of a wide frequency band with respect to the narrowness of the frequency band to be changed, so that a small change operation is performed Was difficult.
【０００４】[0004]
【発明が解決しようとする課題】主としてＨＦ帯の無線
通信において、一般的には音声によるＪ３Ｅ，Ａ３Ｅの
ようなモードが約３ＫＨｚと最も広いオーディオ帯域を
必要とする。これに対して電信（Ａ１Ａ）では数百Ｈｚ
以下の狭いオーディオ帯域が適当である。In wireless communication mainly in the HF band, a mode such as J3E or A3E by voice generally requires the widest audio band of about 3 KHz. In contrast, telegraph (A1A) has several hundred Hz.
The following narrow audio band is appropriate.
【０００５】特にアマチュア無線においては混信の軽
減、聴感上の補正のために、受信検波段とＡＦパワーア
ンプ間に可変帯域のオーディオフィルターを挿入し、帯
域を調整できるようにしたものがある。[0005] In particular, in an amateur radio, a variable band audio filter is inserted between a reception detection stage and an AF power amplifier so that the band can be adjusted in order to reduce interference and correct audibility.
【０００６】この可変帯域のオーディオフィルターとす
るのにＬＰＦとＨＰＦを組み合わせてＢＰＦとなるよう
にしたとき、その最大帯域幅を最も広い電話（Ａ３Ｅ、
Ｊ３Ｅ）に合わせる。電信（Ａ１Ａ）の際には、ＬＰ
Ｆ、ＨＰＦを各々絞って帯域を狭くする。このとき、帯
域幅調整に展開角３００゜の可変抵抗器ＶＲを使用する
と、電話（Ａ３Ｅ、Ｊ３Ｅ）モード時に対して電信（Ａ
１Ａ）では調整範囲が限定されるため、微調整がやりに
くくなる。本発明はこのような操作が通信モードに関係
なく微調整にたいする回転角が十分にとれるような帯域
可変装置の提供を目的とする。When an LPF and an HPF are combined to form a BPF in order to provide an audio filter having a variable band, the maximum bandwidth of the telephone (A3E,
J3E). In the case of telegraph (A1A), LP
F and HPF are each narrowed to narrow the band. At this time, if a variable resistor VR having an expansion angle of 300 ° is used for bandwidth adjustment, the telegraph (A3E, J3E) mode can be used.
In 1A), the adjustment range is limited, so that fine adjustment is difficult. An object of the present invention is to provide a band variable device in which such an operation can take a sufficient rotation angle for fine adjustment regardless of the communication mode.
【０００７】[0007]
【課題を解決するための手段】検波器とＡＦアンプとの
間に設けるオーディオフィルターとするＤＳＰフィルタ
ーのＢＰＦを形成するＬＰＦ及びＨＰＦの帯域調整部の
可変抵抗器ＶＲの回転角度を検出するために直流電流を
流し、角度に比例した直流電圧をＣＰＵのＡ／Ｄ変換ポ
ートへ入力し、演算処理してＣＰＵからＤＳＰフィルタ
ーのＬＰＦ及びＨＰＦの設定データをＤＳＰへ出力す
る。ＤＳＰは与えられたデータに応じてＬＰＦとＨＰＦ
のカットオフ特性を設定する。In order to detect a rotation angle of a variable resistor VR in a band adjustment unit of an LPF and an HPF which forms a BPF of a DSP filter serving as an audio filter provided between a detector and an AF amplifier. A DC current is supplied, a DC voltage proportional to the angle is input to the A / D conversion port of the CPU, arithmetic processing is performed, and the LPF and HPF setting data of the DSP filter are output from the CPU to the DSP. The DSP has LPF and HPF according to the given data.
Set the cutoff characteristics of
【０００８】[0008]
【発明の実施の形態】本発明の構成を図１により説明す
る。図中１はアンテナ、２はＲＦ・ＩＦ回路、３は検波
器、４はＤＳＰ（Ｄｉｇｉｔａｌ Ｓｉｇｎａｌ Ｐｒ
ｏｃｅｓｓｏｒ）とＤＳＰの制御でカットオフ特性が設
定されるＨＰＦ、ＬＰＦからなるＤＳＰフィルター、５
はＣＰＵ、６はＤＳＰフィルター４のＨＰＦ、ＬＰＦの
特性の選択をする帯域選択部、７は電波型式を選択する
モード選択部、８はＡＦアンプ、９はスピーカである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described with reference to FIG. In the figure, 1 is an antenna, 2 is an RF / IF circuit, 3 is a detector, 4 is a DSP (Digital Signal Pr).
processor and a DSP filter composed of an HPF and an LPF whose cutoff characteristics are set by control of the DSP.
Denotes a CPU, 6 denotes a band selection unit for selecting characteristics of the HPF and LPF of the DSP filter 4, 7 denotes a mode selection unit for selecting a radio wave type, 8 denotes an AF amplifier, and 9 denotes a speaker.
【０００９】図１の動作の概要を説明する。モード選択
部７で選択した電波形式で所望の周波数を選択設定して
受信状態にする。アンテナ１から信号を受信するとＲＦ
・ＩＦ回路２でＩＦ変換及び増幅されて、その出力を検
波器３に送出して検波再生される。この再生された信号
は、ＤＳＰフィルター４を通してＡＦアンプ８から音声
をスピーカ９により出力する。An outline of the operation of FIG. 1 will be described. A desired frequency is selected and set in the radio wave format selected by the mode selection unit 7, and a reception state is set. RF when receiving signal from antenna 1
The signal is IF-converted and amplified by the IF circuit 2, and its output is sent to the detector 3 to be detected and reproduced. The reproduced signal is output from the AF amplifier 8 through the DSP filter 4 and the sound is output from the speaker 9.
【００１０】ここでＤＳＰフィルター４の帯域可変につ
いて説明する。モード選択部７により電波型式を選択す
ると、その選択した電波型式の信号はＣＰＵ５に入力し
て、その電波型式の必要最大値の帯域幅となる帯域設定
用データを演算してＤＳＰフィルター４のＤＳＰに制御
信号として出力する。ＤＳＰはその制御信号でＢＰＦを
形成するＦＩＲフィルター（Ｆｉｎｉｔｅ Ｉｍｐｕｌ
ｓｅ Ｒｅｓｐｏｎｓｅ）やＩＩＲフィルター（Ｉｎｆ
ｉｎｉｔｅ Ｉｍｐｕｌｓｅ Ｒｅｓｐｏｎｓｅ）から
なるＨＰＦ、ＬＰＦのカットオフ特性を設定する。従っ
て、ＳＳＢやＣＷでは最大帯域幅が異なって設定され
る。Here, the variable bandwidth of the DSP filter 4 will be described. When the radio wave type is selected by the mode selection unit 7, the signal of the selected radio wave type is input to the CPU 5, and the band setting data corresponding to the required maximum bandwidth of the radio wave type is calculated, and the DSP of the DSP filter 4 is processed. As a control signal. The DSP uses an FIR filter (Finite Impul) that forms a BPF with the control signal.
se Response) and IIR filter (Inf
The cut-off characteristics of the HPF and the LPF, which are composed of an init impulse response, are set. Therefore, the maximum bandwidth is set differently in SSB and CW.
【００１１】又、帯域選択部６ではＨＰＦ用可変抵抗器
６ａやＬＰＦ用可変抵抗器６ｂによって回転角に応じた
直流電流による電圧を発生してＣＰＵ５に入力される。
ＣＰＵ５では電波型式の選択信号と、この帯域選択部６
から入力されたＨＰＦ用可変抵抗器６ａとＬＰＦ用可変
抵抗器６ｂから入力された選択電圧データとを基に演算
処理した帯域設定信号をＤＳＰフィルタ４ーのＤＳＰに
出力し、ＤＳＰから制御信号をＢＰＦを形成するＨＰＦ
とＬＰＦに出力して、カットオフ特性を設定する。The band selector 6 generates a DC voltage corresponding to the rotation angle by the HPF variable resistor 6a and the LPF variable resistor 6b and inputs the voltage to the CPU 5.
In the CPU 5, a radio wave type selection signal and the band selection unit 6
A band setting signal calculated based on the HPF variable resistor 6a and the selection voltage data inputted from the LPF variable resistor 6b input to the DSP filter 4 is output to the DSP of the DSP filter 4, and the control signal is output from the DSP. HPF forming BPF
To the LPF to set the cutoff characteristic.
【００１２】ここでＳＳＢモードを選択された場合につ
いて説明する。モード選択部７でＳＳＢを選択すると、
その選択信号はＣＰＵに入力してＲＦ・ＩＦ回路２にＳ
ＳＢの受信に必要な制御設定を行うとともに復調用のＢ
ＦＯ信号を発生させて検波器３に送りＳＳＢの受信信号
を復調する。通常の復調信号はＤＳＰフィルター４を通
すが、音声帯域（３００Ｈｚ〜３０００Ｈｚ程度）が必
要である。この周波数を通すのに必要なＤＳＰで制御さ
れるＬＰＦとＨＰＦとのカットオフ周波数の上限と下限
を設定することでＳＳＢの最大帯域幅になる。この設定
はモード選択部７からの電波型式の信号がＣＰＵ５に入
力され、演算処理してＤＳＰフィルター４に出力するこ
とで設定される。図２はＳＳＢとＣＷのオーディオフィ
ルターの帯域特性を示した図である。Here, the case where the SSB mode is selected will be described. When SSB is selected in the mode selection section 7,
The selection signal is input to the CPU and sent to the RF / IF circuit 2 by S.
Performs control settings necessary for SB reception, and sets B for demodulation.
The FO signal is generated and sent to the detector 3 to demodulate the SSB received signal. A normal demodulated signal passes through the DSP filter 4, but requires an audio band (about 300 Hz to 3000 Hz). By setting the upper and lower cutoff frequencies of the LPF and HPF controlled by the DSP required to pass this frequency, the maximum bandwidth of the SSB is obtained. This setting is performed by inputting a radio wave type signal from the mode selection unit 7 to the CPU 5, performing arithmetic processing, and outputting the result to the DSP filter 4. FIG. 2 is a diagram showing band characteristics of SSB and CW audio filters.
【００１３】帯域選択部６のＬＰＦ用可変抵抗器６ｂあ
るいはＨＰＦ用可変抵抗器６ａのツマミを回転させて低
周波数の通過帯域を変化させる場合には、予め設定され
ている最大帯域幅内でのみカットオフ周波数の変化が可
能である。例えば、２００Ｈｚ〜３２００Ｈｚを最大帯
域幅としてＨＰＦ用可変抵抗器６ａまたはＬＰＦ用可変
抵抗器６ｂの全回転角度を３０等分してカットオフ周波
数の変化幅とすれば、３０００／３０＝１００Ｈｚ／１
ｓｔｅｐとなる。図３はＨＰＦとＬＰＦのカットオフ特
性を選択する帯域選択部６のＨＰＦ用可変抵抗器６ａと
ＬＰＦ用可変抵抗器６ｂとを調整するツマミを示したも
のである。When changing the low frequency pass band by rotating the knob of the LPF variable resistor 6b or the HPF variable resistor 6a of the band selector 6, only within the preset maximum bandwidth. A change in the cutoff frequency is possible. For example, if the maximum bandwidth is 200 Hz to 3200 Hz, and the total rotation angle of the HPF variable resistor 6 a or the LPF variable resistor 6 b is divided into 30 equal parts and the change width of the cutoff frequency is 3000/30 = 100 Hz / 1
It becomes step. FIG. 3 shows a knob for adjusting the HPF variable resistor 6a and the LPF variable resistor 6b of the band selection section 6 for selecting the cutoff characteristics of the HPF and the LPF.
【００１４】次に、電信ＣＷ信号の場合は、ＢＦＯのピ
ッチは４００Ｈｚ〜８００Ｈｚが通常使用されており、
最大帯域幅は２００Ｈｚ〜１１００Ｈｚあれば十分であ
る。ＳＳＢの場合と同様にＨＰＦ用可変抵抗器６ａとＬ
ＰＦ用可変抵抗器６ｂの回転角度を３０等分すれば、お
よそ９００／３０＝３０Ｈｚ／１ｓｔｅｐとなる。Next, in the case of a telegraph CW signal, a BFO pitch of 400 Hz to 800 Hz is usually used.
A maximum bandwidth of 200 Hz to 1100 Hz is sufficient. As in the case of the SSB, the HPF variable resistor 6a and the L
If the rotation angle of the PF variable resistor 6b is divided into 30 equal parts, it becomes about 900/30 = 30 Hz / 1 step.
【００１５】よって、ＳＳＢに比べてＣＷ信号の場合に
は１ステップ当たりの変化量が約１／３になり、ＬＰＦ
及びＨＰＦをカットオフ帯を絞って、最も狭いＢＰＦ特
性にしたとき、その帯域幅は３０Ｈｚとなる。通常の交
信ではこのような狭帯域は必要とされないが相手の信号
強度が極端に弱いときや、激しい混信のときは有効であ
る。Therefore, in the case of the CW signal, the amount of change per one step is about 1/3 as compared with the SSB, and the LPF
When the HPF and the HPF have the narrowest BPF characteristics by narrowing the cutoff band, the bandwidth is 30 Hz. Such narrow band is not required for ordinary communication, but is effective when the signal strength of the other party is extremely weak or when there is severe interference.
【００１６】[0016]
【発明の効果】本発明によれば、ＤＳＰフィルターのＬ
ＰＦとＨＰＦの組み合わせによるオーディオフィルター
ＢＰＦの帯域幅の設定データはＨＰＦ用可変抵抗器とＬ
ＰＦ用可変抵抗器に直流電流を流すことで回転角に応じ
た直流電圧を得てＣＰＵに入力し、演算処理してＤＳＰ
フィルターのＤＳＰに出力する。ＤＳＰではこの制御デ
ータによりＨＰＦ，ＬＰＦを形成するＦＩＲフィルタ或
いはＩＩＲフィルターのパラメータを設定して電波型式
に応じた必要な帯域特性を実現する。According to the present invention, the DSP filter L
The setting data of the bandwidth of the audio filter BPF by the combination of the PF and the HPF is composed of the HPF variable resistor and the L
By passing a DC current through the PF variable resistor, a DC voltage corresponding to the rotation angle is obtained, input to the CPU, and subjected to arithmetic processing to the DSP.
Output to the DSP of the filter. The DSP sets parameters of the FIR filter or the IIR filter forming the HPF and the LPF based on the control data to realize necessary band characteristics according to the radio wave type.
【図１】本発明の帯域可変装置を説明するためのブロッ
ク図である。FIG. 1 is a block diagram for explaining a band variable device according to the present invention.
【図２】ＳＳＢとＣＷの通過帯域特性を示す図である。FIG. 2 is a diagram illustrating pass band characteristics of SSB and CW.
【図３】帯域可変装置の可変ツマミの可変領域を説明す
るための図である。FIG. 3 is a diagram illustrating a variable region of a variable knob of the band variable device.
１ アンテナ ２ ＲＦ・ＩＦ回路 ３ 検波器 ４ ＤＳＰフィルター ５ ＣＰＵ ６ 帯域選択部 ６ａ ＨＰＦ用可変抵抗器 ６ｂ ＬＰＦ用可変抵抗器 ７ モード選択部 ８ ＡＦアンプ ９ スピーカ DESCRIPTION OF SYMBOLS 1 Antenna 2 RF / IF circuit 3 Detector 4 DSP filter 5 CPU 6 Band selection part 6a Variable resistor for HPF 6b Variable resistor for LPF 7 Mode selection part 8 AF amplifier 9 Speaker
Claims (2)
た受信機において、検波器の後段に設けたオーディオフ
ィルターの帯域を電波型式毎に設定することを特徴とす
る帯域可変装置。1. A band variable device for a receiver using a CPU capable of receiving a plurality of radio wave types, wherein a band of an audio filter provided at a subsequent stage of the detector is set for each radio wave type.
フィルターとし、該ＤＳＰフィルターは選択された電波
型式に基づき必要な最大帯域幅を設定し、ＤＳＰフィル
ターの帯域を設定するＨＰＦとＬＰＦのカットオフ特性
を選択設定する可変操作量は、電波型式毎の最大帯域幅
に対応させて可変設定すること特徴とする帯域可変装
置。2. The audio filter according to claim 1, wherein the audio filter is a DSP.
The DSP filter sets the required maximum bandwidth based on the selected radio wave type, and selects and sets the cut-off characteristics of the HPF and LPF for setting the band of the DSP filter. A band variable device characterized by being variably set corresponding to a maximum bandwidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08216887A JP3102630B2 (en) | 1996-07-31 | 1996-07-31 | Audio band adjuster in receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08216887A JP3102630B2 (en) | 1996-07-31 | 1996-07-31 | Audio band adjuster in receiver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1051330A true JPH1051330A (en) | 1998-02-20 |
| JP3102630B2 JP3102630B2 (en) | 2000-10-23 |
Family
ID=16695474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08216887A Expired - Lifetime JP3102630B2 (en) | 1996-07-31 | 1996-07-31 | Audio band adjuster in receiver |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3102630B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006050016A (en) * | 2004-07-30 | 2006-02-16 | Icom Inc | Radio device and method of attenuating noise |
| JP2006261858A (en) * | 2005-03-15 | 2006-09-28 | Fujitsu Ltd | Receiving device and method of processing received signal |
| JP2007060469A (en) * | 2005-08-26 | 2007-03-08 | Kenwood Corp | Residual noise reduction circuit |
-
1996
- 1996-07-31 JP JP08216887A patent/JP3102630B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006050016A (en) * | 2004-07-30 | 2006-02-16 | Icom Inc | Radio device and method of attenuating noise |
| JP2006261858A (en) * | 2005-03-15 | 2006-09-28 | Fujitsu Ltd | Receiving device and method of processing received signal |
| JP4674103B2 (en) * | 2005-03-15 | 2011-04-20 | 富士通セミコンダクター株式会社 | Reception apparatus and received signal processing method |
| JP2007060469A (en) * | 2005-08-26 | 2007-03-08 | Kenwood Corp | Residual noise reduction circuit |
| JP4542482B2 (en) * | 2005-08-26 | 2010-09-15 | 株式会社ケンウッド | Residual noise reduction circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3102630B2 (en) | 2000-10-23 |
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