JPS60101599A - Amplitude adjustment circuit - Google Patents
Amplitude adjustment circuitInfo
- Publication number
- JPS60101599A JPS60101599A JP58208668A JP20866883A JPS60101599A JP S60101599 A JPS60101599 A JP S60101599A JP 58208668 A JP58208668 A JP 58208668A JP 20866883 A JP20866883 A JP 20866883A JP S60101599 A JPS60101599 A JP S60101599A
- Authority
- JP
- Japan
- Prior art keywords
- amplitude
- level
- signal
- attenuator
- adjustment circuit
- 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
Links
Landscapes
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Details Of Television Scanning (AREA)
- Filters And Equalizers (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
進1じL顆
本発明は、音声信号の振幅レベルを適当なレベルに設定
するための振幅調整回路に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an amplitude adjustment circuit for setting the amplitude level of an audio signal to an appropriate level.
皿釆技止
一般に、音声信号は発音者のコンディション、周囲の状
況等によりその都度大きさが変化する。In general, the size of a voice signal changes depending on the condition of the person making the sound, the surrounding situation, etc.
しかし、それをそのま\音声分析器や音声認識装置に入
力したのでは大きすぎたり、小さすぎたりして適当なレ
ベルで動作することができない。このため、振幅調整回
路を用いてレベルを適当に調整する方法がとられる。こ
の場合、一般的な振幅調整回路の入出力特性は第1図の
如くであり小レベルは急激に立ち上がり大レベルは一定
レベルに制御される。However, if you input it directly into a speech analyzer or speech recognition device, it will be too large or too small to operate at an appropriate level. For this reason, a method is used to appropriately adjust the level using an amplitude adjustment circuit. In this case, the input/output characteristics of a general amplitude adjustment circuit are as shown in FIG. 1, and the small level rises rapidly and the large level is controlled to a constant level.
第2図は、上述のごとき制御を行うための制御回路の一
例を説明するための図で、■は入力端子、2は振幅減衰
器、3は増幅器、4はレベル検出器、5は出力端子で、
入力端子1よりの入力信号は振幅減衰器2でその振幅が
制御さJLる。振幅減衰器2の出力は増幅器3で幅増さ
れて出力端子5に出力されると同時にレベル検出器4に
印加され、このレベル検出器4の出力により振幅減衰器
2が制御される。このときの減衰特性は第3図に示すご
とくであり、出力が大きい時は減衰度が大きく、小さい
時は小さくなるように作用し、結果として第1図の如き
特性が得られる。しかし、この場合の不具合は音声信号
のない無音区間で雑音レベルの利得が上昇して音声の語
頭の検出を誤ったり語中の無音区間の検出ができなくな
ったりすることである。FIG. 2 is a diagram for explaining an example of a control circuit for performing the above-mentioned control, where ■ is an input terminal, 2 is an amplitude attenuator, 3 is an amplifier, 4 is a level detector, and 5 is an output terminal. in,
The amplitude of the input signal from the input terminal 1 is controlled by an amplitude attenuator 2. The output of the amplitude attenuator 2 is amplified by the amplifier 3 and output to the output terminal 5, and is simultaneously applied to the level detector 4, and the amplitude attenuator 2 is controlled by the output of the level detector 4. The attenuation characteristics at this time are as shown in FIG. 3, and when the output is large, the attenuation is large and when the output is small, it is small, and as a result, the characteristics shown in FIG. 1 are obtained. However, a problem in this case is that the gain of the noise level increases in silent sections where there is no speech signal, resulting in incorrect detection of the beginning of a speech word or inability to detect a silent section in the middle of a word.
「1的
本発明は、」二連のごとき実情に鑑みてなき扛だもので
、特に、音声信号のレベルを適正に設定するための振幅
調整回路を改良して上述のごとき従来技術の欠点を解消
することを目的としてなされたものである。The first aspect of the present invention is to overcome the above-mentioned drawbacks of the prior art by improving the amplitude adjustment circuit for appropriately setting the level of the audio signal. This was done with the aim of resolving the issue.
L−暖
本発明の溝成について、以下、実施例に基づいて説明す
る。The groove formation of the L-warm invention will be described below based on Examples.
第4図は、本発明の一実施例を説明するための電気的ブ
ロック線図で、図中、6はバイアス回路、7は切り換え
手段、8は音声区間検出回路で、その他第2図と同様の
作用をする部分には第2図の場合と同一の参照番号が付
しである。而して、本発明は、雑音レベルでの利得の」
二昇をおさえて音声信号区間のみで振幅調整ができる振
幅調整回路を提供しようとするもので、図示のように、
振幅減衰器2と、増幅器3と、レベル検出器4と、無音
区間に一定バイアスを与えるバイアス回路6と、レベル
検出器出力とバイアス出力とを切り換える切り換え手段
7とを有し、この切り換えを入力信号の音声区間を検出
する検出器の検出信号で行なって音声信号のみの利得を
調整して振幅調整をしようとするものである。すなわち
、第4図において、入力信号は振幅減衰器2に印加され
ると同時に音声区間検出器8に印加される。ただし、こ
の場合、音声区間は促音等の無音区間を除いた区間を言
う。振幅減衰器2はレベル検出器4と一定バイアスを与
えるバイアス回路6の出力とを切り換える切り換え手段
7からの出力により入力信号の ゛振幅を制御するが、
この場合一定バイアスは第3図の減衰特性が大きい値、
つまり雑音レベルが強調されないレベルに設定される。FIG. 4 is an electrical block diagram for explaining one embodiment of the present invention, in which 6 is a bias circuit, 7 is a switching means, 8 is a voice section detection circuit, and the rest is the same as in FIG. 2. The same reference numerals as in FIG. 2 are given to the parts which act. Therefore, the present invention provides a gain at the noise level.
This is intended to provide an amplitude adjustment circuit that can suppress the rise in amplitude and adjust the amplitude only in the audio signal section, as shown in the figure.
It has an amplitude attenuator 2, an amplifier 3, a level detector 4, a bias circuit 6 that applies a constant bias to the silent section, and a switching means 7 that switches between the level detector output and the bias output. This method attempts to adjust the amplitude by adjusting the gain of only the audio signal using the detection signal of the detector that detects the audio section of the signal. That is, in FIG. 4, the input signal is applied to the amplitude attenuator 2 and simultaneously applied to the voice section detector 8. However, in this case, the voice section refers to the section excluding silent sections such as consonants. The amplitude attenuator 2 controls the amplitude of the input signal by the output from the switching means 7 which switches between the level detector 4 and the output of the bias circuit 6 which provides a constant bias.
In this case, the constant bias is the value where the attenuation characteristic in Figure 3 is large,
In other words, the noise level is set to a level that is not emphasized.
このレベル検出器4とバイアス回路6の切り換えは音声
区間検出器8の検出信号に同期して行なわれる。This switching between the level detector 4 and the bias circuit 6 is performed in synchronization with the detection signal of the voice section detector 8.
紘−一教
以上の説明から明らかなように、本発明によると、音声
区間のみ入力音声信号の振幅が調整されるので雑音信号
により音声区間が誤検出されたりすることがなく適正な
振幅制御をすることができる。As is clear from the above explanation, according to the present invention, the amplitude of the input audio signal is adjusted only in the voice section, so that the voice section is not erroneously detected due to a noise signal, and appropriate amplitude control can be performed. can do.
第1図は、一般的な振幅調整回路の入出力特性図、第2
図は、一般的な振幅調整回路の一例を示す図、第3図は
、減衰器の減衰特性図、第4図は、本発明の一実施例を
説明するための電気的ブロック線図である。
2・・・減衰器、3・・・増幅器、4・・・レベル検出
器、6・・・バイアス回路、7・・・切り換え回路、8
・・・音声区間検出回路。Figure 1 is an input/output characteristic diagram of a general amplitude adjustment circuit;
3 is a diagram showing an example of a general amplitude adjustment circuit, FIG. 3 is an attenuation characteristic diagram of an attenuator, and FIG. 4 is an electrical block diagram for explaining an embodiment of the present invention. . 2... Attenuator, 3... Amplifier, 4... Level detector, 6... Bias circuit, 7... Switching circuit, 8
...Voice section detection circuit.
Claims (2)
器と、該振幅減衰器に縦続接続された増幅器と、該増幅
器の出力レベルを検出するレベル検出器とを有し、該レ
ベル検出器の出力信号により前記振幅減衰器を制御する
振幅調整回路において、前記音声iiJ号の音声区間を
制御する音声区間検出手段を具備し、該音声区間検出手
段からの音声区間検出信号によって前記レベル検出器の
出力をオン・オフして?′?声区間のみの音声信号の振
幅を調整するようにしたことを特徴とする振幅調整回路
。(1) It has an amplitude attenuator that sets the level of the audio signal to an appropriate value, an amplifier connected in cascade to the amplitude attenuator, and a level detector that detects the output level of the amplifier, and the level detector The amplitude adjustment circuit controls the amplitude attenuator using the output signal of the attenuator, and includes a voice section detection means for controlling the voice section of the voice No. iiJ, and detects the level based on the voice section detection signal from the voice section detection means. Turn the output of the device on and off? ′? An amplitude adjustment circuit that adjusts the amplitude of a voice signal only in a voice section.
のバイアスをり・えて制御することにより雑音イコ号の
レベルを信叶レベルより小さくおさえるようにしたこと
を特徴とする特許請求の範囲第(1)項に記載の振幅調
整回路。(2) Claims characterized in that the level of the noise equalization signal is kept lower than the signal level by controlling the amplitude attenuator by changing a constant bias in the noise section and the silent section. The amplitude adjustment circuit according to item (1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58208668A JPS60101599A (en) | 1983-11-07 | 1983-11-07 | Amplitude adjustment circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP58208668A JPS60101599A (en) | 1983-11-07 | 1983-11-07 | Amplitude adjustment circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60101599A true JPS60101599A (en) | 1985-06-05 |
Family
ID=16560071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP58208668A Pending JPS60101599A (en) | 1983-11-07 | 1983-11-07 | Amplitude adjustment circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60101599A (en) |
-
1983
- 1983-11-07 JP JP58208668A patent/JPS60101599A/en active Pending
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