JPS6337526B2 - - Google Patents
Info
- Publication number
- JPS6337526B2 JPS6337526B2 JP59121363A JP12136384A JPS6337526B2 JP S6337526 B2 JPS6337526 B2 JP S6337526B2 JP 59121363 A JP59121363 A JP 59121363A JP 12136384 A JP12136384 A JP 12136384A JP S6337526 B2 JPS6337526 B2 JP S6337526B2
- Authority
- JP
- Japan
- Prior art keywords
- attenuator
- voltage
- amplifier
- resistor
- voltage controlled
- 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
Links
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000003908 quality control method Methods 0.000 claims 1
- 230000005236 sound signal Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
Landscapes
- Circuit For Audible Band Transducer (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Description
【発明の詳細な説明】
本発明はスピーカの駆動系の運動を検出し、こ
れを増幅器の入力に帰還することにより、振動系
の運動を制御し、目標とする音響特性を得るモー
シヨナルフイードバツク（以下MFBと略す）方
式の音質調整装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention detects the movement of the speaker drive system and feeds it back to the input of the amplifier, thereby controlling the movement of the vibration system and obtaining the target acoustic characteristics. This invention relates to a back (hereinafter abbreviated as MFB) type sound quality adjustment device.
その目的とするところは、出力音圧の大小に対
応して低音部分の再生周波数帯域を変化させ、聴
感上常に最適の音響特性を得る装置を提供しよう
とするものである。 The purpose is to provide a device that changes the reproduction frequency band of the bass part in response to the magnitude of the output sound pressure, and that always obtains the optimum acoustic characteristics in terms of hearing.
音響再生装置における低域再生周波数特性を改
善する方法として、MFB装置が知られており、
各種の方式が提案されている。例えばブリツジ型
MFBは第１図に示す如く増幅器３、スピーカ５
を一辺とするブリツジ４、帰還回路６で構成され
ており、入力端子１から可変減衰器２を通り増幅
器３で増幅した信号でスピーカ５を駆動し、この
時にブリツジ４の出力として得られるスピーカ振
動系の速度に比例した電圧を帰還回路６で各種の
変換をして増幅器３の入力側へ帰還することで所
望の音響特性を得るものである。 MFB devices are known as a method for improving the low frequency reproduction characteristics of sound reproduction devices.
Various methods have been proposed. For example, bridge type
The MFB has an amplifier 3 and a speaker 5 as shown in Figure 1.
It consists of a bridge 4 with one side of A feedback circuit 6 performs various conversions on a voltage proportional to the speed of the system and feeds it back to the input side of the amplifier 3, thereby obtaining desired acoustic characteristics.
本発明は、上記帰還回路に微分特性を持たせて
速度に比例した検出信号を加速度に変換した信号
と、増幅器出力端子から得た信号とを音響再生装
置の音量を調整する可変減衰器と連動する電圧制
御減衰器で調整する回路構成とする事によつて、
出力電圧に対応してスピーカから放射される音響
特性を可変するものであり、本発明の一実施例に
ついて第２図とともに説明する。なお第２図にお
いて、第１図と同一機能の部分については、同一
番号で示している。 The present invention provides differential characteristics to the feedback circuit to convert a detection signal proportional to speed into acceleration, and the signal obtained from the amplifier output terminal is linked to a variable attenuator that adjusts the volume of the sound reproduction device. By using a circuit configuration that adjusts with a voltage controlled attenuator,
The acoustic characteristics radiated from the speaker are varied in accordance with the output voltage, and one embodiment of the present invention will be described with reference to FIG. 2. In FIG. 2, parts having the same functions as those in FIG. 1 are indicated by the same numbers.
第２図において１１は電源端子で電源電圧が加
えられている。１２は可変減衰器２と連動して動
作する第２の可変減衰器で、電圧制御減衰器１４
の減衰度を可変減衰器２に対応して変化させる。
抵抗R1，R2はその分割比によつて増幅器３の増
幅度を決定する負帰還回路、１３は微分特性を持
つたMFB帰還回路で、ブリツジ４との組合せで
加速度MFB回路を構成している。なお電圧制御
減衰器１４の抵抗値RDは、可変減衰器１２から
加えられる電圧が最小の時は、RD＞R2。又、電
圧が最大の時はRD＜R2となる様に設定してお
く。 In FIG. 2, reference numeral 11 denotes a power supply terminal to which a power supply voltage is applied. 12 is a second variable attenuator that operates in conjunction with the variable attenuator 2;
The degree of attenuation is changed in accordance with the variable attenuator 2.
Resistors R 1 and R 2 are negative feedback circuits that determine the amplification degree of the amplifier 3 according to their division ratios, and 13 is an MFB feedback circuit with differential characteristics, which in combination with the bridge 4 constitutes an acceleration MFB circuit. There is. Note that the resistance value RD of the voltage-controlled attenuator 14 is RD>R 2 when the voltage applied from the variable attenuator 12 is the minimum. Also, set it so that RD<R 2 when the voltage is maximum.
次に第２図の構成における動作について説明す
る。今、可変減衰器２の摺動子が接地側近くに有
る時は、第２の可変減衰器１２の摺動子も接地側
近くにあるため、電圧制御減衰器１４の抵抗値
RDは最大となる。従つて、R1，R2で分割されて
負帰還される信号は小さく、ブリツジ４で検出さ
れ、MFB帰還回路１３を通つたレベルの大きな
信号が、増幅器３の入力端子に帰還される。この
時増幅器３の出力端子には、第３図にＡで示され
る様な電圧が得られ、スピーカ５からは、第４図
Ａに示す様な音圧が得られる。 Next, the operation of the configuration shown in FIG. 2 will be explained. Now, when the slider of the variable attenuator 2 is near the ground side, the slider of the second variable attenuator 12 is also near the ground side, so the resistance value of the voltage-controlled attenuator 14
RD becomes maximum. Therefore, the signal divided by R 1 and R 2 and fed back negatively is small, and the signal detected by the bridge 4 and the large level signal that passes through the MFB feedback circuit 13 is fed back to the input terminal of the amplifier 3. At this time, a voltage as shown by A in FIG. 3 is obtained at the output terminal of the amplifier 3, and a sound pressure as shown in FIG. 4 is obtained from the speaker 5.
次に可変減衰器２の摺動子２が最大の位置、つ
まり入力端子１と直結された位置に有る場合には
第２の可変減衰器１２を通つて、電圧制御減衰器
１４に加えられる電圧は最大となり、電圧制御減
衰器１４の抵抗値RDは最少値となる。従つて、
R1，R2で分割されて増幅器３の入力端子に加え
られる信号は最大となり、MFB負帰還回路の出
力インピーダンスと、電圧制御減衰器１４の抵抗
値RDで分割されるため、最少となつて、増幅器
３の入力端子に加えられる。この時増幅器３の出
力端子には、第３図にＢで示される様な電圧が得
られ、スピーカ５からは第４図にＢに示す様な音
圧が得られる。 Next, when the slider 2 of the variable attenuator 2 is at the maximum position, that is, the position where it is directly connected to the input terminal 1, the voltage is applied to the voltage-controlled attenuator 14 through the second variable attenuator 12. is the maximum value, and the resistance value RD of the voltage controlled attenuator 14 is the minimum value. Therefore,
The signal divided by R 1 and R 2 and applied to the input terminal of the amplifier 3 becomes the maximum, and the signal divided by the output impedance of the MFB negative feedback circuit and the resistance value RD of the voltage controlled attenuator 14 becomes the minimum. , is applied to the input terminal of amplifier 3. At this time, a voltage as shown by B in FIG. 3 is obtained at the output terminal of the amplifier 3, and a sound pressure as shown by B in FIG. 4 is obtained from the speaker 5.
なお、電圧制御減衰器１４の具体的な実施例を
示せば第５図の如くであり、トランジスタで構成
する事が出来る。また、負帰還路の結合コンデン
サの容量は十分大きなものが望ましく、この容量
によつて周波数特性を持たせないように構成する
ことにより、入力信号の周波数特性に影響を及ぼ
さないようにすることができる。 A specific example of the voltage controlled attenuator 14 is shown in FIG. 5, and can be constructed from a transistor. In addition, it is desirable that the capacitance of the coupling capacitor in the negative feedback path is sufficiently large, and by configuring the capacitance so that it does not have any frequency characteristics, it is possible to prevent it from affecting the frequency characteristics of the input signal. can.
以上述べた如く、本発明の音質調整装置によれ
ば、電圧制御減衰器を介してスピーカに印加され
る信号を帰還させているが、この帰還路には第
１、第２の減衰器はなく、その特性によつて、こ
の入力信号の周波数特性に影響が及ぼされること
がなく、本発明は、スピーカから放射される音圧
に応じて、忠実に入力信号の周波数特性を連続的
に可変出来るものである。また、増幅器の近くに
電圧制御減衰回路を設けることができ、減衰を直
流制御で行うことができるので他の回路の影響を
受けにくく、回路を安定に保つことができます。 As described above, according to the sound quality adjustment device of the present invention, the signal applied to the speaker is fed back via the voltage-controlled attenuator, but there are no first and second attenuators in this feedback path. Due to its characteristics, the frequency characteristics of this input signal are not affected, and the present invention can faithfully and continuously vary the frequency characteristics of the input signal according to the sound pressure emitted from the speaker. It is something. Additionally, a voltage-controlled attenuation circuit can be installed near the amplifier, and attenuation can be controlled by direct current, making it less susceptible to the effects of other circuits and keeping the circuit stable.
第１図は従来のMFB方式の音響再生装置のブ
ロツク図、第２図は本発明の一実施例における音
質調整装置のブロツク図、第３図，第４図はそれ
ぞれ同装置の動作説明図、第５図は同装置の電圧
制御減衰器の電気回路図である。
１…入力端子、２…可変減衰器、３…増幅器、
４…ブリツジ、５…スピーカ、１１…電源端子、
１２…可変減衰器、１３…帰還回路、１４…電圧
制御減衰器。
Fig. 1 is a block diagram of a conventional MFB type sound reproduction device, Fig. 2 is a block diagram of a sound quality adjustment device according to an embodiment of the present invention, and Figs. 3 and 4 are explanatory diagrams of the operation of the same device. FIG. 5 is an electrical circuit diagram of the voltage controlled attenuator of the same device. 1...Input terminal, 2...Variable attenuator, 3...Amplifier,
4...Bridge, 5...Speaker, 11...Power terminal,
12... Variable attenuator, 13... Feedback circuit, 14... Voltage controlled attenuator.
Claims (1)
調整する第１の減衰器と、この第１の減衰器に連
動するようにされた音質制御用の第２の減衰器
と、この第２の減衰器により減衰度が制御される
電圧制御減衰器と、前記音声増幅器の出力端に一
端を接続された第１の抵抗と、第１の抵抗の他端
に一端が接続されるとともに他端が接地された第
２の抵抗と、前記電圧制御減衰器の減衰作用を行
うトランジスタのエミツタに一端が接続され、第
１、第２の抵抗の接続点に他端が接続され、前記
音声増幅器の負帰還回路を構成する結合コンデン
サと、出力端子が前記電圧制御減衰器のトランジ
スタのコレクタに接続された加速度MFB回路と
を具備してなる音質調整装置。1. A first attenuator that adjusts the level of the audio signal applied to the audio amplifier, a second attenuator for sound quality control that is linked to the first attenuator, and the second attenuator. a voltage controlled attenuator whose attenuation degree is controlled by a voltage controlled attenuator; a first resistor having one end connected to the output end of the audio amplifier; one end connected to the other end of the first resistor and the other end being grounded. one end is connected to a second resistor and the emitter of a transistor that performs an attenuation effect of the voltage controlled attenuator, and the other end is connected to the connection point of the first and second resistors, and the negative feedback circuit of the audio amplifier and an acceleration MFB circuit having an output terminal connected to a collector of a transistor of the voltage-controlled attenuator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59121363A JPS6016710A (en) | 1984-06-13 | 1984-06-13 | Sound quality adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59121363A JPS6016710A (en) | 1984-06-13 | 1984-06-13 | Sound quality adjusting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6016710A JPS6016710A (en) | 1985-01-28 |
| JPS6337526B2 true JPS6337526B2 (en) | 1988-07-26 |
Family
ID=14809393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59121363A Granted JPS6016710A (en) | 1984-06-13 | 1984-06-13 | Sound quality adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6016710A (en) |
-
1984
- 1984-06-13 JP JP59121363A patent/JPS6016710A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6016710A (en) | 1985-01-28 |
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