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Signal output circuit

一种信号输出、电路的技术，应用在电气元件、改进放大器以减少噪声影响、门控放大器等方向，能够解决噪音输出、控制器处理负担重、不能停止功能的控制定时和屏蔽功能的控制定时规定等问题，达到防止噪音的输出、降低端子数目的效果

Inactive Publication Date: 2005-02-09
MITSUMI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the processing load of the controller is too heavy.
[0020] Furthermore, when operating and controlling both the stop function and the mask function in accordance with the level of the stop signal, the control timing of the stop function and the control timing of the mask function cannot be correctly specified.
There is a problem of generating noise output when the amplifier is operating depending on the situation

Method used

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Examples

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Embodiment Construction

[0035] figure 1 It is a block diagram of an embodiment of the present invention.

[0036] The audio amplifier circuit 1 of this embodiment is composed of a single chip semiconductor integrated circuit, on which amplifier circuits 11, 12, and a function control circuit 13 are mounted. As external terminals, it has an input terminal Tin, output terminals Tout-, Tout+, stop control Terminal Tsd, terminal Tc. An input signal is supplied from the signal source 2 to the input terminal Tin through the capacitor C1, and a stop signal is supplied from the controller 4 to the stop control terminal Tsd. In addition, a speaker 3 is connected between the output terminals Tout- and Tout+. In addition, a capacitor C2 is connected to the terminal Tc.

[0037] The signal supplied to the input terminal Tin is supplied to the amplifier circuit 11. The amplifier circuit 11 is composed of resistors R1, R2, a differential amplifier circuit 21, and a switch circuit 22, and constitutes an inverting amp...

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PUM

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Abstract

Provided is a signal output circuit including a shut-down function of shutting down an operation of an internal circuit and a mute function of muting an input signal and capable of controlling the shut-down function and the mute function by using a single external control signal. The signal output circuit (1) for controlling an output of the input signal includes: a digital delay circuit (42) for delaying the control signal for controlling the operation of the internal circuit by means of digital processing; and switches (22, 32) for muting the input signal in response to a delay output of the digital delay circuit.

Description

Technical field [0001] The present invention relates to a signal output circuit, in particular to a signal output circuit having a stop function for stopping the operation of an internal circuit and a shielding function for shielding signals. Background technique [0002] The prior art has known an audio amplifier circuit that amplifies an audio signal and outputs it from a microphone or speaker. [0003] In such an audio amplifier circuit, a stop function and a shielding function are built in to cut off noise when the power is used or cut off. [0004] Figure 4 Shows the block diagram of the audio amplifier circuit. [0005] To the input terminal Tin of the audio amplifier circuit 101, an input signal is supplied from the signal source 102 through the DC blocking capacitor C41. The input signal supplied to the input terminal Tin is supplied to the amplifier circuit 111. The amplifier circuit 111 is composed of a differential amplifier circuit 121, an input resistor 31, a feedb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/00H03F3/72
CPCH03F3/72
Inventor 稻垣靖彦
Owner MITSUMI ELECTRIC CO LTD