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Shock Sound prevention circuit

A technology of impact sound and circuit, applied in the direction of TV, color TV, electrical components, etc., can solve the problem of impact sound interfering with beep sound, etc.

Inactive Publication Date: 2003-11-05
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, audio amplifiers typically produce a popping sound when powered on
So, the problem with the impact sound interfering with the beep

Method used

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Examples

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Embodiment Construction

[0016] Next, embodiments of the present invention will be described in detail with reference to the drawings. exist figure 1 Among them, 12 is a buffer for generating a reference voltage from the reference voltage capacitor C1, and 13 and 14 are first and second buffers to which the reference voltage from the buffer 12 is applied as a bias voltage.

[0017] In addition, 9 is a terminal that connects the output terminal of the first operational amplifier 4 and the output terminal of the first buffer 13, and 10 is a terminal that connects the output terminal of the second operational amplifier 7 and the output terminal of the second buffer 14. The common terminals, R6 to R8, are resistors that divide the power supply voltage Vcc by a resistor ratio and generate reference voltages at points A and B.

[0018] In addition, 15 is a first level comparator composed of transistors Q4, Q5 and resistor R4, which performs a level comparison between the reference voltage from the referen...

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PUM

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Abstract

A shock prevention circuit that stabilizes the BTL audio amplifier about 100msec after the power is turned on. The circuit includes: a reference voltage terminal (26), whose reference voltage rises in response to the power supply voltage being turned on; a first operational amplifier (4), which is applied with a reference voltage as a bias voltage, and amplifies the audio signal from the input terminal; The operational amplifier (7) is applied with a reference voltage from the reference voltage terminal (26) as a bias voltage to amplify the inverted signal of the audio signal applied on the first operational amplifier (4); the first and second buffers (13 , 14), the reference voltage is applied; the first output terminal (9), the output terminal of the first operational amplifier (4) and the output terminal of the first buffer (13) are connected; and the second output terminal (10) , connect the output terminal of the second operational amplifier (7) to the output terminal of the second buffer (7).

Description

technical field [0001] The present invention relates to a shock noise prevention circuit used in a BTL output type audio amplifier, and more particularly to a shock noise prevention circuit for an audio amplifier using two operational amplifiers biased by the same reference voltage. Background technique [0002] Some electronic imaging (camera) devices such as video cameras and digital cameras include liquid crystal monitors. If an LCD monitor is included, audio functionality is also required, and speaker functionality is also required. Therefore, for example, there is a speaker function that, when the user turns on the power, notifies the user that the power has been turned on by sound. [0003] This sound is called a beep, and it occurs about 100msec after the power is turned on. Furthermore, in electronic video (camera) machines, most power supply voltages are low. Therefore, a BTL method is used that can secure as much dynamic range as possible even at a low power sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/68H03F1/00H03F1/30H03G3/34
CPCH03F1/305H03G3/348
Inventor 羽山孝一
Owner SANYO ELECTRIC CO LTD
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