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Transient-inhibiting audio-frequency circuit and method

A circuit and audio signal technology, applied in electrical components, low-frequency amplifiers, amplifiers with semiconductor devices/discharge tubes, etc., can solve problems such as click sound, working channel crosstalk, etc. Effects of offset or distortion, subtracted transients

Inactive Publication Date: 2003-11-19
WOLFSON MICROELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the load is reconnected, any charging transient to C1 130 will produce a transient on the output node X128 that cannot be fully canceled by the decoupling action of capacitor C2 110
This condition can cause crosstalk and "clicks" in the working channel

Method used

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  • Transient-inhibiting audio-frequency circuit and method
  • Transient-inhibiting audio-frequency circuit and method
  • Transient-inhibiting audio-frequency circuit and method

Examples

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Embodiment Construction

[0046] In general, in an example of the invention, the output of an amplifier or buffer (or output of a filter or other signal processing circuit) in the circuit is disconnected from the circuit in standby mode. Although in general the output node voltage of the circuit will be pulled to the main power supply voltage (for example, pulled down) by one or more resistance elements in the circuit, due to the addition of elements matching these resistance elements in the design of the present invention , so the output node voltage is pulled back to a quiescent voltage or a non-signal voltage. The resistive elements that pull the output voltage to the main supply voltage are usually elements of the feedback circuit, which may be one or more resistors; the matching elements to these resistive elements are preferably matched resistors, and those experienced in the industry will understand what is said here The "matched" does not necessarily mean "equal", but refers to using matched re...

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PUM

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Abstract

This invention is generally concerned with audio transient suppression circuits and methods and is particularly applicable to the suppression of an audio transient when an amplifier is switched between an active and a standby mode. An audio signal processing circuit (300) with two modes, a first mode in which the circuit operates to provide an audio signal output and a second mode in which said audio signal output is suppressed, the circuit comprising at least one active signal processing stage having an output node (128), the output node having a dc signal path to a first dc voltage (104), said dc signal path including at least one first resistive element (122, 124), the circuit further comprising an output signal transient suppressor, said transient suppressor comprising a second resistive element (304) switchably connected (302) between a second dc voltage (102) and said output node, said second resistive element having a resistance selected such that when said second resistive element is connected the voltage on said output node in said second mode is substantially equal to a quiescent voltage on said output node in said first mode.

Description

technical field [0001] The present invention relates to audio transient suppression circuits and methods, particularly for suppressing audio transients when switching an amplifier between active and standby modes. Background technique [0002] When audio equipment, such as a power amplifier, is switched, transients are often generated at the output. This condition can lead to "thump" on power-up, which can give the impression that the equipment is not perfect and, in the case of power amplifiers, can damage the speakers. A common way to reduce this power-on thump is to temporarily disconnect the output of the power amplifier (using a relay, for example) during power-up. However, this solution usually does not work satisfactorily, for example if the output load is referenced to ground and is AC-coupled. Also, the situation described above is very common in modern audio equipment designs, and internal components may only be partially powered when switching in and out of stan...

Claims

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Application Information

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IPC IPC(8): H03F1/14H03F1/30H03F3/181
CPCH03F1/305H03F3/181H03F1/14
Inventor 彼德·约翰·佛瑞斯
Owner WOLFSON MICROELECTRONICS LTD
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