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Programmable Noise Threshold for Audio Amplifiers Using Low Noise and Noise Rejection Combined Analog and Digital Signal Processing

A noise threshold and amplifier circuit technology, applied in the field of volume control circuit architecture, can solve problems such as degraded analog circuit performance

Inactive Publication Date: 2011-12-21
FAIRCHILD SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, switching noise from digital functions and noise from switching power functions add undesired circuit noise that can degrade the performance of analog circuits

Method used

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  • Programmable Noise Threshold for Audio Amplifiers Using Low Noise and Noise Rejection Combined Analog and Digital Signal Processing
  • Programmable Noise Threshold for Audio Amplifiers Using Low Noise and Noise Rejection Combined Analog and Digital Signal Processing
  • Programmable Noise Threshold for Audio Amplifiers Using Low Noise and Noise Rejection Combined Analog and Digital Signal Processing

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0071] Example 1 includes subject matter (e.g., an apparatus formed on a single IC) comprising a first signal circuit path for processing a first electrical signal comprising one or more signal frequencies in the audio frequency band, wherein the first A signal circuit path includes: a first amplifier circuit configured to provide a first output signal to a speaker load; a noise threshold circuit configured to monitor the first electrical signal and generating a first indication when falling below a first specified threshold voltage value; and a control circuit coupled in phase with the noise gate circuit and the first signal circuit path, wherein the control circuit is configured to determine the The output of the first signal path is attenuated.

[0072] In Example 2, the subject matter of Example 1 optionally includes a second circuit path for processing a second electrical signal and a third electrical signal each having a frequency in the audio frequency band, wherein the...

example 3

[0073] In Example 3, the first amplifier circuit of one or any combination of Examples 1 to 2 may optionally be a switching amplifier circuit configured to provide a first output signal to be connected between the circuit power supply and the IC ground switching between speaker loads, and the noise threshold circuit may optionally include: a charge pump circuit coupled in phase with the second and third amplifier circuits, wherein the charge pump is configured to generate The positive and negative power supply rails of the three-amplifier circuit; and a discrete-time low-pass filter circuit configured to filter the first electrical signal and at least one of the second and third electrical signals, wherein the discrete-time The sampling rate of the temporal filter reduces aliasing noise at zero hertz (0 Hz) due to switching of the switching amplifier and the charge pump circuit.

[0074] In Example 4, the switching frequency of the charge pump circuit of Example 3 may optional...

example 5

[0075] In Example 5, the output of the noise gate circuit of one or any combination of Examples 1 to 4 may optionally include a finite impulse response (FIR) low-pass filter to smooth the noise in the first and second indications. Generation of at least one.

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Abstract

An apparatus includes a first signal circuit path, a noise gate circuit, and a control circuit. The first signal circuit path processes a first electrical signal comprising one or more signal frequencies in the audio frequency band. The first signal circuit path includes a first amplifier circuit configured to provide a first output signal to a speaker load. A noise threshold circuit monitors the first electrical signal and generates a first indication when the magnitude of the first electrical signal falls below a first prescribed threshold voltage value. The output of the first signal path is attenuated according to the generated indication. The devices are formed on a single integrated circuit.

Description

[0001] priority claim [0002] This application is based on 35 U.S.C.§119(e) requesting Young III to submit on April 11, 2010 entitled "A PROGRAMMABLE NOISE GATE FOR AUDIO AMPLIFIEREMPLOYING A COMBINATION OF LOW-NOISE AND NOISE-REJECTING ANALOGAND DIGITAL SIGNAL PROCESSING" in the United States Provisional Application No. 61 / 325,420 (Attorney Docket No. 2921.070PRV), the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to volume control circuit architectures including automatic gain control, zero crossing, ramp and noise threshold circuits. Background technique [0004] Personal electronic devices include MP3 portable media players, cellular phones and smart phones. The convenience of these devices lies in the functionality they provide in a small size. Because these devices are battery powered, there is a design tradeoff between size and the amount of operating time before the battery needs to be replace...

Claims

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Application Information

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IPC IPC(8): H03G3/20H03G3/10H03G1/04
CPCH04R2430/01H04R5/04H03G3/341H04R3/00H03F3/217H03G7/02
Inventor 胡伯特·杨III
Owner FAIRCHILD SEMICON CORP
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