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Audio differential signal implementation method

A technology of differential signal and realization method, which is applied in the direction of amplification control, transducer circuit, sensor, etc., can solve the problem that the linear control method cannot be used, and achieve the effect of driving improvement and meeting the requirements of output signal quality

Inactive Publication Date: 2016-06-29
王丽香
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the relationship between human hearing and sound volume conforms to the law of logarithmic curves, linear control methods cannot be used.

Method used

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  • Audio differential signal implementation method

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Embodiment Construction

[0025] According to the principles of the present invention, there are several ways to detect and implement a single-ended / differential audio amplifier that amplifies the input signal to a signal equal to the output; the interface connector between the systems should have at least five pins pins to provide differential signals. It should be noted that the common ground connection between the two devices is very important. On the surface, since the signal is DC isolated, the AC-coupling capacitor does not need to be grounded, but practical experience has shown that grounding is necessary to provide ideal noise performance.

[0026] The first problem to solve is to detect whether the input is a single-ended or differential signal. Two of the many circuits use one of the external pins of the connector to test the DC level of the input signal. Specifying one external pin of the connector is easy, but not feasible for space-constrained applications. source device or leave the pi...

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Abstract

The invention discloses an audio differential signal implementation method, and the method comprises the following steps: detecting an input differential signal: transmitting an input signal to a low-pass filter and then inputting the input signal to a comparator; and enabling an original input signal to be separated as the 50%-25% of a DC level. The implementation of the differential signal comprises a single-end mode and a differential mode. In the single-end mode, the differential input does not generate a signal, a positive phase input is allowed to be set as 0.5Vcc, and an analog switch remains off, so as to enable an amplifier to output double gain. In the differential mode, the analog switch is switched on, the output gain of the amplifier is 1. The method can achieve an audio system which supports single-end and differential input modes, especially for a differential signal referring to volume control. The method also can achieve the improvement of the drive of the whole system according to the actual needs, so as to meet the demands of the quality of an output signal.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a design method of an audio differential signal. Background technique [0002] The number of portable devices has exploded and many new functions have been added. Portable devices with external speaker audio playback functions are increasing, such as MP3 players, mobile phones with MP3 functions or speakers, and portable CD players. The output of these systems varies depending on the configuration and driver. But the output of these systems varies in configuration and drive. [0003] The output of an MP3 player or a cell phone is a single-ended signal that can drive a 32Ω headphone speaker. The speaker impedance of a typical external speaker system is 4 to 8Ω, and each channel may have multiple speakers. However, 32Ω drivers are difficult to drive these low-impedance speakers and cannot provide sufficient volume for end users. [0004] External speaker systems vary in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/00H03G3/20
Inventor 王丽香
Owner 王丽香