Optimized Volume Control Architecture for Cascaded Audio System

• Cascaded audio systems (CASs) widely exist in consumer electronics, within which volume control is one of the most basic functions. However, the current volume adjustment schemes cannot automatically achieve optimal control, leading to performance degradation of CASs. Meanwhile, there is a lack of mathematical models and quantitative analysis between CASs performance and volume control position. In this study, an optimal volume control architecture named local processing and amplification (LPA) is proposed to minimize the volume control's adverse impact on CASs' performance automatically. First, a general CAS model is established through effective analysis and reasonable equivalence of diverse complicated CASs. Second, the quantitative relationship between the volume control and the CAS performance is theoretically analyzed using the noise figure theory, hence, the LPA architecture is proposed. Finally, the proposed LPA's performance improvement effect is analyzed and compared with the other volume controls in a wide volume range. Simulations and experiments using multiple indexes show that the signal-to-noise ratio (SNR) and the total harmonic distortion plus noise (THD+N) improvement of the proposed architecture are up to 5.2 dB and 4.8 dB, respectively, under a typical -9 dB volume.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

TV

Signal to noise ratio

Audio systems

Performance evaluation

Gain

Process control

Control systems

Volume control

cascaded audio system (CAS)

audio signal chain

noise figure

local processing and amplification (LPA)

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