Microprocessor-assisted audio signal processing system for VHSVCRs

Keita Yamada

doi:10.1109/30.964103

2001-05-01

PRE

DOI：10.1109/30.964103

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摘要

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This paper describes a method of changing the time constant using gain control for equalizers and automatic level controller (ALC) of VHS VCRs using microprocessor-assisted processing. In the case of bipolar IC for a standard model, a total of 10 time constants which consist of external components are required. However, the experimental results of a VCR developed using this new method significantly reduced these time constants to 2. That is, it was confirmed that this method has an equivalent frequency characteristics and the recovery time to the standard model. Moreover, the attack time was shortened to 1/20 of the standard model, therefore the pop noise was decreased. The proposed method is suitable for system on a chip (SOC) using a BiCMOS process.