Title :
Microprocessor-assisted audio signal processing system for VHS VCRs
Author :
Yamada, Kunihiro ; Kojima, Masanori ; Furukawa, Teruo ; Sato, Fumiaki ; Mizuno, Tadanori
Author_Institution :
Mitsubishi Electr. Semicond. Syst. Corp., Japan
fDate :
5/1/2001 12:00:00 AM
Abstract :
This paper describes a method of changing the time constant using gain control for playback 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 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 performance in frequency characteristics and 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
Keywords :
BiCMOS digital integrated circuits; audio signal processing; digital signal processing chips; equalisers; gain control; video tape recorders; BiCMOS process; VHS VCR; attack time; audio signal processing system; automatic level controller; bipolar IC; equivalent frequency characteristic; gain control; microprocessor-assisted processing; playback equalizers; pop noise; recovery time; standard model; time constant; Automatic control; Automatic logic units; Bipolar integrated circuits; Equalizers; Frequency; Gain control; Integrated circuit modeling; Signal processing; Standards development; Video recording;
Journal_Title :
Consumer Electronics, IEEE Transactions on
