Abstract:

SHARP collaborated with Waseda University from 1990 for 1-bit digital technology. SHARP had started to receive an order for the 1-bit digital amplifier ``SM-SX100'' on 20 August 1999. Until today, we have introduced the 1-bit digital amplifier for audio, flat panel TV (LCD TV), and PC. These 1-bit amplifiers provided low-pass filter for the final stage, which is provided after 1-bit digital switching. We have to achieve more good sound and reduce deterioration of this low-pass filter. We have introduced new 1-bit digital amplifier without this low-pass filter beginning this April. This means we controlled the 1-bit digital signal to directly operate the speaker. We have proved a better effect for sound to compare the new 1-bit digital amplifier with the PWM switching amplifier, the A-class amplifier and the 1-bit digital amplifier with low-pass filter. If we do not measure any improvement for this new 1-bit digital amplifier, it has large radiation noise. We had achieved a reduction to the limit level of FCC, Denanhou, etc.