Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1998-12-04
2000-09-05
Phan, Trong
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341144, H03M 300, H03M 166
Patent
active
061149810
ABSTRACT:
There is provided an over-sampling D/A converter which has a mute function for fixing an average DC potential of an analog output signal to a predetermined potential, and comprises a .SIGMA. .DELTA. modulator for receiving a multibit digital signal to which a DC offset value is added and then outputting a one-bit non-return-to-zero signal, a signal generator for receiving the non-return-to-zero signal and the clock signal, then generating a return-to-zero signal which is a logical multiplication of the non-return-to-zero signal and the clock signal and a complementary signal of the return-to-zero signal which is a logical addition of the non-return-to-zero signal and an inverted signal of the clock signal, and then adding the return-to-zero signal to the complementary signal of the return-to-zero signal to thus output a polar-return-to-zero signal, and an analog filter for receiving the polar-return-to-zero signal and then outputting an analog signal. Accordingly, because an average DC potential of an output signal at the time of the mute operation-ON is set substantially equal to the average DC potential of the output signal at the time of the mute operation-OFF, variation in the average DC potential in the output signal due to ON/OFF of the mute operation can be prevented. As a result, generation of audible click noises can be prevented.
REFERENCES:
patent: 5594443 (1997-01-01), Lam
patent: 5627536 (1997-05-01), Ramirez
patent: 5821891 (1998-10-01), Shi et al.
patent: 5835043 (1998-11-01), Tsuchida et al.
Kabushiki Kaisha Toshiba
Phan Trong
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