Digital filter

Details Digital filter Digital filter

1992-07-28

1994-06-07

Nguyen, Long T.

Boots, shoes, and leggings

36472413, G06F 1531

Patent

active

053195841

ABSTRACT:
A digital filter can de-emphasize pre-emphasized signals without an extra processing routine or hardware. Via a second bus 21, a decision unit 19 receives a record status signal out of digital audio signals input by an input-output unit 24, thereby checking whether or not the received signals have been pre-emphasized. When the signals have been pre-emphasized, the decision unit 19 selects a set K2 of multiplication coefficients (a.sub.0, a.sub.1 and a.sub.2). Otherwise, the decision unit 19 selects the other set K1 of multiplication coefficients (-1, 0, 0). In the former case, the input signals are de-emphasized. In the latter case, a transmission function is "-1", so that the input signals are multiplied by "-1", i.e. no de-emphasizing process is carried out.

REFERENCES:
patent: 4668988 (1987-05-01), Sasaki et al.
patent: 4766561 (1988-08-01), Thompson et al.
patent: 5142489 (1992-08-01), Yamaki
patent: 5157760 (1992-10-01), Akagiri

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