Background noise generating apparatus

Details Background noise generating apparatus Background noise generating apparatus

1995-12-06

1998-03-03

Malzahn, David H.

Boots, shoes, and leggings

G06F 102

Patent

active

057242771

ABSTRACT:
An object of the invention is to provide a background noise generating circuit having a small circuit scale and a small power consumption and capable of setting an arbitrary gain for the background noise. For each frame clock, a circuit (6, 5) generates a gain setting code signal S5 in synchronism with a data clock, and a random generator 21 generates a random number S21 in synchronism with a frame clock FCK. For a period of each frame, a logic gate 22 generates an exclusive-OR between the gain setting code signal S5 and the random number S21, the exclusive-OR constituting a background noise signal S9, which is supplied to a signal processing circuit 7 through a selection circuit 4 during a background noise period. Th gain setting code signal S5 may be determined by detecting the level of a received signal during a received signal input period just before the background noise period, and the gain setting code signal S5 thus determined is held during the background noise period and continues to be supplied to the logic gate.

REFERENCES:
patent: 5121349 (1992-06-01), Naito
patent: 5570307 (1996-10-01), Takahashi

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