Roll-off filter apparatus
AssigneeMatsushita Electric Industrail Co., Ltd.
InventorKouichi Honma
Life of this patent
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Abstract
Disclosed is a roll-off filter apparatus having a small size, a simplified circuit structure and consuming a small amount of power. In the roll-off filter apparatus attaining the above object of the invention, a ramp signal generated from a ramp pattern generator is inserted in each gap of a data input signal temporarily stored in a buffer circuit, and such a signal is filtered in a switched capacitor filter having a roll-off filter characteristic. The output signal of the switched capacitor filter is supplied to be temporarily stored in a bucket brigade device, and the output signal of the bucket brigade device is delivered at a desired signal rate.
Claims3
A roll-off filter apparatus comprising
- a buffer circuit of a first in first out type having an input for receiving a data input signal made up on data blocks with gaps therebetween, said buffer circuit also having an output,
- a ramp pattern generator having an output for supplying a rising and falling signal pattern in the form of a burst signal,
- a filter with an input and having a roll-off filter characteristic,
- switch means connected to said outputs of said buffer circuit and said ramp pattern generator and said input of said filter, said filter receiving at its input a signal from said switch means in which said rising and falling signal pattern is inserted in said gaps between each of said data blocks in said data input signal, and
- an analog storage device receiving the output signal of said filter as its input, said device having a variable input/output data transmission rate.
Dependencies are inferred from the claim text.