US 5,862,070 AGranted

Discrete cosine transformation circuit

AssigneesYozan Inc., Sharp Kabushiki Kaisha

InventorsGuoliang Shou, Jie Chen, Chanming Zhou, Sunao Takatori

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Abstract

A high-speed discrete cosine transformation circuit includes the one-dimensional input signals x(0) to x(7) being input in parallel to the positive input terminals "+" or the negative input terminals "-" of eight neural operation units (NOU) 11 to 18 through capacitors d0 to d6. In each NOU 11 to 18, input signals x(0) to x(7) are added and subtracted. Input signals x(0) to x(7) are multiplied beforehand by the coefficient in proportion to the capacities of capacitors d0 to d6 which are connected to NOU 11 to 18. Thereafter, discrete cosine transforming coefficients y(0) to y(7) are output. A two-dimensional discrete cosine transformation circuit is realized by using the one-dimensional discrete cosine transforming circuit.

Claims4

Dependent claims

A one-dimensional discrete cosine transformation circuit for generating an output of discrete transformation from N (wherein N is a positive integer) number of input voltage terminals for respectively receiving N input voltages comprising:

N number of operational units each of which comprises:
i) a positive input terminal;
ii) a negative input terminal;
iii) an output terminal;
iv) a first inverting amplifier having an input and an output, said input of the first inverting amplifier being connected to said positive input terminal;
v) a first feedback capacitance connected between said input and said output of said first inverting amplifier;
vi) an intermediate capacitance having an input and an output;
vii) said input of the intermediate capacitance being connected to said output of said first inverting amplifier;
viii) a second inverting amplifier having an input and an output, said input of the second inverting amplifier being connected to said output of said intermediate capacitance and to said negative input terminal, said output of the second inverting amplifier being connected to said output terminal, and
ix) a second feedback capacitance connected between said input and said output of said second inverting amplifier;
and
N number of capacitances corresponding to said input voltages each of which is connected between one of said input voltage terminals and one of said positive and negative input terminals and respectively having capacities according to coefficients of said discrete cosine transformation.

9 more elements

Dependencies are inferred from the claim text.