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US3920974A Expired / Lapsed US ⏱️ 0.0 years remaining

Discrete cosine transform signal processor

Assignee: United States Department of the Navy
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Filing: 1974-10-15
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Granted: 1975-11-18
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Expires: 1994-10-15
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Abstract

Abstract A processor for performing a discrete cosine transform of an input signal, suitable for real-time television image processing, specifically for obtaining an acceptable picture when the number of bits of information available for describing the picture and/or the channel bandwidth are severely limited, comprising: two complex read-only memories, an input and output read-only memory, each containing a predetermined number of data points arranged in a predetermined manner; two complex multipliers, an input and an output multiplier, each having an input from one of the read-only memories, an input which is connectable to the external signal of N data values which is to be transformed discretely and cosinusoidally; a complex transversal filter, having 2N-1 taps, the input to the filter being the output of the input multiplier; the output of the transform processor comprising the output of the output multiplier.

Inventors

  • 👤 Robert W Means

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 22:51
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/60; G; G06; G06G; G06G7/00; G06G7/12; G06G7/22

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 118 words
A signal processor for performing the discrete cosine transform of an input signal having N samples, comprising: two complex read-only memories, an input and output read-only memory, each containing a total number N of data points arranged in a predetermined manner; two complex multipliers, an input and an output multiplier, each having an input from one of the read-only memories, the input multiplier having an input which is connectable to the external signal which is to be transformed discretely and cosinusoidally; and a complex transversal filter, having 2N-1 taps, the input to the filter being the output of the input multiplier; the output of the transform processor comprising the real part of the output of the output multiplier.
Claim 2
Dependent Claim 118 words
A signal processor for performing the discrete cosine transform of an input signal having N samples, comprising: two complex read-only memories, an input and output read-only memory, each containing a total number N of data points arranged in a predetermined manner; two complex multipliers, an input and an output multiplier, each having an input from one of the read-only memories, the input multiplier having an input which is connectable to the external signal which is to be transformed discretely and cosinusoidally; and a complex transversal filter, having 2N-1 taps, the input to the filter being the output of the input multiplier; the output of the transform processor comprising the real part of the output of the output multiplier.
Claim 3
Dependent Claim 29 words
The processor, according to claim 1, further comprising: means connected to the read-only memories, multipliers and filter for controlling the timing or sequencing of these three types of circuits.
Claim 4
Dependent Claim 34 words
The processor for performing a discrete cosine transform of an input signal according to claim 1, wherein: the input read-only memory has stored within it data samples corresponding to 0.5 for n 0 and
Claim 5
Dependent Claim 34 words
The processor for performing a discrete cosine transform of an input signal according to claim 1, wherein: the input read-only memory has stored within it data samples corresponding to 0.5 for n 0 and

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-11-17 1979-05-19 1979-11-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-11-17 1983-05-19 1983-11-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-11-17 1987-05-19 1987-11-18 $7700.00 Window Closed / Lapsed

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