Non-linear signal processing apparatus
First Claim
1. A non-linear signal processing apparatus comprising:
- a first signal processing circuit for processing an apparatus input signal in a predetermined manner to provide an output signal;
a non-linear signal processing network including a differential circuit for generating an output signal by extracting a variation in a predetermined time period from the output signal of said first signal processing circuit, a non-linear circuit for receiving an input signal and for generating in response thereto an output signal having an amplitude that is non-linearly compressed in accordance with the amplitude of the input signal to the non-linear circuit, a delay circuit for generating an output signal by delaying the output signal of said non-linear circuit by a predetermined time period, an adder circuit for combining the output signal of said delay circuit and the output signal of said differential circuit and supplying the combined signal to said non-linear circuit as the input signal received by the non-linear circuit, and a multiplier circuit for multiplying the output signal of said non-linear circuit by a predetermined factor to provide an output signal of said non-linear signal processing network, wherein said non-linear circuit has a multiplication factor that is non-linear, said output signal of said non-linear circuit being not only outputted through said multiplier circuit to exhibit a first compression effect, but also being fed back through said delay circuit to increase a second compression effect;
a second signal processing circuit for processing the output signal of said non-linear signal processing network in a predetermined manner to provide an output signal; and
an arithmetic operation circuit for arithmetically combining the output signal of said second signal processing circuit and said apparatus input signal.
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Accused Products
Abstract
A non-linear signal processing apparatus used in a video tape recorder or a video disk player is disclosed. The time variation of an input signal or a processed version thereof is non-linearly processed by a differential circuit and a closed loop including a non-linear circuit. The non-linearly processed time variation of the signal or a processed version thereof is arithmetically combined with the input signal. Thus, the same non-linear characteristic as that obtained by the prior art analog signal technique is attained by the digital signal processing technique, which is superior in integrity and stability. By appropriately selecting the characteristic of the non-linear circuit, better results than those obtainable by the analog signal processing technique are achieved.
17 Citations
41 Claims
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1. A non-linear signal processing apparatus comprising:
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a first signal processing circuit for processing an apparatus input signal in a predetermined manner to provide an output signal; a non-linear signal processing network including a differential circuit for generating an output signal by extracting a variation in a predetermined time period from the output signal of said first signal processing circuit, a non-linear circuit for receiving an input signal and for generating in response thereto an output signal having an amplitude that is non-linearly compressed in accordance with the amplitude of the input signal to the non-linear circuit, a delay circuit for generating an output signal by delaying the output signal of said non-linear circuit by a predetermined time period, an adder circuit for combining the output signal of said delay circuit and the output signal of said differential circuit and supplying the combined signal to said non-linear circuit as the input signal received by the non-linear circuit, and a multiplier circuit for multiplying the output signal of said non-linear circuit by a predetermined factor to provide an output signal of said non-linear signal processing network, wherein said non-linear circuit has a multiplication factor that is non-linear, said output signal of said non-linear circuit being not only outputted through said multiplier circuit to exhibit a first compression effect, but also being fed back through said delay circuit to increase a second compression effect; a second signal processing circuit for processing the output signal of said non-linear signal processing network in a predetermined manner to provide an output signal; and an arithmetic operation circuit for arithmetically combining the output signal of said second signal processing circuit and said apparatus input signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-linear signal processing apparatus comprising:
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a first signal processing circuit for processing an apparatus input signal in a predetermined manner to provide an output signal; a non-linear signal processing network including a differential circuit for generating an output signal by extracting a variation in a predetermined time period from the output signal of said first signal processing circuit, a non-linear circuit for receiving an input signal and for generating in response thereto an output signal having an amplitude that is non-linearly compressed in accordance with the amplitude of the input signal to the non-linear circuit, a delay circuit for generating an output signal by delaying the output signal of said non-linear circuit by a predetermined time period, an adder circuit for combining the output signal of said delay circuit and the output signal of said differential circuit and supplying the combined signal to said non-linear circuit as the input signal received by the non-linear circuit, and a multiplier circuit for multiplying the output signal of said non-linear circuit by a predetermined factor to provide an output signal of said non-linear processing network, wherein said non-linear circuit has a multiplication factor that is non-linear, said output signal of said non-linear circuit being not only outputted through said multiplier circuit to exhibit a first compression effect, but also being fed back through said delay circuit to increase a second compression effect; and an arithmetic operation circuit for arithmetically combining the output signal of said non-linear signal processing network and said apparatus input signal. - View Dependent Claims (11, 12)
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13. A non-linear signal processing apparatus comprising:
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a non-linear signal processing network including a differential circuit for generating an output signal by extracting a variation in a predetermined time period from an input signal thereto, a non-linear circuit for receiving another input signal and for generating in response thereto an output signal having an amplitude that is non-linearly compressed in accordance with the amplitude of the input signal to the non-linear circuit, a delay circuit for generating an output signal by delaying the output signal of said non-linear circuit by a predetermined time period, an adder circuit for combining the output signal of said delay circuit and the output signal of said differential circuit and supplying the combined signal to said non-linear circuit as the input signal received by the non-linear circuit, and a multiplier circuit for multiplying the output signal of said non-linear circuit by a predetermined factor to provide an output signal of said non-linear signal processing network, wherein said non-linear circuit has a multiplication factor that is non-linear, said output signal of said non-linear circuit being not only outputted through said multiplier circuit to exhibit a first compression effect, but also being fed back through said delay circuit to increase a second compression effect; a signal processing circuit for processing the output signal of said non-linear signal processing network in a predetermined manner to provide an output signal; and an arithmetic operation circuit foor arithmetically combining the output signal of said signal processing circuit and said input signal to said differential circuit. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A non-linear signal processing apparatus comprising:
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a non-linear signal processing network including a differential circuit for generating an output signal by extracting a variation in a predetermined time period from an input signal thereto, a non-linear circuit for receiving another input signal and for generating in response thereto an output signal having an amplitude that is non-linearly compressed in accordance with the amplitude of the input signal to the non-linear circuit, a delay circuit for generating an output signal by delaying the output signal of said non-linear circuit by a predetermined time period, an adder circuit for combining the output signal of said delay circuit and the output signal of said differential circuit and supplying the combined signal to said non-linear circuit as the input signal received by the non-linear circuit, and a multiplier circuit for multiplying the output signal of said non-linear circuit by a predetermined factor to provide an output signal of said non-linear signal processing network, wherein said non-linear circuit has a multiplication factor that is non-linear, said output signal of said non-linear circuit being not only outputted through said multiplier circuit to exhibit a first compression effect, but also being fed back through said delay circuit to increase a second compression effect; and an arithmetic operation circuit for arithmetically combining the output signal of said non-linear signal processing network and said input signal to said differential circuit. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. An apparatus for non-linearly processing an apparatus input signal, comprising:
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first signal processing means for processing the apparatus input signal in a predetermined manner to provide a first intermediate signal; a non-linear signal processing network which includes differential circuit means, responsive to the first intermediate signal, for delaying the first intermediate signal and for generating a second intermediate signal which corresponds to the difference between the first intermediate signal and the delayed first intermediate signal, an adder having a pair of input ports and having an output port, one of the input ports of the adder receiving the second intermediate signal, non-linear circuit means, having an input port that is connected to the output port of the adder to receive an output signal from the adder, for generating a third intermediate signal that is a non-linear function of the output signal from the adder, delay circuit means for feeding back the third intermediate signal to the other input port of the adder after a predetermined delay, and multiplier circuit means for multiplying the third intermediate signal by a predetermined factor to provide a fourth intermediate signal; second signal processing means for processing the fourth intermediate signal in a predetermined manner to provide a fifth intermediate signal; and arithmetic operation circuit means for arithmetically combining the apparatus input signal and the fifth intermediate signal.
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Specification