Signal storage system
First Claim
Patent Images
1. A storage system comprising:
- a first analog-to-digital converter which converts an analog signal to-be-stored into an m-bit digital signal;
storage means for respectively storing the analog signal and a signal consisting of the k lower significant bits in the m-bit digital signal delivered from said first analog-to-digital converter;
a second analog-to-digital converter which converts into a digital signal an analog signal reproduced from the analog signal stored in said storage means;
means for correcting the digital signal delivered from said second analog-to-digital converter, on the basis of a digital signal reproduced from the signal consisting of the k lower significant bits of the digital signal as stored in said storage means; and
a digital-to-analog converter which converts into an analog signal the digital signal corrected by said means for correcting.
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Abstract
An analog signal is stored in an analog memory device, while lower bits of a digital signal obtained by digitizing the analog signal is stored in a digital memory device. An analog signal reproduced from the analog memory device is corrected on the basis of a digital signal reproduced from the digital memory device. The corrected reproduced signal is stored in the memory device again, whereby a recursive storage system is constructed. A signal component degraded by noise in the analog storage is corrected with the digital signal, with the result that storage and reproduction of favorable signal-to-noise ratio are realized.
11 Citations
20 Claims
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1. A storage system comprising:
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a first analog-to-digital converter which converts an analog signal to-be-stored into an m-bit digital signal; storage means for respectively storing the analog signal and a signal consisting of the k lower significant bits in the m-bit digital signal delivered from said first analog-to-digital converter; a second analog-to-digital converter which converts into a digital signal an analog signal reproduced from the analog signal stored in said storage means; means for correcting the digital signal delivered from said second analog-to-digital converter, on the basis of a digital signal reproduced from the signal consisting of the k lower significant bits of the digital signal as stored in said storage means; and a digital-to-analog converter which converts into an analog signal the digital signal corrected by said means for correcting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A storage system comprising:
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a first analog-to-digital converter which converts an analog signal to-be-stored into an m-bit digital signal; storage means for respectively storing the analog signal and a signal consisting of the k lower significant bits in the m-bit digital signal delivered from said first analog-to-digital converter; a second analog-to-digital converter which converts into a digital signal an analog signal reproduced from the analog signal stored in said storage means; means for correcting the digital signal delivered from said second analog-to-digital converter, on the basis of a digital signal reproduced from the signal consisting of the k lower significant bits of the digital signal as stored in said storage means; a digital-to-analog converter which converts into an analog signal the digital signal corrected by said means for correcting; a signal channel which feeds the output signal of said digital-to-analog converter back to said storage means in order to store said output signal in said storage means; and a signal channel which feeds the digital signal reproduced from the lower bit signal storage back to said storage means in order to store said digital signal in said storage means again. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification