EP0047955A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Wave-shaping circuit
Assignee: Toshiba Corp
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Filing: 1981-09-07
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Granted: —
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Expires: 2001-09-07
Abstract
Abstract A wave-shaping circuit which comprises a comparator (12) for comparing the level of a signal reproduced from a magnetic tape on which, for example, PCM signals are recorded with the level of a reference signal, and a D flip-flop circuit (26) for holding an output signal from the comparator for a prescribed period. Where the reproduced signal has a higher level than the original level of the reference signal, then the reference signal is made to have a higher level than the original level by an output signal from the D flip-flop circuit (26), that is, an output signal from the comparator (12). Where the reproduced signal has a lower level than the original level of a reference signal, then the reference signal is made to have a lower level than the original level by the output signal from the comparator (12). As a result, strains occurring at the high density recording are not reproduced.
Inventors
- 👤 Shigeru Todokoro
- 👤 Tadashi Kojima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 17:33
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/13; H03K5/131; H03K5/01; H03K5/08; H03K5/082; H03K5/084
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A wave-shaping circuit comprising: an input terminal (10) supplied with a coded signal; reference signal generating means (14, 20, 22); means (12) for comparing a signal supplied through the input terminal (10) with the reference signal; and holding means (26) which holds an output signal from the comparing means for a prescribed period and issues the held signal as a wave-shaped signal, characterized in that the reference signal generating means (14, 20, 22) is formed of a variable level signal generating means which issues a reference signal whose level varies with the output signal from said holding means (26).
Claim 2
Dependent Claim
99 words
A wave-shaping circuit comprising: an input terminal (10) supplied with a coded signal; reference signal generating means (14, 20, 22); means (12) for comparing a signal supplied through the input terminal (10) with the reference signal; and holding means (26) which holds an output signal from the comparing means for a prescribed period and issues the held signal as a wave-shaped signal, characterized in that the reference signal generating means (14, 20, 22) is formed of a variable level signal generating means which issues a reference signal whose level varies with the output signal from said holding means (26).
Claim 3
Dependent Claim
62 words
The wave-shaping circuit according to claim 1, wherein said variable level signal generating means comprises first and second power sources; and a switch which is connected to the first and second power sources and selectively connects one or the other of the two power sources to said comparing means in accordance with the contents of an output signal from said holding means.
Claim 4
Dependent Claim
38 words
The wave-shaping circuit according to claim 1, wherein said variable level signal generating means comprises a power source; and a mixer which adds an output signal from said holding means to an output signal from the power source.
Claim 5
Dependent Claim
80 words
The wave-shaping circuit according to claim 2 or 3, wherein said variable level signal generating means sends forth a reference signal having a higher level than the original level, when the input signal has a higher level than the original level of the reference signal; and said variable level signal generating means issues a reference signal having a lower level than the original level, when the input signal has a lower level than the original level of the reference signal.
Claim 6
Dependent Claim
106 words
The wave-shaping circuit according to claim 1, wherein said comparing means comprises first and second comparators; and said variable level signal generating means comprises a first power source connected to the first comparator and a second power source which has a lower voltage level than the voltage level of the first power source and is connected to the second compartor, and a switch which is connected to the first and second comparators and selectively supplies an output signal from one or the other of the first and second comparators to said holding means in accordance with the contents of an output signal from said holding means.
Claim 7
Dependent Claim
77 words
The wave-shaping circuit according to claim 5, wherein said switch is selectively connected to the first comparator, when the output signal from said holding means shows that the input signal has a higher level than the original level of the reference signal; and said switch is selectively connected to the second comparator, when the output signal from said holding means shows that the input signal has a lower level than the original level of the reference signal.
References Cited (Backward Citations)
No citation records indexed.
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