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EP0473507A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Apparatus for transmitting and receiving an image signal in use of a telephone line

Assignee: LG Electronics Inc
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Filing: 1991-08-27
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Granted: —
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Expires: 2011-08-27
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Abstract

Abstract An apparatus for transmitting and receiving an image signal in use of a telephone line, comprising an image signal processing section including a central processing unit (6) for controlling the whole operation of the apparatus, an A/D converter (2) for converting an image signal outputted from a camera (1) into a digital signal and a memory (3) for storing the digital signal from the A/D convertor and reading out the stored digital data under a control of the central processing unit, an image signal transmitting section for converting the digital data outputted from the image signal processing unit into a sinusoidal wave signal of a predetermined frequency corresponding to the digital data and transmitting the sinusoidal wave signal of the predeteimined frequency to a telephone line interface circuit (12), and an image signal receiving section for counting a frequency of a sinusoidal wave signal received through the telephone line interface circuit, converting the counted. value into an origianl image signal and displaying the image signal on a monitor (19). The present apparatus is capable of transmitting and receiving much information of image data at high speed.

Inventors

  • 👤 Hyeon Jong Choi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 23:17
CPC Classifications
H; H04; H04N; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2383; H04N7/00; H04N7/12; H04N21/40; H04N21/43; H04N21/438; H04N21/4382

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 170 words
An apparatus for transmitting and receiving an image signal in use of a telephone line, comprising : image signal processing means including a central processing unit (6) for controlling the whole operation of the apparatus, an A/D converter (2) for converting an image signal outputted from a camera (1) into a digital signal, and a memory (3) for storing the digital signal from said A/D converter (2) and reading out the stored digital data under control of said central processing unit (6) ; image signal transmitting means for converting the digital data outputted from said image signal processing means into a sinusoidal wave signal of a predetermined frequency corresponding to the digital data and transmitting the sinusoidal wave signal of the predetermined frequency to a telephone line interface circuit (20) ; and image signal receiving means for counting a frequency of a sinusoidal wave signal received through said telephone line interface circuit, converting the counted value into an original image signal and displaying the image signal on a monitor (19).
Claim 2
Dependent Claim 116 words
An apparatus for transmitting and receiving an image signal in use of a telephone line, as set forth in Claim 1, wherein said image signal transmitting means includes ; first oscillating means (9) for generating a predetermined frequency of oscillation signal ; first frequency-dividing means (8) for frequency-dividing said oscillation signal from said first oscillating means ; data/frequency converting means (7) for converting the digital data from said memory into the predetermined frequency of sinusoidal wave signal in response to the frequency-divided signal from said first frequency-dividing means ; and amplifying means (10) for amplifying an output signal from said data/frequency converting means (7) and sending the amplified signal to said telephone line interface circuit (20).
Claim 3
Dependent Claim 86 words
An apparatus for transmitting and receiving an image signal in use of a telephone line, as set forth in Claim 2, wherein said data/frequency converting means (7) includes : second programmable frequency-dividing means (50) for converting the digital data from said memory (3) into a predetermined frequency of square wave signal in response to the frequency-divided signal from said first frequency-dividing means ; and square wave/sinusoidal wave converting means (51) for converting an output signal from said second programmable frequency-dividing means into the sinusoidal wave signal.
Claim 4
Dependent Claim 163 words
An apparatus for transmitting and receiving an image signal in use of a telephone line, as set forth in Claim 1, 2 or 3, wherein said image signal receiving means includes : receiving amplifying means (13) for amplifying the sinusoidal wave signal received through said telephone line interface circuit (12) ; zero-point detecting means (14) for detecting a zero-point of an output signal from said receiving amplifying means to output a square wave signal ; second oscillating means (16) for generating a predetermined frequency of oscillation signal ; frequency counting means for counting a frequency of an output signal from said zero-point detecting means in response to said oscillation signal from said second oscillating means ; frequency/data converting means (17) for converting an output signal from said frequency counting means into original digital data ; and D/A converting means (18) for converting an output signal from said frequency/data converting means into an analog signal and displaying the analog signal on said monitor (19).

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