US 5,627,602 A · Signal processing apparatus for plural kinds of video signals

Abstract

A video signal processing apparatus processes plural kinds of video signals and is used for displaying each one of the processed outputs of the plural kinds of video signals on the same screen. In the video signal processing apparatus, a memory used for a subtitle processing circuit and a memory used for a helper signal separation circuit are used in common by providing a switching means to switch according to an input video signal. A subtitle processing circuit magnifies a video signal with a letter box format such that a horizontally long picture is inserted in a picture with a 4:3 aspect ratio on a horizontally long screen with 2:1 or 16:9 aspect ratio. The helper signal separation circuit is used for receiving a television signal such as an EDTV 2 system which has a helper signal to improve picture quality.

Claims13

Dependent claims

A signal processing apparatus for plural kinds of video signals comprising:

memory means which can read and write;
first video signal processing means for processing a first video signal, which is included in a composite video signal, using said memory means;
first three state bus transceiver means for selecting an input signal and an output signal of said first video signal processing means by a first switching signal;
second video signal processing means for processing a second video signal included in the composite video signal using said memory means;
second three state bus transceiver means for selecting an input signal and an output signal of said second video signal processing means by a second switching signal;
discrimination means for discriminating the first video signal and the second video signal and forming a discrimination result therefrom;
and
control means for receiving the discrimination result and for generating said first switching signal and said second switching signal based on the discrimination result;
wherein said first three state bus transceiver means and said second three state bus transceiver means are connected to said memory means.

6 more elements

A signal processing apparatus for plural kinds of video signals comprising:

memory means for storing an input video signal comprising at least a first video signal and a second video signal;
first video signal processing means for processing the first video signal using said memory means;
first switching means adapted to provide an output signal of said first video signal processing means to said memory means;
second video signal processing means for processing the second video signal using said memory means;
second switching means adapted to provide an output signal of said second video signal processing means to said memory means;
control means for controlling said first switching means and said second switching means, wherein:
said memory is adapted to provide an output signal to said first video signal processing means and said second video signal processing means;
said control means controls turning on and off of said first switching means and said second switching means according to the input video signal;
said first video signal processing means is subtitle processing means for moving a subtitle position;
said second video signal processing means is separation means for separating a helper signal for improving picture quality;
said control means provides a video signal discrimination means for discriminating kind of the input video signal, wherein:
when said video signal discrimination means discriminates that the input video signal includes a discrimination signal to judge if the helper signal for improving picture quality is present or not, the first switching means is made off and the second switching means is made on, and
when said video signal discrimination means discriminates that the input video signal does not include the discrimination signal, said first switching means is made on and said second switching means is made off.

10 more elements

Dependencies are inferred from the claim text.

Signal processing apparatus for plural kinds of video signals

Life of this patent

Signal processing apparatus for plural kinds of video signals

Life of this patent

Abstract

Claims13