Video signal processing method for digital video decoder
First Claim
1. A video signal processing method which is provided for a digital video decoder for decoding continuous digital composite video signals in order to suppress a fluctuation of a number of sampling data constructing each of said digital composite video signals to be processed by said decoder, said method comprising:
- counting the numbers of sampling data in each of said digital composite video signals to provide respective count values;
comparing the count values of each of said digital composite video signals with a reference number of sampling data of each of said digital composite video signals;
discriminating whether the number of sampling data of said digital composite video signals should be increased or decreased based on a difference obtained as a result of said comparison, and when said difference lies within a predetermined adjusting range, outputting an operation signal for increasing or decreasing the number of sampling data; and
executing a partial adding/deleting process to each of said digital composite video signals to correct the fluctuation of the number of sampling data of each of said digital composite video signals, responsive to the operation signal,wherein said discriminating comprises accumulating a difference between each of said count values and said reference number of sampling data, and outputting said operation signal when a result of said accumulation lies within said predetermined adjusting range, andwherein a predetermined number of digital composite video signals correspond to a scanning field which is specified between said digital composite video signals each having a vertical sync signal, and said predetermined adjusting range is given with respect to said accumulation of the differences with regard to a plurality of digital composite video signals in said scanning field.
2 Assignments
0 Petitions
Accused Products
Abstract
A video signal processing apparatus which is provided for a digital video decoder and can automatically and properly adjust a fluctuation of the number of sampling data of digital composite video signals includes: an adjusting circuit which performs a partial adding/deleting process to the video signals so as to correct the fluctuation in number of sampling data constructing the digital composite video signals supplied to the decoder; and a discriminating circuit which compares the number of sampling data of each video signal and the preset reference number of sampling data and outputs an operation signal for the adding/deleting process to the adjusting circuit when a difference between them as a comparison result lies within a predetermined adjusting range.
-
Citations
16 Claims
-
1. A video signal processing method which is provided for a digital video decoder for decoding continuous digital composite video signals in order to suppress a fluctuation of a number of sampling data constructing each of said digital composite video signals to be processed by said decoder, said method comprising:
-
counting the numbers of sampling data in each of said digital composite video signals to provide respective count values; comparing the count values of each of said digital composite video signals with a reference number of sampling data of each of said digital composite video signals; discriminating whether the number of sampling data of said digital composite video signals should be increased or decreased based on a difference obtained as a result of said comparison, and when said difference lies within a predetermined adjusting range, outputting an operation signal for increasing or decreasing the number of sampling data; and executing a partial adding/deleting process to each of said digital composite video signals to correct the fluctuation of the number of sampling data of each of said digital composite video signals, responsive to the operation signal, wherein said discriminating comprises accumulating a difference between each of said count values and said reference number of sampling data, and outputting said operation signal when a result of said accumulation lies within said predetermined adjusting range, and wherein a predetermined number of digital composite video signals correspond to a scanning field which is specified between said digital composite video signals each having a vertical sync signal, and said predetermined adjusting range is given with respect to said accumulation of the differences with regard to a plurality of digital composite video signals in said scanning field.
-
-
2. A video signal processing method comprising:
-
receiving video signals corresponding to a plurality of scanning lines of a field; counting numbers of pixel data in each of the video signals to provide respective count values of pixel data for each of the video signals; comparing a standard value of pixel data for a video signal respectively with the count values to provide respective difference values for each of the scanning lines; accumulating the difference values to provide an accumulation result; determining whether the accumulation result is within a predetermined adjustment range and providing an operation signal indicative thereof; and executing adding/deleting of pixel data to the scanning lines of the field responsive to the operation signal, wherein each of said video signals is video information of a scanning line unit including a blanking portion, and said executing adding/deleting comprises an increase/decrease of said blanking portion.
-
-
3. A video signal processing method comprising:
-
receiving video signals corresponding to a plurality of scanning lines of a field; counting numbers of pixel data in each of the video signals to provide respective count values of pixel data for each of the video signals; comparing a standard value of pixel data for a video signal respectively with the count values to provide respective difference values for each of the scanning lines; accumulating the difference values to provide an accumulation result; determining whether the accumulation result is within a predetermined adjustment range and providing an operation signal indicative thereof; and executing adding/deleting of pixel data to the scanning lines of the field responsive to the operation signal, the method further comprising storing each of said video signals in a memory having a data insertion/extraction port for performing said executing adding/deleting, and managing said memory by an FIFO system and performing said executing adding/deleting to each of said video signals responsive to said operation signal. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification