Transmission system

• US 20050047447A1
• Filed: 08/24/2004
• Published: 03/03/2005
• Est. Priority Date: 08/27/2003
• Status: Active Grant

• Current Assignee: JVC Kenwood Corporation
• Original Assignee: Victor Company of Japan Limited (JVC Kenwood Corporation)
• Inventors: Satoh, Yasuo, Yugami, Masafumi
• Granted Patent: US 7,567,588 B2
• Time in Patent Office: Days
• US Class Current: 370/535
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04

Abstract

A transmission system omits blanking signals from vertical and horizontal synchronizing signals for video data while securing synchronized transmission between a transmission side and a reception side. To achieve this, the transmission system transmits first synchronizing data (HV) for identifying vertical synchronization, second synchronizing data (HDp) for identifying and synchronizing an effective video line, pixel data for the effective video line, a required digital audio signal, and auxiliary control data. The transmission system can reduce a transmission capacity, optimize a transmission format for optical wireless transmission, and decrease a transmission speed.

Claims

1. A transmission system for multiplexing and serially transmitting an uncompressed baseband digital video signal, a digital audio signal, and a digital auxiliary signal representative of auxiliary information such as a video format and an audio format, comprising:

a first storing means for storing pixel data for the digital video signal in predetermined units;

a second storing means for storing the digital audio signal in predetermined audio sample units in response to a sampling frequency synchronized with a transmission master clock oscillator and managing the stored digital audio signal in predetermined units;

a third storing means for storing the digital auxiliary signal;

a transmission signal generating means for multiplexing first synchronizing data defined for a vertical synchronizing signal for the digital video signal, second synchronizing data defined for effective line identification for the digital video signal, the digital video signal read from the first storing means, the digital audio signal read from the second storing means, and the digital auxiliary signal read from the third storing means in predetermined order in time series into a transmission signal representative of a plurality of lines; and

an output means for serially transmitting the transmission signal provided by the transmission signal generating means,

the transmission signal generating means forming the first of the lines the transmission signal represents by reading the first synchronizing data, reading a predetermined number of bits of the digital auxiliary signal from the third storing means, and multiplexing the read data pieces in time series, forming the second of the lines the transmission signal represents by reading the second synchronizing data, reading a predetermined number of bits of the digital auxiliary signal from the third storing means, and multiplexing the read data pieces in time series, and forming each of the third to a predetermined ordinal number of the lines the transmission signal represents by reading the second synchronizing data, sequentially reading, from the digital audio signal stored in the second storing means, a data segment of L (L is a natural number) that is obtained by dividing a sampled data quantity of M bytes (M is a natural number) of the digital audio signal to be transmitted per field by the number N (N is a natural number) of effective lines covered by the digital video signal, sequentially reading effective pixel data for the line in question from the digital video signal stored in the first storing means, and multiplexing the read data pieces in time series, thereby forming the transmission signal having no blanking signals.

2. The transmission system of claim 1, wherein:

the digital video signal is a video signal to be displayed according to a progressive scanning system; and

the digital audio signal multiplexed in the third to the predetermined ordinal number of the lines the transmission signal represents is sequentially transmitted in the data segments L, each data segment L being derived by halving the sampled data quantity including error correction codes of the digital audio signal to be transmitted per field and by dividing each resultant half by a half of the number of the effective lines.

3. The transmission system of claim 1, wherein:

the digital video signal is displayed according to an interlace scanning system; and

the digital audio signal multiplexed in the third to the predetermined ordinal number of the lines the transmission signal represents is transmitted by halving the sampled data quantity including error correction codes of the digital audio signal to be transmitted per field, by dividing each resultant half by a half of the number of effective lines to provide a first-half audio data segment and a second-half audio data segment, and by multiplexing the first- and second-half audio data segments line by line.

4. The transmission system of claim 1, wherein:

the transmission signal generating means forms the first of the lines the transmission signal represents by reading the first synchronizing data, adding special data to identify an even or odd field, reading the digital auxiliary signal, and multiplexing the read and added data pieces in time series, and forms each of the second and following lines the transmission signal represents by reading the second synchronizing data, adding third auxiliary synchronizing data which is special data, reading the digital auxiliary signal or the digital audio signal and digital video signal, and multiplexing the read and added data pieces in time series.

5. The transmission system of claim 1, wherein:

the transmission signal generating means pads a data shortage with null data to keep a balance between the sampled data quantity of the digital audio signal to be transmitted per field and the quantity of effective pixel data read for the effective lines covered by the digital video signal.

6. The transmission system of claim 1, wherein:

the transmission signal generating means generates the transmission signal according to a master clock frequency that is calculated from an integer multiple of the sampling frequency of the digital audio signal and the greatest common devisor that satisfies the number of the effective lines covered by the digital video signal.

7. The transmission system of claim 1, wherein:

the output means carries out 8-bit/10-bit parallel conversion and then parallel/serial conversion on the transmission signal provided by the transmission signal generating means and serially transmits the converted transmission signal.