Data transmission apparatus
First Claim
1. A data transmission apparatus that transmits information data, whose generated information amount varies with passing of time, to a communication channel whose transmission quality varies with passing of time, comprising:
- a separation unit configured to separate the information data into a first information component necessary for real-time reproduction and a second information component other than the first information component;
a first encoding unit configured to encode the separated first information component according to a first encoding scheme corresponding to a first transmission rate that is always secured on the communication channel, thereby outputting first encoded information data;
a second encoding unit configured to accumulate the separated second information component and encode the separated second information component according to a second encoding scheme corresponding to a second transmission rate that is other than the first transmission rate and is irregularly secured on the communication channel, thereby outputting second encoded information data;
a modulation unit configured to produce a modulated signal on the basis of the first encoded information data output from the first encoding unit and the second encoded information data output from the second encoding unit; and
a transmission unit configured to transmit the modulated signal produced by the modulation unit to the communication channel.
1 Assignment
0 Petitions
Accused Products
Abstract
In a transmission-side data transmission apparatus, a first information component of information data, necessary for real-time reproduction, is transmitted at a first transmission rate that is always secured on a communication channel. The other second information component of the information data, which is necessary for lossless reproduction but not for real-time reproduction, is intermittently transmitted at a second transmission rate that is irregularly secured on the communication channel. On the other hand, in a receiving-side data transmission apparatus, first encoded data that has been transmitted at the first transmission rate is decoded and reproduced in real time. Second encoded data that has been intermittently transmitted at the second transmission rate is decoded and synthesized with the real-time information component, whereby reception information data corresponding to the transmission information data is losslessly reproduced.
59 Citations
29 Claims
-
1. A data transmission apparatus that transmits information data, whose generated information amount varies with passing of time, to a communication channel whose transmission quality varies with passing of time, comprising:
-
a separation unit configured to separate the information data into a first information component necessary for real-time reproduction and a second information component other than the first information component;
a first encoding unit configured to encode the separated first information component according to a first encoding scheme corresponding to a first transmission rate that is always secured on the communication channel, thereby outputting first encoded information data;
a second encoding unit configured to accumulate the separated second information component and encode the separated second information component according to a second encoding scheme corresponding to a second transmission rate that is other than the first transmission rate and is irregularly secured on the communication channel, thereby outputting second encoded information data;
a modulation unit configured to produce a modulated signal on the basis of the first encoded information data output from the first encoding unit and the second encoded information data output from the second encoding unit; and
a transmission unit configured to transmit the modulated signal produced by the modulation unit to the communication channel. - View Dependent Claims (2, 3, 4)
-
-
5. A data transmission apparatus comprising:
-
a reception unit configured to receive a modulated signal transmitted over a communication channel whose transmission quality varies with passing of time;
a demodulation unit configured to demodulate the received modulated signal and to output first demodulated data and second demodulated data;
a first decoding unit configured to decode the first demodulated data output from the demodulation unit according to a first decoding scheme corresponding to a first transmission rate that is always secured on the communication channel, thereby outputting first decoded data;
a second decoding unit configured to decode the second demodulated data output from the demodulation unit according to a second decoding scheme corresponding to a second transmission rate that is different from the first transmission rate and is irregularly secured on the communication channel, thereby outputting second decoded data;
a first reproduction unit configured to reproduce first information data in real time on the basis of the first decoded data output from the first decoding unit;
a synthesis unit configured to synthesize the first decoded data output from the first decoding unit and the second decoded data output from the second decoding unit; and
a second reproduction unit configured to reproduce second information data on the basis of the synthesized decoded data. - View Dependent Claims (6, 7, 8)
-
-
9. A data transmission apparatus that transmits first information data, which requires real-time reproduction, and second information data, which requires lossless reproduction, to a communication channel whose transmission quality varies with passing of time, comprising:
-
a first encoding unit configured to encode the first information data according to a first encoding scheme corresponding to a first transmission rate that is always secured on the communication channel, thereby outputting first encoded information data;
a second encoding unit configured to accumulate the second information data and to encode the second information data according to a second encoding scheme corresponding to a second transmission rate that is different from the first transmission rate and is irregularly secured on the communication channel, thereby outputting second encoded information data;
a modulation unit configured to produce a modulated signal on the basis of the first encoded information data output from the first encoding unit and the second encoded information data output from the second encoding unit; and
a transmission unit configured to transmit the modulated signal produced by the modulation unit to the communication channel. - View Dependent Claims (10)
-
-
11. A data transmission apparatus which receives a modulated signal transmitted over a communication channel whose transmission quality varies with passing of time, comprising:
-
a reception unit configured to receive the modulated signal transmitted over the communication channel;
a demodulation unit configured to demodulate the received modulated signal and to output first demodulated data and second demodulated data;
a first decoding unit configured to decode the first demodulated data output from the demodulation unit according to a first decoding scheme corresponding to a first transmission rate that is always secured on the communication channel, thereby outputting first decoded data that requires real-time reproduction; and
a second decoding unit configured to decode the second demodulated data output from the demodulation unit according to a second decoding scheme corresponding to a second transmission rate that is different from the first transmission rate and is irregularly secured on the communication channel, thereby outputting second decoded data that requires lossless reproduction. - View Dependent Claims (12, 13)
-
-
14. A data transmission method comprising:
-
separating, in a first data transmission apparatus, information data, whose generated information amount varies with passing of time, into a first information component necessary for real-time reproduction and a second information component other than the first information component;
encoding the separated first information component according to a first encoding scheme corresponding to a first transmission rate that is always secured on a communication channel whose transmission quality varies with passing of time, thereby outputting first encoded information data;
accumulating the separated second information component and encoding the second information component according to a second encoding scheme corresponding to a second transmission rate that is different from the first transmission rate and is irregularly secured on the communication channel, thereby outputting second encoded information data;
producing a modulated signal on the basis of the first encoded information data and the second encoded information data;
transmitting the produced modulated signal to the communication channel;
receiving, in a second data transmission apparatus, the modulated signal transmitted over the communication channel;
demodulating the received modulated signal and outputting first demodulated data corresponding to the first encoded information data and second demodulated data corresponding to the second encoded information data;
decoding the output first demodulated data according to a first decoding scheme corresponding to the first encoding scheme, thereby outputting first decoded data corresponding to the first information component;
decoding the output second demodulated data according to a second decoding scheme corresponding to the second encoding scheme, thereby outputting second decoded data corresponding to the second information component;
reproducing the first information component in real time on the basis of the output first decoded data;
synthesizing the output first decoded data and the output second decoded data; and
reproducing reception information data corresponding to the transmitted information data on the basis of the synthesized decoded data.
-
-
15. A data transmission method comprising:
-
encoding, in a first data transmission apparatus, first information data, which requires real-time reproduction, according to a first encoding scheme corresponding to a first transmission rate that is always secured on a communication channel whose transmission quality varies with passing of time, thereby outputting first encoded information data;
accumulating second information data which requires lossless reproduction;
encoding the accumulated second information data according to a second encoding scheme corresponding to a second transmission rate that is different from the first transmission rate and is irregularly secured on the communication channel, thereby outputting second encoded information data;
producing a modulated signal on the basis of the output first encoded information data and the output second encoded information data;
transmitting the produced modulated signal to the communication channel;
receiving, in a second data transmission apparatus, the modulated signal transmitted over the communication channel;
demodulating the received modulated signal and outputting first demodulated data corresponding to the first encoded information data and second demodulated data corresponding to the second encoded information data;
decoding the output first demodulated data according to a first decoding scheme corresponding to the first encoding scheme, thereby outputting first decoded data corresponding to the transmitted first information data; and
decoding the output second demodulated data corresponding to the second encoded information data according to a second decoding scheme corresponding to the second encoding scheme, thereby outputting second decoded data corresponding to the transmitted second information data.
-
-
16. A data transmission apparatus, comprising:
-
a data generation unit configured to generate parallel bit data constituted of a first bit block to which first data is allocated and a second bit block to which second data lower is allocated;
a modulation unit configured to map the first bit block of the generated parallel bit data on one of a plurality of first signal points arranged at a first distance between signal points in complex plane, and the second bit block of the generated parallel bit data on one of a plurality of second signal points arranged at a second distance between signal points shorter than the first distance in the complex plane; and
a transmission unit configured to transmit a modulated signal produced by the modulation unit to a receiving device. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. A data transmission apparatus, comprising:
-
a reception unit configured to receive a modulated signal sent from a transmission device;
a demodulation unit configured to demodulate a first bit block mapped on one of a plurality of first signal points arranged at a first distance between signal points in complex plane and a second bit block mapped on one of a plurality of second signal points arranged at a second distance between signal points shorter than the first distance in the complex plane from the received modulated signal; and
a data reproduction unit configured to reproduce first data and second data from the first bit block and the second bit block that have been demodulated. - View Dependent Claims (26, 27, 28, 29)
-
Specification