Information transmitting apparatus and method, information receiving apparatus and method, information transmitting and receiving system and method, recording medium and program

Abstract

An original blanking period of a video signal is shortened to a set blanking period, and audio data is multiplexed into a resulting superimposing period. Table distinguishing data indicating the length of the superimposing period is inserted into the period as a blanking signal. With this configuration, it is possible to enable transmission and reception of an audio signal in a system capable of transmitting and receiving a video signal.

The invention claimed is: 
     
       1. A data transmission apparatus comprising
 a processor to implement:
 a first input unit for inputting video data of a predetermined number of bits; 
 a second input unit for inputting audio data; 
 a setting unit for setting, within a blanking period of the video data, a setup period that is shorter than the blanking period; 
 a multiplexing unit for multiplexing the audio data into a superimposing period, the superimposing period occurring within the blanking period and not including the setup period, and the setup period at least preceding the superimposing period; 
 a video data transmitting unit for encoding the video data to generate encoded video data having a number of bits greater than the predetermined number of bits and transmitting the encoded video data to a data channel; and 
 a retaining unit for retaining information on the setup period or the superimposing period, wherein the retaining unit retains a correspondence between a type of the video data and the setup period or superimposing period as the information on the setup period or superimposing period, and wherein the multiplexing unit multiplexes the audio data into the superimposing period on the basis of the information retained by the retaining unit, 
   the setup period being used to convey predetermined data other than video data or audio data; and   the predetermined data comprising information for identifying the encoded video data and the superimposing period.   
     
     
       2. A data transmission apparatus as claimed in  claim 1 , wherein the setting unit sets the setup period by disposing a blanking signal representing the blanking period only during the setup period and not during the superimposing period. 
     
     
       3. A data transmission apparatus as claimed in  claim 2 , wherein the blanking signal forms a control signal. 
     
     
       4. A data transmission apparatus as claimed in  claim 1 , further comprising a distinguishing information transmitter for transmitting distinguishing information for distinguishing the setup period or the superimposing period. 
     
     
       5. A data transmission apparatus as claimed in  claim 4 , wherein the distinguishing information transmitter transmits the distinguishing information in the setup period of the video data as a type of blanking signal representing a blanking period. 
     
     
       6. A data transmission apparatus as claimed in  claim 5 , wherein the distinguishing information transmitter transmits the distinguishing information in a vertical blanking period. 
     
     
       7. A data transmission apparatus as claimed in  claim 4 , wherein the distinguishing information transmitter transmits the distinguishing information via a transmission line different from a transmission line of the encoded video data. 
     
     
       8. A data transmission apparatus as claimed in  claim 4 , wherein the distinguishing information is information allowing determination of a period from a start point to an end point of the setup period or a period from a start point to an end point of the superimposing period. 
     
     
       9. A data transmission apparatus as claimed in  claim 1 , further comprising a compressing unit for compressing the audio data. 
     
     
       10. A data transmission apparatus as claimed in  claim 1 , further comprising an encrypting unit for encrypting the audio data by a method common with the video data. 
     
     
       11. An information receiving apparatus comprising
 a processor to implement:
 a receiver for receiving a transmitted signal; 
 a first capturing unit for capturing video data from the received signal; 
 a detecting unit for detecting a blanking period of the captured video data, the blanking period being set to a duration different from the duration of an original blanking period of the video data; 
 a second capturing unit for capturing information on a superimposing period of the received signal in which audio data is multiplexed, the superimposing period occurring within the original blanking period and not including the blanking period of the captured video data, and the blanking period of the captured video data at least preceding the superimposing period; 
 a third capturing unit for capturing the audio data from the received signal on the basis of the captured information and superimposing period; 
 a correcting unit for correcting the detected blanking period on the basis of the captured information on the superimposing period; and 
 a retaining unit for retaining the information on the superimposing period, wherein the retaining unit retains a correspondence between a type of the video data and the superimposing period as the information on the superimposing period, and wherein the second capturing unit captures the information on the superimposing period from the information retained by the retaining unit, 
 data indicative of the duration of the superimposing period being received during the blanking period of the captured video data. 
   
     
     
       12. An information receiving apparatus as claimed in  claim 11 , further comprising a converting unit for converting the audio data captured by the third capturing unit into a continuous signal. 
     
     
       13. An information receiving apparatus as claimed in  claim 11 , wherein a blanking signal representing the blanking period of the captured video data forms a control signal. 
     
     
       14. An information receiving apparatus as claimed in  claim 11 , further comprising a distinguishing information extracting unit for extracting distinguishing information for distinguishing the superimposing period. 
     
     
       15. An information receiving apparatus as claimed in  claim 14 , wherein the distinguishing information extracting unit extracts the distinguishing information from a blanking signal representing the blanking period of the captured video data, the blanking signal being inserted in the blanking period of the captured video data. 
     
     
       16. An information receiving apparatus as claimed in  claim 15 , wherein the distinguishing information extracting unit extracts the distinguishing information from the blanking signal in a vertical blanking period. 
     
     
       17. An information receiving apparatus as claimed in  claim 14 , wherein the distinguishing information extracting unit extracts the distinguishing information from a signal received via a transmission line different from a transmission line of the captured video data. 
     
     
       18. An information receiving apparatus as claimed in  claim 14 , wherein the distinguishing information is information allowing determination of a period from a start point to an end point of the superimposing period or a period from a start point to an end point of the blanking period of the captured video data. 
     
     
       19. An information receiving apparatus as claimed in  claim 11 , wherein the audio data is compressed audio data, and
 further comprising an expanding unit for expanding the compressed audio data.   
     
     
       20. An information receiving apparatus as claimed in  claim 11 , further comprising a decrypting unit for decrypting the audio data by a method common with the video data, the audio data being encrypted by a method common with the video data. 
     
     
       21. An information processing apparatus, comprising:
 a first capturing unit for capturing a video signal;   a second capturing unit capturing a compressed audio signal;   a transmitter that
 sets a blanking period of said video signal to a first period of a length different from an original period; 
 multiplexes said compressed audio signal into a second period corresponding to a difference between the blanking period and the first period; 
 transmits said video signal having the compressed audio signal multiplexed therein, in which data indicative of duration of the second period is transmitted during a blanking period of the video signal; and 
   a communication unit that performs processing for communication via a network.   
     
     
       22. The information processing apparatus according to claim 21, wherein the transmitter sets the first period by disposing, only in the first period, a blanking signal. 
     
     
       23. The information processing apparatus according to claim 21, wherein the transmitter transmits the video signal via transition minimized differential signaling (TMDS). 
     
     
       24. An information processing method, comprising:
 capturing a video signal;   capturing a compressed audio signal;   setting a blanking period of said video signal to a first period of a length different from an original period;   multiplexing said compressed audio signal into a second period corresponding to a difference between the blanking period and the first period;   performing processing for communication via a network; and   transmitting said video signal having the compressed audio signal multiplexed therein,   in which data indicative of duration of the second period is transmitted during a blanking period of the video signal.   
     
     
       25. The information processing method according to claim 24, wherein the step of setting the first period comprises disposing, only in the first period, a blanking signal. 
     
     
       26. The information processing method according to claim 24, wherein the step of transmitting comprises transmitting the video signal via transition minimized differential signaling (TMDS). 
     
     
       27. A processor for an apparatus comprising a display and a speaker, the processor comprising:
 a processing device and a memory configured to store instructions which, when executed by the processing device, control the apparatus to:
 perform processing for communication via a network; 
 capture a video signal; 
 capture a compressed audio signal; 
 set a blanking period of said video signal to a first period of a length different from an original period; 
 multiplex said compressed audio signal into a second period corresponding to a difference between the blanking period and the first period; and 
 transmit said video signal having the compressed audio signal multiplexed therein, 
   in which data indicative of duration of the second period is transmitted during a blanking period of the video signal.   
     
     
       28. The processor according to claim 27, wherein the first period is set by disposing, only in the first period, a blanking signal. 
     
     
       29. The processor according to claim 27, wherein the video signal is transmitted via transition minimized differential signaling (TMDS). 
     
     
       30. An information processing apparatus comprising a display, a speaker and a processor, wherein, the processor controls the apparatus to:
 perform processing for communication via a network;   capture a video signal;   capture a compressed audio signal;   set a blanking period of said video signal to a first period of a length different from an original period;   multiplex said compressed audio signal into a second period corresponding to a difference between the blanking period and the first period; and   transmit said video signal having the compressed audio signal multiplexed therein,   in which data indicative of duration of the second period is transmitted during a blanking period of the video signal.   
     
     
       31. The information processing apparatus according to claim 30, wherein setting the first period comprises disposing, only in the first period, a blanking signal. 
     
     
       32. The information processing apparatus according to claim 30, wherein the video signal is transmitted via transition minimized differential signaling (TMDS). 
     
     
       33. The information processing apparatus according to any one of claim 21, 27 and 30, wherein audio data of the compressed audio signal is compressed on the time axis. 
     
     
       34. The information processing apparatus according to claim 33, further comprising:
 an encoding unit that encodes video data of the video signal and the audio data into 10 bits.   
     
     
       35. The information processing apparatus according to claim 34, further comprising:
 an encrypting circuit that encrypts the video data and the audio data.   
     
     
       36. The information processing apparatus according to claim 34, further comprising:
 a buffer that stores the audio data.   
     
     
       37. An information processing apparatus, comprising:
 a display; and   a receiver that
 receives a transmitted signal; 
 captures a video signal from the received signal; 
 detects a blanking period of said captured video signal, said blanking period being set to a length different from an original period; 
 captures information on a multiplexing period in which a compressed audio signal is multiplexed; 
 captures said multiplexed compressed audio signal from said captured video signal on the basis of said captured information on said multiplexing period; 
 corrects said detected blanking period on the basis of said captured information on said multiplexing period, in which data indicative of duration of the multiplexing period is received during a blanking period of the video signal; and 
 outputs the video signal to the display. 
   
     
     
       38. The information processing apparatus according to claim 37, wherein the receiver receives the transmitted signal via transition minimized differential signaling (TMDS). 
     
     
       39. An information processing method, comprising:
 receiving a transmitted signal;   capturing a video signal from the received signal;   detecting in a blanking period of said captured video signal, said blanking period being set to a length different from an original period;   capturing information on a multiplexing period in which a compressed audio signal is multiplexed;   capturing said multiplexed compressed audio signal from said captured video signal on the basis of said captured information on said multiplexing period;   correcting said detected blanking period on the basis of said captured information on said multiplexing period, in which data indicative of duration of the multiplexing period is received during a blanking period of the video signal; and   outputting the video signal to a display.   
     
     
       40. The information processing method according to claim 39, wherein the step of receiving comprises receiving the transmitted signal via transition minimized differential signaling (TMDS). 
     
     
       41. A processor for an apparatus comprising a display, the processor comprising:
 a processing device and a memory configured to store instructions which, when executed by the processing device, control the apparatus to:
 receive a transmitted signal; 
 capture a video signal from the received signal; 
 detect a blanking period of said captured video signal, said blanking period being set to a length different from an original period; 
 capture information on a multiplexing period in which a compressed audio signal is multiplexed; 
 capture said multiplexed compressed audio signal from said captured video signal on the basis of said captured information on said multiplexing period; 
 correct said detected blanking period on the basis of said captured information on said multiplexing period, in which data indicative of duration of the multiplexing period is received during a blanking period of the video signal; and 
 output the video signal to the display. 
   
     
     
       42. The processor according to claim 41, wherein the transmitted signal is transmitted via transition minimized differential signaling (TMDS). 
     
     
       43. An information processing apparatus comprising a display and a processor, wherein, the processor controls the apparatus to:
 receive a transmitted signal;   capture a video signal from the received signal;   detect a blanking period of said captured video signal, said blanking period being set to a length different from an original period;   capture information on a multiplexing period in which a compressed audio signal is multiplexed;   capture said multiplexed compressed audio signal from said captured video signal on the basis of said captured information on said multiplexing period;   correct said detected blanking period on the basis of said captured information on said multiplexing period, in which data indicative of duration of the multiplexing period is received during a blanking period of the video signal; and   output the video signal to the display.   
     
     
       44. The information processing apparatus according to claim 43, wherein the transmitted signal is transmitted via transition minimized differential signaling (TMDS). 
     
     
       45. The information processing apparatus according to any one of claim 37, 41, and 43, wherein audio data of the compressed audio signal is compressed on the time axis. 
     
     
       46. The information processing apparatus according to claim 45, further comprising:
 an encoding unit that encodes video data of the video signal and the audio data into 10 bits.   
     
     
       47. The information processing apparatus according to claim 46, further comprising:
 an encrypting circuit that encrypts the video data and the audio data.   
     
     
       48. The information processing apparatus according to claim 46, further comprising:
 a buffer that stores the audio data.