Data reception apparatus and data reception method

• US 6,522,704 B1
• Filed: 01/06/2000
• Issued: 02/18/2003
• Est. Priority Date: 01/07/1999
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Hatakeyama, Izumi
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Tran, Khai
• Application Number:
  US09/478,414
• Time in Patent Office: 1,139 Days
• Field of Search: 375/340, 375/130, 375/342, 375/147, 375/324, 375/316, 375/222, 375/341, 370/342, 370/335, 370/320
• US Class Current: 375/340
• CPC Class Codes: H04L 25/0262 Arrangements for detecting the data rate of an incoming signal

Abstract

Data D28 of 384 symbols each (fundamental data) corresponding to a transmission rate on a communication line is sequentially obtained by de-interleaving received data. A de-repetition circuit 212 sequentially outputs four kinds of data D29 to D32 of 384 symbols, 192 symbols, 96 symbols and 48 symbols, including data transfer rates of approximately 9600 bps, approximately 4800 bps, approximately 2400 bps and approximately 1200 bps in response to the data D28 of 384 symbols each. In that case, the data D28 is outputted as the data D29 as it is. At that very moment, a hold circuit 222 and an adder 223 are used to generate data whose data amount is ½ times the data amount from the data D28 as the next outputted data D30, and the data thus generated is written in a memory 213. When data D30, D31 are also outputted, data D31, D32 are respectively generated in the same way. Thus, it is sufficient that the received data of 384 symbols each might be de-interleaved once.

Claims

1. A data reception apparatus for receiving data transmitted such that transmitted data of a data amount corresponding to a transfer rate on a communication line or transmitted data of an arbitrary data amount of a plurality of kinds of data amounts corresponding to ½

N times (N is an integer larger than

     1) is used at every predetermined unit, said transmitted data is directly interleaved and transmitted when said data amount of available transmitted data corresponds to said transfer rate on said communication line and each bit of said transmitted data is repeated 2N−

1 times and said transmitted data is interleaved with a same pattern as that of the aforementioned interleaving when said data amount of said available transmitted data corresponds to said transfer rate ½

N times said transfer rate on said communication line, said data reception apparatus comprising;

de-interleave means for outputting fundamental data of said data amount corresponding to said transfer rate on said communication line by de-interleaving received data at every predetermined unit; and

de-repetition means supplied with said fundamental data of every predetermined unit and for sequentially outputting data corresponding to said plurality of kinds of data amounts by using the fundamental data at every predetermined unit, wherein said de-repetition means outputs said fundamental data at every predetermined unit as it is, generates data of said data amount ½

times the data amount of the fundamental data by using said fundamental data and writes the data generated in a memory, until data of said data amount corresponding to a transfer rate ½

Nmax-1 times (Nmax is the maximum value of N) the transfer rate on said communication line is outputted, said de-repetition means repeats steps of reading out data from said memory, outputting said data read out, generating data of said data amount ½

times said data amount of said read out data and writing said data generated in said memory and said de-repetition means reads out data of said data amount corresponding to the transfer rate ½

Nmax times the transfer rate on said communication line from said memory, and outputs said data read out.

2. The data reception apparatus as claimed in claim 1, wherein said de-repetition means includes a data selector for selecting either said fundamental data outputted from said de-interleave means or the data read out from said memory, data output means for outputting data selected by said data selector as outputted data, data generation means for generating data whose data amount becomes ½

by sequentially adding consecutive 2 bits of the data selected by said data selector, data write means for writing data generated by said generation means in said memory and data read means for reading out data from said memory and supplying the data read out to said data selector.

3. The data reception apparatus as claimed in claim 1, wherein said transmitted data is encoded data and said data reception apparatus further includes decoding means for decoding data whose data amount corresponds to said plurality of kinds of data amounts sequentially outputted from said de-petitition means.

4. The data reception apparatus as claimed in claim 3, wherein said encoded data is data encoded by convolutional codes after a tail bit was added to a transmission object data.

5. The data reception apparatus according to claim 3, further comprising a data selector for selecting either said fundamental data outputted from said de-interleave means or said data read out from said memory, encoding means for encoding again data decoded by said decoding means and comparing means for detecting errors of symbols from said encoded data by comparing said encoded data from said encoding means and data outputted from said data selector and wherein said data selector selects said fundamental data when said fundamental data is supplied to said decoding means and said data selector selects data read out from said memory when said data read out from said memory is supplied to said decoding means.

6. A data reception method for receiving data transmitted wherein transmitted data of a data amount corresponding to a transfer rate on a communication line or said transmitted data of an arbitrary data amount of a plurality of kinds of data amounts corresponding to ½

N times (N is an integer larger than

     1) is used at every predetermined unit, said transmitted data is directly interleaved and transmitted when said data amount of available transmitted data corresponds to said transfer rate on said communication line and each bit of said transmitted data is repeated 2N−

1 times and said transmitted data is interleaved with a same pattern as that of the aforementioned interleaving when said data amount of said available transmitted data corresponds to a transfer rate ½

N times said transfer rate on said communication line, said data reception method comprising;

a first step of outputting fundamental data of said data amount corresponding to a transfer rate on said communication line by de-interleaving received data at every predetermined unit; and

a second step supplied with said fundamental data of every predetermined unit and for sequentially outputting data corresponding to said plurality of kinds of data amounts by using said fundamental data at every predetermined unit, wherein said second step outputs said fundamental data at every predetermined unit as it is, generates data of a data amount ½

times said data amount of said fundamental data by using said fundamental data and writes said data thus generated in a memory, until data of said data amount corresponds to a transfer rate ½

Nmax−

1 times (Nmax is the maximum value of N) said transfer rate on said communication line is outputted, said second step repeats the steps of reading out data from said memory, outputting said data read out, generating data of said data amount ½

times said data amount of said read out data and writing said data generated in said memory and said second step reads out data of said data amount corresponding to a transfer rate ½

Nmax times said transfer rate on said communication line from said memory, and outputs said data read out.