JPS57101464A - Simultaneous transmission system for audio and data - Google Patents

Simultaneous transmission system for audio and data

Info

Publication number
JPS57101464A
JPS57101464A JP17851080A JP17851080A JPS57101464A JP S57101464 A JPS57101464 A JP S57101464A JP 17851080 A JP17851080 A JP 17851080A JP 17851080 A JP17851080 A JP 17851080A JP S57101464 A JPS57101464 A JP S57101464A
Authority
JP
Japan
Prior art keywords
circuit
bit
code
block
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP17851080A
Other languages
Japanese (ja)
Inventor
Shinichi Aiko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP17851080A priority Critical patent/JPS57101464A/en
Publication of JPS57101464A publication Critical patent/JPS57101464A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/068—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using time division multiplex techniques

Abstract

PURPOSE:To insert data in bit location, by detecting a redundancy bit in the bit series used for coding in a block, through the monitor of block codes in a modified NIC (quasi-instantaneous companding) system. CONSTITUTION:An audio signal is coded by 8-bit PCM from a terminal 2000 and inputted to a delay circuit 2030 and maximum value detection circuit 2040. The maximum value detection circuit 2040 detects the sample value of the maximum amplitude in a PCM signal and outputs a sample abcwx to a coding circuit 2060, timing circuit 2070, and multiplex circuit 2080 by taking the sample as a block code (apbpcpwpxp). The coding circuit 2060 makes code conversion to a 4-bit NIC code (SB1B2B3) and outputs it to the multiplex circuit 2080. The timing circuit 2070 inputs a block code outputted from the maximum value detection circuit and makes output only when the block code is 0000, and the B1 of the NIC code is replaced to data inputted from a data buffer memory 2050.
JP17851080A 1980-12-17 1980-12-17 Simultaneous transmission system for audio and data Pending JPS57101464A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17851080A JPS57101464A (en) 1980-12-17 1980-12-17 Simultaneous transmission system for audio and data

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17851080A JPS57101464A (en) 1980-12-17 1980-12-17 Simultaneous transmission system for audio and data

Publications (1)

Publication Number Publication Date
JPS57101464A true JPS57101464A (en) 1982-06-24

Family

ID=16049724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17851080A Pending JPS57101464A (en) 1980-12-17 1980-12-17 Simultaneous transmission system for audio and data

Country Status (1)

Country Link
JP (1) JPS57101464A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140957A1 (en) * 1983-04-19 1985-05-15 Compusound Inc Audio digital recording and playback system.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0140957A1 (en) * 1983-04-19 1985-05-15 Compusound Inc Audio digital recording and playback system.

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