JPS5753132A - Transmission system for widening voice band and shortening time - Google Patents

Transmission system for widening voice band and shortening time

Info

Publication number
JPS5753132A
JPS5753132A JP55128097A JP12809780A JPS5753132A JP S5753132 A JPS5753132 A JP S5753132A JP 55128097 A JP55128097 A JP 55128097A JP 12809780 A JP12809780 A JP 12809780A JP S5753132 A JPS5753132 A JP S5753132A
Authority
JP
Japan
Prior art keywords
voice
circuit
signal
data
transmission
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
JP55128097A
Other languages
Japanese (ja)
Inventor
Katsuyoshi Azeyanagi
Hiroshi Yamamoto
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP55128097A priority Critical patent/JPS5753132A/en
Publication of JPS5753132A publication Critical patent/JPS5753132A/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
    • H04M11/064—Data transmission during pauses in telephone conversation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Reduction Or Emphasis Of Bandwidth Of Signals (AREA)

Abstract

PURPOSE:To transmit other signals in an idle time due to time compression of a voice waveform and to transmit plural signals simultaneously in real time without degradation of the quality of voice. CONSTITUTION:The voice output of a four-wire telephone set 21 is supplied to a voice time compressing circuit 31 and is made into a signal of 4k or less Hz by an LPF32 to obtain a voice signal 11. A sampling circuit 33, an encoding circuit 34, a buffer memory 35, a decoding circuit 36, and an LPF37 are used in order for the voice signal 11 to obtain a voice transmission signal 16. Meanwhile, output data 12 from a data terminal 22 is stored temporarily in a buffer memory 39 in a data transmitting circuit 38, and phase information and data 12 are obtained as the output of the buffer memory 39 and have the band limited up to 8k or less Hz by a low- pass filter 41 and are synthesized with the voice transmission signal 16 to obtain a transmission waveform from the terminal, and the transmission waveform is transmitted to a transmission line 24 of subscriber's lines through a hybrid circuit 42.
JP55128097A 1980-09-16 1980-09-16 Transmission system for widening voice band and shortening time Pending JPS5753132A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55128097A JPS5753132A (en) 1980-09-16 1980-09-16 Transmission system for widening voice band and shortening time

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55128097A JPS5753132A (en) 1980-09-16 1980-09-16 Transmission system for widening voice band and shortening time

Publications (1)

Publication Number Publication Date
JPS5753132A true JPS5753132A (en) 1982-03-30

Family

ID=14976314

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55128097A Pending JPS5753132A (en) 1980-09-16 1980-09-16 Transmission system for widening voice band and shortening time

Country Status (1)

Country Link
JP (1) JPS5753132A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60254891A (en) * 1984-05-31 1985-12-16 Fujitsu Ltd Speech and data communication system
JPS6112154A (en) * 1984-06-27 1986-01-20 Nec Corp Terminal equipment control system in telephone exchange
JPS63120535A (en) * 1986-09-26 1988-05-24 サイコム　コーポレーション Accurate multiplexed receiver of analog and digital data through narrow channel
JPH01181344A (en) * 1988-01-14 1989-07-19 Nec Corp Radio communication system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60254891A (en) * 1984-05-31 1985-12-16 Fujitsu Ltd Speech and data communication system
JPS6112154A (en) * 1984-06-27 1986-01-20 Nec Corp Terminal equipment control system in telephone exchange
JPS63120535A (en) * 1986-09-26 1988-05-24 サイコム　コーポレーション Accurate multiplexed receiver of analog and digital data through narrow channel
JPH01181344A (en) * 1988-01-14 1989-07-19 Nec Corp Radio communication system

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