FR2293223A1 - Low distortion speech transmission - by adding small amplitude alternating signal to microphone signal before squaring - Google Patents

Low distortion speech transmission - by adding small amplitude alternating signal to microphone signal before squaring

Info

Publication number
FR2293223A1
FR2293223A1 FR7439676A FR7439676A FR2293223A1 FR 2293223 A1 FR2293223 A1 FR 2293223A1 FR 7439676 A FR7439676 A FR 7439676A FR 7439676 A FR7439676 A FR 7439676A FR 2293223 A1 FR2293223 A1 FR 2293223A1
Authority
FR
France
Prior art keywords
signal
small amplitude
microphone signal
low distortion
adding small
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.)
Granted
Application number
FR7439676A
Other languages
French (fr)
Other versions
FR2293223B1 (en
Inventor
Pierre Bouvier
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.)
ROMER WINGARD AUTOGURTE GmbH
Original Assignee
ROMER WINGARD AUTOGURTE GmbH
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 ROMER WINGARD AUTOGURTE GmbH filed Critical ROMER WINGARD AUTOGURTE GmbH
Priority to FR7439676A priority Critical patent/FR2293223A1/en
Publication of FR2293223A1 publication Critical patent/FR2293223A1/en
Application granted granted Critical
Publication of FR2293223B1 publication Critical patent/FR2293223B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B14/00—Transmission systems not characterised by the medium used for transmission
    • H04B14/002—Transmission systems not characterised by the medium used for transmission characterised by the use of a carrier modulation
    • H04B14/004—Amplitude modulation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

The system uses a rectangular signal produced by lopping the peaks off a microphone signal. Before doing so, an auxiliary alternating signal of relatively small amplitude is added to it. A Schmitt bridge can be used to transform the composite signal into a rectangular one, and the degree of lopping achieved by the bridge can be less in absolute value than the minimum amplitude of the microphone signal to be transmitted. The amplitude of the auxiliary signal can be between the lopping level and the minimum microphone signal amplitude. The auxiliary signal can be at inaudible frequency.
FR7439676A 1974-12-04 1974-12-04 Low distortion speech transmission - by adding small amplitude alternating signal to microphone signal before squaring Granted FR2293223A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7439676A FR2293223A1 (en) 1974-12-04 1974-12-04 Low distortion speech transmission - by adding small amplitude alternating signal to microphone signal before squaring

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7439676A FR2293223A1 (en) 1974-12-04 1974-12-04 Low distortion speech transmission - by adding small amplitude alternating signal to microphone signal before squaring

Publications (2)

Publication Number Publication Date
FR2293223A1 true FR2293223A1 (en) 1976-07-02
FR2293223B1 FR2293223B1 (en) 1979-04-06

Family

ID=9145540

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7439676A Granted FR2293223A1 (en) 1974-12-04 1974-12-04 Low distortion speech transmission - by adding small amplitude alternating signal to microphone signal before squaring

Country Status (1)

Country Link
FR (1) FR2293223A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2581276A1 (en) * 1985-04-25 1986-10-31 Velec Sa Method of transporting two signals each consisting of a carrier wave and device for transporting two signals for implementing the method.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2581276A1 (en) * 1985-04-25 1986-10-31 Velec Sa Method of transporting two signals each consisting of a carrier wave and device for transporting two signals for implementing the method.

Also Published As

Publication number Publication date
FR2293223B1 (en) 1979-04-06

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Legal Events

Date Code Title Description
ST Notification of lapse