JPS5713833A - Analog-to-digital converter for pcm circuit - Google Patents

Analog-to-digital converter for pcm circuit

Info

Publication number
JPS5713833A
JPS5713833A JP8809480A JP8809480A JPS5713833A JP S5713833 A JPS5713833 A JP S5713833A JP 8809480 A JP8809480 A JP 8809480A JP 8809480 A JP8809480 A JP 8809480A JP S5713833 A JPS5713833 A JP S5713833A
Authority
JP
Japan
Prior art keywords
attenuator
attenuation
extent
encoder
level
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
JP8809480A
Other languages
Japanese (ja)
Inventor
Norio Ueno
Seiji Kato
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP8809480A priority Critical patent/JPS5713833A/en
Publication of JPS5713833A publication Critical patent/JPS5713833A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
    • H04B1/64—Volume compression or expansion arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Analogue/Digital Conversion (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

PURPOSE:To set the extent of attenuation easily by setting a test mode and applying a test tone, and by setting the extent of attenuation of a variable attenuator automatically and performing encoding. CONSTITUTION:In a test mode, a changeover switch SW is changed over to a power source side of a constant voltage E., and the maximum extent of attenuation of a variable attenuator 1 is set. When a test tone with a constant level is applied to the input of this attenuator 1, this tone is applied to an encoder 3 via the attenuator 1 and a BPF2 and the encoder 3 outputs a digital code corresponding to the input level. Corresponding to the output, a digital value equivalent to the extent of attenuation to be set to the attenuator 1 is read out from an ROM6 and stored in a memory 7. When the test mode is reset, the attenuator 1 operates by being controlled according to the contents of the memory 7, and the encoder 3 therefore generates a signal which corresponds to an output with a standard level in response to an input with a prescribed level.
JP8809480A 1980-06-28 1980-06-28 Analog-to-digital converter for pcm circuit Pending JPS5713833A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8809480A JPS5713833A (en) 1980-06-28 1980-06-28 Analog-to-digital converter for pcm circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8809480A JPS5713833A (en) 1980-06-28 1980-06-28 Analog-to-digital converter for pcm circuit

Publications (1)

Publication Number Publication Date
JPS5713833A true JPS5713833A (en) 1982-01-23

Family

ID=13933275

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8809480A Pending JPS5713833A (en) 1980-06-28 1980-06-28 Analog-to-digital converter for pcm circuit

Country Status (1)

Country Link
JP (1) JPS5713833A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60141022A (en) * 1983-12-28 1985-07-26 Nec Corp Coder and decoder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60141022A (en) * 1983-12-28 1985-07-26 Nec Corp Coder and decoder

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