GB1315749A - Demodulator for binary coded words - Google Patents

Demodulator for binary coded words

Info

Publication number
GB1315749A
GB1315749A GB2356071*A GB2356071A GB1315749A GB 1315749 A GB1315749 A GB 1315749A GB 2356071 A GB2356071 A GB 2356071A GB 1315749 A GB1315749 A GB 1315749A
Authority
GB
United Kingdom
Prior art keywords
bits
decoder
switches
output
store
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.)
Expired
Application number
GB2356071*A
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.)
Krone KG
Original Assignee
Krone KG
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 Krone KG filed Critical Krone KG
Publication of GB1315749A publication Critical patent/GB1315749A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B14/00Transmission systems not characterised by the medium used for transmission
    • H04B14/02Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation
    • H04B14/04Transmission systems not characterised by the medium used for transmission characterised by the use of pulse modulation using pulse code modulation
    • H04B14/046Systems or methods for reducing noise or bandwidth
    • H04B14/048Non linear compression or expansion
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00Analogue/digital conversion; Digital/analogue conversion
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03MCODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00Analogue/digital conversion; Digital/analogue conversion
    • H03M1/06Continuously compensating for, or preventing, undesired influence of physical parameters
    • H03M1/0617Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

1315749 Digital to analogue converters KRONE KG 19 April 1971 [9 March 1970] 23560/71 Heading G4H A circuit for decoding binary coded words in a P.C.M. system comprises a store 100 for receiving the incoming words, a first decoder D1 connected to the store and adapted to receive m most significant bits and n least significant bits of each word, a second decoder D2 adapted to receive the m bits from the store and weighted resistors KD1-RD7 connected to switches S1-S7 actuated by the output of the second decoder. The most significant bit of each word is a polarity bit which controls a switch BS 6 of the decoder D1, shown in detail in Fig. 4a, to supply a positive or negative reference voltage to a parallel arrangement of binary weighted resistors RB1-RB6. The resistors RB1-RB4 are connected in circuit by switches BS1-BS4 actuated by the n bits to select the particular one of the sixteen subdivisions (for n=4) of the amplitude band determined by the m bits. To remove the ambiguity due to the first two bands of the expansion characteristic having the same slope, the m bits are fed to an OR gate 111 which actuates a switch BS5 if any of these bits has a logical value "1". The output voltage from the parallel resistor network is fed via an inverting amplifier V to a potentiometer formed by the weighted resistors RD1-RD7. The decoder D2 comprises seven NAND gates which control the switches S1-S7 to multiply the output U A <SP>1</SP> of the decoder D1 by a factor which determines the amplitude band of the analogue output signal. The switches may be field effect transistors. In a modification the output from the resistor network RB1-RB6 is fed through a second inverting amplifier when the polarity bit changes over ganged switches connected to the outputs of the amplifiers. A ladder network replaces the network RB1-RB6 in a further modification.
GB2356071*A 1970-03-09 1971-04-19 Demodulator for binary coded words Expired GB1315749A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702011056 DE2011056B2 (en) 1970-03-09 1970-03-09 PULSE CODE DEMODULATOR WITH EXTENSION CHARACTERISTICS KINKING CHARACTERISTICS

Publications (1)

Publication Number Publication Date
GB1315749A true GB1315749A (en) 1973-05-02

Family

ID=5764545

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2356071*A Expired GB1315749A (en) 1970-03-09 1971-04-19 Demodulator for binary coded words

Country Status (6)

Country Link
US (1) US3705359A (en)
BE (1) BE763859A (en)
DE (1) DE2011056B2 (en)
FR (1) FR2083956A5 (en)
GB (1) GB1315749A (en)
NL (1) NL7102345A (en)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2221873A1 (en) * 1972-11-24 1974-10-11 Cit Alcatel PCM parallel decoder for telephone systems - has equal resistor chain and binary resistor chain feeding sep. multiplexers
FR2225881B1 (en) * 1973-04-16 1976-04-23 Lannionnais Electronique
IT998230B (en) * 1973-07-12 1976-01-20 Sits Soc It Telecom Siemens CODECODER FOR TIME DIVISION TELEPHONE SYSTEMS
SE386790B (en) * 1975-09-26 1976-08-16 Ellemtel Utvecklings Ab DIGITAL ANALOG CONVERTER
US4160244A (en) * 1976-02-25 1979-07-03 National Semiconductor Corporation Conversion circuit
JPS5347259A (en) * 1976-10-12 1978-04-27 Hitachi Ltd Non-linear load circuit
NL7707475A (en) * 1977-07-06 1979-01-09 Philips Nv TRANSFER SCHEME.
US4513278A (en) * 1977-09-26 1985-04-23 Burroughs Corporation Video Synthesizer for a digital video display system employing a plurality of grayscale levels displayed in discrete steps of luminance
US4363024A (en) * 1977-11-21 1982-12-07 Brokaw Adrian P Digital-to-analog converter providing multiplicative and linear functions
US4532495A (en) * 1978-02-24 1985-07-30 Votrax, Inc. Speech digitization system
FR2463392A1 (en) * 1979-08-07 1981-02-20 Thomson Csf CARTOGRAPHIC INDICATOR DEVICE, MORE PARTICULARLY FOR AN ELECTRONIC AIR NAVIGATION INDICATOR SYSTEM
JPS5938770B2 (en) * 1979-09-10 1984-09-19 株式会社日立製作所 PCM decoder
US4484178A (en) * 1982-06-22 1984-11-20 International Business Machines Corporation Digital-to-analog converter
JPS59163912A (en) * 1983-03-08 1984-09-17 Toshiba Corp C-r type da converter
JPS59193621A (en) * 1983-04-18 1984-11-02 Toshiba Corp Digital-analog converting circuit
BE897773A (en) * 1983-09-19 1984-03-19 Bell Telephone Mfg Cy PULSE CODE MODULATION CONVERTER
US5021785A (en) * 1984-10-04 1991-06-04 Yamaha Corporation Floating point digital to analog converter with bias to establish range midpoint
JPH0712150B2 (en) * 1985-04-19 1995-02-08 ヤマハ株式会社 Digital-to-analog converter
FR2583941B1 (en) * 1985-06-21 1990-04-27 Labo Electronique Physique DIGITAL-TO-ANALOG CONVERSION CIRCUIT PROVIDED WITH NON-LINEAR RESPONSE AND CATHODE-SCANNING DISPLAY DEVICE PROVIDED WITH SUCH A CIRCUIT
GB9024515D0 (en) * 1990-11-12 1991-01-02 Texas Instruments Ltd Improvements in or relating to digital communications
US5404143A (en) * 1991-06-12 1995-04-04 Intellectual Property Development Associates Of Connecticut, Inc. Network swappers and circuits constructed from same
US5296857A (en) * 1992-02-28 1994-03-22 Sgs-Thomson Microelectronics, Inc. Digital to analog converter with precise linear output for both positive and negative digital input values
JP2891274B2 (en) * 1992-10-05 1999-05-17 富士通株式会社 Variable signal attenuator
US6396955B1 (en) * 1998-06-25 2002-05-28 Asahi Kogaku Kogyo Kabushiki Kaisha Image compression and expansion device
DE10237920B3 (en) * 2002-08-14 2004-02-19 Siemens Ag Current measuring method with compression of measured analogue signal before A/D conversion and transmission from high potential measuring point to earth point
JP5799751B2 (en) * 2011-01-31 2015-10-28 ソニー株式会社 Voltage generation circuit, resonance circuit, communication device, communication system, wireless charging system, power supply device, and electronic device

Also Published As

Publication number Publication date
US3705359A (en) 1972-12-05
NL7102345A (en) 1971-09-13
DE2011056B2 (en) 1971-12-16
DE2011056A1 (en) 1971-12-16
BE763859A (en) 1971-08-02
FR2083956A5 (en) 1971-12-17

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Legal Events

Date Code Title Description
429A Application made for amendment of specification (sect. 29/1949)
429C Application to amend the specification withdrawn (sect. 29/1949)
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees