GB1406831A - Controlled delay line signal processor for sound reproduction - Google Patents

Controlled delay line signal processor for sound reproduction

Info

Publication number
GB1406831A
GB1406831A GB3755372A GB3755372A GB1406831A GB 1406831 A GB1406831 A GB 1406831A GB 3755372 A GB3755372 A GB 3755372A GB 3755372 A GB3755372 A GB 3755372A GB 1406831 A GB1406831 A GB 1406831A
Authority
GB
United Kingdom
Prior art keywords
delay
delay line
line
signal
gap filling
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
GB3755372A
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.)
Cambridge Research and Development Group
DT LIQUIDATING PARTNERSHIP
Original Assignee
Cambridge Research and Development Group
DT LIQUIDATING PARTNERSHIP
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 Cambridge Research and Development Group, DT LIQUIDATING PARTNERSHIP filed Critical Cambridge Research and Development Group
Publication of GB1406831A publication Critical patent/GB1406831A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B3/00Line transmission systems
    • H04B3/02Details
    • H04B3/04Control of transmission; Equalising
    • H04B3/10Control of transmission; Equalising by pilot signal
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10LSPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/04Time compression or expansion
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00Head arrangements not specific to the method of recording or reproducing
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K4/00Generating pulses having essentially a finite slope or stepped portions
    • H03K4/06Generating pulses having essentially a finite slope or stepped portions having triangular shape
    • H03K4/08Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
    • H03K4/48Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
    • H03K4/50Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor
    • H03K4/501Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator
    • H03K4/502Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices in which a sawtooth voltage is produced across a capacitor the starting point of the flyback period being determined by the amplitude of the voltage across the capacitor, e.g. by a comparator the capacitor being charged from a constant-current source
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K7/00Modulating pulses with a continuously-variable modulating signal
    • H03K7/08Duration or width modulation ; Duty cycle modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/66Details 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 reducing bandwidth of signals; for improving efficiency of transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/66Details 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 reducing bandwidth of signals; for improving efficiency of transmission
    • H04B1/662Details 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 reducing bandwidth of signals; for improving efficiency of transmission using a time/frequency relationship, e.g. time compression or expansion

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Quality & Reliability (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Computational Linguistics (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Analogue/Digital Conversion (AREA)
  • Signal Processing Not Specific To The Method Of Recording And Reproducing (AREA)

Abstract

1406831 Time compression or expansion systems CAMBRIDGE RESEARCH & DEVELOPMENT GROUP DT LIQUIDATING PARTNERSHIP S D GREENBERG and M M SCHIFFMAN 11 Aug 1972 [13 Aug 1971 7 Feb 1972] 37553/72 Heading H4R Signals from a tape recorder which is playing back a recording at the wrong speed are fed to a delay line which is arranged to provide an an output having a linearly variable delay relative the input so that the signals have their frequency components restored to the original range. Discontinuities between samples after passage through the delay line are eliminated by blanking and gap filling, smoothing, or arranging that the sample ends at a zero crossing and a gap filling signal commences at a zero crossing in the same direction. The variable delay may be provided either by an analogue delay line whose overall delay can be continuously charged, e.g. by having the line comprise R-C sections in series with the R's varied to vary the delay, using an analogue or digital shift register whose shift rate is varied or using an analogue or digital shaft register or memory matrix which is filled at a different rate to its reading rate. As described in Fig. 7, a playback device 51 has its speed controlled by a device 52 which also controls, in 58, the slope of a sawtooth voltage, produced by generator 64, which controls the delay of a delay line 56 through which the output from the recorder 51 passes. Sections of the output from the recorder 51 are therefore expanded or compressed in time at the output of the delay line 56 depending on the polarity of the sawtooth voltage. When the delay of line 56 has been varied from one extreme to the other a discontinuity will be generated during a fast change back to the original delay and during this time the output of the line is blocked by the blanking circuit 71, and a signal can be interposed in the resulting gap by the gap filler 75. Fig. 9 (not shown) shows a system for derivation of the gap filling signal from another variable delay line fed with a similar but phase shifted sawtooth voltage to the first variable delay line. The second line may be of similar length to the first, or, for economy, a short line just producing a signal long enough to extend over the gap. Another alternative, Fig. 12 (not shown), uses a fixed delay line connected to the output of the variable delay line to provide the gap filling signal. To produce a binaural output each channel contains a variable delay line controlled by respective relatively phase shifted sawtooth voltages with gap filling signals for one channel provided by the signal in the other channel and vice versa, Fig. 15 (not shown). A shift register may be used to provide the delay with the delay controlled either by varying the shift rate, Figs. 17, 19, 20 (not shown), or by feeding signals in at a different rate to that at which they are read-out, Fig. 26 (not shown). Alternatively addressable memory matrices may be used of either analogue form, Fig. 21 (not shown), or digital form, Fig. 22 (not shown). In order to reduce discontinuities at the beginning and end of the gap filling signal the blanking signal can be arranged to start at a zero crossing of the variably delayed signal and the gap filling signal to start at a similarly directed zero crossing, with a similar arrangement at the end of the gap filling signal.
GB3755372A 1971-08-13 1972-08-11 Controlled delay line signal processor for sound reproduction Expired GB1406831A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US17157171A 1971-08-13 1971-08-13
US22403572A 1972-02-07 1972-02-07

Publications (1)

Publication Number Publication Date
GB1406831A true GB1406831A (en) 1975-10-01

Family

ID=26867208

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3755372A Expired GB1406831A (en) 1971-08-13 1972-08-11 Controlled delay line signal processor for sound reproduction

Country Status (19)

Country Link
JP (1) JPS551596B2 (en)
AR (1) AR201269A1 (en)
AT (1) AT354126B (en)
BE (1) BE787492A (en)
CA (1) CA965014A (en)
CH (1) CH564815A5 (en)
CS (1) CS195258B2 (en)
DD (1) DD100347A5 (en)
DE (1) DE2238136C2 (en)
ES (1) ES405791A1 (en)
FR (1) FR2150067A5 (en)
GB (1) GB1406831A (en)
IL (1) IL40057A (en)
IT (1) IT962099B (en)
LU (1) LU65886A1 (en)
NL (1) NL172200C (en)
PH (1) PH9570A (en)
PL (1) PL95183B1 (en)
SE (1) SE383934B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2217754A2 (en) * 1971-08-13 1974-09-06 Greenberg Sanford Compander for reproducing speech or sound signals
JPS4868641A (en) * 1971-12-17 1973-09-19
JPS51104309A (en) * 1975-03-11 1976-09-16 Matsushita Electric Ind Co Ltd Pitsuchihenkansochi
FR2491703B1 (en) * 1980-10-03 1988-04-29 Thomson Csf COMPRESSION DEVICE AND TEMPORAL DATA DECOMPRESSION DEVICE AND TRANSMISSION SYSTEM COMPRISING AT LEAST ONE OF SUCH DEVICES

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US320269A (en) * 1885-06-16 Vehicle running-gear
US3093796A (en) * 1959-10-28 1963-06-11 Everett C Westerfield Automatic signal time compressor with gate means for controlling rate of shift register output
US3480737A (en) * 1966-03-08 1969-11-25 Cambridge Res & Dev Group Apparatus for reducing time duration of signal reproduction
GB1213818A (en) * 1967-12-04 1970-11-25 Chicago Musical Instr Co Improvements in or relating to conversion of tonal character of aural signals
CH474805A (en) * 1968-08-27 1969-06-30 Ibm Method and circuit arrangement for improving the fundamental tone curve in speech synthesis
US3621150A (en) * 1969-09-17 1971-11-16 Sanders Associates Inc Speech processor for changing voice pitch
JPS55802A (en) * 1978-05-16 1980-01-07 Bulten Kanthal Ab Radiator for heating
US4409736A (en) * 1981-07-31 1983-10-18 The Charles Stark Draper Laboratory, Inc. Null seeking system for remote center compliance device

Also Published As

Publication number Publication date
LU65886A1 (en) 1974-02-12
IT962099B (en) 1973-12-20
AR201269A1 (en) 1975-02-28
CA965014A (en) 1975-03-25
ATA699872A (en) 1979-05-15
JPS4835703A (en) 1973-05-26
IL40057A (en) 1975-07-28
AU4542572A (en) 1974-02-14
BE787492A (en) 1973-02-12
CH564815A5 (en) 1975-07-31
JPS551596B2 (en) 1980-01-16
FR2150067A5 (en) 1973-03-30
ES405791A1 (en) 1976-05-16
PL95183B1 (en) 1977-09-30
DD100347A5 (en) 1973-09-12
CS195258B2 (en) 1980-01-31
IL40057A0 (en) 1972-10-29
PH9570A (en) 1976-01-16
NL7210770A (en) 1973-02-15
DE2238136C2 (en) 1984-04-19
NL172200C (en) 1983-07-18
SE383934B (en) 1976-04-05
NL172200B (en) 1983-02-16
DE2238136A1 (en) 1973-03-01
AT354126B (en) 1979-12-27

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years