GB1406831A - Controlled delay line signal processor for sound reproduction - Google Patents
Controlled delay line signal processor for sound reproductionInfo
- 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
Links
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 230000003111 delayed effect Effects 0.000 abstract 1
- 238000009795 derivation Methods 0.000 abstract 1
- 239000000945 filler Substances 0.000 abstract 1
- 238000009499 grossing Methods 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
- H04B3/10—Control of transmission; Equalising by pilot signal
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Speech 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
- G10L21/04—Time compression or expansion
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B21/00—Head arrangements not specific to the method of recording or reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/08—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape
- H03K4/48—Generating pulses having essentially a finite slope or stepped portions having triangular shape having sawtooth shape using as active elements semiconductor devices
- H03K4/50—Generating 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
- H03K4/501—Generating 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
- H03K4/502—Generating 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
-
- 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
- H04B1/66—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 reducing bandwidth of signals; for improving efficiency of transmission
-
- 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
- H04B1/66—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 reducing bandwidth of signals; for improving efficiency of transmission
- H04B1/662—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 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.
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)
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)
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 |
-
0
- BE BE787492D patent/BE787492A/en not_active IP Right Cessation
-
1972
- 1972-07-31 PL PL1972157037A patent/PL95183B1/en unknown
- 1972-08-03 DE DE2238136A patent/DE2238136C2/en not_active Expired
- 1972-08-07 CS CS725500A patent/CS195258B2/en unknown
- 1972-08-07 NL NLAANVRAGE7210770,A patent/NL172200C/en active
- 1972-08-07 IL IL40057A patent/IL40057A/en unknown
- 1972-08-11 FR FR7229026A patent/FR2150067A5/fr not_active Expired
- 1972-08-11 DD DD165020A patent/DD100347A5/xx unknown
- 1972-08-11 GB GB3755372A patent/GB1406831A/en not_active Expired
- 1972-08-11 ES ES405791A patent/ES405791A1/en not_active Expired
- 1972-08-11 CH CH1195972A patent/CH564815A5/xx not_active IP Right Cessation
- 1972-08-11 LU LU65886A patent/LU65886A1/xx unknown
- 1972-08-11 CA CA149,248A patent/CA965014A/en not_active Expired
- 1972-08-11 SE SE7210455A patent/SE383934B/en unknown
- 1972-08-11 AR AR243541A patent/AR201269A1/en active
- 1972-08-11 PH PH13796*UA patent/PH9570A/en unknown
- 1972-08-12 IT IT52176/72A patent/IT962099B/en active
- 1972-08-14 AT AT699872A patent/AT354126B/en not_active IP Right Cessation
- 1972-08-14 JP JP7281375A patent/JPS551596B2/ja not_active Expired
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 |