GB1432765A - Dynamic range modifying circuits - Google Patents
Dynamic range modifying circuitsInfo
- Publication number
- GB1432765A GB1432765A GB2661075A GB2661075A GB1432765A GB 1432765 A GB1432765 A GB 1432765A GB 2661075 A GB2661075 A GB 2661075A GB 2661075 A GB2661075 A GB 2661075A GB 1432765 A GB1432765 A GB 1432765A
- Authority
- GB
- United Kingdom
- Prior art keywords
- path
- expanders
- compressors
- feedforward
- limiter
- 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
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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
- H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
- H03G9/025—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers frequency-dependent volume compression or expansion, e.g. multiple-band systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Reduction Or Emphasis Of Bandwidth Of Signals (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
Abstract
1432765 Compressors and expanders DOLBY LABORATORIES Inc 30 April 1973 [2 May 1972] 26610/75 Divided out of 1432763 Heading H4R In compressors and expanders having a linear main path and a non-linear further path exhibiting limiting or conveying Specification 1,432,763 characteristics, these characteristics are respectively provided by a conveyer or a limiter in negative feedback or negative feedforward configurations relative to a parallel path. Fig. 12 shows a type 1 compressor having a linear main path 10 and a positive feedforward further path 12 with a limiter composed of a direct and a negative feedforward conveying path "CON", the filter 50 defining an operative passband. The gains of the two circuit paths in the further path 12 are the same at high signal level to produce cancellation, i.e. limiting, as opposed to reduction in type 3 compressors (Fig. 5a, not shown). Similarly the low level gains are the same in a conveyer formed of a negative feedforward limiter (Fig. 10, not shown). The loop gains are high in the remaining two configurations to effect cancellation as opposed to tucking in types 1 and 2 expanders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2661075A GB1432765A (en) | 1972-05-02 | 1972-05-02 | Dynamic range modifying circuits |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2040672A GB1432763A (en) | 1972-05-02 | 1972-05-02 | Compressors expanders and noise reduction systems |
| GB2661075A GB1432765A (en) | 1972-05-02 | 1972-05-02 | Dynamic range modifying circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1432765A true GB1432765A (en) | 1976-04-22 |
Family
ID=26254654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2661075A Expired GB1432765A (en) | 1972-05-02 | 1972-05-02 | Dynamic range modifying circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1432765A (en) |
-
1972
- 1972-05-02 GB GB2661075A patent/GB1432765A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 19930429 |