JPS5510257A - Envelope detection system - Google Patents
Envelope detection systemInfo
- Publication number
- JPS5510257A JPS5510257A JP8319278A JP8319278A JPS5510257A JP S5510257 A JPS5510257 A JP S5510257A JP 8319278 A JP8319278 A JP 8319278A JP 8319278 A JP8319278 A JP 8319278A JP S5510257 A JPS5510257 A JP S5510257A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- phase
- full
- output
- sound signal
- 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
Links
Landscapes
- Electrophonic Musical Instruments (AREA)
Abstract
PURPOSE: To detect an envelope signal in a four-shape signal, obtained by full- wave rectifying and by adding signals phase-shifted by phase shifter circuits, at a rapid response speed by providing the phase shifter circuits which derive nearly-90°- out-of-phase signals from a musical sound signal.
CONSTITUTION: To detect a signal expressing the envelope of a musical sound signal on the basis of the input of the musical sound signal, the input signal is inputted to LPF11 to output the low-frequency component of the input musical- sound signal and the signal of this low frequency component is applied to phase shifter circuits 11 and 22 which have mutually a phase difference of approximate 90°. Then, output signals 90° out of phase are full-wave-rectified by full-wave rectifier circuits 31 and 32 and full-wave rectification outputs of circuits 31 and 32 are added together at output point (p) to obtain a four-phase full-wave rectification output basing upon the musical sound signal. This for-phase rectification output is applied to LPF12 with a smoothing circuit of a preset time constant, so that an envelope signal faithful to the musical sound signal will appear at the output of LPF12.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8319278A JPS5510257A (en) | 1978-07-07 | 1978-07-07 | Envelope detection system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8319278A JPS5510257A (en) | 1978-07-07 | 1978-07-07 | Envelope detection system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5510257A true JPS5510257A (en) | 1980-01-24 |
Family
ID=13795452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8319278A Pending JPS5510257A (en) | 1978-07-07 | 1978-07-07 | Envelope detection system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5510257A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5913405A (en) * | 1982-07-14 | 1984-01-24 | Fujitsu Ltd | Envelope detector |
JPS6373705A (en) * | 1986-09-16 | 1988-04-04 | Matsushita Electric Ind Co Ltd | Amplitude detector |
-
1978
- 1978-07-07 JP JP8319278A patent/JPS5510257A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5913405A (en) * | 1982-07-14 | 1984-01-24 | Fujitsu Ltd | Envelope detector |
JPS6373705A (en) * | 1986-09-16 | 1988-04-04 | Matsushita Electric Ind Co Ltd | Amplitude detector |
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