JPS5444503A - Noise detector in optical recorder-reproducer - Google Patents
Noise detector in optical recorder-reproducerInfo
- Publication number
- JPS5444503A JPS5444503A JP11071477A JP11071477A JPS5444503A JP S5444503 A JPS5444503 A JP S5444503A JP 11071477 A JP11071477 A JP 11071477A JP 11071477 A JP11071477 A JP 11071477A JP S5444503 A JPS5444503 A JP S5444503A
- Authority
- JP
- Japan
- Prior art keywords
- noise
- spike
- signal
- pulse width
- form noise
- 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
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE: To reduce the effect of spike-form noise without impairing the quality of demodulated audio signal by detecting the presence of spike-form noise through variation in the envelope of demodulated pilot signal and creating a gate signal corresponding to the noise section.
CONSTITUTION: The integrated circuit 21 of constitution part 1 detects the envelope of the pilot signal P from a stereo decorder 16 and generates the disturbance in the envelope signal corresponding to pulse-form noise, the crest value whereof is then compared with a reference voltage in a comparator 22 and is sent out as the noise detection signal by pulses. A pulse width changing circuit 23, consisting of a monostable circuit, etc., makes the pulse width of the noise detection signal approximately equal to the pulse width of the spike-form noise. A filter circuit 24 consisting of BPF or LPF detects the spike-form noise out of the demodulated audio signal. A comparator 27 determines the pulse width of the noise section signal from the magnitude of the waveforms of integrators 25, 26 for the spike-form noise. Thereby, the effect of the spike-form noise may be reduced without impairing the quality of the demodulated audio signal.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11071477A JPS5444503A (en) | 1977-09-14 | 1977-09-14 | Noise detector in optical recorder-reproducer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11071477A JPS5444503A (en) | 1977-09-14 | 1977-09-14 | Noise detector in optical recorder-reproducer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5444503A true JPS5444503A (en) | 1979-04-09 |
Family
ID=14542602
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11071477A Pending JPS5444503A (en) | 1977-09-14 | 1977-09-14 | Noise detector in optical recorder-reproducer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5444503A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6312872U (en) * | 1986-07-11 | 1988-01-27 |
-
1977
- 1977-09-14 JP JP11071477A patent/JPS5444503A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6312872U (en) * | 1986-07-11 | 1988-01-27 |
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