JPS5765030A - Switching signal generating device for stereo demodulation - Google Patents
Switching signal generating device for stereo demodulationInfo
- Publication number
- JPS5765030A JPS5765030A JP14050780A JP14050780A JPS5765030A JP S5765030 A JPS5765030 A JP S5765030A JP 14050780 A JP14050780 A JP 14050780A JP 14050780 A JP14050780 A JP 14050780A JP S5765030 A JPS5765030 A JP S5765030A
- Authority
- JP
- Japan
- Prior art keywords
- output
- frequency
- division
- duty
- inputted
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D1/00—Demodulation of amplitude-modulated oscillations
- H03D1/22—Homodyne or synchrodyne circuits
- H03D1/2209—Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders
- H03D1/2236—Decoders for simultaneous demodulation and decoding of signals composed of a sum-signal and a suppressed carrier, amplitude modulated by a difference signal, e.g. stereocoders using a phase locked loop
-
- 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
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1646—Circuits adapted for the reception of stereophonic signals
- H04B1/1653—Detection of the presence of stereo signals and pilot signal regeneration
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Stereo-Broadcasting Methods (AREA)
Abstract
PURPOSE:To enable simple constitution with less number of circuit elements and to reduce dispersion in delay time, by confirming the phase relation of each frequency dividing output with logic circuits so that the relation is always as specified relation. CONSTITUTION:The output of a VCO in which the output frequency is a prescribed frequency, 228kHz, is inputted to a buffer 28 to input the output of the buffer 28 to a 1/6 frequency-divider consisting of T-FF21-23 and D-FF24, allowing to obtain two types of frequency-divided outputs different in the phase with 1/6 duty. The two types of frequency-division outputs are inputted to an RS latch 25 to output the 1/6 frequency division output in duty 50% from the latch 25. The output of the FF21 and the output of the FF24 are ANDed to obtain a 1/2 frequency-division output having different phase relation with 1/6 frequency-division output waveform with duty 50%. The 1/6 frequency-division output and the 1/2 frequency-division output being the output of the latch 25 are inputted to the D-FF26, 27 respectively to delay them by taking the frequency of the VCO output as clock, and synchronized 1/6 and 1/2 frequency division outputs are outputted for switching.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14050780A JPS5765030A (en) | 1980-10-09 | 1980-10-09 | Switching signal generating device for stereo demodulation |
US06/236,536 US4392020A (en) | 1980-02-27 | 1981-02-20 | Stereo demodulation system for an FM stereo broadcast receiver |
DE3107028A DE3107028C2 (en) | 1980-02-27 | 1981-02-25 | Stereo demodulator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14050780A JPS5765030A (en) | 1980-10-09 | 1980-10-09 | Switching signal generating device for stereo demodulation |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5765030A true JPS5765030A (en) | 1982-04-20 |
JPS6222490B2 JPS6222490B2 (en) | 1987-05-18 |
Family
ID=15270250
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14050780A Granted JPS5765030A (en) | 1980-02-27 | 1980-10-09 | Switching signal generating device for stereo demodulation |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5765030A (en) |
-
1980
- 1980-10-09 JP JP14050780A patent/JPS5765030A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6222490B2 (en) | 1987-05-18 |
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