JPS5787212A - Fm modulator and demodulator - Google Patents
Fm modulator and demodulatorInfo
- Publication number
- JPS5787212A JPS5787212A JP16246480A JP16246480A JPS5787212A JP S5787212 A JPS5787212 A JP S5787212A JP 16246480 A JP16246480 A JP 16246480A JP 16246480 A JP16246480 A JP 16246480A JP S5787212 A JPS5787212 A JP S5787212A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- demodulator
- changeover switches
- oscillation frequency
- pll system
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
Landscapes
- Transmitters (AREA)
Abstract
PURPOSE:To give an FM demodulating function and an FM modulating function in the PLL system, by connecting a quartz oscillating circuit and a fixed frequency dividing circuit to two inputs of a phase comparing circuit of the FM demodulator of the PLL system through changeover switches respectively. CONSTITUTION:A quartz oscillating circuit 7 and a fixed frequency dividing circuit 8 are connected to the input side of a phase comparing circuit 1 and the output side of a voltage control oscillating circuit 3 of an FM demodulator of the PLL system, which consists of the circuit 1, an LPF2, and the circuit 3, through changeover switches 6, 5 and 4. In case of FM modulation, respective changeover switches are closed as shown by dotted lines to apply a modulation signal input to the circuit 3. An oscillation frequency fO of the circuit 3 is divided by the circuit 3 and is compared in phase with an oscillation frequency fX of the circuit 7, and the output is applied to the circuit 3 through the circuit 2 to control the oscillation frequency, and an FM modulation wave is outputted from the circuit 3.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16246480A JPS5787212A (en) | 1980-11-17 | 1980-11-17 | Fm modulator and demodulator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16246480A JPS5787212A (en) | 1980-11-17 | 1980-11-17 | Fm modulator and demodulator |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5787212A true JPS5787212A (en) | 1982-05-31 |
Family
ID=15755109
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16246480A Pending JPS5787212A (en) | 1980-11-17 | 1980-11-17 | Fm modulator and demodulator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5787212A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5831602A (en) * | 1981-08-20 | 1983-02-24 | Nec Corp | Modulation and demodulation circuit |
JPS5868305A (en) * | 1981-10-19 | 1983-04-23 | Hitachi Ltd | Frequency modulating and demodulating circuit |
US5423075A (en) * | 1992-01-21 | 1995-06-06 | Temic Telefunken Microelectronic Gmbh | Combined radio transmission and reception apparatus with a PLL circuit |
JP2007166255A (en) * | 2005-12-14 | 2007-06-28 | Matsushita Electric Ind Co Ltd | High frequency transmitter-receiver and base station transmitter-receiver communicating with the high frequency transmitter-receiver |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5457944A (en) * | 1977-10-18 | 1979-05-10 | Nippon Telegr & Teleph Corp <Ntt> | Modulator and demodulator |
-
1980
- 1980-11-17 JP JP16246480A patent/JPS5787212A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5457944A (en) * | 1977-10-18 | 1979-05-10 | Nippon Telegr & Teleph Corp <Ntt> | Modulator and demodulator |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5831602A (en) * | 1981-08-20 | 1983-02-24 | Nec Corp | Modulation and demodulation circuit |
JPS5868305A (en) * | 1981-10-19 | 1983-04-23 | Hitachi Ltd | Frequency modulating and demodulating circuit |
JPH0212047B2 (en) * | 1981-10-19 | 1990-03-16 | Hitachi Ltd | |
US5423075A (en) * | 1992-01-21 | 1995-06-06 | Temic Telefunken Microelectronic Gmbh | Combined radio transmission and reception apparatus with a PLL circuit |
JP2007166255A (en) * | 2005-12-14 | 2007-06-28 | Matsushita Electric Ind Co Ltd | High frequency transmitter-receiver and base station transmitter-receiver communicating with the high frequency transmitter-receiver |
JP4581985B2 (en) * | 2005-12-14 | 2010-11-17 | パナソニック株式会社 | Endoscopic high frequency transmitter / receiver |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB556208A (en) | Arrangement for conversion of frequency modulation to phase modulation and the application thereof to the production of a frequency modulated wave from a frequency stable oscillator | |
GB1256188A (en) | Generator for producing ultrasonic oscillations | |
EP0011464A3 (en) | Circuit and method for generating modulated oscillations and a modulated oscillatory signal generated by the method | |
CH653853GA3 (en) | ||
JPS5787212A (en) | Fm modulator and demodulator | |
CA2075884A1 (en) | Integrated frequency synthesizer circuit for transmit-and-receive operation | |
CA2021335A1 (en) | Frequency modulator | |
GB1320403A (en) | Oscillator circuit for producing an oscillation frequency dependent upon an applied voltage | |
JPS55147060A (en) | Fsk and psk modulating circuit | |
JPS5740372A (en) | Control system for voltage type pulse width modulation inverter | |
JPS57180256A (en) | Fsk modulator | |
JPS5635561A (en) | Carrier regenerating device | |
SU951747A2 (en) | Transmitter of frequency manipulated oscillation without phase break | |
JPS5635559A (en) | Phase modulating device | |
JPS54129813A (en) | Composite modulation system | |
JPS55160975A (en) | Controlling circuit for inverter | |
JPS5588458A (en) | Modulation system | |
JPS5530253A (en) | Direct ssb modulation circuit | |
JPS6484948A (en) | Demodulation system for frequency modulation signal | |
JPS57152258A (en) | Fm modulator | |
JPS57135555A (en) | Phase continuous fsk modulating circuit | |
SU1019582A2 (en) | Frequency shift keying device | |
JPS57103412A (en) | Phase modulation system due to pll | |
JPS6425627A (en) | Rubidium atomic oscillator | |
DE3168960D1 (en) | Device for the recovery of a clock signal from a binary signal |