JPS5795746A - Receiver for multifrequency signal - Google Patents
Receiver for multifrequency signalInfo
- Publication number
- JPS5795746A JPS5795746A JP55171248A JP17124880A JPS5795746A JP S5795746 A JPS5795746 A JP S5795746A JP 55171248 A JP55171248 A JP 55171248A JP 17124880 A JP17124880 A JP 17124880A JP S5795746 A JPS5795746 A JP S5795746A
- Authority
- JP
- Japan
- Prior art keywords
- output
- angular frequency
- adder
- input signal
- window function
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
- H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
- H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
- H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
- H04Q1/457—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals
- H04Q1/4575—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling with conversion of multifrequency signals into digital signals which are transmitted in digital form
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
PURPOSE:To make a receiver for multifrequency signals small-size, by causing an output, which is obtained by multiplying an input signal by a window function, to pass through a primary cyclic digital filter to obtain outputs of a real part and an imaginary part and by obtaining an output proportional to the amplitude of a required angular frequency. CONSTITUTION:An input signal from a terminal 1 is multiplied by the square window function, which is supplied from a window function generator 70, in a multiplier 30, and the output is inputted to an adder 43. A filter coefficient ejomegaT (omega is a required detection angular frequency and T is the sampling period) is given by a primary cyclic digital filter consisting of adders 43-45, multipliers 35-38, and registers 50 and 51 for delay of one sampling period, and the discrete Fourier conversion is executed to output outputs of a real part and an imaginary part to terminals 21r and 21i, respectively. These outputs are squared by multipliers 33 and 34, respectively and are added by an adder 42 to transmit an output proportional to the amplitude of components of the required detection angular frequency omega to a terminal 2. On the basis of the output of the adder 42, it is discriminated whether the input signal having the required detection angular frequency omega exists or not.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55171248A JPS5795746A (en) | 1980-12-04 | 1980-12-04 | Receiver for multifrequency signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55171248A JPS5795746A (en) | 1980-12-04 | 1980-12-04 | Receiver for multifrequency signal |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5795746A true JPS5795746A (en) | 1982-06-14 |
JPH0150151B2 JPH0150151B2 (en) | 1989-10-27 |
Family
ID=15919790
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55171248A Granted JPS5795746A (en) | 1980-12-04 | 1980-12-04 | Receiver for multifrequency signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5795746A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0440028A2 (en) * | 1990-01-29 | 1991-08-07 | Dialogic Corporation | Multifrequency tone signal detector |
EP0497115A2 (en) * | 1991-02-01 | 1992-08-05 | Blaupunkt-Werke GmbH | RDS broadcast receiver |
JPH0686338A (en) * | 1991-12-31 | 1994-03-25 | American Teleph & Telegr Co <Att> | Method for detection of control signal |
-
1980
- 1980-12-04 JP JP55171248A patent/JPS5795746A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0440028A2 (en) * | 1990-01-29 | 1991-08-07 | Dialogic Corporation | Multifrequency tone signal detector |
EP0497115A2 (en) * | 1991-02-01 | 1992-08-05 | Blaupunkt-Werke GmbH | RDS broadcast receiver |
JPH0686338A (en) * | 1991-12-31 | 1994-03-25 | American Teleph & Telegr Co <Att> | Method for detection of control signal |
Also Published As
Publication number | Publication date |
---|---|
JPH0150151B2 (en) | 1989-10-27 |
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