JPH04170143A - Dial type telephone set - Google Patents

Abstract

PURPOSE:To obtain the inexpensive system with high reliability without making the circuit complicated by providing the circuit receiving an impulse signal relating to a dial pulse signal according to the analog technology and outputting numeral information to the telephone set. CONSTITUTION:When an input level of an impulse signal generated by dialing from a sender side after line connection and converted via an exchange is adjusted to a prescribed value or below at a level adjustment circuit and the adjusted level is outputted to a filter circuit, the filter circuit 2 eliminates a harmonic component of the impulse signal whose level is adjusted and a periodic signal is outputted to a comparator circuit 3. The comparator circuit 3 compares the periodic signal with a predetermined threshold level and when the periodic signal is larger than the threshold level, a count signal is outputted to a counter circuit 4. The counter circuit 4 counts the count signal and outputs a numeral signal to a numeral conversion output section 5, which converts the numeral signal to a relevant code and outputs the result and also outputs a numeral information detection signal to a count control section 6. Thus, the inexpensive dial telephone set with high reliability is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dial telephone that recognizes numerical information by receiving modulated impulse signals via an exchange using an analog circuit.

[Prior Art] FIG. 3 is an explanatory diagram of a dial pulse detection circuit provided in a conventional dial type telephone disclosed in, for example, Japanese Unexamined Patent Publication No. 61-224696. In the figure, (10) is A/D
At the converter, dial pulses from the transmitting side send signals to the exchange (
A/D conversion is performed on the modulated dial signal for the impulse response generated via the dial signal (not shown). (11) is the analysis section, which uses the autocorrelation function method and cepstral analysis to
The converter (10) removes noise, etc. from the dial signal converted and output, extracts and outputs a periodic signal. (12) is a pulse counter, consisting of a reversible counter, which is processed by the analyzer (11). Count the number of periodic pulses analyzed.

(13) is a time detection section that counts the break time of the periodic pulse from the analysis section (11). (14) is a determination unit that determines the number of dial pulses based on the count output from the pulse counter (12) and the count output from the time detection unit (13).

A conventional rotary telephone is constructed as described above, and has a fourth
The figure is a diagram showing the waveform of a periodic pulse analyzed by the analysis section of FIG. 3, and the operation will be explained.

First, a dial signal modulated from the exchange is A/D converted by an A/D converter (10), and the periodicity of the A/D converted dial signal is analyzed by an analyzer (11), and it is determined as a break signal. A periodic pulse having a make signal is output to a pulse counter (12) and a time detection section. Then, the time detection section (13) counts the period of the break signal of the periodic pulse, counts the entire period of the dial signal, and when detecting the next pulse before counting the period of the break signal, the time detection section (13) counts the period of the break signal of the periodic pulse. The count number is decremented for (12). In addition, a pulse counter (1
2) When counting the period of the periodic pulse break signal and counting the next pulse, set the count value to -1,
Do not count make signals. Then, the count value (break period value) from the pulse counter (12) and the count value (time output value) from the time detection unit (13) are input to the determination unit (14), and the determination unit (14) calculates based on these inputs (uses the output from the pulse counter as an address signal, outputs the address signal to a ROM having a time table corresponding to this address signal, and outputs a time value. On the other hand, the time detector ( The difference between the time output value from 13) and the time value from the ROM is calculated, and if the result of this calculation is within a predetermined value, the pulse counter (12) is calculated.
) was output as a dialed number.

[Problems to be Solved by the Invention] The conventional dial telephone as described above is equipped with a means for converting the impulse response related to the dial pulse into a digital signal, which makes the circuit complicated and expensive, making it difficult to create an inexpensive system. The problem was that it could not be provided.

The present invention has been made in order to solve such problems, and an object of the present invention is to obtain a dial telephone equipped with a dial pulse recognition unit that is inexpensive and highly reliable by using analog technology and not performing digital conversion. do.

[Means for Solving the Problems] The dial type telephone according to the present invention inputs an impulse signal generated by dial rotation from the transmitting side after a line is connected and is modulated via an exchange, and controls the input level to be below a certain value. a level adjustment circuit that adjusts to A comparator circuit that compares the count signal with a threshold value and outputs a count signal if it is larger than the threshold value, a counting circuit that counts the count signal from the comparator circuit by 4 and outputs a numerical signal, and a A numerical conversion output section that converts the numerical signal into a corresponding code and outputs the numerical information as well as a numerical information detection signal, and initializes the count value of the counting circuit by the numerical information detection signal from the numerical conversion output section. The dial pulse recognition unit includes a counting control unit that outputs a reset signal to change the number of pulses.

[Function] In the present invention, after the line is connected, the input level of the impulse signal generated from the transmitting side by dial rotation and modulated via the exchange is adjusted to below a certain value by the level adjustment circuit, and then sent to the filter circuit. Upon output, the filter circuit removes harmonic components of the level-adjusted impulse signal and outputs a periodic signal to the comparator circuit. The comparison circuit compares the periodic signal with a predetermined threshold, and if the periodic signal is greater than the threshold, outputs a count signal to the counting circuit. The counting circuit counts the count signal and outputs the numerical signal to the numerical conversion output section, and the numerical conversion output section converts the numerical signal into a corresponding code and outputs the above numerical information, and also controls the numerical information detection signal by counting. output to the section.

The counting control section outputs a reset signal to the counting circuit in response to the numerical information detection signal, and initializes the count value of the counting circuit.

[Embodiment] FIG. 1 is a block circuit diagram of an embodiment of the present invention. In the figure, (1) is a level control circuit, which consists of a lead level detection circuit, etc., and reads the modulated dial signal (a) from an exchange (not shown), and calculates the read level value. Slice the upper limit and read the signal (la)
Output. (2) is a filtering circuit, which includes a bypass filter and the like, and removes harmonic components of the dial signal (1a) and outputs the filtered signal.

(3) is a comparison circuit, which consists of a comparator, etc., and the threshold value set in the comparison circuit (3) and the filter circuit (
2) and outputs a square wave pulse count signal (la) when the read signal (2a) is larger than the threshold value.

(4) is a counting circuit, consisting of a counter, etc., and a comparison circuit (
The number of pulses of the count signal (3a) outputted from 3) is counted, and the count result is output as count data (not shown) (4a). (5) is a numerical conversion output unit, which consists of a ROM etc., and is a count data output unit (4) output from the counting circuit (4).
a) and outputs numerical data (not shown) (5a) to a control section (not shown), and outputs a numerical information detection signal (5b) to a counting control section (described later).

(6) is a counting control section, which includes a reset circuit, etc., and is a numerical information detection signal (5) output from the numerical conversion output section (5).
b) outputs a reset signal (6a) to the counting circuit (4) to reset the count value.

(7) is the level control circuit (1) and the filter circuit (
2), a dial pulse recognition section consisting of a comparison circuit (3), a counting circuit (4), a numerical conversion output section (5), and a counting control section (B).

The dial pulse recognition section provided in the dial type telephone of the present invention is constructed as described above, and FIG. 2 is a timing chart showing the operation of FIG. 1, and the operation will be explained.

First, when the modulated dial pulse signal (impulse signal) (a) from the exchange is input to the dial pulse recognition section (7), the level control circuit (1) controls the signal level to be below a certain value. The read level is adjusted by performing gain adjustment (manual gain adjustment or automatic gain adjustment), and the adjusted read signal (1a) is sent to the filtering circuit (2).

The filtering circuit (2) removes harmonic components from the input read signal (1a) and outputs it to the comparison circuit (3). Comparison-circuit (3) receives the read signal (2a) from which its harmonic components have been removed.
) is compared with an internally set threshold value, and if the value of the read signal (2a) is larger than the threshold value, the square wave pulse count signal (3a) is sent to the counting circuit (
4) Output.

The counting circuit (4) counts the count signal (3a) and outputs the result as count data (4a) to the numerical conversion output section (5). The numerical conversion output unit (5) converts the count data (4a) into numerical data (5a) based on the following formula using an internal program such as a ROM.

Numerical data - Count data 1 (However, if the numerical data is less than 0 or more than 11, it will be treated as an error. Also, if the numerical data is 10, it will be converted as 0.) Then, the converted numerical data (5a) will be sent to the control unit. (not shown) to determine the numerical value, and the counting control section (
6) outputs a numerical information detection signal (5b).

The counting control unit (6) receives the input numerical information detection signal (5b)
As a result, a reset signal (6a) is output to the counting circuit (4). The counting circuit (4) then resets the previously counted value.

In this way, by configuring the dial six recognition section (7) with an analog circuit, the circuit can be avoided from becoming complicated.
The dial signal (a) input from the exchange can be continuously received.

[Effects of the Invention] As described above, according to the present invention, by providing a circuit that receives an impulse signal related to a dial pulse signal using analog technology and outputs numerical information, it is possible to reduce the cost without complicating the circuit. can provide a highly reliable system.

[Brief explanation of drawings]

FIG. 1 is a block circuit diagram of an embodiment of the present invention, FIG. 2 is a timing chart showing the operation of FIG. 1, and FIG. 3 is an explanatory diagram of a dial pulse detection circuit provided in a conventional dial-type electric appliance. FIG. 4 is a diagram showing a periodic pulse waveform analyzed by the analysis section of FIG. 3. In the figure, (1) is the level control circuit, (2
) is a filter circuit, (3) is a comparison circuit, (4) is a counting circuit,
(5) is a numerical conversion output section, (6) is a counting control section, (7)
is a dial pulse recognition section. Patent Applicant Oki Electric Industry Co., Ltd. Agent Patent Attorney Muneharu Sasaki = 11-

Claims (1)

[Scope of Claims] A level adjustment circuit that inputs an impulse signal generated by dial rotation from a transmitting side after a line is connected and is modulated via an exchange, and adjusts the input level to a certain value or less; and the level adjustment circuit. A filtering circuit that removes harmonic components of the impulse signal adjusted by and outputs a periodic signal, and compares the periodic signal from the filtering circuit with a predetermined threshold, and A comparison circuit that outputs a count signal when the count signal is larger; a counting circuit that counts the count signal from the comparison circuit and outputs a numerical signal; and converts the numerical signal from the counting circuit into a corresponding code to generate the numerical information. and a counting control section that outputs a reset signal that initializes the count value of the counting circuit using the numerical information detection signal from the numerical conversion output section. A dial telephone characterized by being equipped with a dial pulse recognition section.