JPH02126756A - Tone dialer - Google Patents

Abstract

PURPOSE:To surely send the PB signal of the telephone number of an opponent by providing a single tone generating means and making the carbon particle of a carbon transmitter acoustically coupled uniform prior to sending a PB signal in accordance with the telephone number to a telephone line. CONSTITUTION:A keyboard 1 key-inputs a telephone number to be stored into a memory 2, an instruction, etc., for a CPU 4 and a CPU 4 controls a tone dialer system in accordance with the instruction from the user inputted from the keyboard 1 and outputs the control code to a dual tone multi-frequency oscillator 5. Before a push button(PB) signal is sent, a single tone generating means 7 to generate an acoustic signal composed of the wave of one frequency for a prescribed time is provided, and prior to the sending of the PB signal, the offsetting of the carbon particle of a carbon transmitter is uniformed. Thus, even at the time of being the acoustic signal to display a first figure of the inputted telephone number, the PB signal is surely sent.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a tone dialer that transmits a PB (button button) signal by acoustic coupling with a carbon transmitter of a telephone.

<Prior Art> Conventionally, a tone dialer acoustically coupled to a carbon transmitter of a telephone transmits a PB double signal to a telephone line in the following manner. That is, the phone number of the person you want to call is read out from the storage section by key input from the keyboard, and the D
It is input to a TMF (dual tone multi-frequency) oscillator.

Then, under the control of the CPU (Central Processing Unit), the DTMF oscillator generates sine waves of different frequencies output from two built-in oscillators for each digit of the telephone number. The signals are mixed to generate a tone signal and sent to the sounding body.

For example, when dialing 01234-5-671119, as shown in Figure 4, a tone signal consisting of a mixed wave of two frequency waves corresponding to each digit of the telephone number and a tone signal with an amplitude of 0 are sent out. -Repeat every certain period of time. Based on the tone signal, the sounding body outputs an acoustic signal corresponding to the tone signal at regular intervals.

The acoustic signal output from the sounding body is input to an acoustically coupled carbon transmitter. Then, the diaphragm of the carbon transmitter vibrates, and the pressure applied to the carbon particles filled between the movable electrode and the fixed electrode connected to the diaphragm changes, causing a change in the contact resistance of the carbon particles. do. At this time, a constant DC voltage is applied between the movable electrode and the fixed electrode. Therefore, a current having an amplitude change according to the sound pressure is extracted as an output and sent to the telephone line as a PB dial signal.

<Problems to be Solved by the Invention> However, the conventional tone dialer described above has the following problems. In other words, in carbon transmitters widely used in standard telephones in Japan and the United States, a diaphragm vibrates in response to the sound intensity of an input acoustic signal, and the vibration between a movable electrode and a fixed electrode connected to this diaphragm occurs. The contact resistance of the carbon particles filled in between is changed by the vibration of the diaphragm.

However, if the carbon particles are left undisturbed, they become lopsided and the sensitivity decreases. When transmitting a PB dial signal with a tone dialer, if the carbon particles of the carbon transmitter are uneven, the sensitivity will be reduced and the first digit or the beginning of the acoustic signal representing the telephone number entered into the carbon transmitter will be When it comes to acoustic signals representing several digit numbers, it is not possible to generate enough PB multiplied signals to operate the exchanger, and there is a problem in that it is not possible to reliably send the PB multiplied signal of the intended recipient's telephone number. .

Therefore, an object of the present invention is to restore the sensitivity of a carbon transmitter, which has been reduced due to the unevenness of carbon particles, prior to sending out a PB multiplied signal corresponding to the first digit of an input telephone number. To provide a tone dialer which can reliably send a PB multiplied signal of a telephone number of a called party.

Means for Solving the Problems> In order to achieve the above object, the present invention generates a low frequency wave oscillated from one oscillator and a low frequency wave oscillated from the other oscillator in response to the digits of an input telephone number. A tone dialer is capable of outputting an acoustic signal consisting of a mixed wave with a high frequency wave, and transmitting a PB multiplied signal corresponding to the acoustic signal to a telephone line by acoustic coupling with a carbon transmitter of a telephone, A single tone generating means is provided for generating an acoustic signal consisting of a wave of one frequency for a predetermined period of time before transmitting the PB multiplied signal, and the unevenness of the carbon particles of the carbon transmitter is made uniform before transmitting the PB signal. It is characterized by doing the following.

Function> When the numbers constituting the telephone number are input and based on the input numbers, an acoustic signal consisting of a wave of one frequency is generated for a predetermined period of time by the single tone generating means before the PB multiplied signal is transmitted. be done.

Then, the unevenness of the carbon particles in the carbon transmitter of the acoustically coupled telephone is equalized by the vibration based on the generated acoustic signal consisting of waves of one frequency. Thereafter, one oscillator oscillates a low frequency wave, and at the same time the other oscillator oscillates a high frequency wave, corresponding to the digits of the telephone number input above. An acoustic signal consisting of a mixed wave of two waves is output.

Then, a PB multiplied signal corresponding to this output acoustic signal,
It is transmitted via an acoustically coupled carbon transmitter.

At that time, as mentioned above, the carbon particles in the carbon transmitter are uniformized in advance, so even if the acoustic signal represents the first digit of the telephone number input above, the PB is guaranteed.
A double signal is sent out.

<Example> Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is a block diagram of a tone dialer according to the present invention. The keyboard 1 is used to input telephone numbers to be stored in the memory 2, instructions to the CPU 4, and the like. The memory 2 is a storage section for storing necessary user data such as frequently used telephone numbers,
It has a telephone number registration section 1G for registering telephone numbers, a calling number storage section 11 for storing telephone numbers read from the telephone number registration section 10, and the like. The display unit 3 displays operation results of the CPU 4, instructions to the user, etc. under the control of the CPU 4. The CPU 4 controls the tone dialer system according to user instructions inputted from the keyboard 1, and outputs a control code to the DTMF oscillator 5.

The DTMF oscillator 5 is internally equipped with two oscillators, and outputs a mixed wave obtained by mixing sine waves generated from the two oscillators to the low frequency amplifier 8 as a tone signal. One of the two oscillators is a low tone oscillator 6, and the other is a column tone oscillator 7. The low tone oscillator 6 oscillates a sine wave with a frequency corresponding to the row of input numbers on the keyboard l, and 697tl
It oscillates four types of sine waves: 770Hz, 852Hz, and 941Hz. Further, the column tone oscillator 7 oscillates a sine wave with a frequency corresponding to the column of the input numbers on the keyboard l, and generates sine waves of 1209 Hz and 133 Hz.
It oscillates four types of sine waves: 6Hz, 1477Hz, and 1633Hz.

The low frequency amplifier 8 amplifies the audible frequency range of the tone signal input from the DTMF oscillator 5 and outputs it to the sounding body 9. Based on the amplified signal output from the low frequency amplifier 8, the sounding body 9 outputs an acoustic signal corresponding to each digit of the telephone number.

The tone dialer configured as described above operates as follows to send a PB dial signal to the telephone line. A telephone number read out from the telephone number registration section 10 of the memory 2 in response to an instruction from the keyboard 1 is stored in the calling number storage section 11 of the memory 2. Next, when a key (hereinafter referred to as dial key) instructing the CPU 4 to send the PB signal of the read telephone number to the telephone line is input, the DTMF oscillator 5 is activated later according to the control signal from the CPU 4. A single tone signal is output for a predetermined period of time as described in detail.

Thereafter, a control code corresponding to the telephone number stored in the calling number storage section 11 is inputted from the CPU 4 to the DTMF oscillator 5. Then, depending on the input control code,
The low tone oscillator 6 oscillates a sine wave with a frequency corresponding to the row in the array of numbers on the keyboard l represented by the input control code. At the same time, the column tone oscillator 7 oscillates a sine wave with a frequency corresponding to the column of the number represented by the input control code on the keyboard l. Then, a mixed wave of the sine wave oscillated from the low tone oscillator 6 and the sine wave oscillated from the column tone oscillator 7 is sent to the DTMF oscillator 5 as a tone signal.
(hereinafter referred to as dual tone mode)
. Therefore, the input key can be identified from the frequency of the mixed wave.

In this way, the tone signal oscillated from the DTMF oscillator 5 is amplified in the audible frequency range by the low frequency amplifier 8 and input to the sounding unit 9, which outputs an acoustic signal corresponding to each digit of the telephone number. Ru.

Then, an acoustic signal corresponding to each digit of the telephone number outputted from the sounding body 9 is inputted to a carbon transmitter (not shown). Then, through the carbon particles filled between the movable vibrating electrode and the fixed vibrating electrode connected to the diaphragm of the carbon transmitter, a current with an amplitude width corresponding to each digit of the telephone number is generated. It is converted and output as a PB multiplied signal to the telephone line.

By the way, the sensitivity of the carbon transmitter decreases due to the carbon shifting due to the carbon transmitter being left unattended. In some cases, the acoustic signal corresponding to the first digit or the first several digits of a telephone number is not converted into a PB signal by the carbon transmitter. In this case, the following methods are available to help restore the sensitivity of the carbon transmitter whose sensitivity has decreased.

(1) Apply a mechanical shock to the carbon transmitter from the outside to correct the misalignment of the carbon particles (hereinafter referred to as refreshing the carbon particles).

(2) Input sound at an appropriate volume into the carbon transmitter to refresh the offset carbon particles.

This invention refreshes carbon particles based on the method (2) above. That is, the above DTM
The F oscillator 5 is configured to be able to output only the sine wave from either the low tone oscillator 6 or the column tone oscillator 7 as a tone signal under the control of the CPU 4 (hereinafter referred to as single tone mode).

The carbon particles are refreshed by the single tone acoustic signal in this single tone mode. At this time, the single-tone acoustic signal is also converted into an electrical signal by the carbon transmitter and transmitted over the telephone line. However, since this electrical signal has a single tone frequency, the exchange determines that there is no PB multiple signal.

The tone signal output operation will be explained below according to the flowchart of FIG. Here, the required telephone number (for example, "5-6789") is searched from among the telephone numbers already registered in the telephone number registration section 10 of the memory 2, and is stored in the calling number storage section 2 of the memory 2. Assume that it is stored.

In step S1, it is determined whether or not the dial key has been input. As a result, if it is detected that the dial key has been input, the process advances to step S2; if not, the process waits until the next dial key is input.

In step S2, according to the control code from the CPU 4,
DTMF oscillator 5 enters single tone mode.

That is, 697
2,770H2,852112,9411121209
Hz, 1336Hz, 1477Hz and 1633)I
A sine wave having one of the frequencies Z is oscillated for a predetermined period of time, and a single tone signal is output. The single-tone acoustic signal output from the sounding body 9 refreshes the acoustically coupled carbon particles of the carbon transmitter.

After a single tone signal is output for a predetermined period of time,
A control code representing "pause" is output from the CPU 4 to the DTMF oscillator 5 for a predetermined period of time. As a result, the DTMF' oscillator 5 outputs a tone signal with zero amplitude during that time. Thereafter, the DTMF oscillator 5 enters dual tone mode.

In step S3, the CPU 4 controls the calling number storage section l! of the memory 2! The first number of the telephone numbers stored in , that is, "5" in this embodiment, is read out, and a control signal representing "5" is output to the DTMF oscillator 5 .

Then, a 770 Hz sine wave is oscillated from the low tone oscillator 6 of the DTMF oscillator 5, and a 1336 tlz sine wave is oscillated from the column tone oscillator 7, and as a result, D
The TMF oscillator 5 outputs a tone signal consisting of a mixed wave of the two sine waves for a predetermined period of time.

After the dual tone tone signal is output for a predetermined time,
A control code representing "pause" is output from the CPU 4 to the DTMF oscillator 5 for a predetermined period of time. Then, the DTMF oscillator 5 outputs a tone signal with an amplitude of 0 during that time.

In step S4, the CPU 4 reads the next number "6" from the calling number storage section 11 of the memory 2, and
A control signal representing DTMF oscillator 5 is output to DTMF oscillator 5.

Then, a 770 Hz sine wave is oscillated from the low tone oscillator 6 of the DTMF oscillator 5, and a 1477 Hz sine wave is oscillated from the column tone oscillator 7, and as a result, DT
The MP oscillator 5 outputs a tone signal consisting of a mixed wave of the two sine waves for a predetermined period of time. Next, the CPU 4 outputs a control code indicating "pause" to the DTMF oscillator 5 for a predetermined period of time. Then, the DTMF oscillator 5 outputs a tone signal with an amplitude of O during that time.

In step S5, the next number "7" is processed in the same manner as described above, and the low tone oscillator 6 generates 852Hz.
A sine wave of 120 is oscillated from the column tone oscillator 7.
A 9 Hz sine wave is oscillated, and as a result, the DTMF' oscillator 5 outputs a tone signal consisting of a mixed wave of the two sine waves for a predetermined period of time.

Then, a tone signal with an amplitude of O is output for a predetermined period of time.

In step S6, the next number "8" is processed in the same manner as described above, and the low tone oscillator 6 generates 852Hz.
A sine wave is oscillated, and column tone oscillators 7 to 133
A 6tlz sine wave is oscillated, and as a result, the DTMF oscillator 5 outputs a tone signal consisting of a mixed wave of the two sine waves for a predetermined period of time.

Then, a tone signal with zero amplitude is output for a predetermined period of time.

In step S7, the next number "9°" is processed in the same manner as described above, and the low tone oscillator 6 generates 852Hz.
A sine wave of 147 is oscillated from the column tone oscillator 7.
A sine wave of 711z is oscillated, and as a result, the DTMF oscillator 5 outputs a tone signal consisting of a mixed wave of the two sine waves for a predetermined period of time.

Thereafter, the process returns to step S1 and waits for the next dial key to be input.

As described above, in the present invention, before the DTMF oscillator 5 outputs a PB multiplied signal corresponding to the first digit of the telephone number using the dual tone mode, the single tone acoustic signal is output to the sounding body using the single tone mode of the DTMF oscillator 5. 9, the carbon particles can be refreshed by the vibration caused by the single tone acoustic signal.

In the above embodiment, the telephone number registration section 10 of the memory 2
The system calls the required phone number from among the registered phone numbers and outputs a tone signal. However, the present invention is not limited to this, and the keyboard I
You can also input the tone signal by directly inputting the telephone number using the numeric keys.

In the above embodiment, the low tone oscillator 6 or the column tone oscillator 7 of the DTMF oscillator 5 is used as the single tone generating means. However, the present invention is not limited to this, and it goes without saying that a single tone generating means may be provided separately.

<Effects of the Invention> As is clear from the above, the tone dialer of the present invention is equipped with a single tone generation means for generating an acoustic signal consisting of a wave of one frequency for a predetermined period of time before transmitting the PB multiple signal. The carbon particles in the carbon transmitter of the acoustically coupled telephone are equalized before the PB double signal corresponding to the digits of the input telephone number is sent to the telephone line. P corresponding to the number of
Prior to transmitting the B-fold signal, it is possible to restore the sensitivity of the carbon transmitter, which has been reduced due to the unevenness of the carbon particles. Therefore, it is possible to reliably send the PB multiple signal of the telephone number of the intended party.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a tone dialer according to an embodiment of the present invention, FIG. 2 is a flowchart of tone signal output,
FIG. 3 is a waveform diagram of a tone signal, and FIG. 4 is a waveform diagram of a tone signal in a conventional tone dialer. 7.Keyboard, 2.Memory, 3.Display section, 4.CPU. 5...DTMF oscillator, 6...Low tone oscillator, 7...Column tone oscillator, 8...Low frequency amplifier, 9...Sounding body, lO...Telephone number registration unit, 11... Calling number storage. Patent applicant Shap Co., Ltd.

Claims (1)

[Claims] (1) Outputs an acoustic signal consisting of a mixed wave of a low frequency wave oscillated from one oscillator and a high frequency wave oscillated from the other oscillator, corresponding to the digits of the input telephone number. , in a tone dialer that can send a PB signal corresponding to the above-mentioned acoustic signal to a telephone line by acoustic coupling with a carbon transmitter of a telephone, an acoustic signal consisting of a wave of one frequency is transmitted before sending the above-mentioned PB signal. A tone dialer comprising a single tone generating means that generates a single tone for a predetermined period of time, and equalizes the unevenness of the carbon particles of the carbon transmitter prior to sending out the PB signal.