JPH02210944A - Message transmission system - Google Patents

Abstract

PURPOSE:To output information as the voice from a voice output device by storing the voice information in a telephone card and using a public telephone set capable of using a telephone card. CONSTITUTION:A telephone card input means 2 detects the loading of a telephone card 7, reads out digital voice information 101 in a voice information storage area 71 and sends the information to a telephone card readout means 3. The means 4 converts the information 102 sent from the means 3 into an analog voice signal 103, which is sent to a voice output means 5. The means 5 amplifies the information 103 sent from the means 4 and sends it to a voice output device 6 as an analog voice signal 104. The output device 6 outputs the signal 104 sent from the means 5 as voice. Thus, the message transmission delivery system outputted in voice is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a public telephone that can use telephone cards and a message transmission system suitable for telephone cards.

[Conventional technology]

Conventionally, there was no voice information storage area for storing voice information in the telephone card information storage area.

[Problem to be solved by the invention]

The above-mentioned conventional technology has the disadvantage that the voice information in the telephone card cannot be output as voice from a public telephone that accepts the telephone card. SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, a technical object of the present invention is to provide a message transmission system that outputs voice information in a telephone card as voice from a telephone card-enabled public telephone.

[Means for solving problems]

According to the present invention, in a public telephone that can use a telephone card, it is detected that a telephone card having a voice information storage area capable of storing voice information is inserted into the public telephone that can use a telephone card case, and the telephone telephone card input means for reading digital voice information from the voice information storage area of the card; voice information reading means for receiving digital voice information sent from the telephone card input means; and digital voice sent from the voice information reading means. D/A conversion means for receiving information and converting it into an analog audio signal; audio output means for receiving and amplifying the analog audio signal converted by the D/A conversion means; and analog audio amplified by the audio output means. A message-so transmission system is obtained, which is characterized in that it has an audio output device that receives a signal and outputs it as audio, and outputs digital audio information in the audio information storage area of a telephone card as audio from the audio output device.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 1, in the telephone card 7.

It is composed of an audio information storage area 71 that can store audio information, and a remaining power storage area 72 that stores the remaining power.

The telephone 1 detects that the telephone card 7 is inserted into the telephone 1 and stores the voice information storage area 7 of the telephone card 7.
A telephone card input means 2 reads digital voice information from the telephone card input means 1 and sends the digital voice information 101 to a telephone card reading means 3; audio information reading means 3 to send as digital audio information 102; D/A converting means 4 to convert the digital audio information 102 sent from the audio information reading means 3 into an analog audio signal 103 and send it to the audio output means 5; D
/A audio output means 5 which amplifies the analog audio signal 103 converted by the conversion means 4 and sends the analog audio signal 104 to the audio output device 6, and outputs the analog audio signal 104 amplified by the audio output means 5 as audio. and an audio output device 6. In the above configuration, when the telephone card 7 is inserted into the telephone set l, the telephone card input means 2 detects the insertion of the telephone card 7 and inputs the digital voice information in the voice information storage area 71 of the telephone card 7. The digital voice information 101 is read out and sent to the telephone card reading means 3. The digital voice information 101 sent from the telephone card input means 2 is
The digital audio information 1 is read out by the audio information reading means 3.
02 and is sent to the D/A conversion means 4. The digital audio information 102 sent from the audio information reading means 3 is
The D/A conversion means 4 converts the analog audio signal 103 into
and sent to the audio output means 5.

Analog audio signal 103 sent from D/A conversion means 4
is amplified by the audio output means 5 and sent to the audio output device 6 as an analog audio signal 104. The analog audio signal 104 sent from the audio output means 5 is sent to the audio output device 6.
is output as audio.

FIG. 2 is a diagram representing data sampling. When the analog signal r (t) is sampled at regular time intervals, an amplitude xi (t is a natural number) is obtained at time ti (i is a natural number).

The digital voice information in the voice information storage area 71 of the telephone card 7 in FIG. 1 has an amplitude xi(
i is a natural number).

Also, according to the sampling theorem, analog signal 1 (1
) is the maximum frequency.

2×(sampling interval) or less, the analog signal 1 (1) can be restored from the amplitude xi (i is a natural number) in FIG. 2 within the range of quantization error in the amplitude direction.

〔Effect of the invention〕

As described above, according to the present invention, voice information in a telephone card can be output as voice from the voice output device using a public telephone that accepts a telephone card.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, which is a system for outputting voice from a telephone card-enabled public telephone using voice information in a voice information storage area newly installed in a telephone card. FIG. 3 is a diagram showing sampling. f(t) indicates an analog signal, and the amplitude at one time ti (t is a natural number) is indicated by xl (i is a natural number). 1...Telephone, 2...Telephone card input means. 3...Audio information reading means, 4...D/A conversion means. 5...Audio output means, 6...Audio/output device, 7...
・Telephone card, 71...Voice information storage area, 72・
・Remaining power storage area, 101 ・Digital audio information, 1
02... Digital audio information, 103... Analog audio signal.

Claims (1)

[Scope of Claims] 1) In a message transmission system in a public telephone that can use a telephone card, it is possible to detect when a telephone card having a voice information storage area capable of storing voice information is inserted into a public telephone that can use a telephone card. detect,
A telephone card input means for reading digital voice information in a voice information storage area of the telephone card; a voice information reading means for receiving digital voice information sent from the telephone card input means; and a voice information reading means for receiving digital voice information sent from the voice information reading means. receive digital audio information,
D/A conversion means for converting into an analog audio signal; audio output means for receiving and amplifying the analog audio signal converted by the D/A conversion means; receiving the analog audio signal amplified by the audio output means;
1. A message transmission method comprising a voice output device that outputs voice, and outputs digital voice information in a voice information storage area of a telephone card as voice from the voice output device.