JPS6216638A - Transmitter - Google Patents

Abstract

PURPOSE:To realize a desired system by a simple circuit, by switching and transmitting automatically and alternately a digital data and voice information by the same transmitter. CONSTITUTION:By turning on a start switch 8, a cassette deck 1 is set to a stand-by state through an input/output port 6-4. Subsequently, a data sent out of a communication control LSI 6-1 is converted by an MSK modulating part 2-1, converted to, for instance, an FM modulated wave by a modulator 2-3 through a changeover switch 2-2, and transmitted through an antenna 2-4. When the final data is transmitted, the cassette deck 1 is released from the stand-by, a voice is transmitted, the control signal of the end of voice information is detected by a control signal detecting circuit 3, compared with a threshold value by a comparator 4, inverted by an inverter 5 and the input/output port is controlled.

Description

[Detailed Description of the Invention] (Summary) In a transmitter, audio information is recorded on one channel of a cassette deck, and a control signal is recorded on the other channel in response to the end of the audio information. When the final data is sent out, the cassette deck is activated and audio information is sent, and when a control signal is detected, the cassette deck is put into standby mode and the digital data is sent. The transmission of ``ζ'' and the transmission of audio information can be automatically and alternately repeated.

[Industrial application field]

The present invention relates to a transmitter, and more particularly to a transmitter that repeatedly transmits digital data and audio information in a time-division manner using the same modulator.

The idea is to create a service in which audio information and digital data with a certain content are alternately and repeatedly transmitted in a time-sharing manner, and the receiving side visually displays the digital data on a CRT, for example, and explains the content using audio. It will be done.

In this case, it is possible to use a stereo cassette deck with pre-recorded messages as the audio information source, automatically detect the end of audio transmission and switch to data transmission, and switch to audio transmission when data transmission ends. desirable.

The present invention is intended to be applied to such cases so that a desired system can be realized with a simple circuit.

[Conventional technology]

The use of cassette decks to transmit audio information is conventional. It is also well known to transmit digital data. However, it has never been done to use a cassette deck as a source of audio information and to transmit that information and digital data using the same modulator.

Therefore, no transmitter has been proposed that can automatically switch transmission between audio information and digital data as described above.

[Problems to be Solved by the Invention] The present invention attempts to solve the problems of the prior art as described above. In a transmitter that continuously transmits digital data by alternating and repeating it in a time-division manner, it automatically detects the end of audio transmission and switches to data transmission, and also switches to audio transmission when data transmission ends. The aim is to make it possible to do so.

[Means for solving problems]

FIG. 1 shows the basic configuration of the present invention.

Reference numeral 101 denotes a cassette deck, which records an audio signal on one channel and records a control signal corresponding to the end of the audio information on the other channel.

Reference numeral 102 is a data transmitter, which transmits digital data.

Control signal detection means 103 detects a control signal from the cassette deck.

Reference numeral 104 denotes a control unit which, when a control signal is detected, puts the cassette deck in standby state and transmits digital data from the data transmitting unit, and when the final data is sent from the data transmitting unit, releases the cassette deck from standby and transmits audio information. Controls sending.

(Function) With the above configuration, when data is transmitted from the data transmitter and the final data is sent out, the cassette deck is activated and audio information is sent out, and control information indicating the end of the audio information is detected. At this time, control is repeatedly performed to put the cassette deck on standby and transmit data from the data transmitter again, so that digital data and audio information can be alternately switched and transmitted.

〔Example〕

FIG. 2 shows the configuration of an embodiment of the transmitter of the present invention. In the figure, l is a cassette deck, 2 is a transmitting section, 3 is a control signal detection circuit, 4 is a comparator, 5 is an inverter, 6 is a communication control section and a data transmitting section, 7 is a data input section, and 8 is a start switch. ' It is.

In the cassette deck 1, (a) is the R channel audio output terminal, (b) is the L channel audio output terminal, (
C) is a ``po'' sentence control terminal. The pause control terminal tc+ puts the cassette deck 1 in a pause state when its input is at a high level "H", and releases the pause when its input is at a low level "I-". In the transmitter 2, 2-1 is M S
K (Minimum Frequency 5hi
ft Keying) modulation section, 2-2 is a changeover switch,
2-3 is a modulator, and 2-4 is an antenna. Further, in the communication control unit and data transmission unit 6, 6-1 is a communication control LSI, Miro-2 is a transmission clock (TXC) generation unit, and 6-
3 is a central control unit (CPU), and 6-4.6-5 is an input/output port. In the communication control LSI 6-1, +d
) is the transmission data output terminal, (el is the modulator control terminal. When the signal 11Ts of the modulator control terminal te+ is "H", it is in the transmission mode, and when it is "L", it is in the transmission stop state. In draw 4, ffl is a switching control terminal between digital data and audio information, and “■1
”, the digital data goes into the transmitting state and the cassette deck 1 goes into the standby state, and when "I," the standby is released and goes into the audio transmitting state.fgl is the audio end detection signal input terminal, and lt+) is the transmission start signal. In addition, the output of the inverter 5 (11 is the control signal detection output, which is normally in the state of "1.", but when the control signal from the terminal +a+ is detected,
The data input section 7 serves as a terminal, and includes, for example, a keyboard.

FIG. 3 is an operational flowchart of the transmitter shown in FIG. 2, and provides a detailed explanation of the present invention. Figure 4 explains the recording state of a cassette tape.
Indicates the information of the L channel and R channel, respectively, and
, channels have audio information recorded therein, and the R channel has control signals recorded therein. The control signal consisted of a 1 kHz sine wave recorded corresponding to the end of the audio.

The transmitter shown in FIG. 2 repeats the sequence of digital data transmission - voice information transmission - digital data transmission - old voice information transmission, and the operation in this case is as shown in the flowchart of FIG. 3. It will be done. (Al indicates the main routine, and when the power of the transmitter is turned on, the switching control terminal (f) of the input/output capo-1-6-4 is controlled by the CPU 6-3.
The signal becomes 'H', and this causes the cassette deck 1 to
is in a standby state, and processing other than alternate transmission of audio information and digital data is being performed. In this state, the selector switch 2-2 is switched to the MSK modulator 2-1 side.

Alternate transmission of audio information and digital data is carried out from the data input unit 7 via the input/output capotro 5 to the CPU 6.
This is done by interrupting -3. fbl
shows the routine in this case.

■First, when an interrupt occurs, the transmission start signal input terminal (hl
In step S1, it is checked whether or not star 1-1 has been indicated. A start instruction is issued by turning on the start switch 8 and detecting the rising edge of the input terminal (hl). By applying this to the cassette deck 1 via the pause control terminal fcl, the cassette deck 1 enters the standby state.

■When the signal RTS at the modulator control terminal (8) of the communication control LSr 6-1 becomes "H", it enters the transmission mode (step S2), thereby the modulator 2-3 enters the transmission state, and the communication control LSI 6 -1 output terminal (d
Transmission digital data TXrl is sent from + (step 33), and is transmitted to the narrowband FS via the MSK modulator 2-1.
The signal is converted into a K signal, applied to a modulator 2-3 via a selector switch 2-2, converted into, for example, an FM modulated wave, and transmitted via an antenna 2-4. In this case, the FSK signals used vary, for example, into 120011z and 1800 tlz, respectively, corresponding to the binary values of the digital signal. At this time, the transmission clock (TXC) generating section 6-2 supplies a lock necessary for the operation of the communication control l and S r 6-1. Furthermore, the communication control LSI 6-1 checks the transmission of the final data and continues transmitting digital data until it is detected.

(2) When the final data is transmitted (step S4), the output of the switching control terminal tf of the input/output coupler 4 is "I".

”, and as a result, the cassette deck 1 is released from standby, and the changeover switch 2-2 is switched to the cassette deck side to enter the audio transmission state (step S5), and the cassette deck 1 is output via the audio output terminal tb).
1, the audio information sent from the channel is applied to the modulator 2-3 via the changeover switch 2-2, converted into an FM modulated wave, and transmitted via the antenna 2-4.

■At the same time, the control signal detection circuit 3 connects the audio output terminal f
The output of the R channel of the cassette deck 1 which is output through the at is detected, and an output is generated according to the control signal recorded at the end of the audio information. Comparator 4 compares this output with a threshold of a certain level and produces an output when it exceeds this, thereby producing control signal detection output ill through inverter 5. Control signal detection output (11 is audio end detection signal input terminal (input/output via illusion)
The communication control LSI 6-1 detects the end of the audio information by the falling edge of the signal (step S6). As a result, the signal RTS at the modulator control terminal (81) becomes a [
-u, and the transmission is stopped (step 37). Since this start instruction information is held in the communication control LSI 6-], the above operations ① to ② will be repeated every time the control signal recorded in the cassette deck l is output until it is released. will be carried out.

〔Effect of the invention〕

As explained above, according to the transmitter of the present invention, when data is transmitted from the data transmitter and the final data is sent out, the cassette deck is activated to transmit audio information, and at the same time, it indicates the end of the audio information. When control information is detected,
Since the operation of putting the cassette deck in standby mode and transmitting data from the data transmitter again is performed repeatedly,
Digital data and audio information can be automatically switched and transmitted alternately by the same transmitter.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 is a diagram showing the configuration of an embodiment of the transmitter of the present invention, FIG. 3 is an operation flowchart of the transmitter shown in FIG. 2, FIG. 4 is a diagram for explaining the recording state of the cassette tape. l...-power sector deck, 2-transmission section, 2-1-MSK modulation section, 2-2--switch switch, 2-3-modulator, 2-4--antenna 3--control signal Detection circuit; 4-Comparator; ---
- Central control unit (CPU), 6-4. 6-5 - Individual output boat 7 - Data input section, 8 - Start switch Patent applicant: Fujitsu Ten Co., Ltd. Agent
Patent attorney Gobe Tamamushi (one other person) Diagram showing the principle structure of the present invention.

Claims (1)

[Scope of Claims] A cassette deck that records audio information on one channel and records a control signal in response to the end of the audio information on the other channel; and a data transmitter that sends out digital data; means for detecting a control signal from the cassette deck; when the control signal is detected, the cassette deck is placed in a standby state and the digital data from the data transmitter is transmitted; and when the final data is sent from the data transmitter, the cassette deck is activated. A transmitter characterized in that it performs control to release standby and transmit audio information, and alternately switches and transmits digital data and audio information.