JPH02166887A - Receiver - Google Patents

Abstract

PURPOSE:To undiscriminatingly receive a broadcasting signal in a different audio multiplex broadcasting system without providing a new manual switch by automatically switching a decoded signal in the different audio multiplex broadcasting system by discriminating an input signal and supplying the switched decoded signal to a selecting means. CONSTITUTION:When the input signal is the one in an FM audio multiplex system, a two-channel audio signal and/or a data signal are/is taken out from a decoder 9, and a four-level signal is taken out from the decoder 9. On the other hand, when the input signal is the one in a digital audio multiplex system, a two-channel audio signal and/or a data signal are/is taken out from a decoder 11, and a monaural audio signal is taken out from the decoder 9. At the same time, an information signal about the content of a digital multiplex signal is taken out from the decoder 11. On the other hand, when the input signal is not the multiplex audio signal, the monaural audio signal is taken out from the decoder 9. Further, the two-channel audio signals from the decoders 9 and 11 are supplied to a changeover switch circuit 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a receiving device used in an area where broadcast signals of different audio multiplexing systems coexist.

[Summary of the invention]

The present invention relates to a receiving device, in which when broadcast signals of different audio multiplexing systems are mixed, a means is provided for switching decoded signals of these audio multiplexing systems, and this switching is performed by determining the audio multiplexing system. This makes it possible to receive broadcast signals of each audio multiplexing system well.

[Conventional technology]

FM has traditionally been the audio multiplexing system for TV broadcasting.
A method based on multiplexing of audio signals is used.

In response to this, it is possible to set up a band separate from the conventional FM audio signal and transmit digital signals in this band, so that, for example, two-channel signals can be transmitted independently of the FM audio signal for TV broadcasting in some areas. was adopted.

[Problem to be solved by the invention]

In order to receive only the broadcast signals of these different types of audio multiplexing systems, it is sufficient to prepare a receiving device equipped with a corresponding audio multiplexing decoder.

However, in areas located at the border of areas where different types of broadcasting are being performed, these broadcast signals may be received together, and in that case, a device that allows these broadcast signals to be received in common is required. I was demanded to. Furthermore, in cases where people frequently travel between these regions, a device that can receive these broadcast signals in common is useful.

Therefore, a device was devised that incorporates decoders for both of these broadcasting systems and receives them by switching. However, the provision of a new manual switch etc. for such switching requires the configuration to be 'I1. This is undesirable because it becomes complicated and the user's operation becomes complicated.

This application was filed in view of these points.

[Means for Solving the Problems] The present invention provides a broadcast signal of a first audio multiplexing method (digital audio multiplexing method) in which at least two channels of audio signals are multiplexed independently of existing audio signals; In a receiving device capable of receiving a broadcast signal of a second audio multiplexing method (FM audio multiplexing method) that multiplexes an existing audio signal into at least two channels of audio signals, the first and second audio multiplexing methods described above. Switching means (switch (1)
2>) is provided, and the control of this switching means is determined from the received signal of the broadcast signal (interface circuit (13)).
The signal from the switching means is supplied to a selection means (audio processor (14)) which arbitrarily selects and extracts the audio signals of the two channels, and the control of this selection means is performed according to the broadcast signal. This is a receiving device characterized in that the determination is made based on a discrimination signal (four-level signal/control data) from a received signal.

[Effect]

According to this, the decoded signals of different types of audio multiplexing systems are automatically switched by distinguishing the received signals, and the switched signals are supplied to the selection means, thereby making it possible to provide a new manual switch, etc. Furthermore, the user can successfully receive broadcast signals of different audio multiplexing systems without distinguishing between them, simply by performing the same operations as with conventional audio multiplexing receiving devices.

〔Example〕

In FIG. 1, a signal from an antenna (1) is supplied to a tuner (2) and a desired broadcast signal is tuned and received.

Here, this received signal includes, for example, 3B, 9. A video signal whose carrier frequency is MHz, 33. 33.16 when the broadcast signal is an FM audio multiplex system together with an audio signal whose transmission frequency is Ul) Iz! , 33.053! if the FM multiplex signal or broadcast signal with a carrier frequency of 1flz is a digital audio multiplex system! Each includes a digital multiplex signal with a carrier frequency of Hz.

This received signal is supplied to, for example, a surface wave filter (3) to separate a video signal, and this video signal is sent to a VIF circuit (4).
) is taken out to the output terminal (5).

On the other hand, the signal from the filter (3) is supplied to a frequency conversion circuit (6) which extracts the frequency component of the difference between the carrier signal of each audio signal and multiplexed signal and the carrier signal of the video signal. The signal from this circuit (6) is supplied to a bandpass filter (7) that extracts the band corresponding to the converted audio signal and FM multiplexed signal, and the extracted signal is passed through the SIF circuit (8) to the FM audio multiplexing system. decoder (9). In addition, a band pass filter (10) extracts a band corresponding to the digital multiplexed signal obtained by converting the signal from the circuit (6).
The extracted signal is supplied to a digital audio multiplexing decoder (11).

As a result, if the received signal is in the FM audio multiplex system,
Two channels of audio and/or data signals are taken out from the decoder (9). At the same time, if the 2-channel audio signal decoded is stereo, for example, 6V
3V for 12-duplex audio.

In the case of monaural, a so-called 4-level signal, which is OV, is extracted. In addition, in the FM audio multiplexing system, the signals that are multiplexed into two channels include stereo audio, double audio, and one channel is audio and the other is a data signal mode. Among these, one channel is a data signal mode. The data signal is output to the data bus, and the audio signal is monaural and a signal equivalent to two channels is extracted.

On the other hand, when the received signal is of the digital audio multiplex system, two channels of audio signals and/or data signals are extracted from the decoder (11), and at the same time, the decoder (9)
) is extracted from the monaural audio signal. At the same time, an information signal regarding the content of the digital multiplex signal is extracted from the decoder (11).

In this case, in the digital audio multiplexing system, the signals that are multiplexed into two channels include stereo audio, dual audio, one channel is audio and the other is a data signal, and both channels are data signals. In the mode where 1 channel is a data signal, the data signal is output to the data bus, and the audio signal is monaural and 2
A signal equal to the channel is taken. Furthermore, in the data signal mode for both channels, these data signals are output to the data bus, and the audio signals are muted. In this mode, the audio signal is sent to the decoder (9
), and a signal equal to two channels is extracted.

Further, if the received signal is not an audio multiplex signal, a monaural audio signal is extracted from the decoder (9), and the
A four-level signal of V is taken out.

Furthermore, two-channel audio signals from the decoders (9) and (11) are supplied to a changeover switch circuit (12). Further, the information signal from the decoder (11) is supplied to the interface circuit (13), and a signal corresponding to the above-mentioned four-level signal and a signal indicating that the audio signal has been decoded by the decoder (11) are formed. . A signal corresponding to this 4-level signal and a 04-level signal from the decoder (9) are supplied to the changeover switch circuit (12), and this switching is controlled by a signal indicating that the audio signal is being decoded, and the above-mentioned When the audio signal is switched to OV of a signal corresponding to a 4-level signal, the decoder (9) is controlled to become (II!I).

Two-channel audio signals and four-level signals or signals equivalent thereto are supplied from the changeover switch circuit (12) to an audio processor (14).

On the other hand, a signal regarding the content of the digital multiplex signal from the interface circuit (13) is supplied to the controller (15). Further, (16) is a light receiving unit for remote control signals, and the signal from this light receiving unit (16) is supplied to a decoder (17) to extract each control signal. is the controller
15). This allows the controller (I5
), control data to be described later is formed, and this control B data is supplied to the audio processor (i4).

Then, in this audio processor (14), the 2-channel audio signal from the changeover switch (12) is selected according to the above-mentioned 4-level signal or its equivalent signal and control data, and is output to the output terminals (18L) (18R). be done.

That is, first, when the 4-level signal or the signal equivalent to it is 6V (stereo) or OV (monaural), the 2-channel audio signal from the changeover switch (12) is taken out as it is to the output terminal (181) (18R). .

Further, when the signal is 3V, two channel signals are selected according to control data from the controller (15).

Here, the control data from the controller (15) is first transmitted from the decoder (17) when the received signal is of the FM audio multiplex system (when the signal from the interface circuit (13) is all "0") The control data is double-inverted to one side or the other for each trigger (trigger), and two-channel signals from the decoder (9) are alternately taken out to the output terminals (18L) (18R).

On the other hand, when the received signal is of the digital audio multiplex system, the mode of the multiplexed signal is determined by the signal from the interface circuit (13), and control data is formed according to this mode.

In other words, in the stereo audio mode, each trigger described above is used as control data to bi-invert to stereo (control data output is not required) or forced FM (described later), and in the dual audio mode, one trigger, the other, or forced FM is used for each trigger. FM is used as circulating control data, and when one channel is in data signal mode, each bird is bi-inverted to monaural (control data output is not required) or forced FM, and when both channels are in data signal mode, It is continuously used as control data for forced FM.

As a result, in the dual audio mode, two channels of audio signals are sequentially taken out to the output terminals (18L) (18R), and when the above-mentioned forced FM control data is supplied, the audio signals in the audio processor (14) are output. The signal selection means is set to a monaural state, and the terminal to which the 4-level signal is supplied is set to Ov. Therefore, this OV lowers the potential of the signal corresponding to 4 levels from the interface circuit (13) to QV through the changeover switch (12), and thereby the changeover switch (12) switches the audio signal to the decoder (9) side. It is said that

That is, in this case, if the received signal is of the FM audio multiplexing system, two-channel audio signals are alternately output each time the user operates the remote control in the dual audio mode. In addition, if the received signal is a digital audio multiplex system, each time the user operates the remote control in dual audio mode, the 2-channel audio signal from the decoder (11) and the audio signal from the decoder (9) are transmitted. In the mode where stereo audio and one channel is a data signal, the decoder (11) or (9)
The audio signals from the decoder (9) are output alternately, and when both channels are in the data signal mode, the audio signals from the decoder (9) are output.

Further, in the above-mentioned apparatus, a signal indicating that the audio signal is being decoded by the decoder (11) is formed in the controller (15), and this signal indicates that a broadcast signal of the digital audio multiplexing system is being received. It is taken out to a terminal (19) connected to the first display LED. Furthermore, in the audio processor (14), the controller (I
5) Output terminal (18L) according to control data etc. from
A terminal (2OA) where a signal indicating the channel of the audio signal being taken out is formed at (18R) and connected to the second and third display LEDs corresponding to each channel.
(20B). When the 4-level signal is OV and forced FM control data, the terminal (2OA) <20
The signal 8) is used to turn off the LED.

As a result, the lighting (◯) and non-lighting (·) of the first to third display LEDs connected to the terminals (19) (2OA) (20B) become as shown in Table 1 below.

Table 1 Thus, according to the above-mentioned device, a decoded signal of a different type of audio multiplexing system is distinguished from a received signal, the signal is automatically switched, and this switched signal is supplied to the selection means. There is no need to install a switch, and the user only has to operate it in the same way as a conventional audio multiplex receiver.
It is possible to successfully receive different types of audio multi-grain broadcast signals without distinguishing between them.

In the above-described apparatus, the information signal from the decoder (11) may include, for example, a signal indicating the presence of stereo audio (
a), a signal indicating the presence of one voice (C), a signal indicating the presence of the other voice (C), a signal indicating that the digital voice and FM voice are of equal content (d), and a decoder (11). A signal (e) indicating that decoding is not performed normally is output.

Therefore, from these signals (a) to (e), a signal corresponding to the above-mentioned four-level signal, a signal (QX) indicating that the audio signal has been decoded by the decoder (11), and the operation of the controller (15) are obtained. The signal required for (Qo.

Ql, Q2) for forming the interface circuit (
13) is configured as shown in FIG. 2, for example.

In the figure, signal (a) is supplied to an AND circuit (31), and this AND output and signal (e) are supplied to an OR circuit (31).
2), this OR output is supplied to the base of a transistor (34) via an inverter (33), and a signal (QX) is taken out from the collector of this transistor (34).

For signals corresponding to 4-level signals, for example, resistors (35) (36) with a resistance equal to 22Ω are connected between the +12V power supply and ground.
is connected to the potential of 6V, and the signal (
a) is supplied to the base of the transistor (37), and is grounded to the transistor (37) and 15 through the resistor (38) of Ω, so that the potential is 3V when the transistor (37) is on, and the inverter ( The output signal of 33) is supplied to the base of a transistor (40) via an inverter (39) and grounded via this transistor (40), so that the potential is QV when the transistor (40) is on.

Furthermore, the signals (a) and (C) are supplied to an AND circuit (41), and the output signals of this AND output and OR circuit 32) are supplied to an AND circuit (44) via inverters (42) and (43), respectively. A signal (Qo) is taken out from this AND circuit (44). Further, the signal (C) and the output signal of the inverter (43) are supplied to an AND circuit (45), and a signal (Ql) is taken out from this AND circuit (45). Note that the signal (d) is taken out as is as the signal (Q2).

As a result, the signals shown in Table 2 below are taken out from this interface circuit (13) according to each mode. Although the signal (d)=((L) is omitted in the table, it is "0" or "1" in all modes.

By distinguishing the single-mode signal from the received signal and automatically switching the signal, and supplying this switched signal to the selection means, there is no need to install a new manual switch, and the user can use the conventional audio multiplexing method. It is now possible to successfully receive broadcast signals of different types of audio multiplexing systems without distinguishing between them, just by operating the same way as with a receiving device.

[Brief explanation of the drawing]

FIG. 1 shows the configuration of an example of the present invention, and FIG. 2 is a diagram for explaining the same. (9) (11) is a decoder, (12) is a changeover switch circuit, (13) is an interface circuit, (14) is an audio processor, (15) is a controller, (18)
L) (18R) (19) (2OA) (20B) are output terminals. Table 2 This allows for good reception. [Effects of the Invention] According to the present invention, a deco agent for different types of audio multiplexing systems.

Claims (1)

[Claims] A broadcast signal of a first audio multiplexing system in which at least two channels of audio signals are multiplexed independently of the existing audio signal; A receiving device capable of receiving a broadcast signal of a second audio multiplexing system to be multiplexed is provided with switching means for switching the decoded signals of the first and second audio multiplexing systems, and the control of this switching means is controlled by the broadcast signal of the second audio multiplexing system. The signal from the switching means is supplied to a selection means for arbitrarily selecting and extracting the two channels of audio signals, and the control of this selection means controls the selection of the broadcast signal. A receiving device characterized in that the determination is made based on a discrimination signal from a received signal.