JPH04311172A - Satellite broadcasting receiver - Google Patents

Abstract

PURPOSE:To automatically switch NTSC type satellite broadcasting(SBC) recording/reproducing and MUSE type SBC recording/reproducing only by the operation of a channel selection part. CONSTITUTION:An MUSE discriminating mens 38 forms a discriminating signal (a) indicating whether MUSE type SBC is received or not based upon an AFC signal inputted from an MUSE-NTSC converter 48 and suplies the signal (a) to a selection means 50. Based upon the signal (a), the means 50 generates the 1st selection signal (c) when the received SBC is the NTSC type or generates the 2nd selection signal (c) in the case of the MUSE type and supplies the generated selection signal (c) to switching means 45 to 47. The means 45 to 47 automatically select either one combination, the 1st video and voice signals reproduced from the NTSC type SBC or the 2nd video and voice signals NTSC- converted by a converter 48.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a BS for receiving satellite broadcasting.
(Broadcasting Satellite)
VTR with built-in tuner (Video Tape R)
The present invention relates to satellite broadcast receiving equipment such as echocorder and TV (television).

0002

[Prior Art] For example, satellite broadcasting using the NTSC system uses HD
TV (High-Definition Television)
MUSE (Multiple Sub-N)
yquist Sampling Encoding)
It has been in widespread use even before experimental broadcasting using this method began, and is already being received by a considerable number of households. Therefore, M.U.
In order to enable SE system satellite broadcasting to be received by NTSC system receiving equipment, a MUSE-NTSC converter that converts the number of scanning lines and aspect ratio has been developed.

FIG. 2 is a schematic block diagram of a signal processing system in a VTR with a built-in BS tuner. MUSE-
The NTSC converter 18 is connected as an external device to the VTR.

Satellite broadcast radio waves in the 12 GHz band, for example, intercepted by the external BS antenna 1 are frequency-converted into BS-IF signals in the 1 GHz band, for example, so that they can be easily transmitted by the receiving system. After the BS-IF signal is amplified to the required level by BS antenna 1, it is sent to BS tuner 2 of the VTR.
is input. In the BS tuner 2, a desired BS channel is selected by operating the channel selection section 3. Furthermore, the baseband signal extracted after FM demodulation is inputted from the BS tuner 2 to the buffer amplifier 4, the video signal processing section 5, and the demodulation section 6, respectively.

The output of the buffer amplifier 4 is connected to the external output terminal 1.
1, and the baseband signal is input to the external MUSE-NTSC converter 18 as a detection output. In addition, the AFC (Automatic Frequency Co., Ltd.) output from the MUSE-NTSC converter 18
ntrol) signal is sent to MUSE via external input terminal 12.
The signal is input to the determination circuit 8. The MUSE determination circuit 8
Based on the C signal, the MUSE judgment signal is sent to the AFC switching circuit 2.
Supply to 2. The AFC switching circuit 22 changes the AFC in the BS tuner 2 when receiving NTSC satellite broadcasting and when receiving MUSE satellite broadcasting.
Switch the operation.

The output of the video signal reproduced from the baseband signal by the video signal processing section 5 is connected to a terminal 19a of the changeover switch 19. Furthermore, the outputs of the left and right audio signals reproduced by the audio processing section 7 are connected to a terminal 20a of a changeover switch 20 and a terminal 21a of a changeover switch 21, respectively.

On the other hand, the MUSE-NTSC converter 18
The video signal converted to NTSC and the reproduced left and right audio signals are sent to the terminal 19b of the changeover switch 19, the terminal 20b of the changeover switch 20, and the changeover switch 2 via the external input terminals 13, 14L, and 14R.
1 terminal 21b, respectively. In addition, the common terminals 19c and 2 of the changeover switches 19, 20, and 21
0c・21c is E-E (Electric to E
via an electric) circuit (not shown).
Each is connected to a recording unit (not shown).

[0008] MUSE-NTSC converter 18
When connected externally to R as described above, MUSE satellite broadcasting can be monitored and recorded by the following operations. In other words, the channel selection section 3
Receive MUSE satellite broadcasting by operating the button and selecting the desired BS channel, then press the switch 1.
9, 20, and 21 on the external input mode side, that is, terminal 19
Manually switch to b/20b/21b side. This allows NTSC-converted MUSE format satellite broadcasting to
The signal is supplied to the recording section via the -E circuit.

[0009]

[Problem to be Solved by the Invention] However, with the above conventional configuration, when the selection is changed from the BS channel of NTSC satellite broadcasting to the BS channel of MUSE satellite broadcasting, or vice versa, , it is necessary to change over the changeover switches 19, 20, and 21 each time, resulting in a problem that the operation becomes complicated.

0010

[Means for Solving the Problems] In order to solve the above problems, a satellite broadcasting receiving device according to the present invention receives NTSC satellite broadcasting and reproduces a first video signal and a first audio signal. , the FM detection signal of the MUSE system satellite broadcasting is output from the external output terminal to the external MUSE-NTSC converter, and the MUSE-NTSC converter converts the MUSE system to the NTSC system and reproduces the second video signal and the reproduced second video signal. The second audio signal is input from the external input terminal, and the frequency control in the tuning section is automatically switched based on the automatic frequency control signal input from the external input terminal.

Furthermore, the satellite broadcast receiving device according to the present invention is characterized in that it includes at least the following means. That is, (1) a switching means (for example, a changeover switch) for selecting one of the combinations of the first video signal and the first audio signal and the second video signal and the second audio signal; (2) the automatic frequency control. MUSE determination means (for example, a MUSE determination circuit) that receives a signal and generates a determination signal indicating whether MUSE satellite broadcasting is being received; (3) determination indicating that NTSC satellite broadcasting is being received; When the signal is input, a first selection signal for automatically selecting the first video signal and the first audio signal is generated and supplied to the switching means, and the MUSE satellite broadcasting is received. when a determination signal indicating that the second video signal and the second audio signal are present is inputted, a selection means (
For example, an AND circuit).

0012

[Operation] According to the above configuration, when the MUSE determination means generates a determination signal indicating that NTSC satellite broadcasting is being received based on the input automatic frequency control signal, the selection means A first selection signal is generated based on the signal and supplied to the switching means. As a result, the switching means automatically selects the first video signal and the first audio signal that have been received and reproduced from NTSC satellite broadcasting.

On the other hand, when the MUSE determination means generates a determination signal indicating that MUSE satellite broadcasting is being received based on the input automatic frequency control signal, the selection means selects the first determination signal based on the determination signal. 2 selection signal is generated and supplied to the switching means. As a result, the switching means uses the MUSE-NTSC converter to
The second version was converted from the SE system to the NTSC system and played back.
The video signal and the reproduced second audio signal are automatically selected.

[0014] That is, depending on whether the satellite broadcasting selected by the channel selection section is the NTSC system or the MUSE system, the first video signal and the first audio signal, and the second video signal and the second audio signal are automatically Switch.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the satellite broadcast receiving device according to the present invention, a VTR with a built-in BS tuner will be described below with reference to FIG.

A BS antenna 31 and a MUSE-NTSC converter 48 are provided outside the VTR of this embodiment. The BS antenna 31 intercepts satellite broadcast radio waves in, for example, a 12 GHz band, and converts the frequency into a BS-IF signal in, for example, a 1 GHz band so that it can be easily transmitted by a receiving system. Further, the MUSE-NTSC converter 48
In order to enable satellite broadcasting of the USE system to be received by a receiving device of the NTSC system, the number of scanning lines and aspect ratio are converted.

The configuration of the VTR will be explained below. V above
The TR has a built-in BS tuner 32. BS above
- The IF signal is transmitted from the BS antenna 31 to the BS tuner 32
supplied to The BS tuner 32 also has a desired B.
The output of a channel selection section 33 for selecting the S channel is connected. Thereby, the BS tuner 32 performs FM demodulation on the BS-IF signal of the BS channel selected by the channel selection section 33 and extracts the baseband signal.

The output of the BS tuner 32 is sent to a buffer amplifier 34 that buffers and amplifies the baseband signal, a video signal processing unit 35 that reproduces a video signal from the baseband signal, and a bitstream that demodulates the audio signal component from the baseband signal. Each is connected to a demodulator 36 that outputs a signal. Further, the output of the demodulation section 36 is connected to an audio processing section 37 that reproduces an audio signal from the bit stream signal.

Output of video signal processing unit 35 and audio processing unit 3
The left and right audio outputs of 7 are the terminals 45a, 46a, 4 of the changeover switches 45, 46, 47 as switching means.
7a, respectively. On the other hand, the other terminals 45b, 46b, of the changeover switches 45, 46, 47
47b is connected to an external input terminal 43 to which a video signal is input from the outside, and to external input terminals 44L and 44R to which left and right audio signals are input from the outside.

The output of the buffer amplifier 34 is connected to an external output terminal 41. From the external output terminal 41 to the external device (in this embodiment, the MUSE-NTSC converter 48
), the baseband signal is supplied as a detection output. Furthermore, a MUSE determination circuit 38 is connected to the external input terminal 42 to which the AFC pulse is input. The MUSE determination circuit 38 receives A supplied via an external input terminal 42.
Based on the FC pulse, it is determined whether NTSC satellite broadcasting or MUSE satellite broadcasting is being received, and a MUSE determination signal a is output. In addition,
The MUSE determination signal a becomes high level when receiving MUSE satellite broadcasting.

The output of the MUSE determination circuit 38 is connected to an AFC switching circuit 52 on the one hand. The AFC switching circuit 52 switches the AFC operation in the BS tuner 32 when receiving NTSC satellite broadcasting and when receiving MUSE satellite broadcasting.

The output of the MUSE determination circuit 38 is also output from the AN, which is an important component of the present invention, as selection means.
It is connected to one input terminal of the D circuit 50. Further, the other input terminal of the AND circuit 50 is inputted with a BS reception mode signal b which becomes high level only when receiving satellite broadcasting. The selection signal c as the output of the AND circuit 50 is supplied to the changeover switches 45, 46, and 47, respectively. Changeover switch 45・
46 and 47 are terminals 45a and 4 based on the selection signal c.
It is designed to switch between the terminals 6a and 47a and the terminals 45b, 46b and 47b. In addition, selector switch 1
The common terminals 45c, 46c, and 47c of 5, 16, and 17 are connected to the recording section (
(not shown).

In the above configuration, the satellite broadcast radio waves intercepted by the external BS antenna 31 are converted into BS-IF signals and then input to the BS tuner 32 of the VTR. Then, the BS selected by the channel selection section 33
The baseband signal extracted by FM demodulation from the BS-IF signal of the channel is input to the buffer amplifier 34, the video signal processing section 35, and the demodulation section 36, respectively.

In the video signal processing section 35, the video signal is separated from the baseband signal using an LPF (low pass filter) or the like. Thereafter, the video signal is de-emphasized, amplified, and output from the video signal processing section 35.

[0025] Furthermore, the audio processing unit 37 converts the bit stream signal demodulated by the demodulation unit 36 into PCM (Pulse
Code Modulation) demodulation and further D/
By performing A (digital/analog) conversion, left and right audio signals are generated and output.

Here, if the BS channel selected by the channel selection unit 33 is a MUSE system satellite broadcast, the baseband signal buffered and amplified by the buffer amplifier 34 is sent from the external output terminal 41 to the MUSE-NTSC converter 48. Output as detection output. MUSE-N
The TSC converter 48 outputs the video signal converted from the MUSE system to the NTSC system and the reproduced left and right audio signals to external input terminals 43, 44L, and 44R, respectively. Moreover, the MUSE-NTSC converter 48 is
Generates an AFC pulse and inputs it to the MU via the external input terminal 42.
The signal is supplied to the SE determination circuit 38.

The MUSE determination circuit 38 determines whether the supplied AF
Based on the C pulse, a MUSE determination signal a is output which becomes high level when receiving MUSE satellite broadcasting and becomes low level when receiving NTSC satellite broadcasting. M
The USE determination signal a is the AFC switching circuit 52 and the AND
Each is input to one input terminal of the circuit 50. B.S.
The AFC operation in the tuner 32 is switched by the AFC switching circuit 52 based on the MUSE determination signal a.

[0028] When MUSE system satellite broadcasting is received,
High level MUSE judgment signal a and high level B
The S reception mode signal b is supplied to each input terminal of the AND circuit 50. Therefore, the AND circuit 50 outputs the high-level selection signal c as the second selection signal to the changeover switches 45, 46, and 47. Based on this high level selection signal c, each changeover switch 45, 46, 47
are automatically switched to the respective terminals 45b, 46b, and 47b, and connected to external input terminals 43, 44L, and 44R, respectively. This allows the MUSE-NTS of the external device to
The video signal NTSC-converted by the C converter 48 and the reproduced left and right audio signals are input to the recording section via the E-E circuit.

On the other hand, if the BS channel selected by the channel selection section 33 is an NTSC satellite broadcast, the low level MUSE determination signal a and the high level BS reception mode signal b are input to each input terminal of the AND circuit 50. Supplied. Therefore, the AND circuit 50 outputs the low level selection signal c as the first selection signal to the changeover switches 45, 46, and 47. Based on this low level selection signal c, each selector switch 45, 46, 4
7 is automatically switched to each terminal 45a, 46a, 47a side, and connected to each output of the video signal processing section 35 and the audio processing section 37. As a result, the NTSC satellite broadcast video signal generated in the VTR and the reproduced left and right audio signals are input to the recording section via the E-E circuit.

[0030] In addition to the changeover switches 45, 46, and 47 described above, the VTR according to the present invention may also include a changeover switch that automatically switches between recording of terrestrial broadcasting such as VHF broadcasting and recording of satellite broadcasting. can. Also in this case, the selection signal c output by the AND circuit 50 is supplied to a changeover switch (not shown). When terrestrial broadcasting is received, the low level MUSE determination signal a and the low level BS reception mode signal b are output to the AND circuit 50.
is supplied to each input terminal of Therefore, AND circuit 5
Based on the low level selection signal c output by the terminal 0, the changeover switch can be switched to the terrestrial broadcasting video signal and audio signal side.

As described above, in the VTR according to the present invention,
Just select the channel and press the changeover switch 45.
46 and 47 and changeover switches (not shown) are automatically switched, and MUSE satellite broadcasting, NTSC satellite broadcasting, and terrestrial broadcasting can be monitored and recorded.

[0032] As the changeover switch, for example, a relay or a semiconductor switch can be used, but the specific form thereof is not limited. Furthermore, the MUSE determination signal a can also be directly used as the selection signal c. Furthermore, as a satellite broadcast receiving device of the present invention, a VT with built-in BS tuner
Although R was taken as an example, the present invention is not limited to this, and the present invention can also be applied to a TV with a built-in BS tuner.

[0033]

As described above, the satellite broadcasting receiving device according to the present invention transmits at least one combination of the first video signal and the first audio signal and the second video signal and the second audio signal. a switching means for selecting and a MUSE that inputs the automatic frequency control signal and generates a determination signal indicating whether or not satellite broadcasting of the MUSE system is being received;
When a determination means and a determination signal indicating that NTSC satellite broadcasting is being received are input, a first selection signal is generated for automatically selecting the first video signal and the first audio signal. and supply it to the switching means, MUSE
When a determination signal indicating that a satellite broadcasting system is being received is input, the switching means generates a second selection signal for automatically selecting the second video signal and the second audio signal. This configuration includes a selection means for supplying the information to the user.

[0034] Therefore, the satellite broadcast receiving device according to the present invention determines whether the satellite broadcast selected by the channel selection section is based on the NTSC system or the MU system.
This has the effect that the first video signal and the first audio signal, and the second video signal and the second audio signal can be automatically switched depending on the SE method.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, and is a schematic block diagram of a signal processing system of a VTR with a built-in BS tuner.

FIG. 2 shows a conventional example, and is a schematic block diagram of a signal processing system of a VTR with a built-in BS tuner.

[Explanation of symbols]

38 MUSE judgment circuit (MUSE judgment means) 4
5 Changeover switch (switching means) 46
Changeover switch (switching means) 47 Changeover switch (switching means) 48 MUSE
-NTSC converter 50 AND circuit (selection means)

Claims (1)

[Claims] Claim 1: Receiving NTSC satellite broadcasting and reproducing the first video signal and first audio signal, while outputting the FM detection signal of the MUSE satellite broadcasting from an external output terminal to an external MUSE-NTSC converter. MUSE-N
The second video signal converted from the MUSE system to the NTSC system by the TSC converter and the reproduced second audio signal are input from the external input terminal, and selection is made based on the automatic frequency control signal input from the external input terminal. In a satellite broadcast receiving device that automatically switches frequency control in a local area, a switching means for selecting one of the combinations of the first video signal and the first audio signal and the second video signal and the second audio signal; When an automatic frequency control signal is input to generate a determination signal indicating whether MUSE satellite broadcasting is being received, and a determination signal indicating that NTSC satellite broadcasting is being received is input. A first selection signal for automatically selecting the first video signal and the first audio signal is generated and supplied to the switching means, and a determination indicating that MUSE satellite broadcasting is being received. and selecting means for automatically selecting the second video signal and the second audio signal when the signal is input, and supplying the generated second selection signal to the switching means. Satellite broadcast receiving equipment.