JPH09205619A - Television broadcast system and recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the recording and reproducing circuit base on a control signal superimposed on a sound signal extracted from the sound signal. SOLUTION: A signal received by a reception antenna 11 is fed to a tuner 12. The tuner 12 demodulates the received signal and the demodulated television signal is fed to a recording and reproducing circuit 14. Simultaneously a sound signal is fed to a program information signal extract circuit 13 from the tuner 12. The program information signal extract circuit 13 extracts a program information signal from the sound signal and the program information signal is fed to a recording/reproduction control circuit 15, in which the recording and reproducing circuit 14 is controlled based on the program information signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television broadcasting system and a recording / reproducing apparatus capable of accurately starting reserved recording by, for example, confirming the beginning of the program during reserved recording.

[0002]

2. Description of the Related Art Conventionally, in television broadcasting in which a signal other than voice is placed on an audio signal portion and transmitted, this signal has not been used for the purpose of controlling a recording / reproducing circuit. That is, there has been no device that performs accurate reservation recording using a signal carried on an audio signal.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to realize a recording / reproducing apparatus controllable by a program information signal in television broadcasting in which the program information signal is carried on an audio signal for broadcasting. It is to provide accurate recording or reservation recording by transmitting and receiving a program start instruction code or a program recognition code as a program information signal.

[0004]

According to a first aspect of the present invention, a television broadcast is characterized in that a program information signal is placed on an audio signal so that the television signal can be transmitted and received and the program information signal can be transmitted and received at the same time. System.

According to a second aspect of the invention, in a system for receiving a television signal in which a program information signal is carried on an audio signal, a receiving means for receiving the television signal and the program information signal from the audio signal are received. A television recording / reproducing apparatus comprising a program information signal extracting means for extracting and an output means for outputting the extracted program information signal.

A program information signal is extracted from a television broadcast containing an audio signal carrying a program information signal, and the recording / reproducing circuit is controlled based on this program information signal. Further, the recording / reproducing circuit is controlled by comparing the extracted program information signal with the program recognition code.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, in this embodiment, a signal indicating the contents of a broadcast program or a signal for controlling a device that handles this signal is generically called a program information signal. For example, a signal indicating the beginning or the end of this broadcast program, any signal including information accompanying this program, a control signal for a device connected to the receiving device, the recording / reproducing device, and the like are included in this.

FIG. 1 shows an embodiment of a television recording / reproducing apparatus according to the present invention. That is, in television broadcasting in which a program information signal is placed on an audio signal for broadcasting,
It is a television recording / reproducing apparatus that can be controlled by these signals. The signal received by the receiving antenna 11 is supplied to the tuner 12. The tuner 12 demodulates the received signal, and the demodulated television signal is supplied to the recording / reproducing circuit 14.

At this time, only the audio signal is supplied from the tuner 12 to the program information signal extraction circuit 13 as well. The program information signal extraction circuit 13 extracts the program information signal from the supplied audio signal. The extracted program information signal is supplied from the program information signal extraction circuit 13 to the recording / reproduction / control circuit 15. The recording / reproduction / control circuit 15 controls the recording / reproduction circuit 14 based on the supplied program information signal. That is, the recording / reproducing circuit 14 records or reproduces a television signal.

It is obvious that the control signal inserted in this audio signal may be any signal as long as it can be transmitted as an audio signal. However, in the present invention, since the audio signal is used as the transmission medium of the program information signal, the viewer can hear the signal sound. Therefore, it is preferable to use an audio signal that does not give the viewer a feeling of strangeness. In the following embodiment, a push tone signal is used as described later.

Next, another embodiment of the television recording / reproducing apparatus according to the present invention is shown in FIG. In FIG. 2, in a television broadcast in which a program start instruction code is placed as a program information signal on a sub-audio signal of a television audio multiplex broadcast, reserved recording is started by the program start instruction code. The program disclosure instruction code is a mark signal indicating the start of the broadcast program.

The signal received by the receiving antenna 21 is supplied to the tuner 22. The tuner 22 demodulates the supplied signal, and the demodulated television signal is supplied to the recording / reproducing circuit 24. At the same time, the tuner 22 is provided with a decoder for audio multiplex broadcasting, and the sub audio signal is supplied from the tuner 22 to the program information signal extraction circuit 23. The program information signal extraction circuit 23 extracts a program start instruction code from the supplied sub audio signal, and supplies the extracted program start instruction code to the reserved recording start control circuit 25. In the reserved recording start control circuit 25, the control signal based on the supplied program start instruction code is used as the recording / reproducing circuit 24.
Supplied to In the recording / reproducing circuit 24, recording is started in response to the supplied control signal.

In the reserved recording, there is a case where the program to be reserved and recorded cannot be accurately reserved due to a clock error built in the recording / reproducing apparatus or a delay in the actual broadcast start time. However, in this other embodiment, the detection of the program start instruction code is started one minute before the reserved recording, and the recording is started as soon as it is detected.
Alternatively, the delay of the actual broadcast start time is absorbed, and accurate reservation recording can be performed.

Since the audio signal is used as a transmission medium for the program information signal, the viewer can hear the audio signal. However, in other embodiments, the control signal is carried in the secondary audio signal. In a general bilingual broadcast reception tuner, since the main audio signal is preferentially output, it is advantageous that the control signal is included in the sub audio signal so that the viewer is less likely to hear.

As an example of a voice signal used in the above-described embodiment and other embodiments, a push tone signal used in a push line telephone will be described. FIG. 3 is a diagram showing the relationship between the telephone key matrix and the standard frequency. In this way, which key is selected is determined by combining signals of two frequencies for one key. For example, when 1 is pressed, 1209 [Hz] and 6
When 97 [Hz] is output and 2 is pressed, 1336 [Hz]
And 697 [Hz] are output and when 3 is pressed, 1477
When [Hz] and 697 [Hz] are output and A is pressed, 16
33 [Hz] and 697 [Hz] are output. When 4 is pressed, 1209 [Hz] and 770 [Hz] are output, and when 5 is pressed, 1336 [Hz] and 770 [Hz] are output, and 6
When is pressed, 1477 [Hz] and 770 [Hz] are output, and when B is pressed, 1633 [Hz] and 770 [Hz] are output.

Similarly, when 7 is pressed, 1209 [Hz]
And 852 [Hz] are output, and when 8 is pressed, 1336
When [Hz] and 852 [Hz] are output and 9 is pressed, 14
When 77 [Hz] and 852 [Hz] are output and C is pressed,
1633 [Hz] and 852 [Hz] are output. When * is pressed, 1209 [Hz] and 941 [Hz] are output,
When 0 is pressed, 1336 [Hz] and 941 [Hz] are output, when # is pressed, 1477 [Hz] and 941 [Hz] are output, and when D is pressed, 1633 [Hz] ] And 941 [Hz]
Is output.

In order to extract these signals, specific frequencies (697 [Hz], 770 [Hz], 852) are extracted from the audio signal.
[Hz], 941 [Hz], 1209 [Hz], 1336 [Hz], 14
Any method capable of detecting the presence / absence of 77 [Hz], 1633 [Hz]) may be used, but a tone decoding IC described later is used here as an example.

Here, a detailed block diagram of an example of the program information signal extraction circuit 23 is shown in FIG. The sub audio signal is supplied from the input terminal 31. The sub audio signal responds to 697 [Hz], 697 [Hz] extraction circuit 32, 770 [Hz], responds to 770 [Hz] extraction circuit 33, 852 [Hz], 852
[Hz] extracting circuit 34, 941 [Hz] extracting circuit 35, responding to 1209 [Hz] 1209 [Hz] extracting circuit 36, 1336 [Hz] extracting circuit responding to 1336 [Hz] 37, 1477 [Hz] extraction circuit 38 responsive to 1477 [Hz] and 1633 [Hz] extraction circuit 39 responsive to 1633 [Hz].

As an example, as shown in FIG. 5A, 697
When the sub audio signal of [Hz] is supplied from the input terminal 31,
In the 697 [Hz] extraction circuit 32, as shown in FIG.
When a 7 [Hz] audio signal exists, `0` is output, and when this signal does not exist,` 1` is output. The output signal is supplied from the 697 [Hz] extraction circuit 32 to the microcomputer 40.

Therefore, it is understood that 16 kinds of signals can be discriminated by preparing the tone decoder circuits for extracting the above-mentioned eight frequencies and observing the combinations of these outputs.

In this way, the extraction circuits 32 to 39 determine whether or not there is a signal of a predetermined frequency. If a signal of that frequency is present, `0` is output, If the signal does not exist, `1 'is output. Each output is supplied to the microcomputer 40.
In the microcomputer 40, 16 signals can be discriminated from the presence or absence of these 8 signals.

In the microcomputer 40, `
An output signal of 1'or '0' is supplied, and the 16 output signals described above are discriminated. This supplied signal is the same as 4-bit information transmission, and it is clear that considerable information transmission is possible by thus arranging the push tone signals in time series. As described above, by transmitting the push tone signal on the audio signal, the information can be transmitted, and the determined extraction signal is supplied to the reserved recording start control circuit 25 via the output terminal 40. Further, the eight circuits of the extraction circuits 32 to 39 are integrated into one IC for decoding the push tone signal of the telephone.

Next, each of the above extraction circuits 32 to
A detailed block diagram of an example of 39 is shown in FIG. This figure 6
Shows a circuit configuration for extracting a specific frequency by using an IC-shaped tone decoder IC. Tone decoder IC5
A capacitor 58 is connected between the terminal 1 of 3 (hereinafter referred to as IC53 ₁ ) and the ground. Similarly IC53 ₂ and IC
53 ₄ capacitors 59 and 55 are grounded and the ground. A terminal 52 is connected to the IC 53 ₃ via a capacitor 60, and a sub audio signal from the tuner 22 is supplied via the terminal 52. Further, ₄ IC 53 is grounded through a capacitor 55, a power supply voltage (DC5
V) is also connected.

The IC 53 ₅ is connected to one terminal of the resistor 57, the other terminal of the resistor 57 is connected to one terminal of the capacitor 56. One terminal of the capacitor 56 is also connected to the IC53 ₆ . The other terminal of the capacitor 56 is connected with the IC 53 _7, it is grounded. IC53 ₈ is connected to the power supply voltage (DC5
V), and further connected to the terminal 61.

In the tone decoder IC 53, the center frequency can be set by the connected resistor 57 and capacitor 56. Further, since the bandwidth of this reacted frequency can be adjusted by the capacitor 56, the resistance 57
It is possible to adjust so as to absorb variations in the components of the capacitor 56 and variations in the audio frequency supplied from the tuner. That is, this extraction circuit
It is a circuit that determines whether or not a signal having a predetermined frequency is present.

A detailed block diagram of the tone decoder IC 53 is shown in FIG. Tone decoder IC53
_A voltage comparison circuit 71 is connected to ₁ (output filter). In the voltage comparison circuit 71, the detection circuit 73
The detection result supplied from the IC531 is compared with the signal from the IC53 ₁ . The comparison result is supplied from the voltage comparison circuit 71 to the output logic drive circuit 72. In the output logic drive circuit 72, the logic output is I in response to the supplied comparison result.
Supplied via C53 ₈ (output).

The IC53 ₂ (loop filter) has a PL
An L (Phase Locked Loop) 74 is connected. IC53
The signal from ₃ (input) is detected by the detection circuit 73 and P
It is supplied to the LL74. The PLL 74 has an IC
53 ₅ (timing register) signal and IC5
A signal from 3 ₆ (timing capacitor) is supplied. IC53 ₄ is connected to the power supply voltage (V _CC ) and IC5
3 ₇ is grounded.

This tone decoder IC is, for example, RHO.
BA1604 manufactured by M, XR567 manufactured by Exar, NE567 manufactured by Signetics, LM567 manufactured by National Semiconductor and the like are used.

Here, an example of a control algorithm for starting reserved recording in the other embodiment described above is shown in the flowchart of FIG. In this flowchart, control starts from step S81, and in step S81, it is determined whether or not one minute before the reserved recording start time. If it is determined that it is not one minute before, the control moves to step S81 again, and 1
If it is determined that it is minutes ago, the control proceeds to step S82. In step S82, the recording / reproducing apparatus is set to the reserved recording standby information. In step S83, it is determined whether or not the signal extracted from the supplied sub audio signal is the program start instruction code. If it is determined that the code is not the program start instruction code, the control proceeds to step S83 again, and if it is determined that it is the program start instruction code, the control proceeds to step S84. Then, in step S84, recording is started and this flowchart ends.

As described above, according to the above method, in television broadcasting in which a program start instruction code is placed as a program information signal in a sub-audio signal to be broadcast, a reserved recording start is performed in response to the program start instruction code. By doing so, it has been shown that it is possible to realize an apparatus for accurately performing reserved recording by absorbing a clock error built in the recording / reproducing apparatus or a delay in the actual broadcast start time.

In the control algorithm shown in FIG. 8 above,
When the recording / playback device is in the recording standby state and the detection of the program start instruction code is started from 1 minute before the reserved recording, the built-in clock has advanced by 1 minute or more, or the program has started 1 minute or more earlier. Can not correspond to. However, it goes without saying that this can be dealt with by starting the detection of the program start instruction code earlier.

In the above-mentioned example, the code indicating the start of the program is transmitted. However, instead of this, a code unique to this program, that is, a program recognition code is transmitted, and is instructed at the time of recording reservation. It goes without saying that the same effect can be obtained by the method of recording only when the code matches.

Here, an example of a reserved recording start control algorithm using this program recognition code as a program information signal is shown in the flowchart of FIG. This flowchart starts at step S91, and at step S91,
It is determined whether the signal extracted from the sub audio signal is a program recognition code. If it is determined that the code is not the program recognition code, the control proceeds to step S91 again, and if it is determined that it is the program recognition code, the control proceeds to step S92. In step S92, it is determined whether the extracted program recognition code is reserved for recording. If it is determined that the recording reservation has not been made, the control proceeds to step S91. If it is determined that the recording reservation has been made, the control proceeds to step S93. Then, in step S93, recording is started, and the control of this flowchart ends.

As described above, by using the above-mentioned method, in the television broadcasting in which the program recognition code is placed in the sub audio signal at the start of the program and broadcast, if the code matches the code instructed at the time of the recording reservation, the reserved recording is performed. When the recording is started, it is possible to realize a device for accurately recording a reserved recording by absorbing a clock error built in the recording / reproducing device or a delay in the actual broadcast start time. Further, by always detecting the program recognition code, the reserved recording can be accurately performed even if the program is changed or the broadcast time is changed.

In another embodiment of the present invention, the control signal is placed on the sub-audio signal, but it goes without saying that the same effect can be obtained by placing the control signal on the main audio signal.

[0036]

According to the present invention, a recording / reproducing apparatus controlled by a program start instruction code or a program recognition code as the program information signal is possible in television broadcasting in which the program information signal is carried on an audio signal for broadcasting. Therefore, accurate reservation recording can be realized by transmitting and receiving the program start instruction code or the program recognition code.

[Brief description of drawings]

FIG. 1 shows an embodiment of a television recording / reproducing apparatus to which the present invention can be applied.

FIG. 2 is another embodiment of a television recording / reproducing apparatus to which the present invention can be applied.

FIG. 3 is a schematic diagram showing a relationship between a key matrix of a telephone and a standard frequency.

FIG. 4 is an example of a program information signal extraction circuit to which the present invention can be applied.

FIG. 5 is a schematic diagram used for explaining tone decoding.

FIG. 6 is an example in which a specific frequency to which the present invention can be applied can be detected.

FIG. 7 is a block diagram of a tone decoder IC applied to the present invention.

FIG. 8 shows an example of reserved recording start control to which the present invention can be applied.

FIG. 9 shows an example of reserved recording start control to which the present invention can be applied.

[Explanation of symbols]

11 ... Receiving antenna, 12 ... Tuner, 13 ...
..Program information signal extracting circuit, 14 ... Recording / reproducing circuit,
15 ... Recording / reproducing / control circuit

Claims (5)

[Claims] 1. A television broadcasting system wherein a program information signal is carried on an audio signal so that the television signal can be transmitted and received and the program information signal can be transmitted and received at the same time. 2. A system for receiving a television signal in which a program information signal is carried on an audio signal, and receiving means for receiving the television signal, and program information signal extraction for extracting the program information signal from the audio signal. A television recording / reproducing apparatus comprising: means and output means for outputting the extracted program information signal. 3. The television recording / reproducing apparatus according to claim 2, further comprising a control means for controlling recording / reproduction in response to the extracted program information signal. apparatus. 4. The television recording / reproducing apparatus according to claim 3, wherein reserved recording is started in response to the extracted program information signal. 5. The television recording / reproducing apparatus according to claim 3, wherein reserved recording is started when the extracted program information signal and a program recognition code input for reserved recording match. Recording / reproducing apparatus characterized by.