JPS592217B2 - Reception level correction method in broadcast confirmation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for controlling a reception level adjustment attenuator in the commercial broadcast confirmation reception equipment in broadcast confirmation reception equipment that records the broadcast time and commercial broadcast identification name of commercial broadcasts broadcast from broadcast stations. This invention relates to a reception level correction method in a broadcast confirmation system that allows setting values to be adjusted appropriately.

Currently, various types of commercial broadcasting are being carried out, but in order to confirm whether commercial broadcasting is being carried out according to the contract, a commercial discrimination signal and a commercial identification signal are superimposed within the audio band and broadcast, and the commercial broadcasting is confirmed. The receiving equipment records the time when the commercial discrimination signal was received and the commercial discrimination signal.

Since the commercial broadcast confirmation receiving equipment receives commercial broadcasts from a plurality of TV stations, the set value of the reception level needs to be appropriate.

If the set value of the reception level is not appropriate, recording omissions may occur in commercial broadcasts.

The present invention is based on the above consideration, and an object of the present invention is to provide a reception level correction method in a broadcast confirmation system that allows broadcasts from a plurality of TV stations with different broadcast levels to be recorded without omission.

Therefore, the reception level correction method in the broadcast confirmation system of the present invention is provided with a broadcasting station that broadcasts a commercial discrimination signal and a commercial identification signal superimposed on a broadcast signal, and receiving equipment, and the receiving equipment is equipped with The analog input signal obtained by processing the signal is sliced with a plurality of threshold values to create multiple types of binary data, each binary data is compared with a fixed pattern for commercial discrimination signal, and the commercial discrimination signal is When the binarized data of the threshold value whose distance from the commercial fixed pattern is equal to or less than a predetermined value is detected, the binarized data of the threshold value after the detection time is recorded in the memory together with the threshold value as a commercial identification signal. In the broadcast confirmation system.

The method is characterized by counting the number of times a commercial identification signal is received for each threshold based on data recorded in a memory in the receiving equipment, and determining a set value of an attenuator in the receiving equipment that changes the level of the received signal based on this result. It is something.

Hereinafter, the present invention will be explained with reference to the drawings.

Fig. 1 is a diagram showing an overview of a commercial broadcast confirmation system, Fig. 2 is a block diagram of an information superimposition circuit that superimposes a commercial discrimination signal and a commercial identification signal, and Fig. 3 shows a block diagram of a commercial discrimination signal and a commercial identification signal to be broadcast. FIG. 4 is a block diagram of a signal receiving circuit in the commercial broadcast confirmation receiving equipment, FIG. 5 is a diagram illustrating detection of a commercial discrimination signal performed by a microprocessor, and FIG. 3 and thresholds 1 to 3. FIG.

In Fig. 1, 1 is a TV station, 2 is a sponsor, 3 is an agency, 4 and 5 are antennas, 6 is a TV tuner, 7 is a signal detection section, 8 is a memory, 9 is a reception time timer, and 10 is a center. are shown respectively.

Note that although only one TV station is shown, in reality, a plurality of TV stations exist.

When creating a commercial, sponsor 2 requests the agency to create the commercial.

The sponsor 2 provides the TV station 1 with a commercial film or VTR-CM created by an agency and requests commercial broadcasting.

At this time, the sponsor 2 makes a contract with the TV station 1 regarding fees, times, frequency, etc.

Antenna 5, TV tuner 6, signal detection unit 7, memory 8
The receiving time timer and the like constitute a commercial broadcast confirmation reception facility, and receive the commercial broadcast to be broadcast and record the type and broadcast time of the commercial broadcast in the memory 8.

The center 10 periodically reads the data in the memory 8, compares the read data with the broadcast schedule provided in advance by the sponsor 2, and checks whether the commercial broadcast is being carried out as scheduled.

A commercial identification signal of a commercial broadcast and a commercial discrimination signal indicating that a subsequent signal is a commercial identification signal are superimposed on the audio band and broadcast.

FIG. 2 shows an information superimposition circuit that superimposes a commercial discrimination signal and a commercial identification signal into the audio band, in which 11 is a magnetic tape for reproduction, 12 is a magnetic tape for recording, 13 and 14 are BR-amps, 15 and 16 are oscillators, 18 are rectifiers and smoothers, 19 and 21 are switches, 22 are bypass filters, 23 and 25 are bandpass filters, 26 is a mixer, and 27 is a write amplifier, respectively.

The audio of a commercial broadcast is recorded on the reproducing magnetic tape 11, and a synchronizing sound that occurs after a certain period of time from the start of the screen is recorded in advance.

The reproduced synchronous sound passes through a preamplifier 13 and a rectifying/smoothing section 18 and is sent to a synchronous sound detection section (not shown).

When a synchronized sound is detected, a commercial discrimination signal and a commercial identification signal of digital code are modulated and superimposed on the commercial sound.

Oscillators 15, 16, 17 are f. , fl, and f2.

Switch 19 is the signal line l.

is turned on when the digital signal of is logic "1", and when the switch 19 is turned on, the frequency f.

The signal is passed through the bandpass filter 23 to the mixer 26
sent to.

The switch 20 switches the digital signal on the signal line 11 to logic “1”.
'', and when the switch 20 is turned on, a signal of frequency f1 is sent to the mixer 26 via the bandpass filter 24.

The switch 21 switches the digital signal on the signal line 12 to logic “1”.
When the switch 21 is turned on, a signal of frequency f2 is sent to the mixer 26 via the bandpass filter 25.

The audio signal read from the magnetic tape 11 for reproduction has its reduction removed by the bypass filter 22, and is then sent to the mixer 26.
The modulated digital information is superimposed on the removed reduction.

A commercial audio signal superimposed with digital information is recorded on a recording magnetic tape 12, and the contents of the recording magnetic tape 12 are broadcast together with the video signal.

FIG. 3 shows an example of a commercial discrimination signal and a commercial identification signal to be broadcast, and in the figure, CH1 has a frequency f.

CH2 is the communication path by frequency f1, CH2 is the communication path by frequency f1, CH
3 indicates a communication path using frequency f2.

FIG. 4 shows the signal receiving circuit in the commercial broadcast confirmation receiving equipment, in which 28 is an attenuator, 29 is a pass filter, 30 is a preamplifier, and 31 to 33
34 to 36 are rectifying and smoothing circuits, 37 to 39 are A/D converters, 40 is a sampling timer, and 41 is a microprocessor. The received audio signal is transmitted to a tuner 6 and an attenuator 28. , a low-pass filter 29, and a preamplifier 30, and are input to band-pass filters 31, 32, and 33.

The bandpass filter 31 has a frequency f.

The bandpass filter 32 extracts the signal of frequency f
1, and the bandpass filter 33 extracts the signal of frequency f
Extract the second signal.

The signals extracted by the bandpass filters 31, 32, 33 are rectified and smoothed by rectifying and smoothing circuits 34, 35, 36, and the rectified and smoothed signals are sent to the A/D converter 3γ in synchronization with the sampling timer. 38 and 39, and the resulting digital signals are captured and processed by microprocessor 41.

FIG. 5 is a diagram illustrating detection of a commercial discrimination signal performed by the microprocessor 41.

This figure shows an example of detecting a commercial discrimination signal broadcast on channel CH2.

A fixed pattern for the commercial discrimination signal of channel CH2 is prepared in advance in register RX.

The received waveform obtained from the rectifying and smoothing section 35 is distorted as shown.

The received waveform is binarized with a threshold TH, and anything above the threshold TH is a logic "1".

The lower one is assumed to be logic "0".

The binarized data at each sampling point is in register R.
will be shifted in successively.

At each sampling time, the register-out RX bit
The Hamming distance between the pattern and the bit pattern of register R is calculated.

In FIG. 5, at sampling time 14, the register RX
The distance between the contents of and the contents of Regis and R is the smallest.

At sampling time point 14, if the minimum distances are detected not only in channel CH2 but also in other channels CH1 to CH3, and these minimum distances are less than or equal to a predetermined value, it is defined that a commercial discrimination signal has been received,
The value of the reception time timer 9 at this point is recorded in the memory 8, and the commercial identification signal sent subsequent to the commercial discrimination signal is recorded in the memory 8.

Although only one threshold value is shown in FIG. 5, in reality, a plurality of types, for example, three types of threshold values are provided, and similar processing is performed on each binarized data obtained using each threshold value.

FIG. 6 shows the relationship between 17 stations 1 to 6 and threshold values 1 to 3.

If there is only one threshold, for example threshold 2, for converting the rectified and smoothed signal into binary data, 17 stations 1
, TVVS2, TVVB2, etc. cannot receive the commercial discrimination signal and the commercial identification signal.

In order to solve this problem, the multilevel digital signal from the A/D converter 37 is sliced at thresholds of 1, 2 and 3.
The multi-level digital signal from the A/D converter 38 is also sliced with threshold values 1 and 2.3 to create three types of binary data, and the A/D converter 38 The multilevel digital signal from No. 39 is also sliced with threshold values of 1, 2, and 3 to create three types of binary data.

Now, assuming that a commercial discrimination signal and a commercial identification signal are broadcast from 17th station 3, the binarized data obtained by slicing with threshold value 3 will be all "0", and the binarized data obtained by slicing with threshold value "1" will be all "0". The binarized data becomes all "1".

Therefore, regarding the fixed pattern corresponding to the commercial discrimination signal and each binarized data, the binarized data obtained by slicing with the threshold value 2 shows the minimum value.

Then, after the commercial discrimination signal is detected, the binarized data obtained by slicing with the threshold value 2 is recorded in the memory 8 as a commercial discrimination signal.

At this time, the threshold value is also recorded together with the commercial identification signal.

In order to reliably receive commercial discrimination signals and commercial identification signals from stations 1 to 17 TVVB2, etc.,
Preferably, the threshold value 2 is located midway between the lowest signal level and the highest signal level.

In order to position threshold 2 at the intermediate position above, read the contents of memory 8, count the number of times commercial broadcasts have been received for each of thresholds 1, 2 and 3, and calculate the number of times commercial broadcasts have been received for threshold 2 based on this statistic. The set value of the attenuator 28 is adjusted so that the number is the maximum.

As is clear from the above description, according to the present invention, the TV
Even when the broadcast level of a station fluctuates, the effect of being able to record the broadcast without omission can be obtained.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an overview of the broadcast confirmation system, Fig. 2 is a block diagram of a commercial discrimination signal and an information superimposition circuit that superimposes a commercial identification signal, and Fig. 3 is a block diagram of a commercial discrimination signal and frame and dial identification to be broadcast. Figure 4 is a block diagram of a signal receiving circuit in the broadcast confirmation/reception equipment; Figure 5 is a diagram explaining detection of a commercial discrimination signal performed by a microprocessor; Figure 6 is a diagram of a TV station. 1 to 3 and the relationship between threshold values 1 to 3. FIG. 1...TV station, 2...Sponsor, 3.
...Agent, 4 and 5...Antenna, 6.
...TV tuner, 7...signal detection section,
8...Memory, 9...Timer for reception time, 10...Center, 11...Magnetic tape for playback, 12...Recording magnetic tape, 13
and 14... Buri Amp, 15 or 17...
...Oscillator, 18...Rectification smoothing section, 1
9 to 21...Switch, 22...
Bypass filter, 23 to 25... Bandpass filter, 26... Mixer, 27...
...Write amplifier, 28...Attenuator,
29...Low pass filter, 30...
・Preamplifier, 31 to 33... Bandpass filter, 34' to 36... Rectifier and smoothing circuit, 37 to 39... A/D converter, 40.
...Sampling timer, 41...Microprocessor.

Claims (1)

[Claims] 1. A broadcasting station that superimposes a commercial discrimination signal and a commercial identification signal on a broadcast signal and broadcasts the same, and a receiving facility, and the receiving facility processes an analog input signal obtained by processing the received signal using a plurality of threshold values. Create multiple types of binarized data by slicing, compare each binarized data with the commercial discrimination signal fixed pattern, and determine a threshold value at which the distance from the commercial discrimination signal fixed pattern is less than or equal to a predetermined value. When binary data is detected, the broadcast confirmation system is configured to record the binarized data of the threshold value after the detection time in the memory together with the threshold value as a commercial identification signal. A reception level correction method in a broadcast confirmation system characterized by counting the number of receptions of a commercial identification signal for each threshold value based on the data, and determining a set value of an attenuator in the reception equipment that changes the level of the reception signal based on the result. .