JPS5931263B2 - Broadcast confirmation information communication method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a broadcast confirmation information communication system in which a discrimination signal indicating whether or not an identification signal is superimposed on the beginning of a CM identification signal for confirming a CM broadcast is provided.

Recently, with the spread of commercial broadcasts, commercial broadcast confirmation systems have been developed and put into practical use.

The CM broadcast confirmation system is a system whose purpose is to automatically confirm whether or not a commercial TV station broadcasts a commercial according to the contract with the sponsor, and to output the confirmation result.

In this system, in order to confirm the commercial broadcast, a commercial identification signal is inserted in advance into the audio band of the produced commercial, and the commercial identification signal is detected from the TV broadcast commercial.
It is sent to a central computer and checked against the contents of the commercial broadcast contract.

FIG. 1 is a conceptual diagram of a CM broadcast confirmation system, in which each component is shown as a block, and the flow of data between them is shown as a solid line.

The process of broadcast confirmation will be explained based on this diagram: (1) Confirmation requester 2 requests broadcast confirmation from broadcast confirmation company 10 based on application and schedule ■.

(2) On the other hand, the computer center 4 generates in advance a CM identification signal and a CM/I 6 corresponding to it, and sends it to the writing device 3 in the broadcast confirmation company 10 using a writing device input paper tape (■).

(3) The broadcast confirmation company 10 puts the dubbing mother tape (CM audio tape) brought in by the confirmation requester 2 into the writing device 3, specifies CMA 6, and writes the corresponding CM identification signal on the broadcast confirmation tape. ■ is produced and returned to client 2 for confirmation along with the dubbing mother tape, and CM/16 is also notified.

Furthermore, the actually used CMA and CM identification signal are sent to the computer center 4 on the writing device output paper tape (2).

(4) The computer center 4 creates a file from the requested clothing from the confirmation requester 2, the schedule, the CMA actually used, and the CM identification signal.

(5) On the other hand, the confirmation requester 2 uses the broadcast confirmation audio tape ■ received from the confirmation company 10 to create a commercial film/VTR.
Create a commercial and request TV station 1 to broadcast it.

As a result, the schedule ■ is finalized and sent to the computer center 4.

(6) The receiving device 5 is installed corresponding to each TV station,
During broadcasting hours, CM broadcast radio waves are always received, the CM identification signal and reception time are stored, and the CM identification signal is transmitted on public telephone lines late at night.
is transmitted to the computer center 4 including the reception time.

(7) The computer center 4 checks the CM identification signal ■ from the receiving device 5 with the CM identification signal in the file, and selects the corresponding CM.
A confirmation table [phase] is created using A and the reception time and provided to the confirmation requester 2.

In this way, the CM broadcast is confirmed.

The functions of the CM identification signal in this case are, firstly, that it can be completely distinguished from voice and noise in general audio signals, and secondly, that it has a sufficient amount of information to identify the broadcast content, etc. The CM identification signal requires a considerable length of information bits.

If the receiving side were to match all of the information bits for each audio signal, the amount of processing would increase and the configuration would become complicated.In order to simplify this, in the present invention, the discrimination signal of the first function is placed at the beginning. This is the first step to sorting and efficient processing.

In addition, since the CM identification signal must be inaudible to human ears, the insertion band is limited to a low frequency region of approximately 100 Hz or less, and an effective discrimination function is developed according to the characteristics of this low frequency region. The combination of digital signals of multiple frequencies was considered to achieve the desired effect.

SUMMARY OF THE INVENTION An object of the present invention is to provide a broadcast confirmation information communication system that can efficiently discriminate CM identification signals in audio signals and exhibit an effective discrimination function.

In order to achieve the above object, the broadcast confirmation information communication system of the present invention broadcasts a digital signal superimposed on a predetermined frequency position of an audio signal of unit broadcast information, demodulates the digital signal on the receiving side, and transmits the corresponding unit broadcast. In a broadcast confirmation information communication system for confirming the broadcast of information, a discrimination signal consisting of a combination of a single or a plurality of important signals in a plurality of low frequency signals of about 100 or less is provided at the beginning of a digital signal, and the discrimination signal is Among the plurality of low frequency signals, the signal with the lowest frequency is generated most frequently, the signal with the highest frequency is generated least frequently, and an audio signal with a digital signal superimposed and an audio signal without a digital signal superimposed are separated. The receiving side first detects only the discrimination signal, and only when the discrimination signal is detected, detects the digital signal corresponding to the subsequent broadcast content.

The present invention will be described in detail below with reference to examples.

FIGS. 2 and 4 show main circuits of an embodiment of the present invention.

FIG. 2 shows an information signal superimposition circuit for multiplex broadcasting included in the write circuit 3 of FIG.

This is a circuit for superimposing a CM identification signal on a CM tape deck to confirm CM broadcast in multiplex broadcasting.

That is, the playback signals from the right (R) and left/monaural (L/M) tape decks 300 and 302 of the dubbing mother tape sent from the confirmation requester 2 are input to amplifiers (
For example, 100 H
After cutting z and below, amplifier (MA) 33□, 3
3□ to tape decks 34□ and 342.

In the cutoff frequency range of these two channels,
Digital signals of multiple frequencies representing broadcast content are added to one of the channels.

Here, the playback signal of the tape deck 302 is branched, a synchronizing signal is taken out through an amplifier (PA) 35 and a rectifying and smoothing circuit 36, and a synthesizer 44 is provided between the HPF 32□ and the MA 332. Three waves f1. f2. f3 oscillation source 400, 40□, 403
The outputs of switches (SWI) 41□ and (SW
2) Controlled and encoded by digital information through 41□, (SW3) 413, band pass filter (BpFJ) 42□, (BPF2) 4 corresponding to each frequency.
2□ and (BPF3) 423 to create a CM identification signal consisting of a discrimination signal and identification information, which are the essential parts of the present invention.

FIGS. 3a" to 3c are explanatory diagrams of operations in the embodiment of FIG. 2, and are explanatory diagrams of portions related to the CM identification signal, which is the essential part of the present invention.

Figure a shows an example of the frequency characteristics of (HPF) 321.322, where the cutoff frequency is 100 Hz and the frequency f1. f2. f3 is 40Hz and 45Hz respectively
, is set around 55Hz.

In the same figure, ■ to ■ indicate an example of a CM identification signal, and in the same figure, ■ indicates an example of a CM audio output preceded by a synchronization signal, which is superimposed on this audio signal. .

■～■ Low frequency f1. f2. A CM identification signal of f3 is output.

That is, as shown in the figure, fl, f2 .
Discrimination information is provided at the beginning of each of the identification information based on the combination of f3, and this discrimination signal is first detected for the audio signal, and it is discriminated whether or not the audio signal is a superimposed CM identification signal, and the discrimination signal is detected. The identification information of the subsequent broadcast content is detected only in certain cases.

Therefore, since irrelevant audio signals are discarded only by detecting the discrimination signal, efficient processing can be achieved both in terms of structure and time.

As mentioned above, the discrimination signal is selected to be approximately 100 Hz or less, and the lowest frequency is generated most frequently and the highest frequency is generated least frequently depending on the low frequency characteristics of the audio signal.

This configuration is based on ``(1) Normally, broadcast audio signals have few low frequency components, and the amplitude of low frequencies is small;
2) When a low frequency occurs, there is a high possibility that a higher frequency will also occur at the same time.

This is an attempt to improve S/H by creating a tendency opposite to that of a general audio signal.

Further, when noise in a low frequency band occurs, it tends to occur continuously, so it is ensured that all frequencies are not generated at regular intervals in the discrimination signal.

For example, as shown in the figure, a full frequency off section is provided, followed by one long on at f1=40Hz, two short on at f2=45H2, and an entire off section at f3-55H3.

By assembling the discrimination signals in this manner, it is possible to extremely reduce the error in which it is assumed that the CM identification signal is superimposed on the general audio signal.

Figure C shows an example of the frequency characteristics of (BPFI) 421, (BPF2) 42□, and (BPF3) 4230 in Figure 2.

FIG. 4 shows an information signal receiving circuit for multiplex broadcasting included in the receiving device 5 of FIG. 1, and is a main part of the present invention.

In the figure, a tuner 52 receives multiplex broadcasts from an antenna 51.
Extract the L/M channel frequency of a predetermined TV station by
The reception level is adjusted by an attenuator (ATT) 53, and the above-mentioned frequency f1. f2. Bandpass filters (BPF'1) 561 and (BPF"2) 56 corresponding to f3
□, (BPF3) 56a, a pulse waveform is formed by rectifying and smoothing circuits 57□ to 513, respectively, and the waveform is
/D converters 58□ to 583 are sampling timers 59
Converts to a digital signal using sampling pulses from the

Then, the A/D output is input to the threshold value determination circuits 601 to 603, and compared with a predetermined threshold value from the threshold value control circuit 61.
1''', OI+ is output, and this is sent to the distance judgment circuit 62□~
623 and is compared with the corresponding bit of the basic discrimination signal pattern 63, and when it comes closest to matching within a certain time interval, that is, when the number of different bits (distance) is less than a predetermined value, the discrimination signal is It is determined that it has been detected.

Then, these outputs are input to the comparison circuit 64, and a control signal is sent to the threshold control circuit 61 to use the threshold value that minimizes the distance during detection as the threshold value for the detection of the subsequent digital signal.
The microprocessor (MPU) uses the minimum distance as the starting point for detecting the subsequent digital signal.
65 to start the feeding operation.

Therefore, the identification digital signals from each of the threshold determination circuits 601 to 603 detected by setting a new threshold are branched and inputted to the MPU 65, and stored in the memory 61 in association with the reception time timer 66. As mentioned above, it is sent to the late night computer center 4.

As explained above, according to the present invention, in order to confirm the CM broadcast, a discrimination signal indicating whether or not the identification signal is superimposed is provided at the beginning of the CM identification signal, and the receiving side first receives only the discrimination signal. identification information corresponding to the subsequent broadcast content is detected only when a discrimination signal is detected.

As a result, an audio signal on which a CM information signal is superimposed can be distinguished from a general audio signal using a small amount of information,
Furthermore, since the signal is formed with a tendency opposite to that of the voice signal at low frequencies, it leads to an improvement in S/H and has the advantage of greatly reducing errors in the discrimination signal and identification information.

[Brief explanation of the drawing]

Figure 1 is a conceptual diagram of a conventional CM broadcast confirmation system, Figures 2 and 4 are explanatory diagrams showing the configuration of an embodiment of the present invention, and Figures 3a" and 3c are explanations of the operation in the embodiment of Figure 2. In the figure, 1 is a TV station, 2 is a confirmation requester, 3 is a writing device, 4 is a computer center, 5 is a receiving device, 30□, 30□, 341
342 is a tape deck, 32□, 32□ are high pass filters (HPF), 40□~403 are oscillation sources, 41□~4
13 is a switch, 42 to 423 are band pass filters (B
PF), 44 is a synthesizer, 51 is an antenna, 52 is a tuner, 53 is an attenuator, 54 is a low pass filter (LPF)
, 56□ to 563 are band pass filters (BPF), 58
, ~583 is an A/D converter, 59 is a sampling timer, 60□~603 is a threshold value judgment circuit, 61 is a threshold value control circuit, 62□~623 is a distance judgment circuit, 63 is a discrimination signal pattern, and 64 is a comparison circuit. , 65 is a microprocessor (
MPU), 66 is a reception time timer, and 6γ is a memory.

Claims (1)

[Claims] 1. In the broadcast confirmation information communication system, in which a digital signal is superimposed on a predetermined frequency position of the audio signal of unit broadcast information and broadcast, and the receiving side demodulates the digital signal to confirm the broadcast of the corresponding unit broadcast information, the digital signal A discrimination signal consisting of a combination of a single important signal or a plurality of important signals in a plurality of low frequency signals of approximately 100 or less is provided at the beginning of the signal, and the discrimination signal is such that the lowest frequency signal among the plurality of low frequency signals is the most frequently detected. The signal with the highest frequency is generated the most, and the signal with the highest frequency is generated the least frequently, and is used to discriminate between an audio signal with a digital signal superimposed on it and an audio signal without a digital signal superimposed on it.On the receiving side, first, only the discriminated signal is used. A broadcast confirmation information communication system characterized in that a digital signal corresponding to subsequent broadcast content is detected only when a discrimination signal is detected.