JPH06334647A - Digital recording constraint pcm broadcasting system and receiver thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] A broadcasting system and a receiving device for superimposing and transmitting data indicating whether or not to permit digital recording in PCM audio broadcasting using satellites. [Structure] PCM that performs scrambled broadcasting and non-scrambled broadcasting that can be received regardless of whether there is a reception contract
In a transmission signal in audio broadcasting, digital recording permission / inhibition data d1 indicating whether or not to permit digital recording is superimposed together with pay broadcast subscriber data D1 for each low-order multiplexed signal constituting the transmission signal. In addition, in receiving the transmission signal, demodulation of the PCM voice signal (PCM demodulation unit 4
The pay broadcasting subscriber data d1 demodulated together with b) is discriminated, and when it is discriminated that the subscriber is a subscriber, the predetermined data for enabling digital recording by the digital recorder is outputted, and when it is discriminated that the subscriber is not the digital subscriber. The specified data that disables recording is output (B2).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a PCM using a satellite.
The present invention relates to a digital recording constrained PCM broadcasting system and a receiving apparatus thereof that superimposes and transmits data indicating whether or not digital recording is permitted, in addition to a scrambled or non-scrambled broadcasting mode.

[0002]

2. Description of the Related Art PCM audio broadcasting using satellites has also started, and receivers are also on the market accordingly. Since this PCM audio broadcasting is a digital signal, it has a great feature that it has good sound quality. On the other hand, consumer digital recording devices such as DAT (digital audio tapes) have also attracted attention in the market. Therefore, the number of people who desire to record PCM audio broadcasting as digital signals with this digital recording device will increase more and more in the future. Expected to go. However, it is considered that there is no copyright problem in the future in digital recording that can record with almost no deterioration in sound quality. Currently, in the field of DAT, the number of times of copying (recording) is limited by SCMS (Serial Copy Management System) by category code or the like in order to harmonize with the copyright problem. In the current reception of PCM audio broadcasting, in the case of scrambled broadcasting (paid), non-subscribers cannot normally receive (scramble decryption) and record, but in the case of non-scrambled broadcasting, even non-subscribers receive normally. It is also possible to record with digital voice. That is, whether or not digital recording is possible is handled in the same category as whether or not scramble decoding is possible, and at present, there is no broadcasting mode in which restrictions are placed on digital recording.

[0003]

Therefore, it is conceivable that there is a broadcasting form in which the propriety of digital recording is distinguished from the propriety of scramble decoding. It is considered that this will promote subscription to pay broadcasting and further harmonize with the above copyright problem. SUMMARY OF THE INVENTION It is an object of the present invention to provide a digital recording restricted PCM broadcasting system and a receiving apparatus thereof, which can independently determine whether or not digital recording is possible based on the above concept.

[0004]

DISCLOSURE OF THE INVENTION The present invention provides a scrambled broadcast in which the presence or absence of a reception contract is determined from pay broadcast subscriber data, and the scramble decoding of the received signal is performed only when the reception contract is made. , Non-scrambled broadcasting that can be received regardless of whether there is a reception contract P
In a transmission signal in a CM audio broadcast, digital recording permission data indicating whether or not to permit digital recording together with the pay broadcasting subscriber data is superposed for each low-order multiplexed signal constituting the transmission signal. Recording-restricted PCM broadcasting system, and in the reception of the transmission signal in the PCM audio broadcasting including the pay broadcasting subscriber data and digital recording enable / disable data, the pay broadcasting subscriber data demodulated and demodulated with the PCM audio signal When it is determined that the subscriber is a subscriber based on the data, predetermined data that enables digital recording by the digital recorder is output, and when it is determined that the subscriber is not a subscriber, the predetermined data that disables digital recording is output. And a broadcast signal receiving apparatus according to the above method. .

[0005]

In addition to the current signals of the broadcasting source and pay broadcasting subscriber data, the broadcasting station side newly transmits the digital recording permission / prohibition data for determining the permission / prohibition of the digital recording permission. Since the PCM audio broadcasting has a form in which a plurality of independent low-order multiplexed signals (channels) are multiplexed on one carrier and transmitted, the digital recording enable / disable data is included for each low-order multiplexed signal. In receiving the signal,
Whether or not digital recording is possible is determined by detecting digital recording enable / disable data together with ordinary scramble decoding. In this determination, if digital recording is permitted, data indicating that is output, and if digital recording is not permitted, data indicating that is output. The digital recorder follows the output data.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A digital recording restricted PCM broadcasting system and its receiving apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of the essential parts showing one embodiment of each of a transmitting side (FIG. A) and a receiving device (FIG. B) related to a digital recording restricted PCM broadcasting system and a receiving device thereof according to the present invention, and FIG. It is explanatory drawing of the output data with respect to a digital recorder. FIG. 3 is a main part configuration diagram showing another embodiment of the receiving apparatus. In FIG. 1A, 1a is a first multiplexing and scrambling system (hereinafter referred to as "scramble system"), 2a is a second scrambling system, 3a is an Nth scrambling system, and 4a is one carrier. S1 is a system that multiplexes the signals from each scramble system for transmission, 5a is a modulation / unload system that carries out (transmits) at a predetermined carrier frequency by predetermined modulation, S1
~ Sn is audio source, D1 ~ Dn is pay broadcasting subscriber data, d1
~ Dn is digital recording enable / disable data. Further, in FIG. 1B, 1b is a carrier wave selecting unit and 2b is a carrier wave selecting unit.
Demodulation of the signal selected in 1b and a demodulation unit / source selection unit for selecting a desired low-order multiplexed signal (channel) from the demodulated signal, 3b a descrambling unit, 4b a PCM demodulation unit, 5b
Is a consumer digital voice recorder.

Next, the operation of the present invention will be described separately for the transmitting side and the receiving device. (1) Transmitting side [FIG. 1 (A)] In FIG. 1 (A), the system excluding d1 to dn is a conventional system. That is, one feature of PCM audio broadcasting is that a plurality of audio sources are transmitted by one carrier. Each scrambled audio source and pay broadcast subscriber data form one signal, which is generally referred to as "low-order multiplexed signal". Each of the scramble systems (1a to 3a) converts this low-order multiple signal. In Japan, one carrier currently includes six low-order multiplexed signals (that is, n = 6 in Fig. A). What is further multiplexed each of the above low-order multiplexed signals is called "high-order multiplexed signal",
The multiplexing system 4a performs this multiplexing. The high-order multiplexed signal output from the multiplexing system 4a becomes a modulation wave, and the modulation / export system 5a modulates a carrier wave of a predetermined frequency by a predetermined method. The output of the modulation / delivery system 5a becomes a transmission radio wave. The above is the outline of the conventional system, but the method according to the present invention is to add (superimpose) digital recording enable / disable data to each of the low-order multiplexed signals. The digital recording permission / prohibition data is a signal used for determining whether or not digital recording is permitted. Then, the superimposing method may be the same as the current superimposing of pay broadcasting subscriber data, and may be included in, for example, “individual information” including the pay broadcasting subscriber data. The "individual information" is one of various information signals transmitted together with the audio signal in PCM audio broadcasting. A signal on which digital recording enable / disable data is superimposed becomes a transmission signal of the system according to the present invention.

(2) Receiver [FIGS. 1 (B) and 3] The configuration itself of the receiver shown in FIG. 1 (B) is the same as the conventional one. The signal on which the digital recording enable / disable data is superimposed is input to the carrier selecting section 1b of the receiving device via the receiving antenna, and the signal of the desired carrier is selected. Carrier selection section
The signal of the required carrier selected in 1b is subjected to predetermined processing such as frequency conversion and sent to the demodulation / source selection section 2b. The demodulation in the demodulator / source selector 2b is to demodulate the "higher-order multiplexed signal", and the source selection is the "low-order multiplexed signal" required from the demodulated higher-order multiplexed signal.
Is to choose. That is, demodulation unit / source selection unit
The signal output from 2b is an individual low-order multiplexed signal. The PCM demodulation unit 4b descrambles the low-order multiplexed signal 3b.
The digital voice B1 is output by the ordinary scramble decoding and PCM demodulation in cooperation with the digital voice recording enable / disable data. From the detected data, the PCM demodulator 4b outputs a signal having the content shown in FIG. Hereinafter, description will be made with reference to FIG.

When a digital voice is recorded by the digital recorder, as shown in FIG. 1B, the control signal B2 is sent from the signal source side in addition to the voice signal B1. The control signal B2 is a digital signal, and its bit array includes 2-bit data that determines whether or not digital recording is possible (SCMS for DAT). These two bits are "bit0" and "bit1" in FIG. When these 2 bits are "00" (N01), digital audio recording is possible with consumer audio equipment. In other cases (N02), it is not possible to record with consumer audio equipment due to the digital recordable area of business equipment. Become.

The present invention takes advantage of the characteristics of the current rule concerning DAT and converts the digital recording permission / prohibition data into the recording permission / prohibition data based on this rule. In other words, the PCM demodulation unit 4b sets the above 2 bits to (N0
The data of 1), and if it is not recordable, it is any of the data of (N02). From this, the present invention is intended for consumer appliances. From the above description, it is possible to make the availability of digital recording, which is dependent on the availability of conventional scramble decoding, independent. As a result, it is possible to disable digital recording even in non-scrambled broadcasting, and it is also possible to implement a method of permitting subscribers to perform digital recording as well as scramble decoding in scrambled broadcasting. Since the present invention is intended for digital recording, it handles analog voice in the same manner as in the past. Next, FIG. 3 will be described. Figure 3
The output switching circuit 6b is added to the configuration shown in FIG. When the PCM demodulator 4b outputs the above-mentioned digital recording permission data, the output switching circuit 6b is turned on to supply a signal to the digital recorder 4b, and in other cases, this switching circuit is turned off. The PCM demodulation unit 4b thus switches the output switching circuit 6b by the switching signal B3.

[0011]

As described above, according to the present invention, it is possible to determine whether or not to permit digital recording independently of whether or not scramble decoding is possible in the past. Becomes In addition, it can be expected that this will promote subscription to pay broadcasting and can further harmonize with copyright issues.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram showing an embodiment of a digital recording restricted PCM broadcasting system and a receiving device according to the present invention.

FIG. 2 is an explanatory diagram of output data indicating whether digital recording is possible.

FIG. 3 is a main part configuration diagram showing another embodiment of the receiving device.

[Explanation of symbols]

 1a First multiplexing and scrambling system 4a Multiplexing system 5a Modulation / export system S1 Audio source D1 Pay broadcasting subscriber data d1 Digital recording enable / disable data 1b Carrier selection section 2b Demodulation / source selection section 3b Descramble section 4b PCM demodulation Part 5b Digital voice recorder 6b Output switching circuit

Claims (4)

[Claims] 1. A scrambled broadcast in which the presence / absence of a reception contract is determined from pay-broadcast subscriber data, and the scramble decoding of the received signal is performed only when the reception contract is made, regardless of whether the reception contract is present or not. In the transmission signal in the PCM audio broadcasting which performs the non-scrambled broadcasting that can be received, the digital recording permission / inhibition data indicating whether or not the digital recording is permitted together with the pay broadcasting subscriber data are included in the individual low-order signals that constitute the transmission signal. A digital recording constrained PCM broadcasting system characterized in that it is superposed for each multiplexed signal. 2. When receiving a transmission signal in PCM audio broadcasting including pay broadcasting subscriber data and digital recording enable / disable data, the pay broadcasting subscriber data demodulated together with the demodulation of the PCM audio signal is discriminated, and When it is determined from the data that the subscriber is a subscriber, predetermined data that enables digital recording by the digital recorder is output, and when it is determined that the subscriber is not a subscriber, the predetermined data that disables the digital recording is output. A digital signal restriction device for receiving a broadcast signal by the PCM broadcasting system. 3. The receiving apparatus according to claim 2, wherein the predetermined data that enables digital recording and the predetermined data that disables digital recording are data signals suitable for a consumer digital audio tape. 4. The pay broadcasting subscriber data demodulated together with the demodulation of the PCM audio signal in the reception of the transmission signal in the PCM audio broadcasting including the pay broadcasting subscriber data and the digital recording enable / disable data, 3. An output switching circuit for supplying a digital voice output to a digital recorder when it is discriminated from the data that it is a subscriber and for shutting off the digital voice output when it is discriminated as a non-subscriber. The receiver described.