Claims
- 1. A digital signal receiving apparatus for receiving a digital broadcasting signal, comprising:
packet receiving means for receiving a transport stream in MPEG2-systems on which a plurality of channels are multiplexed; demodulating means for demodulating a signal received by said packet receiving means; and output means for outputting an output stream in which predetermined packets are replaced into a separated stream when a changing point occurs in the separated stream, said separated stream being such that an audio packet and a video packet of a selected channel are extracted from the signal demodulated by said demodulating means and a Program Association Table (PAT) in the MPEG2-systems is extracted from the transport stream received by said packet receiving means.
- 2. A digital signal receiving apparatus according to claim 1, wherein said PAT included in said output stream is replaced with a PAT described only on the selected channel.
- 3. A digital signal receiving apparatus according to claim 1, wherein said PAT includes a PID of a Program Map Table (PMT) described only on the selected channel.
- 4. A digital signal receiving apparatus according to claim 1, wherein a plurality of said predetermined packets are inserted in said output stream consecutively when a changing point occurs in said separated stream.
- 5. A digital signal receiving apparatus according to claim 1, wherein said predetermined packet has a PID irrespective of the PID of the packet in said separated stream.
- 6. A digital signal receiving apparatus according to claim 1, further comprising:
a packet separating circuit extracting a designated packet from a bit stream output from said packet receiving means; and a packet replacing circuit for replacing at least a portion of packets output from said packet separating circuit by a predetermined signal and providing an output signal to said output means.
- 7. A digital signal receiving apparatus according to claim 6, wherein said packet separating circuit comprises:
a temporary storage circuit temporarily storing an inputted signal; a detecting circuit detecting a specific signal from the signal temporarily stored in said temporary storage circuit; a first storage circuit and a second storage circuit storing a signal entered from a control circuit; a comparing circuit for comparing the signal detected by said detecting circuit with the signal stored in said first storage circuit; and a selecting circuit for selecting said input signal, the signal temporarily stored in said temporary storage circuit, for the signal stored in said second storage circuit; and wherein when said specific signal is a predetermined value, either a portion or all of the packets containing said specific signal are replaced by the signal stored in said second storage circuit.
- 8. A digital signal receiving apparatus according to claim 7, wherein said specific signal is ID information indicative of at least an attribute of said packet.
- 9. A digital signal receiving apparatus according to claim 7, wherein said packet replaced by said packet replacing circuit is such a packet having at least information regarding a selection of said logical channel.
- 10. A digital signal receiving apparatus according to claim 6, wherein said packet separating means comprises:
a storage circuit storing therein a signal entered from a control circuit; and a selecting circuit selecting said input signal, or the signal stored in said storage circuit under control of said control circuit, wherein said packet separating circuit replaces a portion, or all of packets by the signal stored in said storage circuit under control of said control circuit.
- 11. A digital signal receiving apparatus according to claim 7, wherein said selecting circuit selects said input signal, the signal temporarily stored in said temporary storage circuit, or the signal stored in said second storage circuit under control of said comparing circuit and a control circuit according to a first mode in which when said specific signal is equal to a predetermined value, either a portion or all of the packets containing said specific signal is replaced by the signal stored in said second storage circuit or a second mode in which either a portion or all of the packets containing said specific signal is replaced by the signal stored in said second storage circuit irrelevant to the value of said specific signal under control of said control circuit.
- 12. A digital signal receiving apparatus according to claim 11, wherein said second storage circuit stores therein plural sorts of signals; and
said apparatus further comprising: an output control circuit controlling the output derived from said second storage circuit under control of said control circuit, wherein a packet signal replaced by said replacing circuit can be selected by said control circuit.
- 13. A digital signal receiving apparatus according to claim 10, wherein said separating circuit has a normal mode for extracting a designated packet, and a through mode for extracting all of the packets, and
wherein at least said packet replacing circuit is set to said second mode, said separating circuit is set to the through mode.
Priority Claims (2)
Number |
Date |
Country |
Kind |
08-336808 |
Dec 1996 |
JP |
|
09-205769 |
Jul 1997 |
JP |
|
Parent Case Info
[0001] The present application is a continuation of U.S. application Ser. No. 09/851,196, filed May 9, 2001; which is a continuation of U.S. application Ser. No. 08/986,074, filed Dec. 5, 1997, now U.S. Pat. No. 6,289,026, the contents of which are incorporated herein by reference.
Continuations (2)
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Number |
Date |
Country |
Parent |
09851196 |
May 2001 |
US |
Child |
10164614 |
Jun 2002 |
US |
Parent |
08986074 |
Dec 1997 |
US |
Child |
09851196 |
May 2001 |
US |