Television receiver using digital signal processors

Claim 2

A television receiver using DSPs characterized by comprising: an external program memory (211) for storing a plurality of external programs corresponding to television systems; A/D converting means (207) for A/D converting an input image signal and outputting a digital image signal; an image signal processing section (210) for processing the digital image signal, said section comprising a plurality of digital signal processors (A1 to A16) connected to one another, each having an internal program memory, and one of the digital signal processors receiving the digital image signal; system discriminating circuit (500) for discriminating the television system of the input image signal, and generating a timing signal representing a change of the television system and a discrimination signal representing the type of the television system; and transmission means (501) for selecting an external program suitable for the television system of the input image signal in accordance with the discrimination signal output from said system discriminating circuit and transmitting predetermined step data of the selected external program to internal program memories of the plurality of digital signal processors (A1 to A16) in synchronism with the timing signal.

Claim 3

A television receiver using DSPs according to claim 2, characterized in that said transmission means comprises: control signal generating means (402, 403) for generating a control signal (SW) used to start writing data to the internal program memories, when it receives the timing signal from said system discriminating means; write address generating means (405) for designating a write address (WA) of each of the internal program memories; write timing pulse generating means (407) for generating a write timing pulse (WP) for providing data write timing of each internal program memory; and read address generating means (406) for generating a read address used to read program data to be written in each internal program memory from said external program memory.

Claim 4

A television receiver using DSPs according to claim 3, characterized in that the discrimination signal output from said system discriminating means (500) is supplied to said external program memory (211) as a bank select signal.

Claim 5

A television receiver using DSPs according to claim 4, characterized in that: the internal program memory of each DSP has a data input/output portion connected to a movable contact of a first switch for selecting one of an internal line and an external line, an address input portion connected to a movable contact of a second switch for selecting one of an internal address line and an external address line, and a write/read timing pulse input portion connected to an output terminal of an AND circuit; the program data read from said external program memory is supplied to one fixed contact of the first switch and the other fixed contact thereof is connected to a command decoder; a plurality of lower bits of the write address are supplied to one fixed contact of the second switch and an output of a program counter is supplied to the other fixed contact thereof; and the write timing pulse (WP) is supplied to one input terminal of the AND circuit and an output of an address decoder is supplied to the other input terminal thereof, the address decoder decoding a plurality of upper bits of the write address (WA) and determining whether the DSP is selected.