Receiver provided with a frequency synthesizer capable of storing fine tuning information

Claim 2

A receiver comprising a first set of keys, a second set of keys, means coupled to said first set of keys for producing an address signal corresponding to a channel number designated by operation of at least one key of said first set, a first memory device storing frequency-division ratio data for each designatable channel number, a second memory device storing fine tuning data for varying said frequency-division ratio data, means coupled to said producing means and said first and second memory devices for applying the address signal produced by said producing means to said first memory device and at the same time to said second memory device to read out both said frequency-division ratio data and said fine tuning data corresponding to the designated channel number from said first and second memory devices, a frequency divider, means coupled to said first and second memory devices for generating a new frequency-division ratio data to be set into said frequency divider in response to said frequency-division ratio data and said fine tuning data corresponding to said designated channel number, means responsive to said new frequency-division ratio data set into said frequency divider for providing a local oscillation signal, and means responsive to operation of at least one of said second set of keys for storing a fine tuning data in said second memory device.

Claim 3

A receiver as claimed in claim 1, wherein said first and second memory devices are a read only memory and a read/write memory, respectively, and said generating means comprises an up/down counter, said up/down counter generating said new frequency-division ratio data by counting said frequency-division ratio data up or down in accordance with said fine tuning data.

Claim 4

A receiver as claimed in claim 2, wherein said applying means comprises a first controller controlling said read only memory and a second controller controlling said read/write memory, said address signal being supplied to both first and second controllers, said frequency-division ratio data read out of said read only memory being supplied to said generating means through said first controller, and said fine tuning data read out of said read write memory being supplied to said generating means through said second controller.

Claim 5

A receiver claimed in claim 3, wherein said producing means has a key input detector detecting which key of said first set of keys is depressed, said input detector further detecting which key of said second set of keys is depressed.

Claim 6

A receiver claimed in claim 1, wherein said first set of keys are used to directly designate channel numbers.

Claim 7

A receiver comprising a first key section for directly designating a channel number, a second key section for carrying out manual fine tuning operation, a key input detector generating a first detection signal when said first key section is operated and a second detection signal when said second key section is operated, a read only memory storing a plurality of frequency-division ratio data for each designatable channel number, a first controller reading out a predetermined frequency-division ratio data corresponding to a designated channel number by said first key section from said read only memory in response to said first detection signal, means responsive to said second detection signal for producing manual fine tuning data for varying said predetermined frequency-division ratio data, a read/write memory, a second controller enabling said read/write memory to memorize said manual fine tuning data therein in response to said second detection signal, and reading out said manual fine tuning data corresponding to said designated channel number from said read/write memory in response to said first detection signal, means responsive to said predetermined frequency-division ratio data and said manual fine tuning data for generating a new frequency-division ratio data for said designated channel number and means responsive to said new frequency-division ratio data for providing a local oscillation signal, whereby a second manual fine tuning operation for said designated channel number is unnecessary.

Claim 8

A receiver comprising a first key section for directly designating a channel number, a second key section for carrying out manual fine tuning operation, a key input detector generating a first detection signal when said first key section is operated and a second detection signal when said second key section is operated, a read only memory storing a plurality of frequency-division ratio data for each designatable channel number, a first controller reading out a predetermined frequency-division ratio data corresponding to a designated channel number by said first key section from said read only memory in response to said first detection signal, means responsive to said second detection signal for producing manual fine tuning data for varying said predetermined frequency-division ratio data, a read/write memory, a second controller enabling said read/write memory to memorize said manual fine tuning data therein in response to said second detection signal, and reading out said manual fine tuning data corresponding to said designated channel number from said read/write memory in response to said first detection signal, means responsive to said predetermined frequency-division ratio data and said manual fine tuning data for generating a new frequency-division ratio data for said designated channel number and means responsive to said new frequency-division ratio data for providing a local oscillation signal, whereby a second manual fine tuning operation for said designated channel number is unnecessary.

Claim 9

A receiver as claimed in claim 6, wherein said first detection signal is supplied simultaneously to said first and second controllers.

Claim 10

A receiver comprising a key operation section including a first set of keys for directly designating a plurality of channel numbers and a second set of keys having at leat one key for carrying out a manual fine tuning function, means responsive to operation of said first set of keys for obtaining predetermined frequency-division ratio data corresponding to a desired channel number designated by operation of said first set of keys, means responsive to operation of said at least one key in said second set of keys for producing manual fine tuning data for varying said predetermined frequency-division ratio data, means responsive to operation of said at least one key in said second set of keys for memorizing said manual fine tuning data, means for reading out said manual fine tuning data from said memorizing means, means responsive to said predetermined frequency-division ratio data from said obtaining means and said manual fine tuning data through said reading out means for generating new frequency-division ratio data, means responsive to operation of at least one key in said first set of keys used to directly designate said desired channel number for activating said reading out means and said generating means in order to generate said new frequency-division ratio data, a frequency divider receiving said new frequency-division ratio data, and means responsive to said new frequency-division ratio data for providing a local oscillation signal.

Claim 11

A receiver comprising a key operation section including a first set of keys for directly designating a plurality of channel numbers and a second set of keys having at leat one key for carrying out a manual fine tuning function, means responsive to operation of said first set of keys for obtaining predetermined frequency-division ratio data corresponding to a desired channel number designated by operation of said first set of keys, means responsive to operation of said at least one key in said second set of keys for producing manual fine tuning data for varying said predetermined frequency-division ratio data, means responsive to operation of said at least one key in said second set of keys for memorizing said manual fine tuning data, means for reading out said manual fine tuning data from said memorizing means, means responsive to said predetermined frequency-division ratio data from said obtaining means and said manual fine tuning data through said reading out means for generating new frequency-division ratio data, means responsive to operation of at least one key in said first set of keys used to directly designate said desired channel number for activating said reading out means and said generating means in order to generate said new frequency-division ratio data, a frequency divider receiving said new frequency-division ratio data, and means responsive to said new frequency-division ratio data for providing a local oscillation signal.

Claim 12

A receiver as claimed in claim 8, wherein said generating means comprises an up/down counter, said predetermined frequency-division ratio data being set into said up/down counter, said up/down counter counting said predetermined frequency-division ratio data up or down in response to said manual fine tuning data, thereby generating said new frequency-division ratio data.