Radio receiver with clock signal controlled to improve the signal to noise ratio

• US 5,142,699 A
• Filed: 09/05/1991
• Issued: 08/25/1992
• Est. Priority Date: 07/15/1988
• Status: Expired due to Term

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Sato, Toshifumi, Ide, Motoki
• Primary Examiner(s): KUNTZ, CURTIS A
• Application Number:
  US07/759,040
• Time in Patent Office: 355 Days
• Field of Search: 455/228, 455/229, 455/38, 455/343, 455/127, 340/825.44, 340/825.48, 340/825.53, 340/311.1
• US Class Current: 340/7.32
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: H04W 88/022 Selective call receivers
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In a radio paging receiver comprising a receiving section (11), a decoder section (12), and a CPU (13) for distinguishing a specific one of a plurality of call signals and processing a specific message signal succeeding the specific call signal into a processed message signal, the receiving section is intermittently put into operation. The decoder section is put into operation in accordance with a first clock signal which is supplied from a first clock generator (16). A switching circuit (20) selectively connects the CPU with the first clock generator and a second clock generator (17). More particularly, the CPU is put into operation in accordance with a second clock signal which is supplied from the second generator when the receiving section does not operate. The frequency of the second clock signal is much higher than that of the first clock signal. Therefore, the CPU processes the specific message signal into the processed message signal at a rapid processing speed in accordance with the second clock signal when the receiving section is not put into operation.

Claims

1. In a radio communication apparatus comprising receiving means intermittently put into operation for receiving a plurality of call signals and a plurality of additional signals succeeding said call signals, respectively, distinguishing means connected to said receiving means for distinguishing a specific one of said call signals which is specific to said apparatus in order to receive a specific additional signal succeeding said specific call signal among said plurality of additional signals, processing means connected to said distinguishing means for processing said specific additional signal into a processed additional signal, and operating means for operating said distinguishing means and said processing means, the improvement wherein said operating means comprises:

first clock generating means for generating a first clock signal having a first frequency;

second clock generating means for generating a second clock signal having a second frequency which is higher than said first frequency;

first supplying means for supplying said distinguishing means with said first clock signal to operate said distinguishing means; and

second supplying means for supplying first clock signal to said processing means to operate said processing means when receiving means is put into operation, and, otherwise, for supplying said second clock signal when to said processing means to operating said processing means.

2. In a radio communication apparatus comprising receiving means intermittently put into operation for receiving a plurality of call signals and a plurality of additional signals succeeding said call signals, respectively;

said apparatus further comprising operating signal producing means for intermittently producing an operating signal for use in putting said receiving means into operation;

delay means for delaying said operating signal with a predetermined time duration to produce a delayed operating signal;

switching signal producing means for producing a switching signal in response to said operating signal and said delayed operating signal;

distinguishing means connected to said receiving means for distinguishing a specific one of said call signals which is specific to said apparatus in order to receive a specific additional signal succeeding said specific call signal among said plurality of additional signals;

stand-by signal producing means connected to said distinguishing means for producing a stand-by signal indicative of a reception of said specific additional signal when said distinguishing means distinguishes said specific one of said call signals;

processing means connected to said distinguishing means for processing said specific additional signal into a processed additional signal;

operating means for operating said distinguishing means and said processing means;

first clock generating means for generating a first clock signal having a first frequency;

second clock generating means for generating a second clock signal having a second frequency which is higher than said first frequency;

first supplying means for supplying said distinguishing means with said first clock signal to operate said distinguishing means;

second supply means for supplying first clock signal to said processing means to operate said processing means when receiving means is put into operation, and, otherwise, for supplying said second clock signal to said processing means to operate said processing means;

said second supplying means further comprising;

driving means responsive to said operating signal and said stand-by signal for driving said second clock generating means; and

switching means responsive to said switching signal for connecting said second clock generating means to said processing means.

3. In a radio communication apparatus, comprising receiving means intermittently put into operation for receiving a plurality of call signals and a plurality of additional signals succeeding said call signals, respectively;

said apparatus further comprising operating signal producing means for intermittently producing an operating signal for use in putting said receiving means into operation;

distinguishing means connected to said receiving means for distinguishing a specific one of said call signals which is specific to said apparatus in order to receive a specific additional signal succeeding said specific call signal among said plurality of additional signals, processing means connected to said distinguishing means for processing said specific additional signal into a processed additional signal, operating means for operating said distinguishing means and said processing means, the improvement wherein said operating means comprises;

first clock generating means for generating a first clock signal having a first frequency;

second clock generating means for generating a second clock signal having a second frequency which is higher than said first frequency;

driving signal producing means for producing a driving signal for use in driving said second clock generating means when said operating signal producing means stops producing said operating signal;

switching signal producing means responsive to said operating signal for producing a switching signal after a predetermined time duration;

first supplying means for supplying said distinguishing means with said first clock signal to operate said distinguishing means; and

second supplying means for supplying said first clock signal to said processing means to operate said processing means when receiving means is put into operation, and, otherwise, for supplying said second clock signal to said processing means to operating said processing means; and

said second supplying means further comprises;

switching means responsive to said switching signal for connecting said second clock generating means to said processing means.

4. A receiver comprising:

first means intermittently put into operation for receiving a coded signal in order to produce said coded signal as a received signal during the operation;

second means coupled to said first means for decoding said received signal into a decoded signal;

first clock generating means for generating a first clock signal having a first frequency;

second clock generating means for generating a second clock signal having a second frequency which is higher than said first frequency; and

control means coupled to said first means, said second means, and said first and said second generating means for supplying said second clock signal to said second means when said first means is not put into operation, said control means stopping the supply of said second clock signal to said second means in order to supply said first clock to said second means when said first means is put into operation.

5. A selective calling radio receiver comprising:

receiver means for receiving a coded signal to produce said received signal as a received signal;

decoder means coupled to said receiver means for decoding said coded signal into a decoded signal;

data processing means coupled to said decoder means for processing said decoded signal into a processed signal;

selecting means coupled to said decoder means and said data processing means for selecting one of first and second clock signals as a selected clock signal to supply said selected clock signal to said data processing means;

first clock generating means coupled to said decoder means, said data processing means, and said selecting means for generating said first clock signal;

second clock generating means coupled to said selecting means and said data processing means for generating said second clock signal which has a frequency that is higher than the frequency of said first clock signal; and

deactivating means coupled to said decoder means, said receiving means, and said second clock generating means when said receiving means is put into operation.

6. A selective calling radio receiver claimed in claim 5, further comprising activating means coupled to said decoder means, said second clock generating means, and said receiving means for activating said second clock generating means when said receiving means is not put into operation.

7. A selective calling radio receiver claimed in claim 6, wherein said selecting means selects one of said first and said second clock signals in response to the output of said decoder means.